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Separation of W and Mo from their peroxoacids solutions by thermal decomposition 被引量:4
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作者 张文娟 李江涛 +1 位作者 赵中伟 李飞 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第10期2731-2737,共7页
A separation method for W and Mo from peroxoacids solution by thermal decomposition wasstudied. Thermal decomposition of peroxotungstic acid and peroxomolybdic acid was investigated respectively. The results confirmed... A separation method for W and Mo from peroxoacids solution by thermal decomposition wasstudied. Thermal decomposition of peroxotungstic acid and peroxomolybdic acid was investigated respectively. The results confirmed that peroxomolybdic acid showed a preferable stability compared with peroxotungstic acid. This thermal stability difference was the basic principle of theseparationof W and Mo. Experiments were performed to study the effects of temperature, stirring speed, free acid concentration and Mo concentration on the separation efficiency. The results indicated that peroxotungstic acid decomposed into tungstic acid(H2WO4) and precipitated selectively,while Mo was rejected in aqueous solution,realizing good separation of W and Mo. The separation factorof W and Moreached 112 under the studied conditions, which indicated that this method has potential for use in separating W and Mo. 展开更多
关键词 W MO W MO SEPARATION thermal decomposition peroxotungstic acid peroxomolybdic acid
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studies on the Mechanism of Producing Tungstic Acid by Complex-Homogeneous Precipitation Method
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作者 Jiang Anren and Pang Zhen (Department of Ccemistry Fudan University, Shanghai) 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1989年第2期3-119,共8页
A new method of producing tungstic acid with a yield over 98% at room temperature and low acidity is advanced and referred to as Complcx -Homogeneous Precipitation Method. If combined with the treatment of activated c... A new method of producing tungstic acid with a yield over 98% at room temperature and low acidity is advanced and referred to as Complcx -Homogeneous Precipitation Method. If combined with the treatment of activated charcoal in recovering the remnant tungsten left in the filter liquor, a perfect closed technological process can be obtained. The key to this method is to prevent the formation of pseudo-metatungstatc during scdium rungstate being acidified directly with the aid of the complexing-protecting agent H2O2, The perexo-mtermediate, which was prepated and identified as dipcroxytetratnngstate by IR and Raman analysis by comparison with diperorytetramolybdate, can be decomposed by SO2 tapidly and quantitatively. The tungstic acid precipitate can be filtered and washed easily. The related mechanisin is studied. 展开更多
关键词 Tungstic acid peroxotungstic acid Homogeneous Precipitation COORDINATION
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