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Journal articles on the topic 'Mineral slurries'

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Published: 4 June 2021

Last updated: 7 February 2022

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1

Muster, T. H., and C. A. Prestidge. "Rheological investigations of sulphide mineral slurries." Minerals Engineering 8, no. 12 (December 1995): 1541–55. http://dx.doi.org/10.1016/0892-6875(95)00117-4.

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2

Gopalakrishnan, S., A. S. Mujumdar, M. E. Weber, and P. M. Pirkonen. "Electrokinetically enhanced vacuum dewatering of mineral slurries." Filtration & Separation 33, no. 10 (November 1996): 929–32. http://dx.doi.org/10.1016/s0015-1882(97)84252-8.

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3

Kongas, Matti, Kari Saloheimo, Heikki Pekkarinen, and Janne Turunen. "New Particle Size Analysis System for Mineral Slurries." IFAC Proceedings Volumes 36, no. 24 (October 2003): 309–14. http://dx.doi.org/10.1016/s1474-6670(17)37648-6.

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4

Purnell, P., O. J. Francis, and C. L. Page. "Formation of thaumasite in synthetic cement mineral slurries." Cement and Concrete Composites 25, no. 8 (December 2003): 857–60. http://dx.doi.org/10.1016/s0958-9465(03)00112-4.

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5

Heiskanen, Kari. "New Wet Classification Hydrocyclones for Fine Mineral Slurries." KONA Powder and Particle Journal 9 (1991): 139–48. http://dx.doi.org/10.14356/kona.1991020.

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6

Schweigler, N., and W. Stahl. "High performance disc filter for dewatering mineral slurries." Filtration & Separation 27, no. 1 (January 1990): 38–41. http://dx.doi.org/10.1016/0015-1882(90)80296-w.

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7

Haavisto, Olli, and Heikki Hyötyniemi. "Reflectance Spectroscopy in the Analysis of Mineral Flotation Slurries." IFAC Proceedings Volumes 42, no. 23 (2009): 140–45. http://dx.doi.org/10.3182/20091014-3-cl-4011.00026.

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8

Haavisto, Olli, and Heikki Hyötyniemi. "Reflectance spectroscopy in the analysis of mineral flotation slurries." Journal of Process Control 21, no. 2 (February 2011): 246–53. http://dx.doi.org/10.1016/j.jprocont.2010.10.015.

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9

Coghill, P. J., M. J. Millen, and B. D. Sowerby. "On-line measurement of particle size in mineral slurries." Minerals Engineering 15, no. 1-2 (January 2002): 83–90. http://dx.doi.org/10.1016/s0892-6875(01)00206-0.

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10

Joseph Soly, Sophia, Ataollah Nosrati, William Skinner, and Jonas Addai-Mensah. "Superabsorbent-mediated dewaterability of fine hydrophobic sulphide mineral slurries." Separation Science and Technology 54, no. 18 (January 21, 2019): 3055–69. http://dx.doi.org/10.1080/01496395.2019.1565771.

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11

Mikhlin, Yuri. "X-ray Photoelectron Spectroscopy in Mineral Processing Studies." Applied Sciences 10, no. 15 (July 26, 2020): 5138. http://dx.doi.org/10.3390/app10155138.

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Surface phenomena play the crucial role in the behavior of sulfide minerals in mineral processing of base and precious metal ores, including flotation, leaching, and environmental concerns. X-ray photoelectron spectroscopy (XPS) is the main experimental technique for surface characterization at present. However, there exist a number of problems related with complex composition of natural mineral systems, and instability of surface species and mineral/aqueous phase interfaces in the spectrometer vacuum. This overview describes contemporary XPS methods in terms of categorization and quantitative analysis of oxidation products, adsorbates and non-stoichiometric layers of sulfide phases, depth and lateral spatial resolution for minerals and ores under conditions related to mineral processing and hydrometallurgy. Specific practices allowing to preserve volatile species, e.g., elemental sulfur, polysulfide anions and flotation collectors, as well as solid/liquid interfaces are surveyed; in particular, the prospects of ambient pressure XPS and cryo-XPS of fast-frozen wet mineral pastes are discussed. It is also emphasized that further insights into the surface characteristics of individual minerals in technological slurries need new protocols of sample preparation in conjunction with high spatial resolution photoelectron spectroscopy that is still unavailable or unutilized in practice.

