Transformation and leaching kinetics of silicon from low-grade nickel laterite ore by pre-roasting and alkaline leaching process  

低品位红土镍矿预焙烧-碱浸过程中硅的转化和浸出动力学（英文）

作　　者：Wen-ning MU Xiu-yuan LU Fu-hui CUI Shao-hua LUO Yu-chun ZHAI 牟文宁;陆修远;崔富晖;罗绍华;翟玉春(东北大学秦皇岛分校资源与材料学院,秦皇岛066004;秦皇岛市资源清洁转化与高效利用重点实验室,秦皇岛066004;东北大学冶金学院,沈阳110819)

机构地区：[1]School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China [2]Key Laboratory of Resources Cleaner Conversion and Efficient Utilization at Qinhuangdao City,Qinhuangdao 066004, China [3]School of Metallurgy, Northeastern University, Shenyang 110819, China

出　　处：《Transactions of Nonferrous Metals Society of China》2018年第1期169-176,共8页中国有色金属学报（英文版）

基　　金：Project(2014CB643405) supported by the National Basic Research Program of China;Projects(51204036,51234009) supported by the National Natural Science Foundation of China;Project(BJ201604) supported by the Program for Top Young Talents of Higher Education Institutions of Hebei Province,China

摘　　要：The mineralogical phase transformation of a low-grade nickel laterite ore during pre-roasting process and the extraction of silicon during alkaline leaching process were investigated.The results indicate that the reaction activity of nickel ores is effectively improved by pre-roasting at650°C for2h,because of the transformation of lizardite into magnesium olivine and protoenstatite.When finely ground ore samples(44-61μm)pre-roasted firstly react with sodium hydroxide solution(60g/L)with a solid/liquid ratio of1:5at140°C for120min,the extraction of silicon can reach89.89%,and the other valuable elements of magnesium,iron and nickel are accumulated in the solid residues.The leaching kinetics of nickel laterite ore can be described successfully by the diffusion through the product layer control model.The activation energy is calculated to be11.63kJ/mol and the kinetics equation can be expressed as1-3(1-x)2/3+2(1-x)=13.53×10-2exp[-11.63/(RT)]t.研究低品位红土镍矿预焙烧过程矿相的转化和碱浸过程硅的提取。结果表明,红土镍矿经650°C预焙烧2 h,由于利蛇纹石转化为镁橄榄石和原顽辉石使得矿物的活性显著提高,当磨细矿样(44~61μm)经预焙烧后,与氢氧化钠溶液(60 g/L)按照1:5的固液比混合在140°C浸出120 min,硅的提取率可达到89.89%,镁、铁、镍等有价元素在固体渣中得到富集。红土镍矿的浸出动力学可由扩散通过产物层控制模型来描述,计算得到过程的活化能为11.63 k J/mol,动力学方程为1-3(1-x)^(2/3)+2(1-x)=13.53×10^(-2)exp[-11.63/(RT)]t。

关 键 词：low-grade nickel laterite ore silicon extraction mineralogical phase transformation alkaline leaching kinetics 

分 类 号：TF046.2[冶金工程—冶金物理化学] TQ127.2[化学工程—无机化工]