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2020, vol. 68, iss. 1, pp. 65-78
Deposition of silica in hydrometallurgical processes
RWTH Aachen University, IME Process Metallurgy and Metal Recycling, Aachen, Federal Republic of Germany,
The research leading to these results has received funding from the European Communitys Seventh Framework Programme (Call identifier FP7-NMP-2012-LARGE-6) under grant agreement n°309373

Introduction/purpose: Dissolution of nonferrous metals from oxidic ores such as laterite, high silicon bauxite and eudialyte during acidic treatment was connected with silica gel formation. Methods: Familiarity with behavior of silica in hydrometallugical processes such as dissolution at atmospheric and high pressure, precipitation, neutralization and filtration is most important for the recovery of metals from water solution. Results: Gel formation was avoided using dry digestion and a carbonation process of olivine under high pressure in an autoclave. Conclusion: Fine silica was prepared from olivine in water solution at 175°C and 120 bar for 4 hours in an autoclave using some additives such as sodium bicarbonate and oxalic acid.
Alkan, G., Yagmurlu, B., Gronen, L., Dittrich, C., Ma, Y., Stopic, S., Friedrich, B. (2019) Selective silica gel free scandium extraction from Irondepleted red mud slags by dry digestion. Hydrometallurgy, 185, pp.266-272
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Ma, Y., Stopic, S., Gronen, L., Milivojevic, M., Obradovic, S., Friedrich, B. (2018) Neural network modeling for the extraction of rare earth elements from eudialyte concentrate by dry digestion and leaching. Metals, 8(4), p.267
Ma, Y., Stopic, S., Friedrich, B. (2019) Hydrometallurgical Treatment of an Eudialyte Concentrate for Preparation of Rare Earth Carbonate. Johnson Matthey Technology Review, 63(1): 2-13
Nakashima, Y., Takai, C., Razavi-Khosroshahi, H., Suthabanditpong, W., Fuji, M. (2018) Synthesis of ultra-small hollow silica nanoparticles using the prepared amorphous calcium carbonate in one-pot process. Advanced Powder Technology, 29(4), pp.904-908
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Stopic, S., Dertmann, C., Koiwa, I., Kremer, D., Wotruba, H., Etzold, S., Telle, R., Knops, P., Friedrich, B. (2019) Synthesis of Nanosilica via Olivine Mineral Carbonation under High Pressure in an Autoclave. Metals, 9(6): 708-708
Stopic, S., Dertmann, C., Modolo, G., Kegler, P., Neumeier, S., Kremer, D., Wotruba, H., Etzold, S., Telle, R., Rosani, D., Knops, P., Friedrich, B. (2018) Synthesis of Magnesium Carbonate via Carbonation under High Pressure in an Autoclave. Metals, 8(12): 993-993
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article language: English
document type: Review Paper
DOI: 10.5937/vojtehg68-21152
published in SCIndeks: 02/02/2020
peer review method: double-blind
Creative Commons License 4.0

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