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12

Jones, Gavin, Robert P. van Hille, and Susan T. L. Harrison. "Sulfide Mineral Induced Oxidative Stress as a Limiting Factor in Tank Bioleaching Performance." Advanced Materials Research 71-73 (May 2009): 365–68. http://dx.doi.org/10.4028/www.scientific.net/amr.71-73.365.

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In tank bioleaching, decreasing particle size of milled concentrates has been shown to improve leaching performance owing to increased mineral surface area and mechanical activation effects of fine mineral particles. However, evidence suggests a critical lower limit of particle size distribution exists below which the performance of the thermophilic iron and sulfur oxidizer Sulfolobus metallicus is compromised and complete culture death may result. This paper proposes an explanation for these observations at fine fractions through identifying a relationship between mineral composition of six sulfide concentrates, their extent of milling and the generation of the reactive oxygen species (ROS) hydrogen peroxide (H2O2) and hydroxyl radicals (•OH) in slurries. The effect of oxidative stress induced in the absence of minerals on growth and bioleaching performance of S. metallicus is studied.

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13

Velthof, G. L., and R. P. J. J. Rietra. "Nitrogen Use Efficiency and Gaseous Nitrogen Losses from the Concentrated Liquid Fraction of Pig Slurries." International Journal of Agronomy 2019 (May 2, 2019): 1–10. http://dx.doi.org/10.1155/2019/9283106.

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Processed manure can be an alternative source of nutrients for untreated manure and mineral fertilizers. Mineral concentrates (MCs) are derived from reversed osmosis of the liquid fraction of separated pig slurries. The emissions of ammonia (NH3) and nitrous oxide (N2O) from different (processed) manures and fertilizers were tested in an incubation experiment and a greenhouse experiment with grass as a test crop. Dry matter yields and nitrogen (N) uptake were also determined in the greenhouse experiment. Incorporation into the soil decreased on NH3 emission but increased N2O emission for all nitrogen products (mineral fertilizer, untreated slurry, MC, and solid fraction of separated slurry). Incorporation of both MC, slurries, and mineral fertilizers increased N2O emission in the incubation experiment. The lowest apparent N recovery (ANR) in the pot experiment with grass was obtained for incorporated pig slurry (30–39%) and surface-applied MC (33–38%), while the highest ANRs were obtained for liquid ammonium nitrate (45–53%) and acidified MC (43–55%). It is concluded that MCs have a similar N fertilizer value as mineral N fertilizers if NH3 emission is reduced by incorporation or acidification.

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14

Turian, R. M., T. W. Ma, F. L. G. Hsu, and D. J. Sung. "Characterization, settling, and rheology of concentrated fine particulate mineral slurries." Powder Technology 93, no. 3 (October 1997): 219–33. http://dx.doi.org/10.1016/s0032-5910(97)03274-9.

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15

NGUYEN, Q. D., C. DEVASAGAYAM, and D. J. BOWN. "Development of an On-line Flow Rheometer for Mineral Slurries." Mineral Processing and Extractive Metallurgy Review 20, no. 1 (January 2000): 75–91. http://dx.doi.org/10.1080/08827509908962464.

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16

SLATTER, PAUL. "The Role of Rheology in the Pipelining of Mineral Slurries." Mineral Processing and Extractive Metallurgy Review 20, no. 1 (January 2000): 281–300. http://dx.doi.org/10.1080/08827509908962478.

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17

Souza Pinto, T. C., D. Moraes Junior, P. T. Slatter, and L. S. Leal Filho. "Modelling the critical velocity for heterogeneous flow of mineral slurries." International Journal of Multiphase Flow 65 (October 2014): 31–37. http://dx.doi.org/10.1016/j.ijmultiphaseflow.2014.05.013.

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18

Ricko, Allison N., Andrew W. Psoras, and John D. Sivey. "Reductive transformations of dichloroacetamide safeners: effects of agrochemical co-formulants and iron oxide + manganese oxide binary-mineral systems." Environmental Science: Processes & Impacts 22, no. 10 (2020): 2104–16. http://dx.doi.org/10.1039/d0em00331j.

