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采用XRF、XRD和金相显微镜分析含钛高炉渣的化学成分、物相组成和矿物形态,发现渣中含钛量高达20%,主要矿物相为钙钛矿、透辉石和镁铝尖晶石,各物相结合紧密、分布均匀。将Na_2CO_3与含钛高炉渣进行高温混合焙烧,焙烧熟料用去离子水进行水浸处理,以实现对含钛高炉渣中Si、Al组分的提取,同时实现对Ti组分的富集,达到分离三种有价组分的目的。通过研究焙烧温度、碱渣质量比和焙烧时间对组分浸取率的影响以及焙烧过程中矿物相的变化,结果表明:在焙烧过程中镁铝尖晶石先于透辉石与助剂Na_2CO_3发生反应,而钙钛矿不与Na_2CO_3发生反应。优化的焙烧条件为:焙烧温度900℃,碱渣质量比为2∶1,焙烧反应时间180 min,此条件下SiO_2和Al_2O_3的提取率分别达到47.52%和82.97%。
The chemical composition, phase composition and mineral morphology of the titanium-bearing blast furnace slag were analyzed by XRD, XRD and metallographic microscope. The results showed that the content of titanium in the slag was as high as 20%. The main mineral phases were perovskite, diopside and magnalium spinel , The combination of all things close, evenly distributed. The Na_2CO_3 and the titanium-bearing blast furnace slag are mixed and roasted at a high temperature, the roasted clinker is roasted with deionized water to achieve the extraction of the Si and Al components in the slag containing titanium, and at the same time, the Ti component is enriched, Achieve the purpose of separating three kinds of valuable components. The effects of calcination temperature, mass ratio of soda ash and calcination time on the leaching rate of the components and the change of mineral phase in the calcination process were studied. The results show that during the calcination process, magnesium aluminate spinel precedes diatomite and its additive Na_2CO_3 Reactions occur, whereas perovskites do not react with Na_2CO_3. The optimum calcination conditions were as follows: the calcination temperature was 900 ℃, the mass ratio of alkaline residue was 2:1 and the reaction time was 180 min. The extraction rates of SiO_2 and Al_2O_3 were 47.52% and 82.97% respectively.