Roasting process of mixture of high ferric bauxite and ammonium bisulfate

作者：Xin Hai xia^*; Wu Yan; Liu Shao ming; Zhai Yu chun

来源：Transactions of Nonferrous Metals Society of China, 2014, 24(3): 808-813.

• high-iron bauxite
• ammonium bisulfate
• roasting technology

A novel process of roasting high-iron bauxite using ammonium bisulfate was proposed to overcome the defects of traditional process, such as high power consumption and low extraction rates. First, the thermodynamics in decomposition process of high-iron gibbsitic bauxite resource in Guangxi was analyzed. Then, various parameters including ammonium bisulfate addition, roasting temperature and roasting time were investigated. The product was also characterized by XRD. The results show that extraction rates of over 93% and 95% respectively for aluminum and iron are obtained after roasting at 450 degrees C for 60 min and mass ratio of ammonium bisulfate to bauxite being 3.5:1. The phase of alumina-containing compounds is always NH4Al(SO4)(2) in product. (NH4)(3)Fe(SO4)(3) is produced as intermediate products, and it is replaced by NH4Fe(SO4)(2) finally. The process is proved to be significant with the advantages of high extracting rates and low temperature.

• 出版日期2014-3
• 单位东北大学