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针对甘肃坪定金矿含金、砷高，脉石碱度高，砷矿物中雌黄、雄黄高的特点，研究了硫氨脱砷－铜氨催化氧化－氰化新工艺，采用了三种新技术，即稀氨水溶解雌黄、雄黄湿法转化为雌黄以及在氨水中氧化时用铜离子作催化剂.本研究为小型实验，结果为其后进行的3kg级扩试所证实。
In view of the high gold content, high arsenic content and high salinities of Pingding gold deposit in Gansu Province, the azo mineral is characterized by high concentrations of female yellow and male yellow, Technology, dilute ammonia dissolves the rehmannia, realgar into wet yellow femal and oxidation of ammonia in the use of copper ions as a catalyst.This study is a small experiment, the results for the subsequent test 3kg expansion confirmed.