Stripping process for high iron diaspore bauxite

Abstract

The invention provides a method for dissolving out ferric diaspore type bauxite and relates to the method for dissolving out the bauxite in an alumina producing process. The method is characterized in that in the process, preprocessing alkali solution and lime CaO are used for preprocessing the ferric diaspore type bauxite; then solid-liquid separation is carried out, the separated solid is dissolved out under dissolving-out condition by normal Bayer process; the used preprocessing alkali solution is added with the lime to remove alumina in the solution, so as to realize the regeneration of the preprocessing alkali solution. In the method of the invention, only the lime is used as an additive, therefore the method has simple procedures and the ratio of aluminum and silicon (A / S) and the ratio of natrium and silicon (N / S) in the dissolved-out red mud are obviously reduced, which is applicable to processing the diaspore type bauxite with high content of ferric oxide (the content of the Fe2O3 is more than or equal to 8 percent).

Description

technical field [0001] The invention discloses a method for dissolving high-iron diaspore type bauxite, and relates to a method for dissolving bauxite in the production process of alumina. Background technique [0002] In the process of alumina production, Fe in the ore 2 o 3 Content ≥ 8% is called high-iron bauxite, due to the high iron content, the process of processing is difficult. At present, the Bayer method is generally used in the treatment of high-iron diaspore bauxite, but usually, the aluminum-silicon ratio A / S of the dissolved red mud is 1.3-2.0, and the sodium-silicon ratio N / S is about 0.5. If this part of the dissolved red mud is not recycled, it will cause a large loss of alkali and reduce the utilization rate of the ore; if it is recycled, it needs to be treated with a sintering method with high energy consumption, which will reduce the energy consumption of the entire production process. raised. The utilization rate of resources is low, iron in red mud ...

AI Technical Summary

Problems solved by technology

If this part of the dissolved red mud is not recycled, it will cause a large loss of alkali and reduce the utilization rate of the ore; if it is recycled, it needs to be treated with a sintering method with high energy consumption, which will reduce the energy consumption of the entire production process. raised

The utilization rate of resources is low, the iron in red mud is difficult to effectively enrich and recycle, and the red mud is not easy to comprehensively utilize, and the effluent residue is large, which poses a threat to environmental protection