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19

Lv, Yiyan, Wei Zhu, and Tingting Han. "Mechanism Underlying Bonding Water Film Effect on Rheological Parameters." Advances in Materials Science and Engineering 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/8451391.

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From experiments on bonding water of different slurries and the analysis of flow curves, the bilinear fluid model has been improved. The results showed that the rheological parameters correspond to physical processes at different stages of shear strain. As shear rate increases, slurries evolve from high-viscosity Bingham fluids to low-viscosity Bingham fluids. Specific surface area determines the number of edge-to-face arrangements; mineral composition influences the binding strength of each edge-to-face arrangement; and the volume fraction of particles regulates the distance between clay particles and number of edge-to-face arrangements.

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20

Ndlovu, Bulelwa, Megan Becker, Elizaveta Forbes, David Deglon, and Jean-Paul Franzidis. "The influence of phyllosilicate mineralogy on the rheology of mineral slurries." Minerals Engineering 24, no. 12 (October 2011): 1314–22. http://dx.doi.org/10.1016/j.mineng.2011.05.008.

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21

PÉREZ, R. G., R. H. ESTRADA, A. S. URIBE, and F. A. NAVA. "AUTOMATED TECHNIQUE TO ESTIMATE THE VOLUME PARTICLE DIAMETER IN MINERAL SLURRIES." Canadian Metallurgical Quarterly 43, no. 4 (January 2004): 467–74. http://dx.doi.org/10.1179/cmq.2004.43.4.467.

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22

Kotzé, Reinhardt, Rainer Haldenwang, and Paul Slatter. "Rheological Characterization of Highly Concentrated Mineral Suspensions Using Ultrasound Velocity Profiling with Combined Pressure Difference Method." Applied Rheology 18, no. 6 (December 1, 2008): 62114–1. http://dx.doi.org/10.1515/arh-2008-0020.

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Abstract The rheological behaviour of non-Newtonian, highly concentrated and non-transparent fluids used in industry have so far been analysed using commercially available instruments, such as conventional rotational rheometers and tube viscometers. When dealing with the prediction of non-Newtonian flows in pipes, pipe fittings and open channels, most of the models used are empirical in nature. The fact that the fluids or slurries that are used normally are opaque, effectively narrows down the variety of applicable in-line rheometers even further, as these instruments are normally based on laser or visible light techniques, such as Laser Doppler Anemometry. In this research, an Ultrasonic Velocity Profiling technique (UVP), in combination with a pressure difference (PD) measurement, was tested to provide in-line measurement of rheological parameters. The main objective of this research was to evaluate the capabilities of the UVP-PD technique for rheological characterisation of different concentrations of non-transparent non-Newtonian slurries. Kaolin, bentonite, Carboxymethyl Cellulose (CMC) and water solutions were used as model non-Newtonian mining slurries. Results determined by the UVP-PD method were compared with results obtained by off-line rheometry and in-line tube viscometry. The agreement between the UVP-PD method, tube viscometry and conventional rheometry was found to be within 15 % for all of the highly concentrated mineral suspensions investigated over a given range of shear rates. This method, if used in combination with a pressure difference technique (PD), has been found to have a significant potential in the development process of new in-line rheometers for process control within the mining industry.

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23

Khajehzadeh, Navid, Olli Haavisto, and Lauri Koresaar. "On-stream and quantitative mineral identification of tailing slurries using LIBS technique." Minerals Engineering 98 (November 2016): 101–9. http://dx.doi.org/10.1016/j.mineng.2016.08.002.

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24

Hu, X. "The use of polypropylene fibre needlefelt in the filtration of mineral slurries." International Journal of Multiphase Flow 22 (December 1996): 108. http://dx.doi.org/10.1016/s0301-9322(97)88249-3.

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25

Lim, Sanghyuk, Kyung Hyun Ahn, Seung Jong Lee, Ashish Kumar, Nicky Duan, Xiaodan Sun, Shane P. Usher, and Peter J. Scales. "Yield and flow measurement of fine and coarse binary particulate mineral slurries." International Journal of Mineral Processing 119 (March 2013): 6–15. http://dx.doi.org/10.1016/j.minpro.2012.12.009.

