摘要:
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M3O5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M3O5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M3O5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(M3O5)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M3O5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M3O5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wTiO2>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。
关键词:
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钛渣 /
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盐酸浸出 /
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富钛料 /
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添加剂
Abstract:
To deal with the small particle size of Panzhihua ilmenite,the processes of smelting slag with Panzhihua titanium concentrate as raw material followed by redox calcination modification and hydrochloric acid leaching were adopted to produce high quality of titanium-rich material,which provides high quality of raw materials for production of titanium dioxide by chlorination process. The experiments were conducted to determine the appropriate leaching process with the normal Ti-slag by investigating the effects of leaching pressure,additives and leaching methods on extraction efficiency of the main impurities M3O5 in Ti-slag which was redox modified referring to the calcination parameters for titanium concentrates modification.The results show that it is difficult to extract M3O5 by atmospheric pressure leaching and the addition of soluble chloride salts,ethanol and iron powder cannot efficiently improve the leaching ability of M3O5 in Ti-slag.Furthermore,the second stage leaching has little influence on leaching efficiency of Ti-slag.It is favorable to improve the extraction efficiency of M3O5 by pressure leaching or agitation leaching but qualified titanium-rich materials cannot be prepared by the mentioned methods.It is mainly attributed to a great amount of residual insoluble M3O5 with dense structure in the modified Ti-slag,leading to a poor reactive activity.Due to the fact that a smaller content of M3O5 remains in the low-grade Ti-slag with modification treatment,the hydrochloric acid leaching process coupled with external pressure and agitation was applied to the first stage of leaching using the low-grade Ti-slag with modification treatment as raw material,with leaching at 145℃ for 7 h,2:1 of liquid-solid ratio and 20% of HCl concentration.It is evidenced that the high quality titanium-rich materials with wTiO2> 93% and w∑(CaO+MgO)< 1. 5% can be obtained satisfying the requirements for raw materials of domestic fluidizing chlorination process.
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