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Manufacturing technique of high-purity thenardite

Anhydrous Glauber's salt, a manufacturing process technology, applied in the direction of alkali metal sulfite/sulfate dehydration, etc., can solve the problems of unfavorable large-scale production, low purity of Glauber's salt, large harvesting site, etc., to achieve environmental protection, Reduced cleaning time and high productivity

Inactive Publication Date: 2010-09-29
四川省川眉芒硝有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Manufacturing technique of high-purity thenardite
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  • Manufacturing technique of high-purity thenardite

Examples

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Effect test

Embodiment 1

[0037] Example 1: Under the monitoring of the DCS automatic monitoring system and the control of the AK liquid balance flowmeter, the raw nitric water with a Be concentration of 24 ° Be transported down the well is obtained through a first-stage pipeline filter to remove mechanical impurities, and a fourth-stage ion exchanger for refining and purification. Refined nitric water with extremely low impurity content is input into the continuous crystallization process system. There are heat exchangers, crystallizers and thickeners in the continuous crystallization system. Refined nitric water is heated with 1°C cold water in the heat exchanger. Exchange to form a supersaturated solution containing 20% ​​sodium sulfate crystals—grain slurry; the crystal slurry is input from the bottom of the crystallizer, and the crystal grows in the crystallizer to an average particle size of 0.5mm, thereby forming a 35% crystal slurry. The saturated solution containing sodium sulfate in the upper ...

Embodiment 2

[0038] Example 2: Under the monitoring of the DCS automatic monitoring system and the control of the AK liquid balance flowmeter, the 24-30 ° Be concentration raw nitric water transported downhole is removed through the three-stage pipeline filter to remove mechanical impurities, and the eight-stage ion exchanger is refined and purified The refined nitric water with extremely low impurity content is processed and input into the continuous crystallization process system. There are heat exchangers, crystallizers and thickeners in the continuous crystallization system. The refined nitric water is mixed with 3 ℃ cold water Perform heat exchange to form a supersaturated solution containing 20% ​​sodium sulfate crystals—a magma mixture; the magma is input from the bottom of the crystallizer, and the crystals grow to an average particle size of 0.4mm in the crystallizer, thereby forming 40% The crystal slurry, the saturated solution containing sodium sulfate in the upper part returns ...

Embodiment 3

[0039] Embodiment 3: Under the monitoring of the DCS automatic monitoring system and the control of the AK liquid balance flowmeter, the raw nitric water with a Be concentration of 24-30 ° sent down the well is removed through a three-stage pipeline filter to remove mechanical impurities, and an eight-stage ion exchanger is refined and purified. The refined nitric water with extremely low impurity content is processed and input into the continuous crystallization process system. There are heat exchangers, crystallizers and thickeners in the continuous crystallization system. Cold water is used for heat exchange to form a supersaturated solution containing 15% sodium sulfate crystals—the crystal slurry; the crystal slurry is input from the bottom of the crystallizer, and the crystal grows to an average particle size of 0.5mm in the crystallizer, thereby forming 37% sodium sulfate. The crystal slurry, the saturated solution containing sodium sulfate in the upper part returns to t...

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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 refined sodium nitrate solution into a continuous crystallization technique system, carrying out continuous solid-liquid separation by a primary centrifugal machine, then inputting the treated sodium nitrate solution 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,...

Claims

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Application Information

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IPC IPC(8): C01D5/18
Inventor 刘泽民李栋良刘文良苟兴无张大明李春先李洪清
Owner 四川省川眉芒硝有限责任公司
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