摘要
以含钛高炉渣为原料,经硫酸铵熔融法得到含钛滤液,然后以氨水为沉淀剂,控制pH值使钛水解,水解产物经600℃煅烧2h得到二氧化钛。考察了螯合剂的加入量、溶液pH值和反应时间对钛沉淀率的影响,实验结果表明:反应过程中铁与钛发生共沉淀,造成二氧化钛产物中的铁含量过高。EDTA几乎完全抑制了铁的沉淀,明显降低了二氧化钛产物的全铁含量;2-羟基丙烷-1,2,3-三羧酸的加入降低了产物中二氧化硅的含量,提高了产物中二氧化钛的含量。当2-羟基丙烷-1,2,3-三羧酸与硅的摩尔比为1,EDTA与铁的摩尔比为3,pH值为2.0,反应时间为90min时产物中二氧化钛的含量为96.35%。
Extraction of titanium dioxide from titanium-bearing blast furnace slag was studied.Firstly,the titanium-bearing blast furnace slag reacted with ammonium sulfate to obtain NH3 and TiOSO4 solution,and then titanium dioxide was precipitated from TiOSO4 solution by using ammonium as precipitant.Finally,the filtered precipitate was calcined in a muffle furnace at 600℃ for 2 h.The effects of quantities of chelate reagent added,pH and holding time on the precipitation rate of titanium were investigated.The results showed that the precipitation rate of titanium,aluminum and iron increased with increasing solution pH since NH3 was used as precipitant and during this stage iron ion hydrolyzed to form Fe（OH）3.The hydrolysis of Fe3＋ was restrained by EDTA addition into the solution.At the same time,the content of iron in production decreased and the content of TiO2 increased.The precipitation of silicon was restrained by citric acid（a novel additive）addition into the solution.At the same time,the content of silicon dioxide in production decreased and the content of TiO2 increased.The TiO2 content of the production increased with increasing EDTA/Fe3＋ molar ratio.TiO2 with purity 96.35% was obtained when EDTA/Fe3＋ molar ratio increased to 3,citric acid /Si molar ratio was 1,solution pH was 2.0 and holding time was 90 min.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2012年第10期3345-3349,共5页
CIESC Journal
关键词
含钛高炉渣
二氧化钛
水解
沉淀
titanium-bearing blast furnace slag
titanium dioxide
hydrolysis
precipitation
作者简介
联系人及第一作者：张悦（1982-），男，博士，工程师。
