摘要
钛是一种重要的战略资源,在废弃脱硝催化剂中钛含量远远高于我们常用的钛精矿。近年来,各种从废弃催化剂中回收钛新技术的发展,使得人们对钛回收过程水解工艺的研究更加重视。本文以废弃催化剂经过高温钠化焙烧后硫酸酸解得到的低浓度钛液为原料,采用常压自生晶种热水稀释水解工艺制备偏钛酸,通过对自生晶种常压水解工艺中影响钛液水解产品平均粒径的五个关键因素:钛液F值、水解温度、钛液初始浓度、熟化时间、搅拌速度进行正交设计,然后比较各因素的极差,最终得到影响水解产品偏钛酸粒径各因素主次关系如下:水解温度>钛液初始浓度>钛液F值>熟化时间>搅拌速度。然后采用单因素控制变量法,研究了水解温度、钛液初始浓度、钛液F值、熟化时间、搅拌速度对影响钛水解产品偏钛酸粒径的较佳条件。结果表明:在水解温度95℃,钛液初始浓度200 g/L,钛液F值为1.8,熟化时间在50 min,搅拌速度300 r/min时,得到的偏钛酸平均粒径更接近2 μm。
Titanium is an important strategic resource.Waste SCR catalysts are valuable source for extracting titanium because their concentrations of titanium are much higher than that in titanium concentrate.In recent years more attention has been paid to studying hydrolysis of titanium contained solution among various new technologies for recovering titanium from sodium roasted waste SCR catalysts.In the present study we have synthesized metatitanic acid,by adding autogenic seeds followed by dilution and hydrolysis with hot water at atmospheric pressure,from low-titanium contained solution that is obtained from sodium roasted waste SCR catalysts.From our designed orthogonal experiments it is found that the dependence degree of hydrolysis ratio on different processing parameters follows the order:hydrolysis temperature>concentration of titanium>acidity coefficient>the aging time>stirring speed.Optimal hydrolysis conditions have been obtained by varying one processing parameter while keep other parameters constant.Metatitanic acid particle size is close to 2µm when hydrolysis temperature is 95℃,concentration of titanium in the solution is 200 g/L,acidity coefficient of titanium is 1.8 and the aging time is 50 min,stirring speed is 300 r/min.
作者
梅其政
曾小义
史妮
王康宁
Mei Qizheng;Zeng Xiaoyi;Shi Ni;Wang Kangning(School of Power Engineering,Chongqing Electric Power College,Chongqing,China)
出处
《矿产综合利用》
CAS
北大核心
2020年第4期179-184,178,共7页
Multipurpose Utilization of Mineral Resources
基金
重庆市教委科研项目(DJQN201902602)。
关键词
废弃催化剂
钛液
水解
偏钛酸
Waste SCR catalyst
Titanium solution
Hydrolysis
Metatitanic acid
作者简介
通讯作者:梅其政(1980-),男,硕士,主要从事材料化学、催化剂材料制备和改性研究工作。
