题目

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摘要：研究“扩散渗析预处理—逆流净化—中和沉铜—调PH沉镍”回收硫酸铜脱砷母液中酸及有价金属铜、镍的处理工艺.试验表明：控制脱砷母液流量为220L／h,脱砷母液流量与水流量比为1.1时,酸回收率达77.92%,铜、镍截留率达98%以上,砷截留率达80%以上；中和沉铜控制温度80-90℃、液固比（2-3）：1、反应时间3h、终点PH值5.0,铜沉降率达95%以上,镍沉降率为2%以下；调PH沉镍控制PH值至12-13、温度80-90℃、反应时间3h,镍沉淀率达到98%以上,得到的氢氧化镍渣含镍达32.83%,可作为生产硫酸镍等化工产品的原料.

提问时间：2020-11-20

答案

Abstract: the "diffusion dialysis pretreatment countercurrent purification andneutralization and precipitation of copper - PH nickel deposition" recovery of copper sulphate removal process in mother liquor of arsenic acid and valuable metals copper, nickel. Experiments show that: the control of arsenic removal liquid flow rate is 220L / h, arsenic removal liquid flow and water flowratio is 1.1, acid recovery rate reached 77.92%, copper, nickel interceptionrate reaches above 98%, arsenic retention rate is above 80%; neutralization and precipitation of copper to control the temperature of 80-90 ℃, solid-liquid ratio (2-3): 1, the reaction time is 3h, the end pH value of 5, Cu depositionrate is above 95%, the nickel deposition rate is below 2%; adjusted PH nickel deposition pH control to 12-13, temperature 80-90 ℃, reaction time 3h, nickel precipitation rate of more than 98%, nickel slag from nickel containing up to 32.83%, can be used as the production of nickel sulfate and other chemical products raw material.