选择性浸出硫化镍精矿中的镁

Selective Leaching of Magnesium from Nickel Sulfide Concentrate

采用硫酸选择性浸出高含镁硫化镍精矿,考察了加酸量、液固比、反应时间、反应温度对浸出率的影响。结果表明,在每千克精矿加入150mL浓硫酸、液固比1∶1、常温反应0.5h的条件下,镍、铜、钴浸出率分别为6.61%、6.67%、6.84%,精矿中MgO含量可以从10.80%降至5.57%,降镁后硫化镍精矿热值低于2 017MJ/t,浸出液加入硫化钠可将浸出液中镍、铜分别降至5.2mg/L、0.6mg/L以下。

High magnesium bearing nickel sulfide concentrate was selectively leached by sulfuric acid.The effects of dosage of sulfuric acid,ratio of liquid to solid（L/S）,reaction time and temperature on leaching rate were investigated.The results show that the leaching rate of nickel,copper,and cobalt is 6.61%,6.67%and 6.84%,respectively,and the MgO content is reduced from 10.80%to 5.57%under the optimum conditions including dosage of sulfuric acid of 150mL for one kilogram concentrate,L/S of 1∶1,and leaching time of 0.5hat room temperature.The smelting calorific value of de-magnesium nickel sulfide concentrate is less than 2 017MJ/t.The concentration of nickel and copper in lixivium is reduced to 5.2 mg/L and 0.6mg/L respectively after adding of sodium sulfide.