摘要
在钒钛磁铁矿高炉冶炼工艺中产生了大量的含钛高炉渣,然而由于缺少相对应的活度等热力学数据,导致了钛资源的回收利用不够充分。因此,依据分子离子共存理论,建立了CaO-SiO2-Al2O3-TiO2渣系活度计算模型并采用Matlab计算软件进行求解,通过活度计算值以及选择性析出和富集技术的方法,选择CaO·TiO2相作为钛组分的富集相,通过调整成分或者温度等,使CaO·TiO2相活度增大,同时将SiO2和Al2O3等物质富集到非富钛相中,并最终实现钛组分的选择性分离。结合Factsage热力学软件计算了含钛渣系相图和不同温度下的液相区分布,分析了钙钛矿CaO·TiO2相、硅酸二钙2CaO·SiO2相和黄长石2CaO·Al2O3·SiO2相等物相在1600℃下的等活度图。结果表明,在典型钛渣成分的基础上适当增加碱度可以有效的实现钛组分在CaO·TiO2相中的富集,而使其它非钛成分富集于2CaO·SiO2相和2CaO·Al2O3·SiO2相中,从而实现CaO·TiO2富钛相的有效分离。
The Ti-containing slag,which is produced by the smelting process for V-Ti-Fe ore,has not been sufficient recovered until now due to the lack of related thermodynamic data.Therefore,the activity model was established by the molecular-ion coexisting theory for CaO-SiO2-Al2O3-TiO2 slag system,and calculated by Matlab software.Based on the calculated results and the concept of selective precipitation and enrichment technique,it was proved that CaO·TiO2 phase could be selected as a candidate to enrich the Ti element by adjusting composition and temperature,and SiO2,Al2O3 could be enriched to other non-Ti containing phases at the same time.In combination with the phase diagram calculated by Factsage software,the activity of CaO·TiO2,2 CaO·SiO2,2CaO·Al2O3·SiO2 phases at 1600℃were plotted and systematic analyzed.The results indicated that with the reference to typical composition of Ti-containing slag,the activity of CaO·TiO2 phase increased with the increase of basicity,which was favorable for the enrichment of Ti element in CaO·TiO2 phase,and other elements into 2CaO·SiO2 and 2CaO·Al2O3·SiO2 phases,realizing the separation of Ti-containing phase.
作者
李松
郑雪梅
马爱元
朱山
潘东
彭文烽
Li Song;Zheng Xuemei;Ma Aiyuan;Zhu Shan;Pan Dong;Peng Wenfeng(School of Chemical and Materials Engineering,Liupanshui Normal University,Liupanshui 553004,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2020年第5期540-546,共7页
Chinese Journal of Rare Metals
基金
六盘水市科技局自然科学研究项目(52020-2018-04-14)
贵州省教育厅自然科学项目(黔教合KY字[2017]273,黔教合KY字[2017]270)
贵州省教育厅特色重点实验室项目(黔教高发:2011-278)
卓越工程师培养计划项目(LPSSYzyjypyjh201801)
六盘水师范学院重点学科项目(LPSSYZDPYXK201708,52020-2018-03-04)
六盘水师范学院科技创新团队项目(LPSSYKJTD201801,LPSSYKJTD201905)
六盘水市重点实验项目(52020-2019-05-09)
六盘水市科技创新团队项目(52020-2019-05-08)
全国大学生创新创业项目(201810977009)资助。
