Production method of anhydrous sodium sulfate and production equipment thereof

Abstract

The invention provides a production method of purely-natural anhydrous sodium sulfate with a pH value being 6 to 8 and production equipment thereof. The production method of the anhydrous sodium sulfate disclosed by the invention comprises the following steps of: (1) purifying a sodium-sulfate aqueous solution; (2) preparing sodium sulfate decahydrate through the saturated crystallization of the sodium-sulfate aqueous solution at the temperature of 32.4 DEG C; (3) melting the sodium sulfate decahydrate in a melting tank; and (4) washing anhydrous sodium-sulfate crystals, concentrating the anhydrous sodium-sulfate crystals in a concentrator, and then dewatering and drying through a centrifugal machine to obtain the anhydrous sodium sulfate. Because two-time crystallization is adopted and no other chemical reagent is added in the production method of the anhydrous sodium sulfate and the production equipment of the production method, the produced industrial anhydrous sodium sulfate is natural, the content of Na2SO4 in a product is larger than 99.80wt%, the pH value is 6 to 8, and the product with the granularity D50 being 70-1200mu m can be produced.

Description

technical field [0001] The present invention relates to a kind of production method of sodium sulfate and its production equipment, especially a kind of production method of anhydrous sodium sulfate and its production equipment. Background technique [0002] The existing method for producing anhydrous sodium sulfate has obtained anhydrous sodium sulfate products, all of which are made by adding some chemical components, so the anhydrous sodium sulfate obtained is not natural anhydrous sodium sulfate, and wherein Na 2 SO 4 The content of sodium sulfate is generally 99.3wt%, and the moisture content is generally 0.1wt%. It also contains a certain amount of calcium, magnesium, iron and chloride. It is difficult to ensure that the pH value of anhydrous sodium sulfate is neutral. Yet the pH value of the anhydrous sodium sulfate produced by advanced countries in the world is 6-8 at present, so the production method of existing anhydrous sodium sulfate particles is difficult to re...

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Problems solved by technology

[0002] The existing method for producing anhydrous sodium sulfate has obtained anhydrous sodium sulfate products, all of which are made by adding some chemical components, so the anhydrous sodium sulfate obtained is not natural anhydrous sodium sulfate, and wherein Na 2 SO 4 The content of sodium sulfate is generally 99.3wt%, and the moisture content is generally 0.1wt%. It also contains a certain amount of calcium, magnesium, iron and chloride. It is difficult to ensure that the pH value of anhydrous sodium sulfate is neutral.

However, the pH value of anhydrous sodium sulfate produced in advanced countries in the world is 6-8, so the existing production methods of anhydrous sodium sulfate particles are difficult to reach the standards of developed countries

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