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The silicon content of alumina rich coal fly ash produced in northern Shanxi and Shaanxi province as well as southern Inner Mongolia of China is in the range of 42-48%.This provides a possible resolution for the crisis of diminishing bauxite resource in China.A new technology has been developed of industrial application potential by using alkali desilicated coal fly ash as bauxite substitute to exact aluminum.The aluminum/silicon ratio of the fly ash had been improved from 0.86 to 1.63-2.0 by alkali desilication.