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Articles de revues sur le sujet « Furnances »

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Auteur : Grafiati
Publié le 26 juillet 2024

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1

Hiramatsu, Mineyuki, et Yasuhiro Takahashi. « Regenerative Burner-combustion-control System for Rehealing Furnances. » DENKI-SEIKO[ELECTRIC FURNACE STEEL] 68, no 3 (1997) : 193–96. http://dx.doi.org/10.4262/denkiseiko.68.193.

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2

Kosenok, V. A., et V. P. Il'chuk. « Requirements on heaters for high-temperature treatment furnances ». Fibre Chemistry 25, no 3 (1993) : 224–26. http://dx.doi.org/10.1007/bf00551139.

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3

Prudenziati, M., L. Moro, B. Morten, F. Sirotti et L. Sardi. « AG-Based Thick-Film Front Metallization of Silicon Solar Cells ». Active and Passive Electronic Components 13, no 3 (1989) : 133–50. http://dx.doi.org/10.1155/1989/27954.

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The evolution of microstructure and electrical properties of silver-based thick-film metallizations of silicon solar cells prepared by infrared firing processes has been investigated. The performance of the cells are shown to be dependent on several dynamical and diffusive phenomena. In particular, the sintering of silver grains, silver diffusion into the glass, and the flow of glass at the metal/silicon interface strongly affect important characteristics of the cells such as sheet and contact resistivities and the adhesion of fingers and bus bars. The existance of an optimum value of the peak firing temperature is observed and explained in terms of competitive phenomena occurring at the metal/silicon interface. Moreover it is shown that IR firing treatments require a careful consideration of the sequence of printing and firing steps. The features of heat treatments performed in conveyor belt furnances using Joule and infrared sources are compared.
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Han, Jun Shu, Zheng Wang, Li Hua Wu, Chao Wu et Wen Chang Zhang. « Design of a Small Medical Waste Pyrolysis Furnance ». Advanced Materials Research 518-523 (mai 2012) : 3590–94. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.3590.

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In this paper, a small medical waste pyrolysis furnance, which could disposal 1t wastes, is designed for the safe disposal of medical wastes, by in-depth research of pyrolysis, detailed calculation analysis, and considering the experimental results and other factors in general. The flue gas treatment system of the small medical waste pyrolysis furnance is designed applying 3T principle, and the dioxin’s later synthesis is controlled, so the dioxin emissions problem is also resolved. The results show that the small furnance has reasonable configuration, works reliably, and it could self-support freely, its emissions meet the national standards for the dioxin emissions 0.213 ng/m3.
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Poenaru, I. O., E. Ardelean, A. Budiul Berghian, M. Magaon et Z. Trisovic. « Research regarding oxygen content reduction in steels ». Journal of Physics : Conference Series 2714, no 1 (1 février 2024) : 012024. http://dx.doi.org/10.1088/1742-6596/2714/1/012024.

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Abstract Actual paperwork reflects obtained results of technological analyse of reducing oxygen content in steel for pipe manufacturing, enterprised in a steel furnance equipped with a triple aggregate EAF-LF-VD. Oxygen content was measured during manufacturing process in Loading Furnance and Vacuum Degasing and has been analysed in comparison with several parameters. The results are presented using Matlab through regression surfaces and correlation equations and highlights the influence of analysed factors on oxygen content variation in steel.
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Ho, J. C., et T. T. Chandratilleke. « Thermodynamic analysis of an electric arc furnance ». Energy Conversion and Management 31, no 2 (janvier 1991) : 179–86. http://dx.doi.org/10.1016/0196-8904(91)90070-y.

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7

Yohana, Eflita, MSK Tony Suryo, Iqbal Ambari, Randa Permana et Novi Laura Indrayani. « Analisis Perpindahan Panas dan Exergi pada Boiler Wanson I Tipe Fire Tube ». ROTASI 20, no 2 (5 juillet 2018) : 78. http://dx.doi.org/10.14710/rotasi.20.2.78-83.

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Boiler terdiri dari vessel yang tertutup pada ujung pangkalnya dan dilengkapi dengan pipa api dan pipa air sebagai media pertukaran kalor dari tinggi ke rendah dan menghasilkan uap bertekanan pada proses selanjutnya untuk memproduksi uap dengan temperature dan tekanan tertentu. Uap yang dihasilkan oleh boiler pada uap saturated digunakan sebagai fluida kerja pemanas dan proses fraksinasi. Tujuan dilakukannya penelitian ini adalah untuk mengetahui besar efisiensi energi dari boiler dan besar laju perpindahan panas yang terjadi pada furnance dari boiler serta mengetahui besar efisiensi exergi dan rugi exergi dari boiler wanson 1 tipe fire tube. Metode penelitian ini adalah analisa secara matematis menggunakan persamaan umum perpindahan panas dan exergi untuk menghitung besar efisiensi dan kerugian exergy. Pada furnance terjadi perpindahan panas secara radiasi sebesar 1942,40 kWatt, konduksi 1942,40 kWatt, konveksi 12448,41 kWatt sementara perpindahan panas yang terjadi pada pipa-pipa api boiler ada sebesar 160,58 kWatt secara radiasi, 160,58 kWatt secara konduksi dan 101.46kWatt. Dari hasil ini diketahui penumpukan kalor terjadi pada proses perpindahan panas secara konveksi. Sementara efisiensi dari boiler berdasarkan perhitungan langsung dan tidak langsung adalah sebesar 70% dan 82%. Sementara dari hasil analisis exergi dihasilkan rugi exergi kombusternya 1148.1627 kJ/s, efisiensi eksergi kombusternya 22.88% kerugian dan efisiensi dari heat exchanger adalah 672.126 kJ/s dan 44.21% sementara kerugian dan efisiensi dari boiler keseluruhan adalah 1820.286 kJ/s dan 13.29%. Dapat disimpulkan bahwa boiler wanson 1 dalam keadaan baik karena memiliki efisien yang masih tinggi yaitu sebesar 70% dan 82% yang dihitung berdasarkan analisa matematis secara langsung dan tidak langsung menggunakan neraca panas namun pada furnance boiler terjadi penumpukan kalor sebesar 59.12 kWatt. Sedangkan analisa exergi didapat efisien dari boiler sebesar13.29%.
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8

Кlimovitsky, M. D. « OPTIMAL METAL HEATING MANAGEMENT IN COMPLEX “FURNANCE-ROLLING-MILL” ». Izvestiya Visshikh Uchebnykh Zavedenii. Chernaya Metallurgiya = Izvestiya. Ferrous Metallurgy 57, no 1 (28 mars 2015) : 56. http://dx.doi.org/10.17073/0368-0797-2014-1-56-58.

