(1. 中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083；2. 金川集團(tuán)有限公司，金昌 737100)
摘 要: 采用沉礬浸出法將鐵質(zhì)礦浸出液對鎂質(zhì)礦進(jìn)行沉礬浸出。結(jié)果表明：鎂質(zhì)礦酸浸過程中，在鎂質(zhì)礦粒度為106 ~150 μm、攪拌強(qiáng)度為150 r/min、終點(diǎn)pHe值為1.3、溫度為 95 ℃的條件下，浸出鎂質(zhì)礦3 h，鎳、鎂、鐵的浸出率分別為93.34%、78.28%、26.4%；在沉礬浸出過程中，在反應(yīng)溫度為95 ℃、攪拌強(qiáng)度為150 r/min、硫酸鈉中的鈉與形成黃鈉鐵礬中的鈉的摩爾比x為1.3、鎂質(zhì)礦粒度為106 ~150 μm、反應(yīng)終點(diǎn)pHe為1.3±0.2的條件下，沉礬浸出5 h，鎳浸出率能達(dá)到92%，鎂浸出率在74%以上，鐵質(zhì)礦浸出液除鐵率達(dá)到87%以上，鐵質(zhì)礦浸出液中鐵的濃度在15.87~42.16 g/L的范圍內(nèi)，對鎂質(zhì)礦的鎳、鎂浸出及鐵質(zhì)礦浸出液中Fe的濃度沒有顯著的不利影響，溶液中鐵基本上控制在4 g/L以下。
關(guān)鍵字: 過渡層；紅土鎳礦；鎂質(zhì)礦；鎳的浸出率；黃鈉鐵礬沉淀
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
