碱浸提钛渣提硅实验过程及其动力学研究  

Experimental Process and Kinetics Research of Silicon Extraction from the Residue after Titanium Extraction by Alkali Leaching

作　　者：徐丽霜 隋丽丽[1] 葛欣[1] 翟玉春 邵爽 XU Li-shuang;SUI Li-li;GE Xin;ZHAI Yu-chun;SHAO Shuang(Department of Chemistry,Shenyang Medical College,Shenyang 110034,China;School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]沈阳医学院化学系,辽宁沈阳110034 [2]东北大学冶金学院,辽宁沈阳110819

出　　处：《稀有金属与硬质合金》2019年第4期20-23,43,共5页Rare Metals and Cemented Carbides

基　　金：国家自然科学基金(51204034);沈阳医学院科技发展基金(20186055);2018辽宁省大学生创新创业训练计划(201810164016);辽宁省教育厅科学研究一般项目(L2015539)

摘　　要：硫酸氢铵焙烧高钛渣提钛后的滤渣中存在大量的硅,对苛刻碱浸渣提硅实验过程中各参数的影响进行系统的研究。结果表明:在反应温度220℃,苛性碱与浸出渣质量比为3.5∶1,液固比5.5∶1,反应时间50 min,搅拌速度400 r/min的实验条件下,SiO2提取率可达78.4%。碱浸过程动力学分析表明此反应过程受内扩散控制,反应的表观活化能为24.047 kJ/mol,动力学方程为:1+2(1-x)-3(1-x)^2/3=2.415exp[-24 047/(RT)]·t。A large amount of silicon exists in the residue after titanium extraction from titanium-rich residue by ammonium bisulfate roasting.The effects of various parameters in the experimental process of extracting silicon from the residue after caustic alkali leaching are systematically studied.The results show that SiO2 extraction rate can reach 78.4%under the experimental conditions of reaction temperature of 220℃,mass ratio of caustic alkali to residue of 3.5∶1,liquid-solid ratio of 5.5∶1,reaction time of 50 min and stirring speed of 400 r/min.The alkali leaching kinetic analysis results show that the reaction process is controlled by internal diffusion.The apparent activation energy of the reaction is 24.047 kJ/mol,and the kinetics equation can be expressed as 1+2(1-x)-3(1-x)^2/3=2.415 exp[-24 047/(RT)]·t.

关 键 词：高钛渣 苛性碱浸出 提硅 动力学 内扩散 工艺条件 

分 类 号：TF09[冶金工程—冶金物理化学]