摘要
介绍了使用工业硅渣浮选获得的工业硅粉,通过高温熔融法,分离残余渣相提纯工业硅,考察了不同气氛及熔剂添加量对渣-硅分离效果和工业硅杂质含量的影响.分别在空气气氛、氩气保护气氛及添加不同含量复合熔剂条件下,将 10g精矿样品于 1450℃熔融处理 5 min,随后淬冷制样磨抛统计样品单位截面积内硅滴的尺寸分布,以判断硅滴熔融聚集长大与渣相分离的特性.同时,检测不同条件下,熔融处理后获得的工业硅典型杂质含量变化.结果表明:惰性保护气氛会阻碍硅滴聚集长大与残余渣相分离,添加 1%～2%的熔剂可加速硅滴长大集聚与渣相分离.在空气气氛并添加 2%熔剂的条件下,可显著脱除熔融工业硅中的钙、铝杂质,可在一定程度上脱除部分铁、钛杂质.
Abstract
In this study,silicon powder acquired via flotation of the refining slag of metallurgical grade silicon(MGS)was chosen as the basis of the experiments.High temperature smelting was adopted to separate silicon from the remai-ning slag.The effect of atmosphere and content of fusion agent addition on the separation of silicon from remaining slag were investigated.For each smelting experiment,10 g of powder sample was heated to 1450℃and held for 5 min un-der Ar protection or in air.The smelted samples were then mounted in resin and polished to show the cross-section and investigate the feature and size distribution of silicon drops within per unit area.Thus,the gathering and combining features of silicon drops and their separation process from slag can be evaluated.Meanwhile,impurity elements within the silicon drops before and after smelting under different circumstances were also measured.Results indicate:Ar pro-tection can postpone the gathering and combining of silicon drops and deteriorate the separation of silicon from the slag.Adding 1%～2%of fusion agent can accelerate the gathering and separation of silicon from slag.Under the condition of air atmosphere and 2%fusion agent addition,Al and Ca in silicon can be removed obviously;Fe and Ti can be re-moved partially.
基金项目
贵州省基础研究计划(科学技术基金)资助项目(黔科合基础[2020]1Y221)
贵州省贵州理工学院高层次人才科研启动资助项目(XJGC20190963)
NETL
NSTL
万方数据