摘要
含钛高炉渣高温碳化后的碳化渣全铁(TFe)含量为2.0%~3.5%,用于低温氯化工艺生产钛白粉时,渣中铁与氯气反应生成氯化铁,导致低温氯化淋洗系统堵塞,影响系统的稳定运行,因此本文针对碳化渣进行了工艺矿物学和除铁试验研究,为渣中铁含量控制提供参考。工艺矿物学研究发现,碳化渣主要由硅酸盐玻璃、碳化钛、金属铁、铁氧化物等物相组成,其中硅酸盐玻璃含量为85.71%,碳化钛含量为11.53%,金属铁含量为0.87%,铁氧化物含量为0.53%。金属铁呈圆球状或椭球状嵌布在硅酸盐玻璃中,嵌布粒度粗细不均,一半以上分布在0.08~0.32 mm之间;碳化钛(TiC)主要分布于硅酸盐玻璃相中,并与金属铁等物相连生,粒度主要集中在0.01 mm以下;铁氧化物粒度主要集中在0.04 mm以下。对碳化渣开展湿式磁选除铁试验,结果表明提高磁场强度和增加研磨时间有利于渣中TFe的去除,但也会带来碳化钛(TiC)收得率的降低,当磁场强度达到3000 Gs、研磨时间超过15 min时,尾矿中TFe含量可降低至1.50%以下,满足低温氯化原料的要求。在实际生产中,可根据生产需要选择不同磁场强度和研磨时间,在有效控制渣中TFe含量的同时,尽量减少碳化钛(TiC)损失。
The total iron(TFe)content of carbide slag is 2.0%-3.5%,when used in the low-temperature chlorination process to produce titanium dioxide,the iron in the slag reacts with chlorine gas to form ferric chloride,which blocks the low-temperature chlorination rinsing system and affects the stability and smooth operation of the system.Therefore,this paper conducted process mineralogy and iron removal experiments on carbide slag to provide a reference for the control of iron content in slag.Through the study of process mineralogy,it was found that carbide slag is mainly composed of silicate glass(85.71%),titanium carbide(11.53%),metallic iron(0.87%),and iron oxide(0.53%).Metallic iron is embedded in silicate glass in a spherical or ellipsoidal shape.Its particle size distribution is uneven,more than half distributed between 0.08 mm and 0.32 mm;TiC is mainly distributed in the silicate glass phase and coexists with metal iron and other substances.Its particle size is primarily below 0.01 mm;The particle size of iron oxide is primarily below 0.04 mm.Wet magnetic separation experiments were conducted to remove iron from carbide slag.The results showed that increasing the magnetic field intensity and grinding time was beneficial for the removal of TFe from the slag,but also resulted in a decrease in the recovery of TiC.When the magnetic field intensity reaches 3000 Gs and the grinding time is more than 15 min,the TFe content in the tailings is reduced to less than 1.50%,which meets the requirements for low temperature chlorination raw materials.In the actual production,different magnetic field intensities and grinding times can be selected according to the production needs to control the TFe content in the slag while minimizing the TiC loss.
作者
吕学明
肖波
赵青娥
路瑞芳
郭文明
肖虎
LYU Xueming;XIAO Bo;ZHAO Qing′e;LU Ruifang;GUO Wenming;XIAO Hu(State Key Laboratory for Comprehensive Utilization of Vanadium and Titanium Resources,Panzhihua 617000,China;Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,China;Panzhihua Juti Technology Co.,Ltd.,Pangang Group,Panzhihua 617000,China)
出处
《中国有色冶金》
北大核心
2026年第1期85-91,共7页
China Nonferrous Metallurgy
基金
中央在川高校院所重大科技成果转化项目(2022ZHCG0123)。
关键词
含钛高炉渣
高温碳化
低温氯化
碳化渣
工艺矿物学
TFe含量
磁场强度
研磨时间
titanium-bearing blast furnace slag
high-temperature carbonization
low-temperature chlorination
carbide slag
process mineralogy
total iron content
magnetic field intensity
grinding time
