In this paper, tungsten was extracted from wolframite using sulfuric-phosphoric acid mixtures. During leaching, wolframite was decomposed under acidic conditions, and phosphotungsten heteropoly acid was formed by the complexation of tungsten and phosphorus. The XRD results showed that after wolframite leaching, the residue contained unleached wolframite, quartz, small amounts of calcium sulfate (anhydrite) and phosphotungstate salts. When the concentration of H₂SO₄ was 2.5 mol/L, the concentration of H₃PO₄ was 2.0 mol/L, the liquid–solid ratio was 10 mL/g, the reaction time was 4 h, and the reaction temperature was 140 ℃, the maximum leaching efficiency of tungsten reached 98.8%. This method broadens the applicability of the sulfuric-phosphoric mixed acid system to the decomposition of wolframite under pressure hydrometallurgical conditions.

在本文中，使用硫酸-磷酸混合物从黑钨矿中提取了钨。浸出过程中，黑钨矿在酸性条件下分解，钨和磷的络合形成磷钨杂多酸。XRD结果表明，黑钨矿浸出后，残留物中含有未浸出的黑钨矿，石英，少量的硫酸钙（硬石膏）和磷钨酸盐。当H ₂ SO ₄的浓度为2.5 mol / L时，H ₃ PO ₄的浓度钨的浸出率为2.0 mol / L，液固比为10 mL / g，反应时间为4 h，反应温度为140℃，钨的最大浸出效率达到98.8％。该方法拓宽了硫酸-磷酸混合酸体系在加压湿法冶金条件下分解黑钨矿的适用性。