Method for preparing aluminum oxide from coal series kaolinite rock or coal gangue
A technology of kaolinite and coal gangue, which is applied in the field of high-value comprehensive utilization of coal-measure kaolinite or coal gangue resources, can solve the problems of high leaching temperature, high calcination temperature, and long leaching time, and achieve energy saving and resources, mild operating conditions, and reduced energy consumption
Inactive Publication Date: 2008-08-06
EAST CHINA UNIV OF SCI & TECH
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The invention relates to a method for preparing alumina by using kaolinite in coal measures or coal gangue as raw material with simple process and low energy consumption; by utilizing special influence of inner heat source (carbon) in the kaolinite in coal measures or coal gangue on calcination performance of the kaolinite in coal measures, the alumina is prepared after crashing, low temperature calcination, hydrochloric acid leaching, filtration, purification and fractional-step pyrolysis by fractional steps. The method for preparing the alumina has the advantages that the problems that calcination temperature of the prior art is high or calcination time is long as well as leaching temperature is high or leaching time is long are solved; process energy consumption is reduced; intermediate product of the purified and separated watery alumina is not required to be dried; the alumina is prepared directly by using the method of the pyrolysis by fractional steps; the process is simplified and operability is improved.
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