Abstract
Based on physicochemical study of the reaction between scheelite and NaOH, a new decomposition process for scheelite and scheelite-wolframite concentrate, i. e., mechenically activating caustic decomposition has been developed, and it has been successfully used on a commercial scale in 11 tungsten plants in our country. Industrial practice has shown that a tungsten recovery higher than 98% for sheelite concentrate and 99% for scheelite-wolframite mixed concentrate is obtained, under the conditions of NaOH/WO3 mole ratio of 3.6–4.8, 160–170 °C, and it is suitable to treat almost any sort of tungsten ore concentrates, including low grade complex concentrate, and it is more effective than the traditional soda ash digestion process.
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References
Li Honggui, Liu Maoshen, Si Zegin,et al. Process and equipment of caustic decomposition of low-grade scheelite and scheelite-wolframite mixed concentrates. Chinese Patent, 85100350. 8, 1985-04-01
Li Honggui, Liu Maoshen, Li Yunjiao,et al. : Recovery of tungsten from low-grade scheelite and scheelite-wolframite concentrates by mechanically activating caustic leaching. In: Fu Chongyue ed. Proceedings of the 1st International Conference on the Metallurgy and Materials Science of W, Ti, Re and Sb, Vol 1. Changsha, 1988. 192–197
Sun Peimei, Li Yunjiao, Li Honggui,et al. Thermodynamic study on the caustic decomposition of scheelite. Trans Nonferrous Metals(in Chinese), 1993,4:37–43
Li Yunjiao, Li Honggui, Liu Maoshenet al. Thermodynamic and kinetic study on the alkaline decomposition of scheelite. J Cent South Inst Min Metall(in Chinese), 1990, 21(1):39–45
Li Honggui, Sum Peimei, Liu Masshen,et al. A study of solubility of Na2WO4 in the system of NaOH-H2O. J Cent South Inst Min Metall(in Chinese), 1991,22(6):644–649
Liu Maosheng, Sum Peimei, Li Honggui,et al.: Mechanical activated caustic decomposition of tungsten concentrate with a high content of calcium. In: Chenjiayong ed. Proceedings of The 2th International Conference of Hydrometallurgy. Vol 1. Changsha: International Academic Publishers, 1992. 296–301
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Project supported by the Nonferrous Metals Industry Corporation of China
Synopsis of the first author Li Honggui, professor, born in 1934. Research areas are: metallurgy of rare metals, hydrometallurgy, mechanico-chemistry. Main awards are: Invention Prize of the National Scientific and Technological Committee of China (2nd class) (1993); Scientific and Technological Achievement Prize of Guangxi Zhuang Automous Region (2nd class) (1990); Chinese Excellent Patent Patent Prize of People’s Republic of China(1993); Best Patent Prize of the Patent Office of Hunan Province (1990), Excellent Scientists of Hunan Province (1990).
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Li, H., Liu, M., Sun, P. et al. Caustic decomposition of scheelite and scheelite-wolframite concentrates through mechanical activation. J. Cent. South Univ. Technol. 2, 16–20 (1995). https://doi.org/10.1007/BF02652001
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DOI: https://doi.org/10.1007/BF02652001