TECHNOLOGY IMPROVEMENT OF SANDY ALUMINA PRODUCTION FROM DIASPORIC BAUXITE IN CHINA
Wangxing, L., Jibo, L., Zhonglin, Y., Wei, L., Zhanming, Z. and Yubo, H.
China has the second largest annual output of alumina in the world, and CHALCO is the largest alumina producer in China, whose major products were middle state alumina and powder alumina in previous years. As the technology of large pre-bake anode electrolytic cells blossomed, the requirement was for the quality level of smelter grade alumina to also improve. With the support of Ministry of Science and Technology of China, CHALCO has put up a series of fundamental studies, pilot experiments and industrialization technology for the technology breakthrough for producing sandy alumina since the year 2000. A technology system which has the characteristics of sandy alumina production from diasporic bauxite in China was developed. The technology and methods of CHALCO for producing sandy alumina were also realized by Bayer Process and Sintering-Carbonation Precipitation Process. It fully realized the upgrade of smelter grade alumina, and satisfied the demands of large pre-bake anode electrolytic cells. The technology improvement of sandy alumina production from diasporic bauxite in China will be discussed in this article.