Method of extracting aluminium oxide from fly ash and simultaneously producing white carbon black

Abstract

A process for extracting alumina from powdered coal ash while generating white carbon black includes such steps as grinding powdered coal ash, activating, adding ammonium sulfate, reacting, adding water, filtering, filling ammonia gas into the filtered liquid to obtain the deposited mixture of aluminum hydroxide and iron hydroxide, adding the solution of sodium hydroxide to dissolve the aluminum hydroxide deposit, adding carbon to obtain pure aluminum hydroxide, and calcining to obtain Al2O3.

Description

technical field

[0001] The invention relates to a process for comprehensive utilization of fly ash, in particular to a method for co-producing white carbon black while extracting alumina from fly ash. Background technique

[0002] There are many thermal power plants in my country, which produce a large amount of fly ash every year. A million power plant discharges more than 2,500 tons of fly ash to nature every day, which brings great pressure to environmental protection. At present, the method of dealing with fly ash is mainly to make bricks or cement, but because it is rich in various substances such as alumina and silica, it has a very broad comprehensive utilization prospect. At present, there are mainly two types of processes for extracting alumina and other substances from fly ash: acid method and alkali method. However, because fly ash is a mixed material with potential volcanic ash reactivity, its structure has a high degree of polymerization and high bond energy. ...

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