红土镍矿硫酸焙烧-浸出溶液中铁、镍回收的研究

Research on the Recovery of Iron and Nickel from Leaching Liquid of Laterite Nickel Ore Treated by Sulfuric Acid Roasting-water Leaching

以红土镍矿硫酸焙烧-浸出所得浸出液为原料,利用氨水调节溶液的pH值,进行铁、镍的分离与回收研究。通过探索温度、pH值对浸出液中铁、镍、镁离子沉淀的影响,得出沉淀铁离子的适宜条件为:温度30℃,pH=4.0,铁的沉淀率可达到99%以上,镍、镁沉淀率小于4%;沉淀镍离子的适宜条件为:温度60℃,pH=7.0,镍的沉淀率可达到95.5%以上,镁沉淀率低于10%。本研究所提出的分步水解法分离、回收有价金属的工艺将为红土镍矿硫酸法浸出液的综合利用提供技术指导。

Sulfuric acid roasting-water leaching liquid of nickel laterite ore was chosen as a raw material to study the separation and recovery of iron and nickel using ammonia to adjust pH value of solution.Through investigating the effect of temperature and pH on the precipitation of iron,nickel and magnesium irons,an appropriate precipitation condition of iron ions and nickel was obtained,respectively.When temperature is 30℃and pH=4.0,iron precipitation rate can reach more than 99%,the precipitation rate of nickel and magnesium is less than 4%.When temperature is 60℃ and pH=7.0,a nickel precipitation rate of 95.5%was reached,while the precipitation rate of magnesium is lower than 10%.The process of recovering valuable metal step-by-step put forward in this study provides technical guidance for the comprehensive utilization of leaching solution from low-grade nickel laterite ore treated by sulfuric acid method.