摘要:
工业硫酸镍中含有铁、钙、镁等杂质,结合除铁钙镁杂质的工艺原理分析,采用先除去铁杂质再除钙镁杂质的除杂质工艺进行实验研究.采用添加双氧水和中和剂碳酸镍的方法对工业硫酸镍中的铁杂质进行净化研究:采用添加沉淀剂氟化铵和中和剂碳酸镍的方法对工业硫酸镍中的钙镁杂质进行净化研究.实验结果表明,净化率随着pH、反应温度、静置时间、沉淀剂添加量的增加而增加,随铁与双氧水的物质的量比、浆化比(中和剂与水的体积比)的减小而增加.当反应温度为50°C、pH=5、加入铁离子与双氧水物质的量比为1∶4、浆化比为1∶2时,铁的净化率为97%左右.当pH=4.5、反应温度为70°C、静置时间为30h、沉淀剂氟化铵的添加量为0.15g时,钙镁的净化率分别为85%和90%.该实验证明所采用的方法不会引入新的杂质,操作简便、可行.%In the industrial nickel sulfate,it contains a certain amount of impurities,such as iron,calcium and magnesium.Removing impurities of Fe(Ⅱ),Ca(Ⅱ) and Mg(Ⅱ) in industrial nickel sulfate was studied by remove the Fe(Ⅱ) impurity firstly then remove the Ca(Ⅱ) and Mg(Ⅱ) impurities based on the technical principle of the removing impurities.Removing impurity of Fe(Ⅱ) in industrial nickel sulfate was studied with H2O2 and NiCO3 as oxidizing agent and neutralizer,respectively.In addi tion,removing impurities of Ca(Ⅱ) and Mg(Ⅱ) in industrial nickel sulfate was studied with NH4F and NiCO3 as precipitator and neutralizer,respectively.The results indicated that the purification rate increased with the increasing pH,reaction temperature,standing time and the content of the precipitant in the process of the removing impurities and decreased with the decreasing of amount of substance ratio of Fe and H2O2 and slurrying ratio.When the reaction temperature was 50 °C,pH was 5,the amount-of-substance ratio of Fe to H2O2 was 1 ∶4,and slurrying ratio (volume ratio)was 1∶2,the purification rate of Fe(Ⅱ) reached 97%.When the reaction temperature was 70 °C,pH was 4.5,standing time was 30 h,and the content of the precipitant was 0.15 g,the purification rates of Ca(Ⅱ) and Mg(Ⅱ) reached 85% and 90%,respectively.In addition,this experiment method was feasible,easy to realize and not to introduce new impurity.