An optimum approach to processing medium and low grade bauxite effectively & economically

摘要：

Over 98％ of bauxite in China is diaspore bauxite. The explored bauxite resource is about 3 billion tons, more than 60％ of which is medium and low grade bauxite (A/S=4~6). The annual alumina capacity of Chinese established and establishing refineries processing domestic bauxite is about 32.5 million tons. 90％ of these refineries adopt Bayer process and their annual demand of medium or higher grade bauxite (A/S≥5 5) is 74 million tons. However, the explored basic reserve of bauxite (A/S≥5) is about 530 million tons which will only last for about 9 years. Supposing bauxites A/S is 5, the alumina recoveries of Bayer process and dressing-Bayer process are only 69％ and 65％~67％ respectively, and the alumina recovery of serial combination process can be more than 93％. However, the energy consumption of traditional serial combination process is much higher, which is 21～25 GJ/t-Al2O3 and 1.75~1.9 times of that of Bayer process and 1.8~2 times of that of dressing-Bayer process. If the neo-serial combination process with simplified flow and dry sintering process is taken, the energy consumption would reduce to less than 20.5 GJ/t-Al2O3, making its production cost lower than that of Bayer process and dressing-Bayer process. Therefore, the dry sintering neo-serial combination process is an optimizing approach to processing medium and low grade bauxite effectively and economically.

关键词： Medium and low grade bauxite Bay process Dressing-Bayer process Mixed combination process Serial combination process Alumina recovery Energy consumption

作者: Xinqin Liao Laishi Li

作者单位: Aluminum & Magnesium Engineering & Research Institute, 184 Heping North Street, Shenyang 110001, China

会议类型: 国际会议

会议名称: XVIII International Symposium of ICSOBA(第18届国际铝土矿、氧化铝及铝工业学术年会)

会议地点: 郑州

会议语种:英文

页码: 193-199

在线出版日期: 2010-11-25（万方平台首次上网日期，不代表论文的发表时间）