随着易处理金矿的减少，含砷金矿已成为金提取的重要资源，但砷对金浸出有不利影响，需要在浸金之前进行去除。进行了氢氧化钠溶液浸出金矿中砷的研究，考察了浸出时间、氢氧化钠用量及液固比等因素对金矿中砷浸出的影响。氢氧化钠溶液可以将金矿中的 FeAsS 及 AsS 分解为FeS2和 As2O3，通过正交实验及单因素实验获得了较优的砷浸出条件。在温度100℃、氢氧化钠用量500 kg/t、浸出时间2.5 h、液固比5：1的条件下，砷的浸出率达到80.10%。
With the increasingly reduction of easily leachable gold ores, the gold ore contain arsenic has become an important resource. The arsenic in the gold ore must be removed before leaching because it will have negative effect on leaching gold in the ore. The sodium hydroxide solution was used to leaching the arsenic in the gold ore. The effects of influential factors on the leaching arsenic in the gold ore were investigated. These factors included leaching time, sodium hydroxide concentration and ratio of liquid to solid. Sodium hydroxide solution can decompose FeAsS and AsS into FeS2 and As2O3. The optimal leaching conditions were worked out through orthogonal test and single factor test. The optimal conditions are as follows:temperature 100℃, sodium hydroxide concentration 500 kg/t, leaching time 2.5 hours and ratio of liquid to solid is 5:1, the leaching rate of arsenic up to 80.10%.
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