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从热力学计算及实验两方面研究了酸性冶金废液中以砷酸铁形式中和沉淀脱砷过程. NaOH中和沉砷时，溶液含砷量主要取决于终pH值，在pH=5~6的范围内，溶液中砷含量最低. 结果表明，采用NaOH作中和剂时，为了达到低于0.5 mg/L的排放标准，需要加入一定量氧化剂(如H2O2)，使溶液中的砷完全转变成砷酸形式，并需严格控制pH=6左右；采用CaCO3和CaO作中和剂，pH(6，不用氧化剂也可达到排放标准. 同时，还对高温水解脱砷过程进行了讨论.
The arsenic removal from arsenic in ferrous smelting was studied from the aspects of thermodynamic calculation and experiment.When the arsenic was neutralized by NaOH, the arsenic content in the solution mainly depended on the final pH value, and at pH = 5-6 , The content of arsenic in the solution was the lowest.The results showed that when using NaOH as the neutralizer, a certain amount of oxidant (such as H2O2) should be added in order to achieve the emission standard lower than 0.5 mg / L, so as to completely change the arsenic in the solution Into arsenic acid form, and should be strictly controlled pH = 6; CaCO3 and CaO as a neutralizer, pH (6, without the oxidant can also meet emission standards.At the same time, the process of high temperature hydrolysis of arsenic was also discussed.