High purity big granule industrial anhydrous sodium sulphate production method

Abstract

A production method of high-purity large-grain industrial anhydrous sodium sulfate, comprising the following steps: ① extracting raw nitric water from a mine, and injecting it into the mine layer with waste water; ② treating the raw nitric water; ③ V-effect evaporation and crystallization; ④ centrifuging Dehydration; ⑤hot air drying; ⑥cyclone separation; ⑦sieving; ⑧quantitative packaging. It is characterized by the V-effect evaporation and crystallization process, which adopts a new production process of external heating forced V-effect reverse circulation vacuum evaporation, which changes the positive circulation structure of the existing evaporation tank, so that the material liquid coming out of the circulation pipe on the heating chamber is tangential Entering the lower cone of the evaporation chamber, the feed liquid spirals up in the evaporation chamber. According to the centrifugal working principle, the clear liquid rises to the liquid level in the evaporation chamber along the center of the tank, and then axially discharges to the lower circulation pipe after entering the central tube. , enter the heating tube to recirculate and heat again, and the crystals with large particles settle down along the wall of the evaporation tank and enter the crystallizer to continue to grow. The process can increase the average particle size of sodium sulfate crystals, making the particle size ≥ 65 mesh, and can reduce dust emission and environmental pollution.

Description

【Technical field】 [0001] The invention relates to a production method of high-purity large-grain industrial anhydrous sodium sulfate, which belongs to the technical field of chemical industry. 【Background technique】 [0002] Industrial anhydrous sodium sulfate, commonly known as sodium sulfate, is a chemical raw material used in the washing industry, glass product industry, leather printing and dyeing industry, etc. China's industrial anhydrous sodium sulfate began large-scale production as early as the 1970s. Because the production technology and equipment used at that time were relatively backward, almost all anhydrous sodium sulfate was produced by boiling in a pan. The production capacity of a single set of equipment Only a few hundred tons per year, the production scale is small, the product quality is poor, and the production cost is high; in the early 1980s, the production process was improved, and some enterprises in Sichuan and Yuncheng, Shanxi began to adopt single...

AI Technical Summary

Problems solved by technology

And existing production technology is still difficult to realize this high-purity large particle industrial anhydrous sodium sulfate