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9

Bulakh, V. L., L. G. Sizintseva et E. I. Aksel'rod. « Siliceous articles with improved thermal stability for coke furnance ». Refractories 32, no 3-4 (mars 1991) : 194–97. http://dx.doi.org/10.1007/bf01290488.

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10

(Rob) Stephens, Robert L. « Advancess in furnance integrity—Partly a materials engineering problem ». JOM 57, no 10 (octobre 2005) : 27. http://dx.doi.org/10.1007/s11837-005-0147-5.

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11

Feng, Yun Li, Shuang Li, Jin Zhi Yin et Ming Shan Du. « Effect of Normalizing on Texture and Deep-Drawing Property of 10Cr17 Ferrite Stainless Steel ». Advanced Materials Research 418-420 (décembre 2011) : 125–28. http://dx.doi.org/10.4028/www.scientific.net/amr.418-420.125.

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The microstructure, mechanical properties and texture of 10Cr17 ferritic stainless strips were researched under two processes condition, without normalizing and with normalizing in the cover-type annealing furnance before picking and rolling. The results showed that the texture {111} was strengthed and the texture {001} was weakened of cover anneal’s strip, and high value of r was obtained. Meanwhile, the crimping defect paralleling to rolling direction was uneasy appeared during stretching and the strip show good deep-drawing performance after cover normalizing.
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SUGIMOTO, Kenji, Takayuki UENO et Yoichi TAKATA. « APPLICATION AS TIDAL FLAT SUBSTRATUM MATERIAL BY ELECTRIC FURNANCE SLAG ». Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 74, no 2 (2018) : I_336—I_341. http://dx.doi.org/10.2208/jscejoe.74.i_336.

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13

Zhang, Wen Li, Sui Jing Gao et Ying Na Zhao. « TiO2 Whisker Prepared with Tataniferous Blast-Furnance ». Key Engineering Materials 512-515 (juin 2012) : 191–94. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.191.

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Using titaniferous blast-furnace slag (44-70 wt %), quartz, boric acid, and borax as the main raw materials, composition selecting in the phase-separation region of the Na2O-CaO-Al2O3-B2O3 -SiO2-TiO2 system, the basic glasses were prepared through mixed batches and melted at 1200 oC, then TiO2 whiskers could be achieved by heat-treatment the glass samples. The phase and morphology of samples were analyzed by XRD and SEM. The results indicated: when the composition of samples were selected in the phase-separation region and the ratio of SiO2/ B2O3 was between 1.64-1.87, at 850 °C heat-treatment, the diameter of whiskers was about 0.5μ~1μ and the length-diameter ratio was more than 50.
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14

Sembiring, Sonita Br, et Makmur Sirait. « SINTESIS DAN KARAKTERISASI β-TCP (TRI CALCIUM PHOSPHATE) DARI BATU KAPUR DENGAN METODE HIDROTERMAL ». EINSTEIN 11, no 3 (29 octobre 2023) : 152. http://dx.doi.org/10.24114/eins.v11i3.32176.

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Penelitian ini bertujuan untuk mengetahui hasil sintesis serbuk β-Tri Calcium Phosphate (β-TCP), menentukan gugus fungsi, struktur kristal, morfologi serta ketahanan maksimum serbuk β-TCP dari batu kapur dengan metode hidrotermal. Sintesis β-TCP dari batu kapur diawali dengan penggerusan batu kapur kemudian diayak dan di ballmill. Batu kapur yang telah di ballmill dicuci dengan aquades, lalu di furnance selama 4 jam pada suhu 950oC sehingga menghasilkan CaO. Selanjutnya, CaO diproses menjadi Ca(OH)2 dan Ca(OH)2 diproses menjadi β-TCP dengan melarutkan sebanyak 30 gram Ca(OH)2 kedalam 50 mL etanol dan mencampurkan asam fosfat sebanyak 15,72 mL kedalam 50 mL etanol. Selanjutnya, teteskan larutan asam fosfat dalam etanol ke larutan Ca(OH)2 dalam etanol lalu dipanaskan pada suhu 60oC dengan kecepatan putaran 500 rpm selama 3 jam. Campuran kemudian didiamkan selama 24 jam. Selanjutnya, campuran disaring dan endapan dikeringkan di dalam oven selama 1 jam dengan suhu 100oC, kemudian di furnance pada suhu 800oC selama 2 jam. Hasil karakterisasi XRD β-TCP menunjukkan puncak-puncak difraksi pada sudut 2θ adalah 26.64o, 30.25o, 31.80o, dan 32.92o, dengan struktur kristal hexagonal. Pada karakterisasi SEM-EDX dilihat pada permukaan lapisan powder ini sebaran partikel kurang merata dan hanya terdapat sedikit bongkahan. Pita-pita pada karakterisasi FTIR tersebut menyatakan kehadiran senyawa kalsium fosfat. β-TCP memiliki nilai hardness tester rata-rata 22.54 HRD. Kata Kunci: Batu Kapur, β-Tri Calcium Phosphate (β-TCP),CaO, Hidrotermal
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15

Takeda, Kanji, et F. C. Lockwood. « Integrated Mathematical Model of Pulverised Coal Combustion in a Blast Furnance. » ISIJ International 37, no 5 (1997) : 432–40. http://dx.doi.org/10.2355/isijinternational.37.432.

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16

Gao, Shui Jing, Wen Li Zhang et Gui Qin Hou. « The Study of TiO2 Whiskers Prepared by Melt Phase-Splitting Method and their Photocatalytic Properties ». Advanced Materials Research 287-290 (juillet 2011) : 582–87. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.582.

