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Preparation process of ultrafine particle thenardite

Anhydrous Glauber's salt, a manufacturing process technology, applied in the direction of inorganic chemistry, alkali metal sulfite/sulfite, alkali metal compounds, etc., can solve the problems of unfavorable large-scale production, low purity of Glauber's salt, large harvesting site, etc. , to achieve the effects of reducing production and operating costs, shortening the process flow, and high production efficiency

Inactive Publication Date: 2010-09-15
四川川眉特种芒硝有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 one-step crystallization. However, the purity of Glauber's salt produced in this way is not high, and it requires a large harvesting site and other unfavorable factors. , and at the same time, it is very unlikely that the annual output of hundreds of thousands of tons

Method used

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  • Preparation process of ultrafine particle thenardite
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  • Preparation process of ultrafine particle thenardite

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Under the monitoring of the DCS automatic monitoring system and the control of the AK liquid balance flowmeter, the 23°Be concentrated raw nitric water transported down the well passes through the first-stage pipeline filter to remove mechanical impurities, and the fourth-stage ion exchanger is refined and purified to obtain extremely low impurity content. The refined nitric water is input into the continuous crystallization process system. In the continuous crystallization system, there are heat exchangers, crystallizers and thickeners and other equipment. The refined nitric water exchanges heat with 1°C cold water in the heat exchanger to form A supersaturated solution containing 20% ​​sodium sulfate crystals - crystal 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 0.3mm, thereby forming a 35% crystal slurry, the upper part of which contains The saturated solution of sodi...

Embodiment 2

[0042] Under the monitoring of the DCS automatic monitoring system and the control of the AK liquid balance flowmeter, the 24Be concentrated raw nitric water transported down the well is passed through a three-stage pipeline filter to remove mechanical impurities, and an eight-stage ion exchanger is refined and purified to obtain a refined product with extremely low impurity content. The nitric water is input into the continuous crystallization process system. In the continuous crystallization system, there are heat exchangers, crystallizers and thickeners and other equipment. The refined nitric water exchanges heat with 1°C cold water in the heat exchanger to form a 20 The supersaturated solution of sodium sulfate crystals—the crystal slurry mixture; the crystal slurry is input from the bottom of the crystallizer, and the crystal grows in the crystallizer to an average particle size of 0.3mm, thereby forming a 40% crystal slurry, the upper part of which contains The saturated ...

Embodiment 3

[0044] Under the monitoring of the DCS automatic monitoring system and the control of the AK liquid balance flowmeter, the 24Be concentrated raw nitric water transported down the well is passed through a three-stage pipeline filter to remove mechanical impurities, and an eight-stage ion exchanger is refined and purified to obtain a refined product with extremely low impurity content. The nitric water is input into the continuous crystallization process system. In the continuous crystallization system, there are heat exchangers, crystallizers and thickeners and other equipment. The refined nitric water exchanges heat with cold water at 3°C ​​in the heat exchanger to form a %Supersaturated solution of sodium sulfate crystals - crystal 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 0.2mm, thus forming a 37% crystal slurry, the upper part of which contains sodium sulfate The clear liq...

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Abstract

The invention discloses a preparation process of ultrafine particle thenardite. The preparation process comprises the following steps of: under the monitoring of a DCS (Distributed Control System) and the control of an AK liquid balance flowmeter, filtering raw nitrate water which as certain concentration and is conveyed underground by a first-level pipeline filter to remove mechanical impurities, refining and purifying by a four-level ion exchanger to obtain refined nitrate water with ultralow impurity content, inputting the refined nitrate water into a continuous crystallization process system, separating solid and liquid by a first-level centrifuge, then inputting the separated solution to a multi-level spiral vacuum drier to dry and remove water, and inputting the product to a fluidized bed to process to obtain ultrafine particle thenardite.

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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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00
Inventor 苟兴无李洪清张大明李春先刘泽民刘文良李栋良
Owner 四川川眉特种芒硝有限公司
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