Leaching of ilmenite ores by acidic chloride solutions

详细信息    查看全文

• 作者：G.K. Das ; ^{Goutam.Das@csiro.au} ; Y. Pranolo ; Z. Zhu ; C.Y. Cheng
• 关键词：Ilmenite ore ; Chloride leaching ; Titanium extraction
• 刊名：Hydrometallurgy
• 出版年：2013
• 出版时间：February, 2013
• 年：2013
• 卷：133
• 期：Complete
• 页码：94-99
• 全文大小：664 K

文摘

The direct leaching of Australian ilmenite ore samples with HCl was found to be much more effective with high chloride (Cl^?) concentration (~ 500 g/L) in the feed solution. The presence of CaCl₂ was more effective for leaching than that of MgCl₂ and NaCl due to its higher solubility. The effects of pulp density, retention time, HCl concentration, CaCl₂ concentration and temperature were examined to optimise the leaching conditions. The optimum conditions for leaching ilmenite in this study were found to be 5-7.5 M HCl solution with a total Cl^? concentration of ~ 500 g/L, 3.3 % (w/w) pulp density, 70-80 ¡ãC and 4-6 h of retention time. Under these conditions, the optimum leaching efficiencies were ~ 98-99 % Ti and 96 % Fe for ilmenite ore A and 94 % Ti and 93 % Fe for ilmenite ore B. One of the advantages of the HCl-CaCl₂ direct leach process is that the HCl-CaCl₂ solution can be recycled back to leaching after Ti recovery. The leach residue containing mainly unleached rutile and pseudorutile can be used as a feed for synthetic rutile production.