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This paper studied the preparation of TiO2 whisker with melt phase-splitting method, which used tataniferous blast-furnance as the main raw materrial. XRD and SEM were used to research the phase and morphology of the sample, and by the same time, the photocatalytic properties of TiO2 crystal-beards was tested.The result have shown:the size of TiO2 crystal-beards was sub-micron rank, the crystal type wasβ-TiO2 of orthorhombic high-pressure phase. The generation of TiO2 crystal-beards were effected mainly by the content of Na2O and TiO2, and the heat treatment temperature. The sample had certain photocatalytic properties and the highest photocatalytic efficiency was 56%.
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17

Li, Yong, Xiong Liang, Zhao Dong Wang, Jia Dong Li et Tian Liang Fu. « Study on Three Dimensional Direct Coupling Simulation of Induction Heating for Hot Stamping ». Advanced Materials Research 1063 (décembre 2014) : 280–89. http://dx.doi.org/10.4028/www.scientific.net/amr.1063.280.

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As to the conventional hot stamping furnance’s shortcomings of long heating time, easy oxidized, high energy consumption, the application of induction heating for hot stamping were studied. By using COMSOL Multiphysics software, we calculated the electromagnetic induction field and temperature field by use of the direct coupling (Direct Coupling Method) in the heating process of hot forming sheet and studied the influence of inductor device parameters (such as induction length, distance between inductor and sheet etc.) and various process parameters (such as the power supply frequency, current density, sheet thickness etc.) on heating rate and temperature distribution. That will have a good guidance on the application of induction heating to hot stamping field.
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18

Kaczmarczyk, Grzegorz. « Application of Fluidized Bed Furnance Bottom Ash in Civil Engineering – A Review ». IOP Conference Series : Materials Science and Engineering 1203, no 3 (1 novembre 2021) : 032013. http://dx.doi.org/10.1088/1757-899x/1203/3/032013.

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Abstract For several years there has been widespread and open discussion about climate problems and human responsibility for the generated waste. The number of regulations has led to a search for applications for by-products of combustion. Moreover, the forecasted economic crisis additionally motivates to use every possible material to reduce the cost of manufacturing activities. Efficient waste management is a key element for Polish companies in their efforts to reduce their negative impact on the environment. Fluid combustion of fuels in the Polish power and heat industry still belongs to relatively new technologies. Despite the application of the most technologically advanced processing methods, bottom ashes from fluidized bed boilers are still reluctantly used. The author sees possibilities of using bottom ashes in geotechnical works. The aim of this review is to present the existing source papers relating to the use of bottom ashes in construction processes. A particular area of interest is the use of said ashes in jet-grouting (JG). The paper briefly refers to fluidized bed combustion technology as a source of combustion byproducts. The author pay special attention to the characteristics defining the characteristics of the ashes. The reader's attention will then be drawn to jet-grouting technology. References can be found to the methodology of general cement-soil testing. Due to the nature of the use of JG, the focus is particularly on their strength, water-permeability and frost resistance properties. Due to the need to determine the internal structure of the cement-ground, attention was also paid to the possibility of using X-ray computed tomography for soil cement testing.
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Suzuki, Tohru, Mamoru Miyada, Kiyohisa Ohta, Satoshi Kaneco et Takayuki Mizuno. « Determination of osmium in waste water by graphite furnance atomic absorption spectrometry ». Mikrochimica Acta 129, no 3-4 (septembre 1998) : 259–63. http://dx.doi.org/10.1007/bf01244749.

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20

Shchukin, Yu P., S. I. Trofimov, A. A. Chaplouskii, S. N. Pishnograev et V. P. Gridasov. « Sampling melts of pig iron and slag from a blast-furnance notch ». Metallurgist 44, no 7 (juillet 2000) : 358–59. http://dx.doi.org/10.1007/bf02466200.

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KONDO, Yuki, et Kiyofumi KURUMISAWA. « CHLORIDE ADSORPTION AND DIFFUSIVITY OF BLAST FURNANCE SLAG CEMENT USING CALCIUM NITRITE ». Cement Science and Concrete Technology 76, no 1 (31 mars 2023) : 187–92. http://dx.doi.org/10.14250/cement.76.187.

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22

Valkovic, V., E. Cereda, E. Menapece, G. Moschini et O. Valkovic. « ENVIRONMENTAL AND HUMAN HEALTH IMPACT OF COAL BURNING POWER STATIONS ». International Journal of PIXE 02, no 04 (janvier 1992) : 575–92. http://dx.doi.org/10.1142/s0129083592000622.

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Environmental and health impact of coal burning power plants due to particulate emission is considered. As a result of coal burning large number of toxic elements are released into the atmosphere. The quantity released depends on the particulate control system, furnance design, mineral content of the coal and existing emission control standards. The pathways of toxic elements from coal burning power plants to man as well as dose-response effects could be considered by the applications of PIXE and μ-PIXE as analytical techniques. It is demonstrated that, in addition to concentration levels, information on concentration profiles (surface enrichment) of elements on fly ash particles, having diameter of few micrometers or less is essential.
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Susilowati, Anni, et Serin Ginting. « Pengaruh Penambahan RD 31 pada Beton dengan Substitusi Ground Granulated Blast Furnance Slag ». RekaRacana : Jurnal Teknil Sipil 6, no 3 (25 février 2021) : 191. http://dx.doi.org/10.26760/rekaracana.v6i3.191.

