Study of equilibrium dissolution of WO3–CaSO4 in HCl–Na2SO4 solution

There are numerous issues in the mainstream process of alkali decomposition of tungsten ores, such as large water consumption, large amounts of wastewater, and high processing costs, which add the dual pressure of economic and environmental protection on smelting enterprises and prevent them from me...

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Published in工程科学学报 Vol. 45; no. 6; pp. 883 - 889
Main Authors Lüe-wei XU, Bing-xuan HE, Guo-zuan XU, Xin LEI, Hao-dong HU, Yong LIANG, De-gang LIU
Format Journal Article
LanguageChinese
Published Science Press 01.06.2023
Subjects
calcium sulfate
hydrochloric acid
sodium sulfate
solubility
tungsten trioxide
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Summary:There are numerous issues in the mainstream process of alkali decomposition of tungsten ores, such as large water consumption, large amounts of wastewater, and high processing costs, which add the dual pressure of economic and environmental protection on smelting enterprises and prevent them from meeting the industry’s development needs. As a result of a series of studies on scheelite roasting and decomposition processes, our team innovatively proposed the use of acid roasting to develop the process of sulfate decomposition of scheelite so that CaWO4 in the scheelite could be transformed directly into WO3. In addition to WO3, the roasting products contained soluble Na2SO4 and insoluble CaSO4. Because CaSO4 can be dissolved in hydrochloric acid, it can be separated from WO3 via hydrochloric acid leaching to further enrich WO3, resulting in a higher-grade material for subsequent procedures. In the presence of Na2SO4, its effect on the dissolution of WO3 or CaSO4 in hydrochloric acid will directly determine the
ISSN:2095-9389
DOI:10.13374/j.issn2095-9389.2022.03.25.001