Depth Treatment Of Carbonation Liquor In The New Process Of Alumina Production

Bauxite resources in China are abundant, but the quality is not high. Since resources are of high silicon and low A/S, cause the alumina industry's high operating costs and less competitive in the international arena, which is not conducive to the survival and development of alumina industry. Points in the alkali-soluble carbon in the alumina production process is membrane electrolysis of sodium carbonate to sodium bicarbonate and sodium hydroxide. There are many technical issues to be studied and solved:how to cost-effectively remove impurities in the mother liquor prolonging the life of cationic membrane; select the appropriate electrode material making the cell voltage low and stable, and so on. This paper, based on the above issues, states the main work as follows:1. The establishment of determination of trace silicon in the presence of a large number of impurity ions, and accurate determination of silicon in the mother liquor;2. Successfully carried out a second liberate silicon in the carbonation, greatly increased the A/S index, thereby improving the quality of production of alumina;3. Established measurement of trace levels of aluminum by electrochemical methods in the high salt concentration, provides a great potential for the follow-up impurity;4. Set up our own electrochemical device, effectively removing the impurities in the carbon sub-liquor, instead of ion exchange resins, found way to achieve economic environment, significantly reducing production costs into remove impurity.