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26

Wu, Dongling, Wei Chen, Damian Glowinski, and Craig Wheeler. "Modelling mineral slurries using coupled discrete element method and smoothed particle hydrodynamics." Powder Technology 364 (March 2020): 553–61. http://dx.doi.org/10.1016/j.powtec.2020.02.011.

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27

Xiaomin, Hu, Li Chunbo, Duan Qifu, and Diao Jinhun. "The use of polypropylene fibre needlefelt in the filtration of mineral slurries." Filtration & Separation 32, no. 4 (April 1995): 307–11. http://dx.doi.org/10.1016/s0015-1882(97)84054-2.

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28

SØRENSEN, P., and J. A. FERNÁNDEZ. "Dietary effects on the composition of pig slurry and on the plant utilization of pig slurry nitrogen." Journal of Agricultural Science 140, no. 3 (May 2003): 343–55. http://dx.doi.org/10.1017/s0021859603003113.

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The composition of animal manure is influenced by the diet fed. Efforts are made to decrease nitrogen emission from pig production by optimizing diet composition. This normally results in a lower proportion of N excreted in urine relative to faeces, and may also influence the turnover and utilization of manure N after field application. The effects of pig feed composition on the excretion of urinary and faecal N, on the dynamics of manure N in soil and on the potential utilization of manure N in the field was studied. Growing pigs and sows were fed 12 different diets with variable contents of fibre and protein (with or without synthetic amino acids). Slurries consisting of a mixture of faeces and urine were stored according to common agricultural practice in Northern Europe. The plant availability of N in the resultant slurries originating from animals fed known diets was tested in small field plots with barley, under conditions with minimal N losses. Separate plots were fertilized with increasing amounts of mineral N. Nitrogen uptake in barley was determined and the utilization of slurry N was compared with that of mineral fertilizer N. The net release of mineral N and C from the slurries in soil was also measured in a parallel incubation study.The mineral fertilizer equivalent of pig slurry N was 72–100% and significantly influenced by feed fibre composition, but not significantly influenced by the protein content. There was a significant positive correlation between enzyme-digestible organic matter in the pig diet (measurement used for feed evaluation) and the plant availability of pig slurry N (R2=0·90). The ammonium content of stored pig slurry could not be used for prediction of the N availability since the net mineralization of pig slurry N was variable, but there was a significant negative correlation between the pig slurry C/N ratio and the plant availability of slurry N (R2=0·86).Increased dietary concentration of fermentable structural carbohydrates (e.g. by including sugar beet pulp in the diet) reduces the excretion of N in urine without affecting the availability of slurry total N, whereas an increased concentration of dietary fibre with a low fermentability (straw) results in less urinary N, but also a lower plant availability of slurry N.

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29

Makarova, Vera. "Involving technogenic mineral resources in the production of "glass-steel" compositions." MATEC Web of Conferences 265 (2019): 06003. http://dx.doi.org/10.1051/matecconf/201926506003.

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The purpose of this study is to ensure the sustainable development of society by reducing the use of natural resources. Waste from the mining and metallurgical sector is a valuable raw material for the making of glass-steel compositions. The obtained results show that the involvement of man-made waste positively affects the physico-mechanical and operational properties of enamel slurries. The involvement of mining and metallurgical sector waste in the technological cycle of obtaining glass-steel compositions will allow expanding the mineral base for the production of protective coatings while simultaneously ensuring the requirements of environmental safety and protection.

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30

Gamble, Donald S., and Shahamat U. Khan. "Atrazine in mineral soil: chemical species and catalysed hydrolysis." Canadian Journal of Chemistry 70, no. 6 (June 1, 1992): 1597–603. http://dx.doi.org/10.1139/v92-197.

