Method for washing pseudo-boehmite

A technology of pseudo-boehmite and washing method, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problem of washing water and other problems, and achieve the effects of saving water, increasing the number of washings, and improving the efficiency

Inactive Publication Date: 2019-04-16
YUNNAN WENSHAN ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a washing method for pseudo-boeh

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The washing method of pseudo-boehmite comprises the following steps:

[0023] S1 First washing: After filtering the aged pseudo-boehmite slurry, the filter residue is discharged into the primary washing tank, and mixed with the secondary filtrate sent from the secondary washing liquid storage tank to complete the first washing. The volume ratio is 15:1, and the mixing time is 40 minutes;

[0024] S2 second washing: after the first washing, filter again, the primary filtrate flows into the primary washing liquid storage tank, and the primary filter residue is discharged into the secondary washing tank, and mixed with the four filtrates sent from the fourth washing liquid storage tank to complete For the second washing, the liquid-solid volume ratio is 20:1, and the mixing time is 30 minutes;

[0025] S3 third washing: after the second washing, filter again, the secondary filtrate flows into the secondary washing liquid storage tank and then pumps it into the primary was...

Embodiment 2

[0030] The washing method of pseudo-boehmite comprises the following steps:

[0031] S1 First washing: After filtering the aged pseudo-boehmite slurry, the filter residue is discharged into the primary washing tank, and mixed with the secondary filtrate sent from the secondary washing liquid storage tank to complete the first washing. The volume ratio is 20:1, and the mixing time is 20 minutes;

[0032] S2 second washing: after the first washing, filter again, the primary filtrate flows into the primary washing liquid storage tank, and the primary filter residue is discharged into the secondary washing tank, and mixed with the four filtrates sent from the fourth washing liquid storage tank to complete For the second washing, the liquid-solid volume ratio is 20:1, and the mixing time is 40 minutes;

[0033] S3 third washing: after the second washing, filter again, the secondary filtrate flows into the secondary washing liquid storage tank and then pumps it into the primary was...

Embodiment 3

[0038] The washing method of pseudo-boehmite comprises the following steps:

[0039] S1 First washing: After filtering the aged pseudo-boehmite slurry, the filter residue is discharged into the primary washing tank, stirred and mixed with the secondary filtrate sent from the secondary washing liquid storage tank, and heated to 50°C with steam Complete the first washing, the liquid-solid volume ratio is 20:1, and the mixing time is 20 minutes;

[0040] S2 Second washing: After the first washing, filter again, the primary filtrate flows into the primary washing liquid storage tank, and the primary filter residue is discharged into the secondary washing tank, mixed with the fourth filtrate from the fourth washing liquid storage tank and passed through Put in steam and heat to 50°C and stir to complete the second washing, the liquid-solid volume ratio is 20:1, and the stirring and mixing time is 40 minutes;

[0041] S3 third washing: after the second washing, filter again, the se...

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PUM

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Abstract

The invention discloses a method for washing pseudo-boehmite. The method comprises the following steps of primary washing, wherein after aged pseudo-boehmite slurry is filtered, filter residues are discharged into a primary water washing tank, and the filter residues and secondary filtrate sent by a secondary washing liquid storage tank are mixed and washed; secondary washing, wherein filtering iscarried out again, the primary filtrate flows into a primary washing liquid storage tank, the primary filter residues are discharged into a secondary water washing tank, and the primary filter residues and fourth-time filtrate sent by a fourth-time washing liquid storage tank are mixed and washed; tertiary washing, wherein filtering is carried out again, the secondary filtrate flows into the secondary water washing tank and then is pumped into the primary water washing tank, the secondary filter residues are discharged into a tertiary water washing tank, and the secondary filter residues andhot water in a hot water tank are mixed and washed; fourth-time washing, wherein filtering is carried out again, the tertiary filtrate flows into the tertiary water washing tank, tertiary filter residues are discharged into a fourth-time water washing tank, and the tertiary filter residues and the hot water of the hot water tank are mixed and washed; filtering-out, wherein filtering is carried outagain, the fourth-time filtrate flows into the fourth-time washing liquid storage tank and is pumped into the secondary water washing tank, and the fourth-time filter residues are qualified filter residues. The washing frequency is increased, the washing efficiency is improved, but the water consumption is greatly reduced.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for washing pseudo-boehmite. Background technique [0002] In the alumina production process, after the pseudo-boehmite slurry is aged, the pseudo-boehmite needs to be washed and filtered. In the existing washing process, three washing methods are adopted, and new water is added to washing each time, which is a waste of water. Contents of the invention [0003] The purpose of the present invention is to provide a washing method for pseudo-boehmite, which solves the problem of washing waste water after the aging of pseudo-boehmite slurry. [0004] In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: [0005] The washing method of pseudo-boehmite comprises the following steps: [0006] S1 first washing: after filtering the aged pseudo-boehmite slurry, the filter residue is discharged into the primary...

Claims

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Application Information

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IPC IPC(8): C01F7/02
CPCC01F7/02
Inventor 何清郝红杰赵加平罗俊松陈映杨敬李加材唐绍华王治国
Owner YUNNAN WENSHAN ALUMINUM
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