Abstract The leaching of scheelite using H2O2 in a H2SO4 solution was assessed. In this sulfuric acid‑hydrogen peroxide leaching system, the conversion of CaWO4 to CaSO4·nH2O and H2WO4 together with the complexation of H2O2 with tungstic acid was utilized to efficiently and cleanly treat scheelite. The results showed that leaching of scheelite in this system was feasible, and the most suitable reaction conditions for the leaching of scheelite were defined, including the effects of sulfuric acid and hydrogen peroxide concentrations, reaction temperature and time, and the liquid-solid ratio (L/S ratio). Increasing the concentration of sulfuric acid to as high as 3 mol L−1 could significantly increase the leaching efficiency of scheelite. Increased concentration of H2O2 was also beneficial to the reaction. The decomposition of both H2O2 and peroxytungstic acid at temperatures above 45 °C decreased the leaching efficiency. The most suitable experimental reaction conditions were as follows: c(H2SO4) =3 mol L−1, c(H2O2) = 1.5 mol L−1, L/S = 10, 45 °C, and a reaction time of 90 min. Under these conditions, the leaching efficiency could reach as high as 99.7%. As such, it was apparent that the treatment of scheelite in this sulfuric acid‑hydrogen peroxide system could achieve a high leaching efficiency at a low temperature and normal pressure.

中文翻译：

---

白钨矿在硫酸和双氧水溶液中的高效浸出

摘要 评估了在 H2SO4 溶液中使用 H2O2 浸出白钨矿。在这种硫酸-过氧化氢浸出系统中，利用 CaWO4 向 CaSO4·nH2O 和 H2WO4 的转化以及 H2O2 与钨酸的络合来高效清洁地处理白钨矿。结果表明，该体系浸出白钨矿是可行的，确定了最适合白钨矿浸出的反应条件，包括硫酸和双氧水浓度、反应温度和时间、液固比的影响。 L/S 比）。将硫酸浓度提高到 3 mol L−1 可以显着提高白钨矿的浸出效率。增加 H2O2 的浓度也有利于反应。H2O2 和过钨酸在高于 45°C 的温度下分解会降低浸出效率。最合适的实验反应条件如下：c(H2SO4) =3 mol L-1，c(H2O2) = 1.5 mol L-1，L/S = 10，45 °C，反应时间为90 min。在此条件下，浸出效率可高达99.7%。因此，很明显，在这种硫酸-过氧化氢系统中处理白钨矿可以在低温常压下实现较高的浸出效率。