【摘要】 采用酸式硫酸盐与钨矿焙烧的方式，可将钨矿中砷转变为易挥发的砷化物并由碱液吸收，从源头上改变砷在钨冶炼系统中易分散的走向，大大减少钨冶炼中含砷危废渣的形成；同时，钨矿经焙烧转变为MnSO₄、Fe₂（SO₄）₃+WO₃或CaSO₄+WO₃产物，下一步则需将焙烧产物中钨与杂质进行有效分离，以得到较纯的钨化合物。通常，采用廉价的硫酸即可有效溶解MnSO₄、Fe₂（SO₄）₃,但其是否同样可溶解CaSO₄和WO₃不得而知。基于此，本文系统地研究了CaSO₄-WO₃体系在硫酸中的溶解行为。结果表明：在硫酸体系中，CaSO₄溶解度显著大于WO₃溶解度，二者溶解度差异随硫酸浓度变化较小，随温度变化较大；控制一定的酸度和温度可实现CaSO₄与WO₃的有效分离。更多还原

【Abstract】 By using the method of bisulfate and tungsten ore roasting, arsenic in tungsten ore could be converted into volatile arsenide and absorbed by the alkaline solution, fundamentally changing the easy-dispersion trend of arsenic in the tungsten smelting system and greatly reducing the formation of the arsenic-containing hazardous waste in tungsten smelting.Simultaneously, the tungsten ore is roasted into MnSO₄,Fe₂（SO₄）₃+WO₃ or CaSO₄+WO₃ products, and the next step is to separate tungsten and impurities in the roasted products effectively to obtain relatively pure tungsten compounds.In general, MnSO₄ and Fe₂（SO₄）₃ could be effectively dissolved by cheap sulfuric acid, but whether CaSO₄ and WO₃ could be dissolved in the same way is unknown.Based on this, the dissolution behavior of CaSO₄-WO₃ system in sulfuric acid was systematically studied in this paper.The results show that in the sulfuric acid system, the solubility of CaSO₄ is significantly greater than that of WO₃,and their solubility difference varies little with the concentration of sulfuric acid but greatly with temperature.The effective separation of CaSO₄ and WO₃ can be achieved by controlling certain acidity and temperature.更多还原