Removal of iron from ilmenite by KOH leaching-oxalate leaching method

稀有金属（英文版）, 2010, 29(1): 9-15. doi: 10.1007/s12598-010-0002-x

^1, , ^2, , ^3, , ^4,

1.Graduate School of Chinese Academy of Sciences, Beijing 100039, China;Key laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China

2.Key laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China

3.Key laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China

4.Key laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China

基金项目: the National Key Technologies R&D Program in the 11th Five-Year Plan Period(2006BAC02A05) 国家自然科学基金(50574084) 国家重点基础研究发展规划(973计划)(2007CB613501)

Removal of iron from ilmenite by KOH leaching-oxalate leaching method

WANG Yuanbo ^1, , QI Tao ^2, , CHU Jinglong ^3, , ZHAO Wei ^4,

2.Key laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China

3.Key laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China

4.Key laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China

Keywords： ilmenite

Oxalic acid was used for the removal of iron from the intermediates of ilmenite leached by KOH liquor. Various parameters, such as pH, temperature, initial oxalate concentration, and illumination were investigated. Meanwhile, it was found that orthorhombic crystal Ti_2O_2(OH)_2(C_2O_4)·H_2O formed as the leaching proceeded.Scanning electronic microscope (SEM) images implied that the formation of Ti_2O_2(OH)_2(C_2O_4)·H_2Owith good crystallinity proceeded through three stages. Calcining Ti_2O_2(OH)_2(C_2O_4)·H_2O, anatase (350℃) or rutile(550℃) type TiO_2 was obtained, respectively. Element analysis found that the calcined product contained 94.9% TiO_2 and 2.5% iron oxide, but only about 1600 ppm dissolvable iron oxide was left, which indicates that oxalic acid was comparatively effective on iron oxide removal from the intermediates. Finally, an improved route was proposed for the upgrading of ilmenite into rutile.

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Removal of iron from ilmenite by KOH leaching-oxalate leaching method

参考文献