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ABSTRAKJauhnya lokasi batching plant dengan tempat penuangan kerapkali membuat beton setting sehingga dibutuhkan bahan tambah retarder. Ground Granulated Blast Furnace Slag (GGBFS) memiliki komposisi kimia mirip semen. Oleh karena itu, dilakukan penelitian penambahan retarder pada beton dengan substitusi GGBFS sebagai pengganti sebagian semen untuk mengetahui pengaruh (dengan uji regresi SPSS), sifat fisik dan mekanik beton, serta mendapatkan kadar optimum penambahan retarder. Metode penelitian ini menggunakan metode eksperimental dengan variasi campuran 90% semen, 10% GGBFS dengan retarder 0%, 0,2%, 0,4%, dan 0,6% berat semen dengan fas 0,5 sesuai SNI 03-2834-2000. Hasil penelitian menunjukkan retarder 0,2% - 0,6% mampu meningkatkan kuat tekan sebesar 19,61 - 50,59%. Berdasarkan hasil penelitian diperoleh kadar optimum 0,2% karena memiliki sifat paling baik.Kata kunci: GGBFS, kuat tekan, retarder ABSTRACTLong distance between batching plant to the pouring area often causes the concrete undergo a setting, so that a retarder addition material is needed. Ground Granulated Blast Furnace Slag (GGBFS) which has a chemical composition similar to cement. Therefore, a research was conducted on retarder addition to concrete with GGBFS substitution as a partial cement substitute to obtain the effect (regression analysis method in SPSS), physical and mechanical properties of concrete, and to obtain the optimum level of retarder addition. This research used an experimental method with a mixture variation of 90% cement, 10% GGBFS with retarder percentage as follows; 0%, 0.2%, 0.4%, and 0.6% of cement weight with a water/cement is 0.5 according to SNI 03-2834-2000. The results of research with the addition of a retarder of 0.2% - 0.6% were able to increase the compressive strength by 19.61 - 50.59%. Based on the results, the optimum level of retarder is at a variation of 0.2% as it has the best physical and mechanical properties.Keywords: GGBFS, compressive strength, retarder
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NAKATA, Yoshihisa, Torao KEMI, Hajime TAKANO et Tetsu IWASAWA. « CONSIDERATION IN PUMPABILITY OF CONCRETE OF VISCOSITY USING PORTLAND BLAST-FURNANCE SLAG CEMENT ». AIJ Journal of Technology and Design 5, no 8 (1999) : 1–6. http://dx.doi.org/10.3130/aijt.5.1_2.

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Stepanets, Oleksandr, et Yurii Mariiash. « A model predictive controller of the blowing mode during basic oxygen furnance process ». Bulletin of the National Technical University «KhPI» Series : New solutions in modern technologies, no 4 (10) (30 décembre 2021) : 61–66. http://dx.doi.org/10.20998/2413-4295.2021.04.08.

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Today in Ukraine and the world, the problem of energy saving and reducing the cost of smelted steel is state of art. Metallurgical enterprises are developing in conditions of fierce competition, the main reason is that Ukrainian products are extremely energy-intensive due to the depreciation of fixed assets and outdated technological processes. The basic oxygen furnace process is a process of producing steel from liquid cast iron with the addition of steel scrap to the converter and blowing oxygen from above through a water-cooling lance. Nowadays, the production of steel by BOF process is the most popular in the world and is becoming increasingly common. The main disadvantage of the basic oxygen furnace is the need to provide the initial amount of heat (in the form of liquid cast iron) and as a consequence - restrictions on the processing of scrap metal. Reducing the cost of basic oxygen furnace steel is achieved by increasing the share of scrap metal by increasing the degree of afterburning of CO to CO2 in the cavity of the converter, by optimal control of the parameters of the blast mode using model-predictive control. The principle of model-predictive control is based on a mathematical model of the plant. This approach minimizes the functional that characterizes the quality of the process. The linear-quadratic functional was chosen. A forecasting model is proposed taking into account the constraint on changing the position of the lance and the pneumatic oxygen supply valve. It was found that the change in the rate of decarburization of the metal depends on the distance of the lance to the level of the quiet bath and affects the degree of afterburning of CO to CO2. The decarburization process is non-stationary, described by a first-order inertial model, the transfer coefficient and time constant of which depends on the melting period and the duration of the purge. The mathematical model of the blast mode of oxygen-converter melting has been improved, taking into account the influence of the blast intensity on the decarburization process of the bath, which allowed to increase the accuracy and quality of blast control in terms of changing oxygen flow during purging. The simulation results of the automatic control system show that the model-predictive regulator provides the required level of carbon dioxide in the converter gases when the flow rate of oxygen for purge changes.
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Morita, Masahiro, Muneyoshi Yamatani, Tetsuya Nishimoto, Kunio Kawagoe et Hirochika Yamamoto. « The Thermal Characteristics of Silicone Oil by the High Radiative Heat Flux Furnance ». Fire Science and Technology 7, no 1 (1987) : 1_25–1_32. http://dx.doi.org/10.3210/fst.7.1_25.

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Womack, J. B., C. A. Ricard, B. W. Smith et J. D. Winefordner. « Evaluation of a Continuous Flow Furnance Atomizer for Laser Excited Atomic Fluorescence Spectrometry ». Spectroscopy Letters 22, no 10 (décembre 1989) : 1333–45. http://dx.doi.org/10.1080/00387018908054029.

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Wang, L. M., et H. C. Lin. « Mechanical Property and Corrosion Resistance of Ti-15V-3Cr-3Sn-3Al Alloy Weldment with Ti-6Al-4V Filler Following a Gas Tungsten Arc Welding Process ». Applied Mechanics and Materials 58-60 (juin 2011) : 326–31. http://dx.doi.org/10.4028/www.scientific.net/amm.58-60.326.

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In this study TIG welding was carried out in Ti-15V-3Cr-3Al-3Sn alloy by using Ti-6-4 alloy filler. The effect of two common industrial heat treatments (artificial aging treatment at 593°C/2hr /air cooling or a solution treatment at 788°C/30min/air cooling plus aging at 510°C/8hr/furnance cooling) on the microstructure, mechanical property and corrosion resistance of weldment were investigated. It appears that these post weld heat treatment result in enhanced mechanical property as well as its corrosion resistance. In addition, solution plus aging treatment presents the excellent mechanical property and corrosion resistance. TEM investigation is also carried out to observe the nano size precipitates in heat affected zone (HAZ) and fusion zone (FZ). The possible enhanced mechanisms are discussed.
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Arunesh, S., et R. Elangovan. « Partial Replacement of Blast Furnance Slag and Ceramic Tiles for Coarse Aggregate in Concrete ». INTERNATIONAL JOURNAL OF RECENT TRENDS IN ENGINEERING & ; RESEARCH Special Issue 7 (14 mars 2020) : 46–51. http://dx.doi.org/10.23883/ijrter.conf.20200315.008.nq57s.

