Manufacturing technique of high-purity thenardite

Abstract

The invention relates to a manufacturing technique of high-purity thenardite. The manufacturing technique comprises the steps: removing mechanical impurities in original sodium nitrate solution which has certain concentration and is conveyed under a well by a three-stage pipeline filter under the monitoring of a DCS automatic monitoring system and regulation of an AK liquid balance flow meter, using a twelve-stage ion exchanger for refining and purifying treatment to obtain refined sodium nitrate solution with extremely-low impurity content, adjusting a pH value thereof, inputting the refinedsodium nitrate solution into a continuous crystallization technique system, carrying out continuous solid-liquid separation by a primary centrifugal machine, then inputting the treated sodium nitratesolution into a multi-stage spiral type vacuum dryer for drying and removing water, inputting the sodium nitrate solution into a fluidized bed for treatment, obtaining the high-purity thenardite and finally inputting the obtained high-purity thenardite into an automatic packaging machine procedure for packaging.

Description

Technical field: [0001] The invention belongs to the field of fine processing of inorganic chemicals, or the field of fine chemicals. Background technique: [0002] Anhydrous sodium sulfate is also called anhydrous nitrate, anhydrous Glauber's salt, Yuanming powder; white fine-grained crystal or powder, easily soluble in water, hygroscopic, odorless and non-toxic. [0003] Sodium sulfate can form heptahydrate and decahydrate, heptahydrate (Na 2 SO 4 ·7H 2 O) is a white orthorhombic crystal. When heated to 24.4 ° C, it turns into anhydrous. Sodium sulfate is reduced to sodium sulfide when it reacts with carbon at high temperature [0004] Therefore, it is widely used in the manufacture of sodium sulfide, sodium silicate, etc., and is also used in papermaking, glass, printing and dyeing, synthetic fiber, tanning, food, chemical and other processes. In addition, it is also used as an admixture for non-ferrous metal mineral processing, enamel, rubber, chemical fertilizers,...

AI Technical Summary

Problems solved by technology

The technological process adopted in this method is actually to make saltwater into Glauber's salt containing crystal water first, then remove the free water in Glauber's salt, and finally obtain the production process of Glauber's salt containing crystal water; Glauber's salt has high energy consumption and the purity of Glauber's salt is not high, and it is not conducive to large-scale production

[0009] In China Patent No. 97116654.4, a production method of frozen crystallization to produce Glauber's salt containing crystal water is introduced. It goes through technological processes such as dehalogenation, concentration, beach drying, collection, and impurity removal. The method mainly adopts the method of cooling, concentration, and drying , and the temperature is controlled at 18°C ​​in hot days and 10°C in winter and spring. The purpose is to produce Glauber's salt containing crystal water by crystallization in this way. However, the purity of Glauber's salt produced in this way is not high, and it requires a large harvesting site. factor, and at the same time, it is very unlikely to produce hundreds of thousands of tons of

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