酸溶性钛渣硅热还原制备高硅Ti-Si基合金的试验研究  

Experimental study on the preparation of high silicon Ti-Si based alloy by silicothermic reduction of acid-soluble titanium slag

作　　者：曹丽 朱奎松 王军 赵英涛 孙常清 马兰 程相利 CAO Li;ZHU Kuisong;WANG Jun;ZHAO Yingtao;SUN Changqing;MA Lan;CHENG Xiangli(Vanadium and Titanium Resource Comprehensive Utilization Key Laboratory of Sichuan Province,Panzhihua 617000,China;College of Vanadium and Titanium,Panzhihua University,Panzhihua 617000,China;State Key Testing Laboratory of Vanadium&Titanium,Panzhihua 617000,China)

机构地区：[1]钒钛资源综合利用四川省重点实验室,四川攀枝花617000 [2]攀枝花学院钒钛学院,四川攀枝花617000 [3]国家钒钛检测重点实验室,四川攀枝花617000

出　　处：《中国有色冶金》2024年第6期30-40,共11页China Nonferrous Metallurgy

基　　金：四川省应用基础研究项目(2021YJ0548);四川省钒钛材料工程技术研究中心开放课题(2023FTGC09);“工业固态废弃物土木工程综合开发利用”四川省高校重点实验室开放课题(FQWLY-2023-Y-06);太阳能技术集成及应用推广四川省高校重点实验室开放课题(TYNSYS-2023-Y-01)。

摘　　要：攀西钛精矿电弧炉冶炼产出的酸溶性钛渣具有钛品位低及高镁低钙的特性,目前主要应用于硫酸法制备钛白粉;为延伸攀枝花钛产业结构,本文以该酸溶性钛渣为原料,采用硅热还原法进行了Ti-(55~70)wt.%Si合金制备试验,并分析了不同试验方案的渣金分离效果和影响因素,以及合金产物的微观组织结构形貌和金属元素分布规律。结果表明,在考虑合金过热度和密度条件下,Ti-60wt.%Si合金熔体渣金分离效果最好;合金组织中最主要的物相为Si相、TiSi_(2)相、TiFeSi_(2)相和Ti(Fe,Mn)Si_(2)相;最佳合金分离效果下,得到的实际合金成分为Ti-56.29wt.%Si-6.6wt.%Fe-0.41wt.%Mn;Ti、Fe、Si和Mn的回收率分别为:89.8%、93.5%、92.1%和94.4%。酸溶性钛渣经硅热还原后得到实际合金成分趋向于亚共晶Ti-(51.4~67.17)wt.%Si,能够为电磁定向凝固分离制备C54-TiSi_(2)提供原料,因此,该工艺开展能够拓展酸溶性钛渣的用途,将酸溶性钛渣的应用向钛产业链下端拓展。The acid-soluble titanium slag produced by arc furnace smelting of Panxi ilmenite concentrate has the characteristics of low titanium grade,high magnesium and low calcium.At present,it is mainly used in the preparation of titanium dioxide by sulfuric acid method.In order to extend the industrial structure of Panzhihua titanium,the preparation of Ti-(55~70)wt.%Si alloy was carried out by silicothermic reduction method with the acid-soluble titanium slag as raw material.The slag-metal separation effect and influencing factors of different test schemes were analyzed,as well as the microstructure morphology and metal element distribution of the alloy products.The results show that the slag-metal separation effect of Ti-60wt.%Si alloy melt is the best under the condition of considering alloy superheat and density.The main phases in the alloy are Si phase,TiSi_(2)phase,TiFeSi_(2)phase and Ti(Fe,Mn)Si_(2)phase.Under the best alloy separation effect,the actual alloy composition obtained is Ti-56.29wt.%Si-6.6wt.%Fe-0.41wt.%Mn;the recovery of Ti,Fe,Si and Mn is 89.8%,93.5%,92.1%and 94.4%,respectively.The actual alloy composition of acid-soluble titanium slag after silicothermic reduction tends to be hypoeutectic Ti-(51.4~67.17)wt.%Si,which can provide raw materials for the preparation of C54-TiSi_(2)by electromagnetic directional solidification separation.Therefore,this process can expand the use of acid-soluble titanium slag and expand the application of acid-soluble titanium slag to the lower end of the titanium industry chain.

关 键 词：酸溶性钛渣 硅热还原 高硅Ti-Si基合金 渣金分离 微观组织结构 钛产业链 C54-TiSi_(2) 

分 类 号：TF125.2[冶金工程—粉末冶金] TF823[冶金工程—冶金物理化学]