摘要
提出低温NH_(4)HSO_(4)焙烧—水浸工艺从金川镍精矿中同步提取Ni、Cu和Co,并系统研究硫酸化焙烧和水浸出过程中一些因素对金属提取的影响。结果表明,在优化的焙烧和水浸条件下,95.7%Ni、98.9%Cu和96.8%Co被提取。利用TG-DTA、XRD、SEM和EDS等手段分析矿相的转化机理,在NH_(4)HSO_(4)及其分解的SO_(3)和NH3的硫酸化反应下,有价金属被转化为水溶性金属—铵配合物从而得到有效的提取。通过提高浸出温度使铁离子与铵离子结合形成NH_(4)[Fe_(3)(SO_(4))_(2)(OH)_(6)]沉淀可除去浸出液中的杂质铁。在焙烧过程中收集的挥发物为(NH_(4))_(2)SO_(4)和(NH_(4))_(2)SO_(3),可用作硫酸化焙烧的试剂。
Low-temperature NH_(4)HSO_(4) roasting-water leaching process was proposed to extract Ni,Cu and Co from Jinchuan nickel concentrate simultaneously.The effects of some factors on the metal extraction in the process of sulfation roasting and water leaching were systematically investigated.The results showed that 95.7%Ni,98.9%Cu and 96.8%Co were extracted under optimized roasting and water leaching conditions.The transformation evolution of mineral phases was determined through the means of DTA-TG,XRD,SEM and EDS.The valuable metals were effectively extracted by being transformed to water-soluble metal-ammonium complexes under the sulfation reaction of NH_(4)HSO_(4) and decomposed SO3 and NH3.Iron impurities in the leach solution can be removed by elevating leaching temperature to combine iron ions with ammonium ions to form NH_(4)[Fe_(3)(SO_(4))_(2)(OH)_(6)]precipitate.The volatiles collected in the roasting process were determined to be(NH_(4))_(2)SO_(4) and(NH_(4))_(2)SO_(3),which can be used as reagents for sulfation roasting.
作者
杜守明
牟文宁
李丽莹
石树正
陈欢欢
雷雪飞
郭瑞
罗绍华
王乐
Shou-ming DU;Wen-ning MU;Li-ying LI;Shu-zheng SHI;Huan-huan CHEN;Xue-fei LEI;Rui GUO;Shao-hua LUO;Le WANG(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China;Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province,School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China;Key Laboratory of Resources Cleaner Conversion and Efficient Utilization Qinhuangdao City,Qinhuangdao 066004,China;College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China)
基金
supported by the National Natural Science Foundation of China (Nos. 52074069, 52174314)
the Natural Science Foundation of Hebei Province,China (Nos. E2020501022, E2022501030)
the Fundamental Research Funds for the Central Universities,China (Nos. N2223027, N2223009)
the Science and Technology Project of Hebei Education Department,China (Nos. ZD2021331)
Performance Subsidy Fund for Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province,China (No. 22567627H)。
关键词
镍精矿
NH_(4)HSO_(4)焙烧
同步提取
水浸出
矿相转化
nickel concentrate
NH_(4)HSO_(4) roasting
simultaneous extraction
water leaching
mineral phase transformation
