Method for reducing steam consumption in evaporation process

A technology of consumption and steam, which is applied in the field of reducing steam consumption and steam consumption in the evaporation process, and can solve the problems of unreasonable and effective use of heat energy, etc., to reduce primary investment and operating costs, reduce water intake, and reduce steaming water burden effect

Inactive Publication Date: 2013-05-15
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] As we all know, the process of dissolving caustic soda in water is an exothermic process, which will release a lot of heat. The current production process does not make reasonable and effective use of this part of heat energy

Method used

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  • Method for reducing steam consumption in evaporation process

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited by the embodiments.

[0017] As shown in the figure, the method for reducing steam consumption in the evaporation process of the present invention supplements the caustic consumed by the system in the form of solid caustic 1, and the addition position is before the evaporation stock solution 2 enters the evaporator group 4, and the solid caustic 1 and the evaporation stock solution 2 Mix evenly in the stirring tank 3, the solid caustic 1 dissolves and releases heat, the evaporated stock solution 2 absorbs the heat and heats up, then enters the evaporator group 3, after multi-effect countercurrent evaporation, enters the lye preparation tank 4, and part of the unevaporated Evaporation stock solution 2 is allocated into qualified lye 6.

[0018] The solid caustic 1 is directly added to the stirring tank 3 wit...

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Abstract

The invention relates to a method for reducing steam consumption in an evaporation process and belongs to the technical field of aluminum oxide production. The method comprises the following steps of: supplementing caustic alkali consumed by a system in a form of solid caustic alkali before an evaporation stock solution enters an evaporator set, uniformly mixing the solid caustic alkali with the evaporation stock solution in a stirring tank, dissolving the solid caustic alkali to release heat; absorbing the heat by the evaporation stock solution to heat up and then entering the evaporator set, and then entering an alkaline liquor blending tank after multiple-effect countercurrent evaporation, blending with partial unevaporated evaporation stock solution into a qualified alkaline liquor. The method has the following advantages and effects that useless water which enters a production system together with useful ingredient sodium hydroxide in a liquid caustic alkali can be reduced by the method, the water inflow of the system can be reduced, and the distilled water burden in the evaporation process can be reduced. By adopting the method, the alkalization process of the solid caustic alkali can be canceled, so that the primary investment and operating cost for constructing factories are reduced.

Description

technical field [0001] The invention relates to a method for reducing steam consumption in an alumina production process, in particular to a method for reducing steam consumption in an evaporation process, and belongs to the technical field of alumina production. Background technique [0002] In alumina production, the drainage of the system is usually carried out in the evaporation process. The evaporated raw liquid enters the evaporator group, and after multi-effect countercurrent evaporation, the excess water in the system is discharged, and the concentrated evaporated mother liquid obtained is mixed with a part of the unevaporated raw liquid. , adjust to the target concentration, and add liquid caustic soda to adjust to the caustic ratio of qualified lye, to supplement the alkali lost by the system. [0003] In this process, the alkali loss of the system is accomplished by adding liquid caustic soda with a mass concentration of about 42-45% in the lye preparation tank, ...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 李志国张超
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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