从红土镍矿硫酸焙烧-水浸出溶液中回收铁、镍的研究

Nickel industry in China is facing a serious resource issues, low-grade laterite nickel ore resource has become the main development object. In this paper, for now the problem on the comprehensive utilization of valuable metals of leaching liquid obtained from nickel laterite ore treated by sulfuric acid method, 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 oC 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 oC 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.