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Petkovska, Rumenka, Biljana Manevska, Lidija Petrushevska-Tozi et Aneta Dimitrovska. « AAS method for determination of selenium in therapeutical nutritions ». Macedonian Pharmaceutical Bulletin 48 (mars 2003) : 47–52. http://dx.doi.org/10.33320/maced.pharm.bull.2002.48.009.

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An AAS method with graphite furnance and hydride system was developed and validated for determination of selenium in pharmaceutical dosage forms used as therapeutical nutritions. The method was applied for determination of selenium in three therapeutical nutritions after microwave digestion. Acid samples with Pd/Mg nitrate as a modifier were used for graphite furnace and acid samples with sodium borhydride alkaline solution for hydride system. Validation of applied method was carried out by determination of linearity (in concentration range from 15 to 75 µg/l for graphite furnace technique and from 5 to 25 µg/l for hydride system) as well as accuracy, precision, detection and quantification limit. The results obtained have shown that the proposed AAS method with graphite furnace and hydride system for determination of selenium in therapeutical preparations are sensitive, accurate and reproducible.
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SINGH, PREET M., VIKAS R. BEHRANI et JAMSHAD MAHMOOD. « Corrosion of Carbon Steel Tubes in the Mid-Furnance of Kraft Recovery Boilers--Environmental Characterization ». April 2009 8, no 4 (1 mai 2009) : 23–29. http://dx.doi.org/10.32964/tj8.4.23.

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Carbon steel tubes in the mid-furnace of kraft recovery boilers have experienced accelerated corro-sion in recent years. Gaseous environments in the mid-furnace of kraft recovery boilers were generally considered to be oxidizing and not very corrosive to the carbon steel waterwall tubes. However, mid-furnace corrosion has occurred above the cut line where composite tubes that have a stainless steel outer layer used in the lower furnace are welded to the carbon steel waterwall section. This study characterized the local environments in three boilers to find the reasons for accelerated corrosion of waterwalls in the mid-furnace. Gas sampling ports were installed in the mid-furnace with high and low corrosion rates of carbon steel waterwall tubes. During boiler operation, gases were sampled and analyzed using a specially designed gas chromatograph. In each boiler, the areas with higher corrosion rates had higher concentrations of reducing gases and sulfur-containing gases at the waterwall surface than in the low-corrosion areas. Results from this study indicate that accelerated mid-furnace corrosion likely results from changes in the boiler operation, such as decreases in the air supply at the lower air port levels of the furnace. These changes also might result in higher local gas temperatures and local thermal cycling in the mid-furnace of boilers.
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Gavrilyuk, G. G., R. R. Syrtlanov, N. A. Karpova et S. V. Shavrin. « Features of operation of the central trough of a blast furnance smelting vanadium pig iron ». Metallurgist 44, no 8 (août 2000) : 392–94. http://dx.doi.org/10.1007/bf02466139.

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Rozmus, Dmytro, Khrystyna Sobol, Nadiya Petrovska et Volodymyr Hidei. « RESEARCH ON THE STRUCTURE FORMATION PROCESSES IN THE SYSTEM «BLAST FURNANCE SLAG - WASTEPAPER SLUDGE ASH» ». Theory and Building Practice 2024, no 1 (20 juin 2024) : 80–85. http://dx.doi.org/10.23939/jtbp2024.01.080.

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Concrete production is one of the largest consumers of natural non-metallic materials. To mitigate the environmental impact associated with cement production The use of wastepaper sludge ash (WSA) from paper recycling is a new promising direction for saving fuel, energy, and natural resources in cement and concrete production, aimed at reducing the proportion of clinker in cement by replacing part of the cement with supplementary cementitious materials. This approach aligns with the priority principles of uniform and sustainable industry development aimed at creating environmentally friendly, low-energy-consuming technologies. This study is dedicated to investigating the properties of composite systems with different proportions of blast furnace granulated slag and wastepaper sludge ash. Test results show that samples with 70% WSA achieve the highest early strength (2.23 MPa flexural, 7.6 MPa compressive). Later, samples with a 70:30 BFS:TAW ratio exhibit the highest strength (38.3 MPa compressive, 4.6 MPa flexural) due to predominant hydro silicate hydration. The composite system forms CSH(B) hydro silicates and calcium hydro aluminate C4AH13, reacting with WSA gypsum to form calcium hydro sulpho aluminate C3A∙3CaSO4∙32H2O during initial hydration.
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Abdellaoui, K. « Optical Properties of Lithium Borate Glass Containing Barite ». Defect and Diffusion Forum 406 (janvier 2021) : 441–47. http://dx.doi.org/10.4028/www.scientific.net/ddf.406.441.

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Through this research we have prepared samples of glass, which includes 60 mol%B2O3 – x mol %barite – (40-x) mol %Li2O, where x= 5, 7.5, 10, and 15 mol%. The samples fabricated by the melt quenching technique. The samples are melted in alumina crucible at 1473 K for 1.5 h in an electric muffle furnace (LENTON). The glasses were casted into stainless molds, and then immediately transferred to an annealing furnance at about 400°C. The aim of this work is to determine the extent of the effect of raw barite on the physical and optical properties of this glass. The optical transmittance and reflectance spectrum of the glasses in this work were determined in the wavelength range 300–2500 nm at room temperature. The physical and optical properties of the following prepared glass samples have been determined and calculated (density, volume molar, refraction index, Optical dielectric constant, molar refractivity and electronic polarizability) for glasses prepared.
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35

Yang, Yi Bo, Mei Ru Zheng, Wen Ying Guo et Heng Chang Wang. « Experimental Research on the Durability of Inorganic Binder Stabilized Material with Soda Residue ». Key Engineering Materials 629-630 (octobre 2014) : 189–94. http://dx.doi.org/10.4028/www.scientific.net/kem.629-630.189.

