[China Aluminum Industry Network] China's bauxite is a diaspore type, requiring a dissolution temperature higher than 240°C, which is a relatively difficult-to-dissolve ore. China's bauxite is relatively low in aluminum and silicon (6 to 9). Raw materials determine that China's alumina production has higher energy consumption than foreign countries, and costs are high. China's alumina industry started from the sintering process. Due to a series of technologies such as unsaturated formula, low caustic dissolution ratio, coal slurry desulphurization, deep desiliconization, etc., the sintering method has made new development and achieved remarkable results. However, the sintering method has a large amount of material and the process is complex, especially in high-temperature firing as the main process, and the energy consumption is particularly high. The energy consumption per ton of alumina reaches 40 GJ, and the energy cost accounts for 53% of the production cost. It is clear that the soda lime sintering method lacks the competitiveness in the international market. To this end, China's Great Wall Aluminum Company alumina plant in the world first used a "Bayer - sintering" mixed production of alumina. After more than 30 years of hard work, this method has been improving, with an overall alumina recovery rate of 92.2% and alkali consumption (calculated as Na2CO3) of 69kg/t. Compared with the Shanxi Aluminum Plant sintering method, the production cost is lower by more than 15%. As a result, the Guizhou aluminum plant changed from 1989 to mixed-smelting to produce alumina. In 1992, the aluminum plant in Shanxi was changed to a mixed-joint method to produce alumina. Shandong Aluminum Plant and Zhongzhou Aluminum Plant were also changed to mixed joints.
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