Co-extraction of valuable metals and kinetics analysis in chlorination process of low-grade nickel-copper sulfide ore  

低品位镍铜硫化矿氯化焙烧同步提取有价金属及过程的动力学

作　　者：Wen-ning MU Teng-fei XIAO Shuang-zhi SHI Xue-qing XU Hao CHENG Yu-chun ZHAI 牟文宁;肖腾飞;石双志;徐雪晴;程皓;翟玉春(东北大学秦皇岛分校资源与材料学院,秦皇岛066004;东北大学材料科学与工程学院,沈阳110819;东北大学冶金学院,沈阳110819;通用电气−哈动力−南汽轮能源服务(秦皇岛)有限公司,秦皇岛066000)

机构地区：[1]School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China [2]School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [3]School of Metallurgy,Northeastern University,Shenyang 110819,China [4]GE-HPEC-NTC Energy Services(Qinhuangdao)Co.,Ltd.,Qinhuangdao 066000,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第6期2033-2045,共13页中国有色金属学报（英文版）

基　　金：the National Natural Science Foundation of China(No.52074069);the Natural Science Foundation of Hebei Province(No.E2020501022);the National Basic Research Program of China(No.2014CB643405);the Fundamental Research Funds for the Central Universities,China(No.N2223027)。

摘　　要：To efficiently co-extract Ni and Cu from low-grade nickel-copper sulfide ore,chlorination roasting with NH;Cl followed by a water leaching process was investigated.The results show that 98.4%Ni and 98.5%Cu can be synchronously extracted when the ore particle size is 75-80μm,the roasting time is 2 h,the mass ratio of NH;Cl to ore is 1.6:1 and the roasting temperature is 550°C.The evolution behavior of various minerals was elucidated using X-ray diffraction(XRD)coupled with scanning electron microscopy(SEM).The kinetics of the chlorination process based on the differential thermal and thermogravimetric analysis(DTA-TG)data was analyzed by Kissinger method and Flynn-Wall-Ozawa(FWO)method.The chlorination process of low-grade nickel-copper sulfide ore mainly contains two stages:the decomposition of NH;Cl and the chlorination of ore.The maximum apparent activation energies(Ea)at two stages are determined to be 114.8 and 144.6 kJ/mol,respectively.The condensed product of exhaust gas is determined to be ammonium chloride,which can be recycled as the reactant again,making the process economic and clean.研究低品位镍铜硫化矿氯化铵氯化焙烧-水浸工艺高效同步提取镍和铜。结果表明,当矿粉粒度为75~80μm,焙烧时间为2 h,氯化铵与矿的质量比为1.6:1,焙烧温度为550℃时,可同步提取98.4%的镍和98.5%的铜。采用X射线衍射(XRD)结合扫描电子显微镜(SEM)分析各种矿物的演化行为。通过Kissinger法和Flynn-Wall-Ozawa(FWO)法处理差热-热重分析(DTA-TG)数据,研究氯化过程动力学。结果表明,低品位镍铜硫化矿的氯化过程主要包括NH4Cl的分解和矿物的氯化两个阶段,最大的表观活化能(Ea)分别为114.8kJ/mol和144.6 kJ/mol。废气经冷凝回收确定为氯化铵,可作为反应物再次利用,实现工艺的经济性和清洁性。

关 键 词：low-grade nickel-copper sulfide ore chlorination roasting synchronous extraction phase evolution KINETICS 

分 类 号：TF803[冶金工程—有色金属冶金]