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为解决攀枝花钛精矿粒度过细的问题,采用攀枝花钛精矿冶炼钛渣-氧化还原焙烧改性-盐酸浸出工艺制备高品质富钛料,为氯化法钛白粉生产提供优质原料。试验主要以常规钛渣为研究对象,借鉴钛精矿氧化还原焙烧参数对钛渣进行改性处理,通过考察浸出压力、添加剂和浸出方式对钛渣主体杂质相黑钛石M_3O_5固溶体的浸除效果来研究改性钛渣适宜的浸出工艺。结果表明,常压浸出对M_3O_5溶出效果差;添加剂可溶氯化盐、乙醇和金属铁粉不能有效提高M_3O_5浸除能力;二段浸出对钛渣浸出效果影响较小;加压浸出和搅拌浸出均有利于提高钛渣酸浸除杂(M_3O_5)效果,但都不能制备出合格的富钛料。这主要是由于钛渣改性残留较多的难溶黑钛石M_3O_5固溶体,结构较为致密,反应活性差所致。由于低品位钛渣改性处理后可能含较少的M_3O_5相,采用此种改性钛渣进行盐酸加压一段搅拌浸出(浸出条件为:145℃浸出7 h,浸出液固比为2∶1,盐酸浓度为20%),能获得w_(TiO_2)>93%,w_(∑(CaO+MgO))<1.5%的高品质富钛料,满足国内沸腾氯化原料要求。
In order to solve the problem of too fine granularity of titanium concentrate in Panzhihua, high-quality titanium-rich material was prepared by the titanium slag-redox roasting modification-hydrochloric acid leaching process of Panzhihua titanium concentrate, which provided high quality raw materials for the production of titanium dioxide by chlorination method. In the experiment, the conventional titanium slag was taken as the research object. The titanium slag was modified by using the redox roasting parameters of titanium concentrate. The effect of leaching pressure, additive and leaching method on the removal efficiency of the solid solution of black titanium oxide M_3O_5 To study the modified titanium slag suitable leaching process. The results showed that atmospheric leaching had a poor effect on the dissolution of M_3O_5; additive-soluble chloride, ethanol and metallic iron could not effectively improve the leaching ability of M_3O_5; second-stage leaching had little effect on the leaching efficiency of titanium slag; Are conducive to improve the titanium slag acid leaching miscellaneous (M_3O_5) effect, but can not be prepared qualified titanium-rich material. This is mainly due to residual titanium black residue more modified black titanium stone M_3O_5 solid solution, the structure is more compact, due to poor reactivity. As low-grade titanium slag modification may contain less M_3O_5 phase, the use of such modified titanium slag for a period of hydrochloric acid pressure stirring leaching (leaching conditions: 145 ℃ leaching 7 h, leaching liquid to solid ratio of 2: 1, Hydrochloric acid concentration of 20%) can get high-quality titanium-rich material with w_ (TiO_2)> 93% and w_ (Σ (CaO + MgO)) <1.5%