还原酸浸法从低品位水钴矿中提取铜和钴

以Na2SO3为还原剂从水钴矿还原酸浸液中提取铜和钴,研究了还原剂种类及用量、浸出温度、硫酸浓度等因素对水钴矿还原酸浸过程中有价金属铜和钴浸出率的影响。结果表明,Na2SO3是较适宜的还原剂;在还原剂用量为水钴矿原矿质量的10%、硫酸浓度为3 mol/L、浸出温度为60℃、液固比为2-1、浸出时间为60 min的条件下,铜和钴的浸出率分别达99.06%和98.87%。并提出了"M5640萃铜→黄钠铁矾法除铁→碳酸钠除铝→氟化钠除钙、镁→蒸发结晶得钴产品"的后续分离净化流程,能有望应用于水钴矿及类似物料中有价金属的提取与分离的工业生产。

Recovery of copper and cobalt from low-grade heterogenite with reductive acid leaching method

Copper and cobalt were leached from heterogenite in sulfuric acid using Na2SO3 as reducing agent,and the influences of the type and amount of reducing agent,leaching temperature,acid concentration,etc on leaching rates of copper and cobalt were investigated through single-factor experiments.The results show that the optimal conditions,at which the leaching efficiencies of copper and cobalt were 99.06% and 98.87%,were as follows: the dosage of Na2SO3 is 10% of the mass of heterogenite,and c(H2SO4)=3 mol/L,T=60 ℃,L/S ratio=2:1,t=60 min.The proposed flowsheet is Cu recovery by M5640→Fe removal by jarosite→Al removal by Na2CO3→Ca,Mg removal by NaF→evaporative crystallization valuable.This process flow can be applied in the extraction of metals from heterogenite and similar materials effectively in industry.