ALUMINUM OXIDE TREATMENT METHOD (VARIANTS), BAYER METHOD USING THE ALUMINUM OXIDE TREATMENT METHOD AND RAW MATERIAL TO RECEIVE ALUMINUM OXIDE TREATED THIS METHOD

摘要

Describes how to process the processed raw materials of aluminum oxide before transferring the processed raw materials in the process of extracting purified aluminum oxide from the treated raw materials. The processing method includes: (a) heating the processed raw material of aluminum oxide to a temperature of 400 to 650 ° C with direct contact with the gas, a combustion product, and (b) cooling the heated raw material to a temperature at which it can be worked and introduced into the process of producing oxide aluminum. The processing method also includes controlling the contact time of the processed alumina raw material at temperatures maintained in step (a) to ensure decomposition of the alumina trihydrate and alumina monohydrate. The method also includes limiting the maximum temperature of the incoming gases to that stage of the process at which the processed raw material of aluminum oxide reaches the specified temperature in the range from 400 to 650 ° C (hereinafter referred to as the “highest temperature stage”), and / or limiting the heat input to the stage process with the highest temperature, while ensuring that the main heat load associated with the thermal dehydration of the processed aluminum oxide raw material is observed takes place at an earlier stage or stages, at which th gas is introduced - the combustion product at a temperature above that which is a gas at the inlet to the stage with the highest temperaturoy.Mezhdunarodnaya application has been published, together with the international search report.