Red mud comprehensive utilization treatment method

Abstract

The invention belongs to the technical field of aluminum industry waste residue treatment, and specifically discloses a comprehensive utilization treatment method of red mud produced in production ofalumina. According to the red mud comprehensive utilization treatment method, red mud acidification treatment is performed, specifically, a hydrochloric acid solution is employed, appropriate pH value, temperature and reaction time are specifically controlled, the pH value is controlled to be 4 to 7, a reaction is carried out at 0 to 100 DEG C for 0.5 to 50 hours; after the reaction, solid-liquidseparation is easily performed on the slurry, the separated solid phase is a weak acidic alkali-removed red mud residue, and the obtained liquid phase can be used as a mother liquor for preparing caustic alkali; and the weak acidic alkali-removed red mud residue is classified to obtain a fine-grained product and a coarse-grained product, wherein fine-grained product is used as a filler, and the coarse-grained product is used as a building material or an iron-selecting material. The red mud comprehensive utilization treatment method provided by the invention effectively solves the problems of land occupation and pollution of ground surfaces and groundwater caused by red mud accumulation.

Description

technical field [0001] The invention belongs to the technical field of aluminum industry waste residue treatment, and in particular relates to a method for comprehensive utilization and treatment of red mud produced in alumina production. Background technique [0002] Red mud is the waste residue discharged when the aluminum industry extracts alumina. Generally, for every ton of alumina produced, 1.0 to 2.0 tons of red mud are incidentally produced. Red mud contains a large amount of alumina, silica, iron oxide, sodium oxide, and titanium oxide, and the pH value of red mud is very high. The pH value of the leachate contained in it is 12.1-13.0, and the pH value of red mud is 10.29. ~11.83. According to GB5058.5-2007 non-ferrous metal industrial solid waste pollution control standard, red mud belongs to general solid waste because the pH value of red mud is less than 12.5. The discharge is classified as waste water exceeding the standard. Therefore, red mud (containing leac...

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Problems solved by technology

However, the disadvantages are: red mud is leached with high acidity, the molar ratio of hydrochloric acid is 4-9:1, the acidity of the residue is relatively high, and the amount of acid used is also large, which affects subsequent use, and the loss of equipment is large; high temperature leaching consumes a lot of energy. The equipment loss is large; the dissolved components are complex, including Al, Ca, Na, Fe, Si, Re, etc., which are not convenient for comprehensive recycling; most of the rare and precious metals in the residue have been dissolved, and there is no enrichment effect. Comprehensive utilization of precious metals increases difficulties

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