Method for recovering sodium sulfate from white carbon black mother solution

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...

AI Technical Summary

Problems solved by technology

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