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The high contents of alkali ion and chloride ion in soda residue pollute environment. So how to treat the soda residue is an urgent problem to be solved in China. The soda residue can be used in inorganic binder stabilized materials. But the negative effect of soda residue is not studied. The impermeability, frost resistance, and chloride ion leaching of inorganic binder stabilize materials prepared by soda residue are studied. And the results as followings: (1) The permeability coefficients of cement/ mineral admixture-soda residue stabilized stone chip are very low, and they are good impermeable materials; (2) The frost resistance of cement-silica fume-soda residue stabilized stone chip is good, and silica fume is recommended to be used in cold area; (3) The mineral admixture has a better long-term immobilized effect on chloride ion than cement, and the ground granular blast-furnance slag is the best mineral admixture to immobilize the chloride ion.
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Guo, Wen Ying, Mei Ru Zheng, Yi Bo Yang et Heng Chang Wang. « Research on the Proportion of Inorganic Binder Stabilize Materials with Soda Residue ». Key Engineering Materials 629-630 (octobre 2014) : 481–86. http://dx.doi.org/10.4028/www.scientific.net/kem.629-630.481.

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The soda residue pollutes the environment because of high contents of alkali ion and choleric ion in it. So how to treat the soda residue is an urgent problem to be solved. The mineral admixtures are added in traditional inorganic binder to improve the strength performance of inorganic binder stabilized materials and decrease the negative effect of soda residue is studied. And the results as followings: (1) Soda residue has different activated effect on mineral admixture; (2) Mineral admixture replace the cement with same dosage can improve the unconfined compressive strength greatly to meet the requirement of standard; (3) The choleric ion leaching rates of cement-mineral admixture-soda residue stabilized stone chip decrease with time. Mineral admixture has a better immobilization effect on the chloride ion except fly ash before 90d; (4) Ground granular blast-furnance slag is the best material to improve the strength performance of inorganic binder stabilized materials and decreases the negative effect of soda residue.
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37

Abdellaoui, K. « Optical Properties of Lithium Borate Glass Containing Barite ». Defect and Diffusion Forum 406 (janvier 2021) : 441–47. http://dx.doi.org/10.4028/www.scientific.net/ddf.406.441.

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Through this research we have prepared samples of glass, which includes 60 mol%B2O3 – x mol %barite – (40-x) mol %Li2O, where x= 5, 7.5, 10, and 15 mol%. The samples fabricated by the melt quenching technique. The samples are melted in alumina crucible at 1473 K for 1.5 h in an electric muffle furnace (LENTON). The glasses were casted into stainless molds, and then immediately transferred to an annealing furnance at about 400°C. The aim of this work is to determine the extent of the effect of raw barite on the physical and optical properties of this glass. The optical transmittance and reflectance spectrum of the glasses in this work were determined in the wavelength range 300–2500 nm at room temperature. The physical and optical properties of the following prepared glass samples have been determined and calculated (density, volume molar, refraction index, Optical dielectric constant, molar refractivity and electronic polarizability) for glasses prepared.
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38

Tanaka, Koji, Minoru Mori et Yoichi Ishida. « Weak-beam electron microscopy of Σ =3 incoherent twin boundary in SUS316 austenitic stainless steel ». Proceedings, annual meeting, Electron Microscopy Society of America 48, no 4 (août 1990) : 360–61. http://dx.doi.org/10.1017/s042482010017493x.

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Weak beam (α-fringe) electron microscopy allows one to determine the Burgers vector of a grain boundary dislocation unambiguously. The rigid body translation or excess volume atomic displacements at the boundary between two ajacent crystals may be measured 3 — dimentionally by this method.The specimen was commercial austenitic stainless steel SUS316, which was cold rolled to sheet specimen of about 0.2mm in thickness, annealed at 950°C for 2hr, and was furnance cooled to introduce annealing twins. The annealed specimen was polished electrically in 90% acetic acid and 10% perchloric acid solution at ice water temperature. The polished specimens were observed in a JEM-1250 high voltage electron microscope at 1000keV. The weak beam α-fringe changes only monotonously with displacement at weak beam common diffraction conditions. The translation term R is measured directly from the relative displacement of the extinction contour Δn at the interface. By the standard dynamical theory, the following equation can be derived:
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39

Donawa, Wendy. « Poetry and process : Glad in the Ruthless Furnance / Poésie et procédé : être joyeux dans l’impitoyable fournaise ». Canadian Review of Art Education / Revue canadienne d’éducation artistique 45, no 1 (22 décembre 2018) : 12–22. http://dx.doi.org/10.26443/crae.v45i1.47.

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Abstract: Poets use sensory imagery and perception, memory and experience, free association and contemplation to join psychic and material worlds, and to honour both emotional and discursive truths. Through multiple drafts, free-writing and research, the author unpacks her own reflections and poems to demonstrate the process by which intuition and personal insight are crafted for public understanding. This poetic process suggests that scholarly discourses of the arts and the humanities need not always fall into the quantitative/qualitative binary, but that both heart and mind are required to some degree in the seeking of wisdom.Keywords: imagery, craft, metaphor, cadence, tone, sensory perception, memory, intuition, contemplationRésumé : Les poètes utilisent l’imagerie sensorielle et la perception, la mémoire et l’expérience ainsi que l’association libre et la contemplation, pour unifier les univers psychique et matériel et célébrer à la fois les vérités émotionnelles et discursives. Par le biais de multiples ébauches, d’écriture libre et de recherches, l’auteure partage ses réflexions et poèmes pour décrire le procédé par lequel intuition et points de vue personnels sont façonnés dans le but d’être compris par le public. Ce procédé poétique donne à penser que les discours érudits sur les arts et les sciences humaines ne doivent pas obligatoirement être de nature binaire quantitative ou qualitative mais que cœur et esprit sont, dans une certaine mesure, indispensables à la quête de la sagesse. Mots-clés : imagerie, art, métaphore, cadence, ton, perception sensorielle, mémoire, intuition, contemplation.
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Koskinen, T., et H. Torvela. « Energy balance and operation equations of a copper flash smelting furnance based on the superposition principle ». Minerals Engineering 2, no 4 (janvier 1989) : 489–500. http://dx.doi.org/10.1016/0892-6875(89)90084-8.

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Mariiash, Yu I., et O. V. Stepanets. « COMBINED FEEDFORWARD AND FEEDBACK CONTROL OF PARAMETERS OF THE BLOWING MODE OF THE BASIC OXYGEN FURNANCE ». Scientific notes of Taurida National V.I. Vernadsky University. Series : Technical Sciences 1, no 1 (2024) : 223–30. http://dx.doi.org/10.32782/2663-5941/2024.1.1/34.

