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Pre-desilication process and equipment for aluminum oxide production by ore dressing Bayer process

A pre-desilication and alumina technology, which is applied to the purification of alumina/aluminum hydroxide, aluminate/aluminum oxide/aluminum hydroxide, etc., can solve the problems of high energy consumption, large number of equipment, large number of posts and operators, etc. Problems, to achieve the effect of energy-saving construction investment, simplify the process, reduce production posts and operators

Inactive Publication Date: 2009-02-25
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Claims
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Problems solved by technology

The pre-desiliconization section is composed of heating tank and retention tank. This production method has many equipments, high energy consumption, and a large number of posts and operators.

Method used

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  • Pre-desilication process and equipment for aluminum oxide production by ore dressing Bayer process

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Embodiment Construction

[0021] Such as figure 1 As shown, the present invention combines the pre-desiliconization system and the slurry preparation system into one, and arranges them in the same production section. The aluminum concentrate 1, the lye 2 and the lime 8 all quantitatively enter the slurry mixing tank 3 for mixing and stirring. The steam 6 enters the tubes in the pulp blending tank and indirectly exchanges heat with the pulp in the tank, and the steam condensed water 7 is discharged out of the pulp blending tank; qualified pulp is prepared in the pulp blending tank 3 and the temperature of the pulp reaches 90°- 100°; the pulp is transported by the pump into the dwelling desiliconization system 5, and the dwelling desiliconization system 5 only needs to ensure that the pulp has sufficient residence time, and the dwelling tank of the dwelling desiliconization system is no longer provided with a heating desiliconization tank. Lime 8 can be added in the form of dry lime or milk of lime.

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Abstract

The invention discloses a process for pre-desiliconization in alumina production and a device thereof, in particular relates to a process for pre-desiliconization in the process of producing alumina by ore dressing Bayer process and a device thereof. The structure of the device is as follows: delivery lines of aluminum concentrate (1), alkaline liquor (2) and lime (8) are connected with a pulp adjustment tank (3), a delivery line of steam (6) is connected with a tube in the pulp adjustment tank (3), and an outlet tube of the pulp adjustment tank (3) is connected with a staying desiliconization system (5). The invention combines the concentrate pulp adjusting system of the former production with the pre-desiliconization system, abandons the heating system of the former pre-desiliconization section and carries out heating in the concentrate pulp adjusting system. The process simplifies the process, saves energy and capital investment, and decreases the production posts and operators, thus increasing the labor productivity.

Description

technical field [0001] The invention relates to a pre-desilication process and equipment in alumina production, in particular to a pre-desilication process and equipment in the Bayer process alumina production for ore dressing. Background technique [0002] In the production process of Bayer process alumina in beneficiation, the aluminum concentrate after flotation is firstly blended into a concentrate slurry with qualified solid content, alkali concentration and lime ratio through the slurry blending section, and then enters the pre-desiliconization section for desiliconization. The post-silicon concentrate slurry enters the double-flow dissolution system. The pre-desiliconization section consists of a heating tank and a residence tank. This production method has many equipments, high energy consumption, and a large number of posts and operators. Contents of the invention [0003] The object of the present invention is to provide a process and equipment for pre-desilicat...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/46
Inventor 王亮马书杰王剑
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE