中南大学学报（自然科学版）2023，Vol.54Issue(11)：4263-4272,10.DOI:10.11817/j.issn.1672-7207.2023.11.005
改性电炉钛渣酸解法制备沸腾氯化炉料新工艺研究
A novel process for preparation of boiling chlorinated charge from modified electric furnace titanium slag by acid dissolution method
摘要
Abstract
A novel process for preparing boiling chlorinated charges from modified electric furnace titanium slag by a three-stage combined process of sulfuric acid leaching,ammonium hydrogen fluoride leaching,and hydrochloric acid leaching was proposed.The process of boiling chlorinated charge was studied in terms of both thermodynamic and leaching behavior.The results show that the anosovite can be decomposed to form TiOSO4,which enters the filtrate after water washing.The leaching efficiencies of Al,Ca,Mg,Si,and Fe are 84.90%,26.90%,82.70%,12.03%and 89.13%,respectively,in process of sulfuric acid leaching at 250℃for 2 h when the concentrated sulfuric acid to titanium slag liquid-solid ratio is 1.7.In this stage,the grade and recovery of TiO2 are 72.58%and 42.41%.The calcium and magnesium silicates can be decomposed to form CaMg2Al2F12 precipitates by ammonium hydrogen fluoride leaching.The leaching efficiencies of Al,Ca,Mg,Si,and Fe are 29.21%,2.25%,2.32%,98.01%,and 26.74%,respectively,in the ammonium hydrogen fluoride leaching at 25℃for 2 h when the concentration of ammonium hydrogen fluoride is 15%,and the liquid-solid ratio is 10꞉1.In this stage,the grade and recovery of TiO2 are 82.31%and 89.60%.The calcium and magnesium fluoride salts in the leaching residue of ammonium bifluoride can be decomposed by leaching with hydrochloric acid.The leaching efficiencies of Al,Ca,Mg,Si,and Fe are 91.24%,93.15%,92.89%,1.29%,and 70.12%,respectively,in the hydrochloric acid leaching at 25℃for 4 h when the concentration of hydrochloric acid is 15%,and the liquid-solid ratio is 10꞉1.A boiling chlorinated charge with a final product grade of 94.36%TiO2 and impurities of 0.32%CaO and 0.14%MgO is obtained.关键词
改性钛渣/硫酸浸出/氟化氢铵浸出/盐酸浸出/沸腾氯化炉料Key words
modified titanium slag/sulfuric acid leaching/ammonium hydrogen fluoride leaching/hydrochloric acid leaching/boiling chlorinated charge分类
矿业与冶金引用本文复制引用
郭宇峰,景建发,王帅,陈凤,杨凌志,邱冠周,段文婷..改性电炉钛渣酸解法制备沸腾氯化炉料新工艺研究[J].中南大学学报（自然科学版）,2023,54(11):4263-4272,10.基金项目
国家自然科学基金资助项目(52104345)(Project(52104345)supported by the National Natural Science Foundation of China) （52104345）