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FAUZI, AKBAR. « PENURUNAN KADAR AMONIA DENGAN MENGGUNAKAN ARANG AKTIF AMPAS KOPI ». CHEMTAG Journal of Chemical Engineering 1, no 2 (26 septembre 2020) : 52. http://dx.doi.org/10.56444/cjce.v1i2.1671.

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<p><em>Salah satu alternatif pengolahan </em><em>amonia</em><em> adalah dengan metode adsorpsi dengan menggunakan adsorben salah satunya adsorben arang aktif ampas kopi. Tujuan penelitian ini untuk menghasilkan adsorben ampas kopi untuk menurunkan kadar amonia yang mempunyai %yield sebesar 56%. Arang aktif dibuat dengan cara merendam ampas kopi dalam larutan HCl 0.1M selama 48jam. Karbon aktif dibakar dalam muffle furnance pada suhu 600°C. Karbon aktif diuji karakteristik yang terdiri dari uji kadar air, kadar abu, daya serap terhadap iodium dan lolos mesh. Waktu kontak dan berat adsorben ampas kopi yang optimal ditentukan untuk mendapatkan adsorbsi amonia dalam air limbah tahu. Variasi waktu kontak 30, 60, 90, 120 menit dan variasi berat adsoben 0.2, 0.4, 0.6, 0.8 gram. Dari hasil pengamatan, maka dapat disimpulkan bahwa kondisi optimum penurunan kadar amonia pada waktu 120 menit dengan berat adsorben sebanyak 0.8gram menghasilkan %yield sebesar 97.3%.</em><em></em></p>
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43

Abdillah, Abdillah, Gimelliya Saragih, Muhammad Zaim Akbari et Vivi Purwandari. « PEMBUATAN PENYERAP GAS BUANG KENDARAAN BERMOTOR BERBASIS LIMBAH PADAT KELAPA SAWIT ». JURNAL KIMIA SAINTEK DAN PENDIDIKAN 7, no 1 (14 juin 2023) : 21–26. http://dx.doi.org/10.51544/kimia.v7i1.3904.

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Polusi udara merupakan masalah yang dihadapi di masa sekarang, kendaraan bermotor menyumbang 70% Polusi udara yang ada di Indonesia. Membran Keramik sebagai penyerap emisi karbon dengan nanokarbon sebagai filler digunakan untuk menyerap gas buang yang dihasilkan oleh kendaraan bermotor. Penelitian ini bertujuan untuk membantu pemerintah dalam mengatasi polusi udara dengan memanfaatkan limbah padat kelapa sawit. Tanah liat sebagai matriks di aktivasi menggunakan KOH, serbuk pelepah sawit sebagai pembentuk pori dan menggunakan nanokarbon sebagai filler yang berasal dari cangkang sawit yang dibuat melalui metode hidrotermal dengan 180oC selama 6 jam dengan pelarut air dengan perbandingan 80:15:5. Campuran di hotpress dengan suhu 120oC dilanjutkan dengan proses furnance dengan suhu 600oC selama 1 jam. menghasilkan kekuatan tarik sebesar 6.475 Mpa. Hasil analisa FTIR membran keramik berpori menunjukan adanya gugus fungsi bahan baku pembentuk membran keramik dan dari hasil analisa DSC membran keramik menunjukan bahwa kemampuan termal penggunaan membran keramik dapat digunakan dibawah temperatur 470oC. Hasil uji data filtrasi (emisi gas buang) pada keramik berpori yang dihasilkan dapat di lihat CO terserap 3,20%, CO2 terserap 5.6% dan HC terserap 418 ppm.
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Sembiring, Chafiz Husin, Miftahul Husnah et Ratni Sirait. « PREPARASI KARBON AKTIF LIMBAH KULIT UBI KAYU MENGGUNAKAN AKTIVASI NAOH BERBANTUAN GELOMBANG MIKRO ». JOURNAL ONLINE OF PHYSICS 8, no 3 (31 juillet 2023) : 33–38. http://dx.doi.org/10.22437/jop.v8i3.20125.

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Penelitian ini bertujuan Untuk mengetahui pengaruh konsentrasi NaOH sebagai aktivator berbantuan gelombang mikro terhadap sifat fisis, luas permukaan dan gugus fungsi karbon aktif dari limbah kulit ubi kayu.Karbonisasi dilakukanmenggunakan furnance pada temperatur 500oC selama 1 jam.Aktivasi karbon menggunakan larutan NaOH dengan variasi konsentrasi 2,0%, 2,5% dan 3%. Iradiasi menggunakan microwave dengan daya 630 Watt selama 20 menit. Analisis yang dilakukan meliputi uji kadar air, kadar abu, kadar zat menguap, kadar karbon, luas permukaan menggunakan UV-Vis dan gugus fungsi menggunakan FTIR. Hasil penelitian ini menunjukkan bahwa Konsentrasi NaOH mempengaruhi beberapa karakteristik arang aktif yang dihasilkan dari kulit ubi.Konsentrasi NaOH 3% menghasilkan arang aktif dengan karakter terbaik, dengan kadar air sebesar 6,93%, kadar zat mudah menguap sebesar 21,89%, kadar abu total sebesar 9,39%, kadar karbon sebesar 68,71%. Analisis luas permukaan menunjukkan bahwa variasi konsentrasi NaOH berpengaruh terhadap luas permukaan dengan nilai berturut-turut 34,0605 m2/g, 34,6276 m2/g, 34,6590 m2/g. Pengujian gugus fungsi menunjukkan adanya gugus fungsi OH hydroxyl, C=C aromatic, C-O carboxyl acid, C-H alkana, C-H aromatic, N-H amina, dan OH alcohols.
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Zhou, Zhenyu, et Cong Luo. « Dynamic Study on Vanadium Extraction Process in Basic Oxygen Furnance : Modeling Based on Gibbs’ Free Energy Minimization ». Metals 12, no 4 (2 avril 2022) : 612. http://dx.doi.org/10.3390/met12040612.

