从相图分析含钛高炉渣选择性分离富集技术

Technical Analysis on Selective Separation and Enrichment of Ti-bearing Blast Furance Slag Based on Phase Diagrams

应用相图分析了含钛高炉渣选择性分离富集路线,并评估了各种方法的经济可行性。对于钙系选择性长大分离富集路线,将炉渣成分调整到CaSiO3-Ca3Si2O7-CaTiO3区域,可保证钙钛矿相的析出。由于各物相的密度差较小,重选并不适宜。另外,富集渣的后序处理难度大、成本高。对于钠系选择性分离富集路线,采用一步调渣法路线难以取得较高纯度的富钛渣。钢铁研究总院提出了二步调渣法分离富集路线,既可得到较高纯度的富钛渣,又可利用硅资源,还可循环利用钠资源,为我国含钛高炉渣的的综合利用提供了一条环境友好、循环高效利用的绿色废物综合利用新流程。

<Abstrcat>Technical and economical feasibilities on selective separation and enrichment of titanium containing BF slag were conducted. For the route of selective separation and enrichment with calcium oxide, perovskite separates out more sufficiently when slag composition is adjusted to the region CaSiO_3-Ca_3Si_2O_7-CaTiO_3. Gravity separation method is not suitable due to slight difference of phases' densities. Additionally, post-treatment of enrichment slag is very difficult and expensive. For the route of selective separation and enrichment with sodium oxide, it is very difficult for one-step route to produce quite pure enriched slag. Central Iron and Steel Research Institute invented two-step route, which could produce high quality enriched slag, utilize silicon resource and use sodium resource repeatedly. Therefore a high effective and green process comes into being for utilizing titanium slag comprehensively.