Method for extracting aluminum oxide from coal ash through hot-wall reaction

Abstract

In order to improve the thermal efficiency in the process of extracting alumina from fly ash, facilitate the treatment of dusty gas, reduce tail gas emissions, and realize large-scale industrial production of alumina extraction from fly ash, the invention provides a high-temperature hot wall reaction for fly ash The method for extracting alumina can solve the above problems. The specific process of the method is as follows: the reaction material enters the reaction cylinder from the feed end of the equipment, the material is conveyed forward with the rotary motion of the reaction cylinder, the reaction product is discharged from the discharge end, and the gas generated by the reaction is discharged through the tail gas outlet; the reaction The rotation speed of the cylinder is 0.1-10rpm, which is used to adjust the transmission speed of the reaction materials; during the transmission process, the materials are heated by the heating furnace set outside the reaction cylinder, and the temperature of the furnace is 140-1000°C. The above-mentioned equipment mainly includes a reaction cylinder, a heating furnace, a support system, a transmission system and a heating system.

Description

technical field [0001] The invention relates to a reaction process and equipment for extracting alumina from fly ash, in particular to a method for extracting alumina from fly ash by means of hot wall reaction. Background technique [0002] Coal occupies an important position in my country's energy structure and is one of the main energy sources in my country at present. Fly ash is a solid waste discharged from coal-fired power plants. Its discharge is very large. It occupies arable land and pollutes the environment. It is a solid waste that needs to be treated. In some high-aluminum coal production areas in my country, the alumina content in the fly ash discharged from coal-fired power plants is as high as 40-60%, which is a very important alumina and aluminum resource. For this reason, the extraction of alumina from fly ash is of great significance for the recycling of fly ash, the realization of the integrated industrial cycle of coal, electricity, ash and aluminum, the ...

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Problems solved by technology

The high-temperature reaction process of fly ash requires a lot of heat. The method of directly heating the material with hot gas has a low heat utilization rate, a large amount of tail gas, a high gas velocity in the reaction equipment, and a lot of dust entrained in the tail gas. It is difficult to deal with the dusty tail gas. Therefore, This restricts the industrial scale application of this method in the process technology of extracting alumina from fly ash

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