Methanesulfonic acid (CH₃SO₃H) is a nonvolatile acid, and its calcium salt shows high solubility. These advantages of CH₃SO₃H have been utilized to leach scheelite in the presence of H₃PO₄. Thus, tungsten enters the solution as phosphotungsten heteropolyacid and calcium enters the solution as a soluble calcium salt. Because of the absence of solid products, over 98.5% of the scheelite was digested under the following conditions: CH₃SO₃H concentration of 2.5 mol/L, H₃PO₄ concentration of 10 g/L，a liquid/solid ratio of 10:1, a leaching temperature of 80 °C, and a leaching time of 4 h. Over 99.9% tungsten was extracted from the leaching solution under the following conditions: 15% N1923 concentration, an O/A ratio of 1:1, a temperature of 20 °C, and a contact time of 10 min. Then, CH₃SO₃H was regenerated by adding H₂SO₄ to the raffinate, producing a high-quality gypsum. Subsequently, the solution obtained from the CH₃SO₃H regeneration process was reused to leach scheelite after adding the consumed CH₃SO₃H. The efficient extraction of tungsten and the decrease in wastewater and waste residue discharge in this technology indicate its potential for industrial applications.

甲磺酸（CH ₃ SO ₃ H）是一种非挥发性酸，其钙盐具有很高的溶解度。_{CH 3} SO ₃ H的这些优点已被用于在 H ₃ PO ₄存在下浸出白钨矿。因此，钨作为磷钨杂多酸进入溶液，而钙作为可溶性钙盐进入溶液。由于没有固体产物，超过 98.5% 的白钨矿在以下条件下被消解： CH ₃ SO ₃ H 浓度为 2.5 mol/L，H ₃ PO ₄浓度10 g/L，液固比10:1，浸出温度80 ℃，浸出时间4 h。在以下条件下从浸出液中提取超过 99.9% 的钨：15% N1923 浓度、1:1 的 O/A 比、20°C 的温度和 10 分钟的接触时间。然后，通过向萃余液中添加 H ₂ SO ₄使CH ₃ SO ₃ H 再生，生产出高质量的石膏。随后，将CH ₃ SO _{3 H再生过程中得到的溶液加入消耗的CH 3} SO ₃后，重新用于浸出白钨矿。H.该技术中钨的高效提取以及废水和废渣排放的减少表明其具有工业应用潜力。