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Method for evaporating pregnant solution generated in producing alumina by water-typed alumyte

A treatment method and bauxite technology, applied in the direction of alumina/hydroxide, etc., can solve the problems of water pollution in the upper and lower circulation, and achieve the effect of reducing the loss of lye, reducing pollution, and improving the degree of vacuum

Inactive Publication Date: 2009-06-03
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
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AI Technical Summary

Problems solved by technology

In the realization of production, the VI effect secondary steam in the evaporation process often contains a large amount of alkali, up to 0.4g / l, which makes the upper and lower circulating water seriously polluted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] In the lime Bayer method to process monohydrate bauxite to produce alumina, a set of vapor-liquid separation device is added between the outlet of the VI effect evaporator and the water cooler. The separation device is a φ2600×6000 high-efficiency mist catcher. The alkali weight of the final secondary steam is less than 0.1g / l; the alkali content of the condensed water from the cooler is ≤0.06g / l, the alkali liquid return process of vapor-liquid separation, the alkalinity of the upper and lower water in the evaporation group I and II The average alkali content in the whole month is about 0.1g / l, and the effect is obvious.

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PUM

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Abstract

The invention relates to a method for evaporating pregnant solution generated in producing alumina by a water-typed alumyte, in particular to a processing method of evaporating second steam containing alkali in producing alumina by lime bayer's process with alumyte as raw material. The method of the invention is characterized in that vapour and liquid separation is carried out first on VI effect second steam formed by evaporating pregnant solution, then the second steam after vapour and liquid separation enters a water cooler, a mist catcher for the vapour and liquid separation catches the low cooling liquid back-flow process. In the invention, the method effectively reduces alkalinity of condensed water produced by the water cooler, reduces loss of alkali liquor, saves production cost, and improves vacuity, so that the production capacity of an evaporator reaches preset level. In addition, the method reduces alkalinity of cycle water, reduces pollution of cycle sewage, and ensures stable production.

Description

technical field [0001] The invention relates to a method for evaporating mother liquor of monohydrate bauxite to produce alumina, and relates to a method for treating bauxite with bauxite as raw material and adopting the lime Bayer process to produce alumina by evaporating secondary steam with alkali. Background technique [0002] In the process of producing alumina with monohydrate bauxite, due to the low aluminum-silicon ratio of monohydrate bauxite, the difference in ore endowment (stone) components, and the increase in alkali consumption, it is difficult to use the traditional pure Bayer method for production. Lime Bayer process is a mature alumina production process, especially suitable for the treatment of trihydrate bauxite with high aluminum-silicon ratio. It has the characteristics of simple process and good product quality. At present, the lime Bayer method is also an effective method for processing monohydrate bauxite to produce alumina. Compared with the pure Bay...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 李学武刘晓社
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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