(1. 中南大学 冶金科学与工程学院，长沙 410083；2. 金川集团有限公司，金昌 737100)
摘 要: 采用沉矾浸出法将铁质矿浸出液对镁质矿进行沉矾浸出。结果表明：镁质矿酸浸过程中，在镁质矿粒度为106 ~150 μm、搅拌强度为150 r/min、终点pHe值为1.3、温度为 95 ℃的条件下，浸出镁质矿3 h，镍、镁、铁的浸出率分别为93.34%、78.28%、26.4%；在沉矾浸出过程中，在反应温度为95 ℃、搅拌强度为150 r/min、硫酸钠中的钠与形成黄钠铁矾中的钠的摩尔比x为1.3、镁质矿粒度为106 ~150 μm、反应终点pHe为1.3±0.2的条件下，沉矾浸出5 h，镍浸出率能达到92%，镁浸出率在74%以上，铁质矿浸出液除铁率达到87%以上，铁质矿浸出液中铁的浓度在15.87~42.16 g/L的范围内，对镁质矿的镍、镁浸出及铁质矿浸出液中Fe的浓度没有显著的不利影响，溶液中铁基本上控制在4 g/L以下。
关键字: 过渡层；红土镍矿；镁质矿；镍的浸出率；黄钠铁矾沉淀
garnierite of transition layer nickel laterite ores
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. Jinchuan Group Ltd. Co., Jinchang 737100, China）
Abstract:Garnierite was leached with pregnant solution of leaching limonitic by Na-jarosite precipitation. The results show that, during the process of leaching garnierite with acid, the leaching rates of Ni, Mg and Fe are 93.34%, 78.28% and 26.4% under the conditions of garnierite ore size between 106 μm and 150 μm, end pH of leaching 1.3, leaching time 3 h, temperature 95 ℃ and stirring rate 150 r/min. During the process of leaching garnierite with pregnant solution of leaching limonitic, the leaching recoveries of Ni and Mg are 92% and above 74%, respectively, when the molar ratio of Na of sodium sulfate added to that of Na-jarosite precipitation is 1.3. Fe removal efficiency is more than 87%. When Fe concentration is 15, .87−42.16 g/L, there is little effect on leaching recoveries of Ni and Mg. Moreover, Fe concentration is almost less than 4 g/L.
Key words: transition layer; nickel laterite ores; garnierite, nickel leaching rate; Na-jarosite precipitation