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Vanadium extraction process demands low residual vanadium and carbon loss, and variations of dissolved elements in hot metal must be determined to achieve it. A three parts dynamic model that applies the concept of Gibbs’ free energy minimization at the slag–metal interface is proposed. Modeling simulation results shows good uniformity with plant experimental data, and the presented model can describe the vanadium extraction process in BOF qualitatively well. The effects of coolant addition and oxygen flow rate have been studied by modeling. The lack of coolant will reduce (FeO) content and elevate the molten bath temperature, which are harmful to deep vanadium removal with less carbon loss in semi-steel. The excessive oxygen flow rate has little effect on residual [V], and there is more carbon loss because of higher (FeO) content and molten bath temperature.
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FUJIWARA, Hiromi, Takashi YOKOMURO, Kiyoshi KOIBUCHI et Kunihiro OYAMADA. « STUDY ON CRACK RESISTANCE OF CONCRETE USING A NEW BLAST FURNANCE CEMENT TYPE A WITH LOW SHRINKAGE ». Cement Science and Concrete Technology 64, no 1 (2010) : 265–71. http://dx.doi.org/10.14250/cement.64.265.

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AR, Dewita, et Nurdin Siregar. « Karakterisasi Nano Partikel Zeolit Alam Sebagai Filler Aluminium Dengan Menggunakan Metode Kopresipitasi ». EINSTEIN 10, no 1 (28 février 2022) : 54. http://dx.doi.org/10.24114/einstein.v10i1.27275.

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Sintesis dan karakterisasi nano partikel zeolit bertujuan untuk mengetahui hubungan antara variasi suhu pembakaran terhadap struktur morfologi, bentuk kristalnya, fasa yang terbentuk serta kekerasan campuran antara nanozeolit terbaik dengan alumunium. Zeolit kemudian dibakar didalam furnance selama 2 jam dengan suhu divariasikan 3500C, 4500C, 5500C, dan 6500C. Zeolit kemudian dimilling selama 2 jam dengan putaran 400 rpm dan diayak dengan ayakan 200 mesh sehingga menghasilkan powder zeolit. Nano zeolit disintesis menggunakan metode kopresipitasi dengan larutan HCL 1 M dan NaOH 1 M. Sedangkan metode pencampuran nanozeolit dengan aluminium dilakukan metode metalurgi serbuk. Sedangkan metode pencampuran nanozeolit dengan alumunium dilakukan metode metalurgi serbuk. Hasil X-Ray Diffraction (XRD) ke empat sampel memiliki panjang gelombang sebesar 1.540600 Å dengan parameter kisi a dan c. Ukuran partikel pada suhu 3500C sebesar 65,77 nm, pada suhu 4500C sebesar 69,08 nm, dan pada suhu 5500C sebesar 69,08 nm, sedangkan pada suhu 6500C sebesar 53, 32 nm. Dengan persamaan Scherer diperoleh ukuran kristal rata-rata zeolit adalah 74 nm. Dari analisis SEM, diperoleh keempat morfologi nanozeolit menunjukkan butiran yang kurang rapat. Dari hasil pengujian kekerasan alumunium dengan nanozeolit menunjukakan nilai kekerasan maksimum 81,6 kgf/mm.
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Du, Na, Hongting Ma, Xiaochen Yang, Kun Yang et Qingxin Zhao. « Investigation on the heat transfer and product characteristics of waste PCB recycled by a novel pilot-scale pyrolysis furnance ». Process Safety and Environmental Protection 160 (avril 2022) : 910–20. http://dx.doi.org/10.1016/j.psep.2022.03.004.

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MIYAMOTO, Yoshiaki, et Yasuhiro YAMAMOTO. « STUDY ON THE FLUIDITY AND PROPERTIES OF HIGH-FLUIDITY CONCRETE USING PORTLAND BLAST-FURNANCE SLAG CEMENT AND FLY ASH ». Journal of Structural and Construction Engineering (Transactions of AIJ) 69, no 577 (2004) : 1–7. http://dx.doi.org/10.3130/aijs.69.1_3.

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Laili, Nur. « Pengaruh pemanasan terhadap sifat-sifat fisika tanah gambut ». Jurnal POLIMESIN 7, no 1 (1 février 2009) : 595. http://dx.doi.org/10.30811/jp.v7i1.1347.

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Tanah gambut di Indonesia seluruhnya ditaksir mencapai 16-27,7 juta ha yang tersebar sebagian besar di kepulauan Sumatera, Kalimantan, Jawa/bali, Maluku/Nusa Tenggara dan Irian Jaya. Tanah gambut di Indonesia umumnya mendominasi wilayah sepanjang pantai, serta belum ada diperoleh data yang jelas mengenai jumlah luas tanah gambut atas dasar bahan asal, cara pembentukan, jenis pelapukan dan ketebalan bahan organiknya. Metode penelitian yang dilakukan adalah metode pemanasan sample tanah dalam muffle furnance selama 1 jam dengan temperature 25” (control), 175"C (Dehidrasi sempurna dari sample), 325”C (Dehidrasi dari bentuk gel0, 475 (Pembakaran bahan organic). Hasil dari pemanasan ini dimasukkan dalam analisa Statistik rancangan acak lengkak (RAL). Hasil penelitian menunjukkan bahwa warna tanah hitam menjadi hitam mereahan pada pemanasan 475"C, porositas tanahnya sebesar 93,71”6 sehingga porositas tanah gambut yang besar akan memberikan peluang air untuk lolos besar. Kerapatan lindaknya memberikan pengaruh yang nyata berdasarkan analisa sidik ragam suhu semakin tinggi, kerapatan lindak yang diperoleh nilainya semakin kecil sekitar 0,09 gr/cm' pada suhu 475'C. Kandungan C- organik tanahnya memberikan pengaruh yang nyata pada pemanasan 475"C sebesar 5,5096 yaitu tanah mengalami penurunan yang sangat besar saat pembakaran bahan dan kemasaman tanahnya, semakin tinggi suhu yang diberikan maka Ph tanah tinggi dan tingkat kemasaman tanah rendah.Kata kunci : Tanah gambut, warna tanah, kerapatan lindak, porositas tanah, C-organik tanah, PH.
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