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Equilibrium and kinetics parameters have been evaluated at 25.0 °C for the heterogeneous catalysis of atrazine hydrolysis in slurries of a chemically characterized mineral soil. The fraction of acidic sites that accounts for sorption capacity, and the sorption equilibrium function resemble those for humic acid and organic soil. Sorption and desorption half-lives increased with increasing coverage of sorption sites. The sorption half-lives ranged from 3.6 to 735 days. The desorption half-lives ranged from 1 to 11 days. The hydrolysis half-lives ranged from 9.6 to 168 days and are consistent with Brönsted acid catalysis theory. The relationship of independent variables to data scatter has been analyzed. The information obtained should be useful for water and solute transport models.

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31

Webb, Eric B., Carolyn A. Koh, and Matthew W. Liberatore. "High Pressure Rheology of Hydrate Slurries Formed from Water-in-Mineral Oil Emulsions." Industrial & Engineering Chemistry Research 53, no. 17 (April 17, 2014): 6998–7007. http://dx.doi.org/10.1021/ie5008954.

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32

Pedersen, Betina Nørgaard, Bent T. Christensen, Luca Bechini, Daniele Cavalli, Jørgen Eriksen, and Peter Sørensen. "Nitrogen fertilizer value of animal slurries with different proportions of liquid and solid fractions: A 3-year study under field conditions." Journal of Agricultural Science 158, no. 8-9 (November 2020): 707–17. http://dx.doi.org/10.1017/s0021859621000083.

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AbstractThe plant availability of manure nitrogen (N) is influenced by manure composition in the year of application whereas some studies indicate that the legacy effect in following years is independent of the composition. The plant availability of N in pig and cattle slurries with variable contents of particulate matter was determined in a 3-year field study. We separated cattle and a pig slurry into liquid and solid fractions by centrifugation. Slurry mixtures with varying proportions of solid and liquid fraction were applied to a loamy sand soil at similar NH4+-N rates in the first year. Yields and N offtake of spring barley and undersown perennial ryegrass were compared to plots receiving mineral N fertilizer. The first year N fertilizer replacement value (NFRV) of total N in slurry mixtures decreased with increasing proportion of solid fraction. The second and third season NFRV averaged 6.5% and 3.8% of total N, respectively, for cattle slurries, and 18% and 7.5% for pig slurries and was not related to the proportion of solid fraction. The estimated net N mineralization of residual organic N increased nearly linearly with growing degree days (GDD) with a rate of 0.0058%/GDD for cattle and 0.0116%/GDD for pig slurries at 2000–5000 GDD after application. In conclusion NFRV of slurry decreased with increasing proportion of solid fraction in the first year. In the second year, NFRV of pig slurry N was significantly higher than that of cattle slurry N and unaffected by proportion between solid and liquid fraction.

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33

Harrison, S. T. L., and J. J. Cilliers. "The use of mini-hydrocyclones for differential separations within mineral slurries subjected to bioleaching." Minerals Engineering 10, no. 5 (May 1997): 529–35. http://dx.doi.org/10.1016/s0892-6875(97)00030-7.

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34

Arizmendi-Morquecho, A. M., R. Pérez-Garibay, A. Uribe-Salas, and F. Nava-Alonso. "On-line solids hold-up measurement in mineral slurries by the standard addition method." Minerals Engineering 15, no. 1-2 (January 2002): 61–64. http://dx.doi.org/10.1016/s0892-6875(01)00200-x.

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35

Roach, G., and J. Tickner. "F42 On-Stream XRF Analysis of PPM Concentrations of Heavy Metals in Mineral Slurries." Powder Diffraction 18, no. 2 (June 2003): 183. http://dx.doi.org/10.1154/1.1755177.

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36

David Suits, L., TC Sheahan, T. Abichou, K. Tawfiq, and Y. Abdelrazig. "Using Electrical Conductivity to Estimate Properties of Mineral Slurries Used in Drilled Shaft Construction." Geotechnical Testing Journal 27, no. 6 (2004): 11958. http://dx.doi.org/10.1520/gtj11958.

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37

Van Weert, G., D. Van Der Werff, and J. J. Derksen. "Transfer of O2 from air to mineral slurries in a rushton turbine agitated tank." Minerals Engineering 8, no. 10 (October 1995): 1109–24. http://dx.doi.org/10.1016/0892-6875(95)00076-3.

