Method for preparing soluble aluminum hydroxide by taking red mud as raw material

Abstract

The invention relates to the technical field of red mud recycling, in particular to a method for preparing soluble aluminum hydroxide by taking red mud as a raw material, and provides the following scheme aiming at the problems of high energy consumption and secondary pollution in refining of aluminum in the red mud in the prior art: S1, drying and grinding the taken red mud to obtain a red mud powder; sieving the ground red mud with a 300-mesh sieve to obtain red mud powder; s2, the red mud treated in the step S1 makes full contact with a certain amount of 32% sodium hydroxide solution, then a certain amount of sodium hypochlorite is added to react at a certain temperature, a sodium ferrate solution is obtained through filtering, and the iron content in the remaining red mud is reduced to 1% or below through filtering separation. And the method has low requirements on the performance of equipment, does not consume a large amount of energy, does not generate waste gas or cause pollution, can only extract aluminum in the extraction process, and is more convenient for people to use.

Description

technical field [0001] The invention relates to the technical field of red mud recovery and utilization, in particular to a method for preparing soluble aluminum hydroxide by using red mud as a raw material. Background technique [0002] Red mud is a reddish-brown powdery mud-like strongly alkaline solid waste produced during the production of alumina from bauxite. China, as a major producer of alumina, has a large stockpile and annual production of red mud. It is estimated that At present, the stock of red mud in my country is about 600 million tons, and the annual new production is still more than 70 million tons. A large amount of red mud cannot be effectively used and can only be stored, which not only occupies a large amount of land, but also poses a great environmental risk. [0003] At present, the recovery methods of alumina in red mud mainly include alkaline method and acid method. The sintering method belongs to the alkali method and is classified as pyrometallurgy...

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Problems solved by technology

[0005] The invention proposes a method for preparing soluble aluminum hydroxide by using red mud as raw material, which solves the problems of high energy consumption and secondary pollution in the prior art in the extraction of aluminum from red mud

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