Method for recovering sodium sulfate from white carbon black mother solution

A recovery method and technology for silica, applied in chemical instruments and methods, alkali metal sulfites/sulfites, alkali metal compounds, etc., can solve the problems of high energy consumption and difficult to achieve mechanical freezing methods, and achieve savings The effect of production water and energy saving

Active Publication Date: 2013-09-25
FUJIAN YUANXIANG CHEM
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AI Technical Summary

Problems solved by technology

Due to high energy consumption, mechanical freezing and electrodialysis concentration methods are difficult to achieve

Method used

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Embodiment Construction

[0029] In order to describe in detail the technical content, structural features, achieved objectives and effects of the present invention, the following will be described in detail in conjunction with the embodiments.

[0030] Process flow of the present invention is as follows:

[0031] 4-8% sodium sulfate solution→water film dedusting tower→sedimentation tank→20-23 Baume degree sodium sulfate solution→evaporation crystallizer→anhydrous sodium sulfate.

[0032] When specifically carrying out sodium sulfate recovery, comprise the following steps:

[0033] 1) Preliminary filtration: the white carbon black mother liquor containing white carbon black slurry is filtered to obtain 4-8% sodium sulfate solution;

[0034] 2) Evaporation and concentration: Evaporate and concentrate the 4-8% sodium sulfate solution obtained by filtration until the concentration of the sodium sulfate solution reaches 20-23 degrees Baume;

[0035] 3) Evaporation and crystallization: Evaporate and cryst...

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Abstract

The invention discloses a method for recovering sodium sulfate from a white carbon black mother solution, and the white carbon black mother solution is generated during production of white carbon black produced by a precipitation method. The method comprises the steps of: (1) preliminary filtration, (2) evaporation and concentration, (3) precision filtration, (4) evaporation and crystallization, and (5) centrifugation, wherein the evaporation and the concentration of the step (2) are carried out in a hot-blast-stove tail-gas water-film de-dusting tower, and the evaporation and the concentration are carried out utilizing waste heat of hot-blast-stove tail gas generated during production of white carbon black produced by a precipitation method. A sodium sulfate solution which is used for hot-blast-stove tail-gas water-film de-dusting replaces process water, so that process water is saved; evaporation and concentration of the sodium sulfate solution are carried out utilizing waste heat of hot-blast-stove tail gas, so that recovering sodium sulfate from the sodium sulfate solution which is a byproduct of white carbon black becomes an economical method; the sodium sulfate solution which is a byproduct generated during the production of white carbon black is employed as tail-gas water-film de-dusting water of white carbon black drying hot-blast stove, evaporation and concentration of the sodium sulfate solution are carried out utilizing waste heat of hot-blast-stove tail gas, and then anhydrous sodium sulfate is produced; and energy consumption is reduced, so that double advantages are achieved.

Description

technical field [0001] The invention relates to a white carbon black preparation process and related processes, in particular to a method for recovering sodium sulfate in white carbon black mother liquor. Background technique [0002] Sodium sulfate, also known as sodium sulfate, is a basic chemical raw material. Widely used in the manufacture of sodium sulfide, pulp, glass, water glass, enamel, and also used as a laxative and antidote for barium salt poisoning. Industry application: [0003] 1. In the chemical industry, it is used to manufacture sodium sulfide sodium silicate water glass and other chemical products. [0004] 2. Filling material of synthetic detergent in washing industry. [0005] 3. Cooking agent used in the paper industry for the manufacture of kraft pulp. [0006] 4. In the glass industry, it is used as a cosolvent instead of soda ash. [0007] 5. Used in the textile industry to prepare vinylon spinning coagulant. [0008] 6. Used in non-ferrous met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00
CPCY02P20/129
Inventor 王升锦王承辉宫庆权
Owner FUJIAN YUANXIANG CHEM
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