摘要
基于低品位硫化镍矿的还原活性和大洋多金属结核的氧化活性,提出复杂低品位多金属矿的耦合酸浸处理工艺。主要考察Mn与S矿石质量比、硫酸浓度、温度对主金属元素浸出的影响,并采用XRD和SEM-EDS及电化学极化、循环伏安等分析耦合酸浸处理过程中主金属元素的浸出特性。研究结果表明:在最佳条件即Mn与S矿石质量比为0.55、初始硫酸浓度为1.3 mol/L、温度为355 K时,Ni,Mn,Cu,Co和Fe的浸出率分别为96.8%,97.3%,92.2%,97.9%和28.9%;金属硫化物还原MnO_2而溶出结核中Ni,Cu和Co,同时自身被氧化腐蚀成S0,SO_4^(2-)和金属离子而溶解;将Fe以铁矾或氧化矿物形式沉淀在渣相中,选择性浸出Ni,Mn,Cu和Co可行;耦合酸浸工艺利用矿石的氧化还原活性,实现了不同类型的复杂低品位矿石中有价金属的高效提取。
A coupled leaching process of low-grade sulfide ore and polymetallic nodules in sulfuric acid solution was proposed according to the reduction performance of the former and the oxidation activity of the latter.The effects of mass ratio of Mn and S ore,sulfuric acid concentration and temperature on leaching efficiencies of the main metal elements were investigated.The leaching characteristics of the main metallic minerals were measured by X-ray,scanning electron microscope,energy dispersion spectrum,electrochemical polarization and cyclic voltammetry.The results show that in the optimal conditions of coupled leaching,i.e.temperature is 355 K,the mass ratio of Mn and S ore is 0.55,H2SO4 concentration is 1.3 mol/L,the extraction ratios of Ni,Mn,Cu,Co and Fe are 96.8%,97.3%,92.2%,97.9%and 28.9%,respectively.Ni,Cu and Co are released owing to the reduction of MnO2 by sulfide.The metal-containing sulfide minerals are simultaneously oxidized to S0,SO4 2?and metallic ions,and are finally dissolved.Fe element can be precipitated in the slag phase in the form of oxide or jarosite,which can provide a feasible way for the selective leaching of Ni,Cu,Co and Mn.The coupled leaching using oxido-reduction activity is an efficient process to extract valuable metal from low-grade and intractable ores.
作者
冯雅丽
康金星
李浩然
杜竹玮
邓祥意
王洪君
FENG Yali;KANG Jinxing;LI Haoran;DU Zhuwei;DENG Xiangyi;WANG Hongjun(School of Civil and Resource Engineering,University of Science and Technology,Beijing 100083,China;Key State Laboratory of Biochemical Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第7期1582-1589,共8页
Journal of Central South University:Science and Technology
基金
水体污染与治理科技重大专项(2015ZX07205-003)
中国大洋矿产资源研究计划项目(DY 125-15-T-08)
国家自然科学基金资助项目(21176026
21176242)~~
关键词
多金属结核
低品位硫化镍矿
耦合浸出
极化
循环伏安
polymetallic nodules
low-grade nickel sulfide ore
coupled leaching
polarization
cyclic voltammetry