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38

SØRENSEN, P., M. R. WEISBJERG, and P. LUND. "Dietary effects on the composition and plant utilization of nitrogen in dairy cattle manure." Journal of Agricultural Science 141, no. 1 (August 2003): 79–91. http://dx.doi.org/10.1017/s0021859603003368.

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The influence of dairy cattle feed composition on the manure composition and on the dynamics and plant availability of cattle slurry N was studied. Dairy cows were fed seven different forages either with or without supplemental concentrates. The concentration of N in faeces dry matter varied from 18 to 38 g/kg dry matter and increased with increasing digestibility of the feed. Cattle slurries consisting of a mixture of 0·5 faecal N and 0·5 urinary N were stored according to common agricultural practice in Northern Europe. The mineralization of faecal N during slurry storage was very variable (0·09–0·50). The plant availability of N in the slurries originating from cattle fed with known diets was tested in small, framed field plots with spring barley, under conditions with minimal N losses. The nitrogen uptake in barley was determined and the mineral fertilizer equivalent (MFE) of slurry N was calculated. The net release of mineral N and CO2 from the slurries in soil was also measured in a parallel incubation study. The MFE of cattle slurry N varied from 53 to 75%. After correcting for the measured urine-N/faeces-N ratio and expected ammonia emission, the MFE varied from 51 to 78%. The plant availability and net release of cattle slurry N were influenced by forage type and feeding level. The MFE was negatively correlated with the concentration of crude fibre and neutral detergent fibre (NDF) in the diet, and positively correlated with the dietary protein content. The net release of CO2 from the slurries after 12 weeks in soil was significantly influenced by the concentration of crude fibre in the diet. The plant availability of slurry N was significantly correlated with the ammonium content (R2=0·53) and negatively correlated with the slurry C[ratio ]N ratio (R2=0·67) and the dry matter[ratio ]N ratio (R2=0·58). Residual slurry N left in the soil after harvest of the first crop varied from 0·25 to 0·47 of total slurry N. It is concluded that the fibre and the protein content of cattle diets have a significant influence on the plant availability of cattle slurry N and on the amount of residual slurry N remaining in the soil after the first growing season.

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39

Wang, Qingya, Fusheng Li, Xiaoyu Jiang, Shuangliang Wu, and Muqiang Xu. "On-stream mineral identification of tailing slurries of tungsten via NIR and XRF data fusion measurement techniques." Analytical Methods 12, no. 25 (2020): 3296–307. http://dx.doi.org/10.1039/d0ay00322k.

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40

Madsen, B. W. "A Portable Slurry Wear Test for the Field." Journal of Fluids Engineering 111, no. 3 (September 1, 1989): 324–30. http://dx.doi.org/10.1115/1.3243647.

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A new portable slurry wear test apparatus developed by the Bureau of Mines, U.S. Department of the Interior, makes it possible to gather materials wear and corrosion data at a mineral processing site. The portable wear cell is identical in design to a laboratory cell reported previously. It allows simultaneous evaluation of 16 specimens in a continuous flow of fresh slurry. Data obtained from selected metals and polymers showed high-chromium white cast irons to perform particularly well in tests with an aqueous lead-zinc sulfide ore slurry. However, ultra-high-molecular-weight polyethylene that exhibited superior wear resistance in comparable laboratory tests with an aqueous slurry of silica sand did not perform as well in field tests. Such results show how misleading it can be to use laboratory data to predict relative rates of wear in industrial slurries, even under nominally identical flow conditions. Field testing is therefore needed. In situ electrochemical corrosion measurements on a low-alloy steel showed that the field and laboratory slurries were similarly corrosive.

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41

He, Gui-chun, Yi-ping Mao, and Wen Ni. "A new fractal modification of ultrasonic attenuation model for measuring particle size in mineral slurries." International Journal of Mineral Processing 82, no. 3 (April 2007): 119–25. http://dx.doi.org/10.1016/j.minpro.2006.09.005.

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42

Huynh, Le, Paul Jenkins, and John Ralston. "Modification of the rheological properties of concentrated slurries by control of mineral–solution interfacial chemistry." International Journal of Mineral Processing 59, no. 4 (July 2000): 305–25. http://dx.doi.org/10.1016/s0301-7516(99)00082-4.

