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Method for carrying out crude liquid refining without adding filter aid

A refining method and filter aid technology, which are applied in separation methods, chemical instruments and methods, filtration and separation, etc., can solve the problems of large consumption of lime milk, short production cycle of leaf filter, low capacity utilization rate, etc. The effect of filtering stage period and prolonging normal filtering time

Active Publication Date: 2013-05-15
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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Problems solved by technology

[0008] In order to solve the above technical problems, the present invention provides a method for refining crude liquid without adding filter aids. The purpose is to solve the problems of large consumption of lime milk, high loss of alumina, short production cycle of leaf filter, and low utilization rate of production capacity. The problem

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  • Method for carrying out crude liquid refining without adding filter aid

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Embodiment Construction

[0020] 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.

[0021] Such as figure 1 As shown, a method for refining crude liquid without adding filter aids, the crude liquid 1 overflowing from the separation settling tank is sent to the crude liquid tank 2 of the fine filtration process, without adding filter aids, directly through the feed pump 3 of the leaf filter It is sent to the leaf filter 4, and the refining process of the sodium aluminate solution is completed through three stages of hanging cloth, normal filtration and cake unloading, and a cycle work process is completed.

[0022] No filter aid refers to the addition of milk of lime or other filter aids.

[0023] In the stage of leaf filter 4 hanging cloth in the refining process, the feed comes from the crude liquid tank 2, and the time is 2 to 11 times the current operation cycle, ...

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Abstract

The invention relates to a method for carrying out crude liquid refining without adding a filter aid. The method comprises the following steps of: separating an overflow crude liquid of a setting tank, feeding the crude liquid into a crude liquid tank of a refined filtration working procedure without adding the filter aid, and directly feeding the liquid to a leaf filter through a feed pump of the leaf filter, so as to finish a refining process of an sodium aluminate solution after a hanging stage, a normal filtration stage and a cake unloading stage, thus finishing a cyclical operation process. The method provided by the invention has the advantages and effects that loss amount of aluminum oxide is reduced by 0.08-0.27kg / m<3> of a refining fluid; the method can prolong the period of the normal filtration stage by two times; and the filter aid is not added so as to reduce solid quantity in the crude liquid entering the leaf filter, the resistance increasing speed of a filter cake is slow in the same filter period, and the power consumption of the feed pump of the leaf filter is greatly reduced.

Description

technical field [0001] The invention relates to a method for refining crude liquid, in particular to a method for refining crude liquid without adding a filter aid in the alumina production process, and belongs to the technical field of alumina production. Background technique [0002] In alumina production, bauxite or other aluminum-containing raw materials undergo a series of processes such as crushing, grinding, pre-desilication, dissolution, sedimentation, decomposition, filtration, and roasting to produce alumina products. In this process, the dissolved ore pulp enters the separation and settling tank after being diluted, and the red mud enters the washing system in the form of the bottom flow of the separation and settling tank, and then is discharged from the production system; the sodium aluminate solution, that is, the crude liquid, enters in the form of the overflow of the settling tank In the refining process of sodium aluminate solution, the floating matter in t...

Claims

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Application Information

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IPC IPC(8): B01D37/00C01F7/20
Inventor 李志国石建军
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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