对生物氧化提金废液中的砷、铁进行分离后得到砷的富集液,利用水合肼湿法提取单质砷.进行了水合肼还原砷酸钠制备单质砷的热力学分析,考察了pH值、水合肼过量系数、水合肼的稀释倍数、温度、超声功率等工艺参数对砷一次回收率的影响.结果表明,当温度70℃,pH=7,超声功率为160W时,砷一次还原率可达62.9%,再用40%的次亚磷酸钠进行二次还原,可将砷的还原率提高到91.77%. Arsenic and iron were separated from bio-oxidized gold extraction effluent to obtain arsenic enrichment solution, and hydrazine monohydrate was used to extract elemental arsenic.Hydroxylhydrazine was used to reduce elemental arsenic from sodium arsenate, and the effects of pH value , Hydrazine hydrate excess coefficient, dilution ratio of hydrazine hydrate, temperature, ultrasonic power and other process parameters on the recovery rate of arsenic.The results showed that when the temperature is 70 ℃, pH = 7, the ultrasonic power is 160W, the primary reduction rate of arsenic Up to 62.9%, then re-use 40% sodium hypophosphite secondary reduction, the arsenic reduction rate can be increased to 91.77%.