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43

DE CAUWER, B., K. VAN DEN BERGE, M. COUGNON, R. BULCKE, and D. REHEUL. "Weed seedbank responses to 12 years of applications of composts, animal slurries or mineral fertilisers." Weed Research 50, no. 5 (September 2, 2010): 425–35. http://dx.doi.org/10.1111/j.1365-3180.2010.00796.x.

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44

Kou, Jiawei, Zongqing Bai, Wen Li, Jin Bai, and Zhenxing Guo. "Effects of mineral matters and hydrogen bonding on rheological behaviors of brown coal–oil slurries." Fuel 132 (September 2014): 187–93. http://dx.doi.org/10.1016/j.fuel.2014.04.087.

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45

Termeer, W. C., and P. R. Warman. "Use of mineral amendments to reduce ammonia losses from dairy-cattle and chicken-manure slurries." Bioresource Technology 44, no. 3 (January 1993): 217–22. http://dx.doi.org/10.1016/0960-8524(93)90155-5.

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46

Engelbrecht, Johann P., S. W. de Bruyn, and Johan P. R. de Villiers. "An Automated On-Stream XRD Analyser for Process Control in the Phosphate Industry." Advances in X-ray Analysis 36 (1992): 333–42. http://dx.doi.org/10.1154/s0376030800018954.

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AbstractA dedicated on-stream X-ray diffraction (XRD) system for the analysis of rock phosphate-bearing slurries was configured to the requirements of industry for process control. The slurry-handling system includes a multiplexer, header tank, de-aerator, sample splitters and two windowless sample presenters. The x-ray system is comprises a line-focus molybdenum anode X-ray tube, two pyrolytic graphite primary-beam monochromators, two vertical fixed-geometry goniometers, and a simultaneous four scintillation-detector system. The X-ray beam is transmitted through the slurry curtains so that the forward diffracted X-ray intensities of apatite (francolite) and quartz are measured simultaneously. Data obtained by the on-stream XRD analyses of apatite and quartz in rock phosphate from the Florida area in the USA are presented. Lower limits of detection in the order of 0.1 per cent can be achieved for both the apatite and quartz in slurries containing 30 per cent solids. The solids content is a variable that must be known if feeds, tailings, and concentrates are to be measured using a universal algorithm. It can be calculated from the total mineral content of the slurry or from density measurements.

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47

Janoš, Pavel, Pavel Kuráň, Jakub Ederer, Martin Šťastný, Luboš Vrtoch, Martin Pšenička, Jiří Henych, Karel Mazanec, and Miroslav Skoumal. "Recovery of Cerium Dioxide from Spent Glass-Polishing Slurry and Its Utilization as a Reactive Sorbent for Fast Degradation of Toxic Organophosphates." Advances in Materials Science and Engineering 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/241421.

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The recovery of cerium (and possibly other rare earth elements) from the spent glass-polishing slurries is rather difficult because of a high resistance of polishing-grade cerium oxide toward common digestion agents. It was shown that cerium may be extracted from the spent polishing slurries by leaching with strong mineral acids in the presence of reducing agents; the solution may be used directly for the preparation of a ceria-based reactive sorbent. A mixture of concentrated nitric acid and hydrogen peroxide was effective in the digestion of partially dewatered glass-polishing slurry. After the removal of undissolved particles, cerous carbonate was precipitated by gaseous NH3and CO2. Cerium oxide was prepared by a thermal decomposition of the carbonate precursor in an open crucible and tested as reactive sorbent for the degradation of highly toxic organophosphate compounds. The samples annealed at the optimal temperature of approximately 400°C exhibited a good degradation efficiency toward the organophosphate pesticide fenchlorphos and the nerve agents soman and VX. The extraction/precipitation procedure recovers approximately 70% of cerium oxide from the spent polishing slurry. The presence of minor amounts of lanthanum does not disturb the degradation efficiency.

