2000, Volume 2, Issue 3
Strategic Study of CAE >> 2000, Volume 2, Issue 3
Studies on the Inhibition of Impurities in Caustic Decomposition of Tungsten Concentrates
Central-South University of Technology, Changsha 410083, China
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Abstract
The Inhibition of impurities of As, P, Si and Sn in the caustic decomposition of tungsten concentrates was studied. It indicated that in the presence of scheelite (CaWO4) and Ca(OH)2, during caustic decomposition of sdheelite with NaOH, impurities, such as As, P, Si, will be more completely inhibited in the cake in the forms of NaCaAsO4, Ca3(AsO4)2, Ca3(PO4)2，Ca5(PO4)3(OH)，CaSO3 and CaSnO3. It has been proved in laboratory experiment and industrial practice that the content of As and Si in the Na2WO4 solution from caustic decomposition of scheelite and wolframite mixed concentrates is only 20%〜30% of that from caus-tic decomposition of wolframite concentrates with the same contents of WO3 and impurities.
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References
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