高冰镍浸出渣还原浸出工艺研究  

Study on Reduction Leaching Process of High Nickel Matte Leaching Residue

作　　者：金鑫 邓志敢[1] 于睿 周宣通 徐红江 魏昶[1] 蒋光德 JIN Xin;DENG Zhigan;YU Rui;ZHOU Xuantong;XU Hongjiang;WEI Chang;JIANG Guangde(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;Shengtun Energy Metal Chemistry(Guizhou)Co.,Ltd.,Fuquan 550508,Guizhou,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,昆明650093 [2]盛屯能源金属化学(贵州)有限公司,贵州福泉550508

出　　处：《有色金属（冶炼部分）》2024年第2期8-15,共8页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51964029);昆明理工大学校企合作项目(KKF0202352055)。

摘　　要：以湿法冶炼高冰镍过程中产生的高冰镍浸出渣为研究对象,采用二氧化硫对高冰镍渣加压还原浸出,考察了初始硫酸浓度、液固比、通气方式、浸出温度和浸出时间对高冰镍渣还原浸出过程铜、铁行为的影响;对还原浸出液采用置换沉淀和冷冻结晶的方法,对还原浸出中铜和铁进行分离回收。结果表明:在初始硫酸浓度100 g/L、液固比6 mL/g、反应时间3 h、反应温度90℃、二氧化硫分压0.15 MPa的条件下,铁和铜的浸出率分别为99.35%、77.46%,浸出液中铁几乎全部为亚铁离子;在硫酸含量20~30 g/L、温度70℃、铁粉加入量5.7 g/L、反应时间40 min的条件下,对还原浸出液进行置换沉铜,沉铜率达到了99.70%,渣含铜为67.91%。在温度—10℃、保温时间20~30 min、初始硫酸浓度100 g/L的条件下,对沉铜后液进行冷冻结晶制备硫酸亚铁,铁沉淀率达到了72.6%,七水硫酸亚铁纯度达到了92.93%。In order to achieve the purpose of resource utilization of high nickel matte leaching residue from hydrometallurgy process of the high nickel matte,the reduction leaching behavior of copper and iron in high nickel matte residue under the action of sulfur dioxide was studied.The effects of initial sulfuric acid concentration,liquid-solid ratio,ventilation,leaching temperature,and leaching time on reduction leaching behavior of high nickel matte residue were investigated.The methods of displacement precipitation and freezing crystallization were used to separate and recover copper and iron from the reduction leaching solution.The experimental results show that under the conditions of initial sulfuric acid concentration of 100 g/L,liquid-solid ratio of 6 mL/g,reaction time of 3 h,reaction temperature of 90℃,sulfur dioxide partial pressure of 0.15—0.2 MPa,the leaching rates of iron and copper are 99.35% and 77.46% respectively,and iron in the leaching solution is almost all ferrous ions.Under the conditions of sulfuric acid content of 20—30 g/L,temperature of 70℃,iron powder addition of 5.7 g/L,and reaction time of 40 min,the copper precipitation rate from reduction leaching solution reaches 99.70% and the copper content in slag is 67.91%.Finally,ferrous sulfate was prepared by freezing crystallization of the liquid after copper deposition.Iron precipitation rate is 72.6% and the purity of ferrous sulfate heptahydrate is 92.93% under the conditions of temperature of—10℃,holding time of 20—30 minutes,and initial sulfuric acid concentration of 100 g/L.

关 键 词：高冰镍渣 还原浸出 置换沉铜 冷冻结晶 

分 类 号：TF815[冶金工程—有色金属冶金]