低品位高钛渣中钛组分制备金红石(英文)

Synthesis of rutile from high titania slag by pyrometallurgical route

介绍了以70%～75%TiO2的低品位高钛渣为原料制备人造金红石的分离工艺。低品位高钛渣中MgO,FeO,CaO,Al2O3和SiO2进入杂质相,钛组分进入金红石相,金红石相中TiO2品位达到90%～95%,可满足流态化氯化对杂质的要求。1050℃的低温预氧化与1510℃的高温热处理促使渣中分散于各矿物相的钛组分选择性转移并富集于金红石相,金红石相析出与长大,用稀硫酸和稀盐酸实现金红石相的分离。实验结果表明,金红石矿物相平均晶粒度可以达到25μm,通过稀酸选择性浸出改性渣,可以获得95%TiO2品位的人造金红石。

A new technique was developed for the conversion of high titania slag,containing 70%-75% TiO2 and with MgO,FeO,CaO,Al2O3 and SiO2 as main impurities,into a synthetic rutile,90%-95% TiO2,which satisfies the requirements for fluidizing chlorination process with respect to impurity contents.After a pre-oxidation at around 1 042 ℃ and a heat-treatment above 1 510 ℃,the Ti components in high titania slag can be enriched into the rutile phase which can precipitate and grow,and can be separated with dilute hydrochloric and sulfuric acid,respectively.The results show that the average crystal size of rutile phase is over 25 μm,and the synthetic rutile containing more than 95% TiO2 can be produced by selective leaching.