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Drying process for thenardite

Anhydrous Glauber's salt and drying process technology, applied in inorganic chemistry, alkali metal sulfite/sulfate dehydration, alkali metal sulfite/sulfite, etc., can solve unfavorable large-scale production, low purity of Glauber's salt, Large harvesting site and other issues, to achieve the effect of reducing production and operating costs, improving dryness and production capacity, and less consumption

Inactive Publication Date: 2010-09-29
四川川眉特种芒硝有限公司
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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
[0006] 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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  • Drying process for thenardite
  • Drying process for thenardite
  • Drying process for thenardite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Under the monitoring of the DCS automatic monitoring system, the 24°Be concentrated raw nitric water transported down the well passes through the first-stage pipeline filter to remove mechanical impurities, and the third-stage ion exchanger is refined and purified to obtain refined nitric water with extremely low impurity content, and then input continuously Chemical crystallization process system to obtain high-concentration Glauber's salt crystal mixed liquid and input it into the first-stage centrifuge for dehydration, and obtain Glauber's salt crystals with free water content below 2.0%, and then input it into a three-stage spiral vacuum dryer for drying, and the drying temperature is controlled at 150°C. Enter the automatic packaging system for packaging, inspection, warehousing and sales. The various detection data obtained from Anhydrous Glauber's Salt will be shown in Table 1.

Embodiment 2

[0028] Under the monitoring of the DCS automatic monitoring system, the 24-30°Be concentrated raw nitric water transported down the well is passed through the first-stage pipeline filter to remove mechanical impurities, and the third-stage ion exchanger is refined and purified to obtain refined nitric water with extremely low impurity content. Continuous crystallization process system, the mixed liquid obtained with high-concentration Glauber's salt crystals is input into the first-stage centrifuge for dehydration, forming Glauber's salt crystals containing 2.5% free water, and then input into the three-stage spiral vacuum dryer for drying, and the drying temperature is controlled at 180°C and input into automation The packaging system carries out packaging, inspection, warehousing and sales. The various detection data obtained for Anhydrous Glauber's Salt will be shown in Table 1.

Embodiment 3

[0030]Under the monitoring of the DCS automatic monitoring system, the 24-30Be concentrated raw nitric water transported down the well is passed through the first-stage pipeline filter to remove mechanical impurities, and the third-stage ion exchanger is refined and purified to obtain refined nitric water with extremely low impurity content, and the input is continuous. The crystallization process system, the mixed liquid obtained with high concentration of thenardite crystals is input into the first-stage centrifuge for dehydration, and the thenardite crystals containing 3% free water are formed, and then input into the three-stage spiral vacuum dryer for drying, the drying temperature is controlled at 200°C, and then input into automatic packaging The system carries out packaging, inspection, warehousing and sales. The various detection data obtained from Anhydrous Glauber's Salt will be shown in Table 1.

[0031]

[0032]

[0033] Table 1

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Abstract

The invention relates to a drying process for thenardite. The process comprises the following steps of: removing mechanical impurities from original mirabilite liquid with a certain concentration conveyed underground flow by using a pipeline filter and refining and purifying the original mirabilite liquid by using an ion exchanger under the monitoring of a DCS automatic monitoring system and the control of an AK liquid balancing flow meter to obtain refined mirabilite liquid with extremely low impurity content; inputting the refined mirabilite liquid into a continuous crystallizing process system; continuously performing solid-liquid separation by using a first-stage centrifugal machine to obtain mirabilite crystal; and inputting the mirabilite crystal into a multi-stage spiral vacuum drying machine for drying and removing water moisture so as to obtain the thenardite which contains 0.01 to 0.03 percent of free water.

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] The traditional nitrate production process is to evaporate and concentrate the nitrate water to form a supersaturated solution of thenardite, then use centrifugation to separate the thenardite crystals, and then dry the thenardite crystals by airflow drying or fluidized bed drying to obtain the thenardite. Glauber's salt will form agglomerates after being stored for a certain period of time, which will cause a lot of inconvenience in use. [0003] In Chinese Patent No. CN00112995.3, the method of producing anhydrous Glauber's salt by cooling, hot-melting method and its hot-melting tower is introduced. The removal of crystallization water in the crystal, although the technological process of this method is short, but the power consumption is large, the most important thing is to use a refrigerator to circulate an...

Claims

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Application Information

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IPC IPC(8): C01D5/00C01D5/18
Inventor 苟兴无李洪清张大明李春先刘文良刘泽民李栋良
Owner 四川川眉特种芒硝有限公司
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