红土镍矿中镁橄榄石在高浓度氢氧化钠中的浸出过程  

LEACHING PROCESS OF THE FORSTERITE IN NICKEL LATERITE ORES BY CONCENTRATED SODIUM HYDROXIDE

作　　者：赵昌明[1,2] 翟玉春[2] 李军丽[1] 宁志强[2] 张崇民[1] 

机构地区：[1]辽宁科技大学材料冶金学院,辽宁鞍山114051 [2]东北大学材料冶金学院,辽宁沈阳110004

出　　处：《矿物岩石》2014年第2期28-32,共5页Mineralogy and Petrology

基　　金：国家重点基础研究发展计划(2007CB613603);国家自然科学基金(51204037)

摘　　要：根据红土镍矿中镁橄榄石的存在形式,采用高温固相法合成Mg2SiO4,通过正交试验优化Mg2SiO4在高浓度氢氧化钠中的浸出过程,利用XRD对浸出反应渣进行物相分析,探讨了液固比、氢氧化钠浓度、反应时间和反应温度对Mg2SiO4中SiO2的浸出率的影响。结果表明:Mg2SiO4在高浓度氢氧化钠中浸出过程优化实验条件为,反应温度220℃,反应时间120min,液固比6∶1,NaOH浓度85%;浸出反应渣的XRD分析结果表明:NaOH介入硅酸盐晶格中,其中间产物为Na2MgSiO4,Mg2+经过碱熔融过程可以脱离SiO4阵列,以Mg(OH)2形式从其硅酸盐中得以释放。Based on the formation of the forsterite in nickel laterite ores,Mg2SiO4 was finely pre pared by high temperature solid state method. The leaching process of Mg2SiO4 in concentrated NaOH was optimized by orthogonal experiment. X-ray diffractometer analysis was used to test water leaching residue after the alkali melting process. The effects of liquid to solid ratio, the NaOH concentration,reaction time and temperature on the silica leaching rate in Mg2SiO4 were investigated. The results show that the optimal melting experimental conditions of MgzSiO4 in high concentration NaOH are obtained with reaction temperature of 220 ℃, reaction time of 120 min, liquid to solid ratio of 6：1 and the NaOH concentration of 85 %. The NaOH inserts itself into the silicate lattice, producing an intermediate Na2MgSiO4 product. After the alkali melting, Mg^2＋ can separate from the SiO4 array,which can be released out of the silicate in the form of Mg （OH）2.

关 键 词：镁橄榄石 红土镍矿 高浓度NaOH 浸出 矿物加工工程 

分 类 号：TQ170.1[化学工程—硅酸盐工业]