Method for producing reagent grade sodium sulfate by using white carbon black mother solution

Abstract

The invention discloses a method for producing reagent grade sodium sulfate by using a white carbon black mother solution. The method comprises the following steps of: 1) removing a little amount of solid residue such as white carbon black and the like in the white carbon black mother solution by using a mixed cellulose micropore filtration membrane with thickness phi of less than or equal to 0.15 micron, and preliminarily purifying the white carbon black mother solution into a sodium sulfate solution; 2) treating the sodium sulfate solution obtained in the step 1) by using chelating resin toobtain a 5 to 6 percent pure sodium sulfate solution; 3) performing electrodialytic concentration on the 5 to 6 percent pure sodium sulfate solution obtained in the step 2) to obtain a 15 to 25 percent pure sodium sulfate solution; and 4) performing multi-effect evaporation on the 15 to 25 percent pure sodium sulfate solution obtained in the step 3) to obtain crystal, separating the crystal by using a centrifuge, drying the separated crystal at the temperature of 120 DEG C, and thus obtaining a finished product. The sodium sulfate product prepared by the method has the characteristics of low impurity content, high quality, low moisture content and the like, and is a high reagent grade sodium sulfate product.

Description

technical field [0001] The invention belongs to a method for producing sodium sulfate, in particular to a method for producing reagent-grade sodium sulfate by utilizing white carbon black mother liquor water. Background technique [0002] Anhydrous sodium sulfate is an important inorganic chemical product, mainly used in the manufacture of chemical products such as sodium sulfide, sodium silicate, caustic soda, sodium silicate; , tanning, synthetic fiber, synthetic detergent and pharmaceutical industries are also widely used, and the market demand is very large. At present, the production of industrial-grade anhydrous sodium sulfate is mainly prepared by dissolving, filtering, evaporating, and drying the nitrate mud in the natural salt lake. Because the nitrate mud in the salt lake contains a large amount of calcium, magnesium, iron, and chlorine, it is easy to pass through The industrial sodium sulfate product prepared by this method has high impurity content, high product...

AI Technical Summary

Problems solved by technology

Therefore, most white carbon black manufacturers dilute the white carbon black mother liquor with water and discharge it, which not only pollutes the environment but also wastes precious sodium sulfate resources.