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Method and system for eliminating organic matters in aluminium oxide production process

A production process and organic matter technology, applied in the field of organic matter removal methods and systems, can solve problems affecting the precipitation of organic matter, difficulty in filtration, loss of activity, etc., and achieve the effects of reduced production costs, good dissolution effects, and improved efficiency

Active Publication Date: 2018-12-21
广西田东锦鑫化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual production process of this method, there is a problem that the seed crystal is polluted and loses its activity. The crystal in the seed crystal tank is gradually polluted by the organic carbon compound in the solution and loses its activity, which affects the precipitation of organic matter; while filtering is very difficult, which ultimately affects The treatment effect of organic matter

Method used

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  • Method and system for eliminating organic matters in aluminium oxide production process
  • Method and system for eliminating organic matters in aluminium oxide production process
  • Method and system for eliminating organic matters in aluminium oxide production process

Examples

Experimental program
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Embodiment 1

[0035] See also figure 1 and figure 2 , Embodiment 1 of the present invention provides a system for removing organic matter in the alumina production process, including a feeding pump 1, a heat exchanger 2, a mixing tank 3, a decomposition tank 4, a ball mill 5, a slurry tank 6, and a slurry pump 7 , Flat plate filter 8, water supply device 9, filter cake tank 10, causticizing tank 11 and settling tank 12.

[0036] The feeding pump 1 is connected to the inlet of the heat exchanger 2, so that the semen before the decomposition of aluminum hydroxide added with a crystallization aid is passed into the heat exchanger 2 to exchange heat with the decomposed mother liquor, and the outlet of the heat exchanger 2 is connected to the mixing tank 3 . In this embodiment, the heat exchanger 2 is a plate heat exchanger. It can be understood that in other embodiments, the heat exchanger 2 can also use other types of heat exchangers. A stirrer 13 is installed on the mixing tank 3 to stir ...

Embodiment 2

[0047] The elimination system and method of organic matter in the alumina production process of Example 2 are roughly the same as those of Example 1, except that in this embodiment, the amount of crystallization aid added is 10 parts per million of the volume flow rate of semen Five (15 volume PPM); the stirring speed in the mixing tank 3 is 87r / min, and the stirring time is 3min; the temperature of the hot water passing into the ball mill 5 and the flat disc filter 8 is 100°C; the decomposition is controlled by the heat exchange process The temperature of the first tank 41 was 62°C.

Embodiment 3

[0049] The elimination system and method of organic matter in the alumina production process of Example 3 are roughly the same as those of Example 1, except that in this embodiment, the amount of crystallization aid added is 2 parts per million of the volume flow rate of semen Ten (20 volume PPM); The stirring speed in the mixing tank 3 is 90r / min, and the stirring time is 2min; The temperature of the first tank 41 was 63°C.

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Abstract

The invention provides a method for eliminating organic matters in an aluminium oxide production process. The method comprises the following steps that a crystallization auxiliary is added into undecomposed aluminium hydroxide refined liquor; the undecomposed aluminium hydroxide refined liquor containing the crystallization auxiliary and decomposed mother liquor are subjected to heat exchange; theundecomposed aluminium hydroxide refined liquor subjected to heat exchange and aluminum hydroxide crystal seeds subjected to decomposed seed filtering are mixed and stirred in a mixing tank to obtainmixed liquid, wherein the stirring speed is 70-90 r / min; the stirred mixed liquid enters a decomposition tank for decomposition; washing and causticizing treatment is conducted on scabs attached to the decomposition tank. According to the method, an organic matter crystal precipitation process is adjusted to be conducted in a seed decomposition working section, a better reaction environment is provided for organic matter precipitation, then the mixing tank is added between a heat exchanger and the decomposition tank, through the crystallization auxiliary and action of stirring, crystal seed particles which are evener and uniform in size are generated, increase of the particle size of aluminium hydroxide particles is promoted, organic matter form and critical concentration change is caused, large organic matter druses are induced, and the purpose of improving the organic matter precipitation amount is achieved.

Description

technical field [0001] The invention relates to the technical field of alumina production, in particular to a method and system for removing organic matter in the alumina production process. Background technique [0002] The accumulation and harm of organic matter is a problem that must be faced in the production of most Bayer process alumina plants, and the removal of organic matter is also a worldwide problem in alumina production. The impact of organic matter on alumina production is multifaceted, which is reflected in the serious impact on the output, quality and other technical and economic indicators of the product. [0003] The Chinese invention patent application with the publication number CN105668598A discloses a method for removing sodium oxalate in the production process of alumina, which is to add a crystallization aid to the decomposed mother liquor (that is, the mother liquor obtained after the decomposition of the seed crystal), and add crystallization aids. ...

Claims

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Application Information

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IPC IPC(8): C01F7/44C01F7/46
CPCC01F7/442C01F7/46
Inventor 赵志强
Owner 广西田东锦鑫化工有限公司
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