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Method for separating magma in producing soda process

A technology of production process and crystalline slurry, which is applied in the direction of carbonate preparation, etc., can solve the problems of low production efficiency of the alkali filter, increase the load of the alkali filter, and large washing water of the alkali filter, and achieve a small footprint, The effect of low maintenance rate and simple equipment

Inactive Publication Date: 2004-02-04
JIANGSU DEBANG CHEMICAL INDUSTRY GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: 1. The crystal grains in the crystal slurry obtained by the synthesis reaction are relatively small, and when entering the soda filter for filtration and separation, part of the fine crystal grains and part of the heavy alkali dissolved in the mother liquor cannot be separated, and flow out with the mother liquor. 2. The solid-liquid ratio of the crystal slurry before entering the soda filter is low, generally 22-23%, which causes the production efficiency of the soda filter to be low, increases the load of the soda filter, and makes the Its production capacity is reduced; 3. The washing water volume of the soda filter machine is large, generally 700-720 kg / ton of soda ash. When the washing water volume of the soda filter machine remains unchanged, the salt content of the prepared heavy alkali is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1. A method for separating crystal slurry in the production process of soda ash. After sodium bicarbonate crystallization is synthesized in a carbonization tower, the crystal slurry is taken out from the carbonization tower and introduced into a hydrocyclone for hydrocyclone separation. When the hydrocyclone After the solid-to-liquid ratio of the internal crystal slurry reaches 35%, the crystal slurry is introduced into an alkali filter for separation, and the solid obtained after separation is calcined to obtain soda ash.

Embodiment 2

[0013] Example 2. A method for separating crystal slurry in the production process of soda ash. After sodium bicarbonate crystallization is synthesized in a carbonization tower, the crystal slurry is taken out from the carbonization tower and introduced into a hydrocyclone for hydrocyclone separation. When the hydrocyclone After the solid-liquid ratio of the inner crystal slurry reaches 40%, the crystal slurry is introduced into the alkali filter for separation, and the overflow mother liquor exported from the overflow port of the liquid cyclone separator enters the soda production system for recycling, and the solid obtained after separation is recycled. Calcined to obtain soda ash.

Embodiment 3

[0014] Example 3. A method for separating crystal slurry in the production process of soda ash. After sodium bicarbonate crystallization is synthesized in a carbonization tower, the crystal slurry is taken out from the carbonization tower and introduced into a hydrocyclone for hydrocyclone separation. When the hydrocyclone After the solid-to-liquid ratio of the internal crystalline slurry reaches 38%, the crystalline slurry is introduced into an alkali filter for separation, and the solid obtained after separation is calcined to obtain soda ash.

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PUM

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Abstract

A process for separating crystal slurry in the production of sodium carbonate includes such steps as synthesizing sodium bicarbonate crystal in carbonizing tower, discharging the crystal slurry, hydraulic cyclone separating, alkali filtering to obtain solid and calcining. Its advantage is low load of alkali filter to increase its productivity by 20%.

Description

technical field [0001] The invention relates to a method for preparing alkali metal carbonate, in particular to a method for separating crystal slurry in the production process of soda ash. Background technique [0002] In the prior art, heavy soda ash is produced by the ammonia-soda method and the combined soda method. The traditional process is that the crystal slurry taken out of the carbonization tower directly enters the soda filter for separation, and then is calcined to obtain a finished product. Its disadvantages are: 1. The crystal grains in the crystal slurry obtained by the synthesis reaction are relatively small, and when entering the soda filter for filtration and separation, part of the fine crystal grains and part of the heavy alkali dissolved in the mother liquor cannot be separated, and flow out with the mother liquor. 2. The solid-liquid ratio of the crystal slurry before entering the soda filter is low, generally 22-23%, which causes t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/12
Inventor 赵祥海
Owner JIANGSU DEBANG CHEMICAL INDUSTRY GROUP CO LTD
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