Na_(2)CO_(3)对红土镍矿的H2还原影响规律与作用机理  

Influence law and mechanism of Na_(2)CO_(3)on H_(2)reduction of laterite nickel ore

作　　者：白亚东[1,2,3] 杨颂[1,2] 刘守军[1,2,3] 刘兴阳 齐升 BAI Ya-dong;YANG Song;LIU Shou-jun;LIU Xing-yang;QI Sheng(College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Engineering Center of Civil Clean Fuel,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学化学化工学院,太原030024 [2]太原理工大学山西省民用洁净燃料工程研究中心,太原030024 [3]太原理工大学煤科学与技术教育部和山西省重点实验室,太原030024

出　　处：《中国有色金属学报》2022年第9期2774-2786,共13页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(21878210)。

摘　　要：以红土镍矿为研究对象,重点考察添加Na_(2)CO_(3)对红土镍矿的H_(2)还原影响规律。对还原焙烧矿物采用X射线衍射(XRD)、扫描电子显微镜(SEM)和热重−质谱联用(TG-MS)等技术进行表征。结果表明:在还原温度为1000℃,还原时间为90 min,H_(2)浓度为45%(体积分数),Na_(2)CO_(3)的添加量为15%(质量分数)时,可得镍品位为3.02%、镍回收率96.75%的精矿。Na_(2)CO_(3)对红土镍矿的修饰作用机理的本质为,Na_(2)CO_(3)中的Na+通过与红土镍矿中的Mg-Si-O以及Ni-Mg-O体系发生反应,取代全部Ni^(2+)以及部分Mg^(2+),从而破坏硅镍酸盐及硅镁酸盐的结构,进而使赋存于硅酸盐类中的镍元素被释放出来,有利于后续镍的富集提取。This article takes laterite nickel ore as the research object,and focuses on the influence of Na_(2)CO_(3)on the H_(2) reduction of laterite nickel ore.The reduced roasted minerals were characterized by X-ray diffractometry(XRD),scanning electron microscopy(SEM)and thermogravimetric mass spectrometry(TG-MS).The results show that,when the reduction temperature is 1000℃,the reduction time is 90 min,the H_(2) concentration is 45%(volume fraction),and the addition amount of Na_(2)CO_(3)is 15%(mass fraction),the available nickel grade is 3.02%,and the nickel recovery rate is 96.75%.The essence of the modification mechanism of Na_(2)CO_(3) on laterite nickel ore is that the ion Na^(+)in Na_(2)CO_(3) reacts with the Mg-Si-O and Ni-Mg-O system in laterite nickel ore to replace all of Ni^(2+) and part of Mg^(2+),which destroys the structure of nickel silicate and magnesium silicate,and then releases the nickel element that occurs in the silicate,which is conductive to subsequent enrichment and extraction.

关 键 词：红土镍矿 Na_(2)CO_(3) H_(2) 还原焙烧 机理 

分 类 号：TF11.31[冶金工程—冶金物理化学]