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48

Sinitsyna, Olga V., Valentine V. Makarov, Kara McGeachy, Tatyana Bukharova, Eric Whale, David Hepworth, Igor V. Yaminsky, Natalia O. Kalinina, Michael E. Taliansky, and Andrew J. Love. "Virus-Like Particle Facilitated Deposition of Hydroxyapatite Bone Mineral on Nanocellulose after Exposure to Phosphate and Calcium Precursors." International Journal of Molecular Sciences 20, no. 8 (April 12, 2019): 1814. http://dx.doi.org/10.3390/ijms20081814.

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We produced and isolated tobacco mosaic virus-like particles (TMV VLPs) from bacteria, which are devoid of infectious genomes, and found that they have a net negative charge and can bind calcium ions. Moreover, we showed that the TMV VLPs could associate strongly with nanocellulose slurry after a simple mixing step. We sequentially exposed nanocellulose alone or slurries mixed with the TMV VLPs to calcium and phosphate salts and utilized physicochemical approaches to demonstrate that bone mineral (hydroxyapatite) was deposited only in nanocellulose mixed with the TMV VLPs. The TMV VLPs confer mineralization properties to the nanocellulose for the generation of new composite materials.

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49

Hessley, R. K. "Luminescence in coal and its relation to clay minerals." Clay Minerals 24, no. 1 (March 1989): 107–13. http://dx.doi.org/10.1180/claymin.1989.024.1.09.

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AbstractRoom-temperature dehydration of aqueous coal slurries, coal extraction residue, or coal ash results in spontaneous luminescence. The phenomenon is characterized by a monotonic decay in photon activity which precedes a sharp rise in photon release. A maximum is reached within several minutes but subsequent decay is slower and photon emission continues for an extended period of time. The magnitude of photon activity is severely limited by the thickness of the strongly absorbing coal slurry. Prior removal of mineral matter from the coal appears to curtail the dehydration-induced phenomena, suggesting that clays or clay-organic interactions are responsible. Data also suggest that air is required as a medium for discharging the excited species.

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50

Dziurzyński, Wacław, Andrzej Krach, and Teresa Pałka. "COMPUTER SIMULATION OF THE PROPAGATION OF HEAT IN ABANDONED WORKINGS INSULATED WITH SLURRIES AND MINERAL SUBSTANCES." Archives of Mining Sciences 59, no. 1 (March 1, 2014): 3–23. http://dx.doi.org/10.2478/amsc-2014-0001.

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Abstract In the paper the results of investigations aimed at further identification of the phenomena occurring in abandoned workings and connected with the flow of air-gas (methane, carbon dioxide, nitrogen, oxygen and carbon oxidation products) mixture with taking into consideration the impact of supplied mineral substances on the processes of self-heating of the coal left in goaves were presented. The known and successfully used method for the prevention of fires in abandoned workings is the technology of filling goaf with an ash-air mixture, which also raises the issue of the effective use of that mixture. The computer, i.e. digital simulation methods being developed and intended for the purpose of the process discussed here are a good complement of the use of that technology. A developed mathematical model describing the process of additional sealing of gob with wet slurry supplied with three pipelines is based on the balance of volume of the supplied mixture and contained in the body created in goaves. The form of that body was assessed on the basis of the observation results available in literature and the results of model investigations. The calculation examples carried out for the the longwall area and its goaf ventilated with the “U” system allow to state that the introduced modification of the mathematical model describing the flow of the mixture of air, gases, and wet slurry with consideration of the coal burning process in the fire source area was verified positively. The digital prognostic simulations have confirmed a vital impact of the wet slurry supplied into the goaf on the processes of coal burning and also the change of rate and volume flow rate of the air mixture in goaf. As a complement to the above it should be noted that such elements as the place of the slurry supply in comparison with the longwall inclination or fire source area location is of great importance for the effectiveness of the fire prevention used. The development of computer/ digital simulation methods requires further investigations of the model adopted in this study. Those investigations should be aimed at making credible the theoretical model of the mixture flow through porous medium and the supplied mineral material. Such investigations will allow to verify the body form based on the mixture parameters such as humidity, viscosity, and fluidity and depending on the properties of the porous medium. Further development of the modelling of the phenomena discussed in this paper should be based on the methods of use of the description of the flow of fluids and slurry on the basis of 3D models.

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