含钛钢渣在熔融NaOH体系中焙烧过程及其反应机理  

Reaction mechanism of titanium-bearing steel slag roasting in NaOH melt

作　　者：赵昌明[1] 宁哲[1] 张崇民 蔡永红 王一雍[1] 邵品 李继东[1] ZHAO Changming;NING Zhe;ZHANG Chongmin;CAI Yonghong;WANG Yiyong;SHAO Pin;LI Jidong(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China;Chengdu Iron&Steel Co.,Ltd.,Pangang Group,Panzhihua 617000,China)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [2]攀钢集团成都钢钒有限公司,四川攀枝花617000

出　　处：《中南大学学报（自然科学版）》2018年第12期2908-2914,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51674141;51174111;51604147);辽宁省教育厅项目(2016TSPY02;2016TSPY03);辽宁省化学冶金工程重点实验室开放课题基金资助项目(USTLKFSY201502);辽宁省科技厅项目(201602394;201602401)~~

摘　　要：针对高钙、高磷型含钛钢渣的特点,采用Na OH为焙烧剂,考察焙烧温度、焙烧时间、碱矿比对含钛钢渣在熔融Na OH体系中TiO2提取率的影响,并对焙烧过程动力学进行解析。研究结果表明:含钛钢渣在熔融Na OH体系中优化反应条件为焙烧温度450℃,碱矿比6:1,焙烧时间60min;当焙烧温度为350～500℃时,含钛钢渣在熔融Na OH体系中焙烧过程由内扩散控制,反应表观活化能E=10.77k J/mol,其动力学方程可描述为:1-2X/3-(1-X)2/3=1.239exp[-39.4/(RT)]t;含钛钢渣中主要物相Mg2TiO4,Mn Ti2O4和CaTiO3在熔融Na OH体系中焙烧过程中已完全分解,为后续钛的提取创造了有利条件。With consideration of the high content of calcium and phosphorus,titanium-bearing steel slag was roasted with NaOH to investigate the effects of roasting temperature,roasting time and mass ration of alkali-to-ore on the TiO2extraction rate.The kinetics of the roasting process were analyzed.The results show that the optimal conditions of titanium-bearing steel slag reacted with NaOH melt are as follows:roasting temperature450℃,alkali-to-ore ratio6:1and roasting time60min.The roasting process is found to be diffusion controlled at temperature of350-500℃.The apparent activation energy is10.77kJ/mol,and the kinetic equation can be described as follows:1-2X/3-(1-X)^2/3=1.239exp[-39.4/(RT)]t.The complete decomposition of the main phases(Mg2TiO4,MnTi2O4,CaTiO3)in titanium-bearing steel slag after roasting with NaOH has created favorable conditions for the extraction of titanium.

关 键 词：含钛钢渣 熔融 动力学 焙烧 

分 类 号：TF09[冶金工程—冶金物理化学]