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Method for preparing special mirabilite with high purity

A manufacturing method and high-purity technology, applied in magnesium hydroxide and other directions, can solve the problems of agglomeration, inconvenience in use, and low product purity.

Inactive Publication Date: 2009-12-16
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

[0003] The traditional nitric acid production process adopts equivalent chemical treatment to remove metal ion impurities such as calcium, magnesium, arsenic, lead, cadmium, antimony, etc. in the raw nitric acid water, so that the thenardite crystals are precipitated, and the thenardite crystals are separated by centrifugation, and then the thenardite crystals are processed Hot-melt vacuum evaporation removes crystal water, drying and cooling Glauber's salt, the product produced in this way has low purity, and Glauber's salt will form agglomerates after being stored for a certain period of time, which will cause inconvenience when it is used

Method used

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  • Method for preparing special mirabilite with high purity
  • Method for preparing special mirabilite with high purity
  • Method for preparing special mirabilite with high purity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]Use a pump to pump hot water at 40°C to dissolve the Glauber's salt (sodium sulfate) in the ore to form nitric water containing various impurities and a sodium sulfate concentration of 20.7%. Add 2641.4g / m 3 Sodium carbonate and 794.1g / m 3 Sodium sulfide, then add sodium hydroxide to make the pH value of nitric water reach 9; Impurities are removed, water is evaporated in a five-effect heat vacuum to form a saturated solution of Glauber’s salt and Glauber’s salt containing crystal water. After centrifugation, the Glauber’s salt and saturated solution containing crystal water are separated, and the saturated solution is returned to the five-effect heat vacuum evaporator for reuse. The thenardite containing crystal water is input into the hot-melt vacuum evaporation kettle to further remove the crystal water in the thenardite. When the moisture content in the dehydration kettle is reduced to 3%, the solid thenardite in the dehydration kettle is kept at 45°C for 0.5 hours. ...

Embodiment 2

[0038] Use a pump to pump hot water at 70°C to dissolve the Glauber's salt (sodium sulfate) in the ore to form nitric water containing various impurities and a sodium sulfate concentration of 32.1%. Add 2872.1g / m 3 Sodium carbonate and 836.1g / m 3 Sodium sulfide, then add sodium hydroxide to make the pH value of the nitric water reach 10; then add 0.15%wt polyaluminum ferric chloride sulfate (PAFCS) to settle the various precipitated substances generated, and finally add sulfuric acid to adjust the pH value of the nitric water Reach 7.1. In this way, after removing impurities and evaporating water in five-effect heat vacuum, a saturated solution of Glauber's salt and Glauber's salt containing crystal water is formed. After centrifugation, the Glauber's salt and saturated solution containing crystal water are separated, and the saturated solution is returned to five-effect heat for vacuum evaporation. The kettle is reused, and the thenardite containing crystal water is input int...

Embodiment 3

[0040] Use a pump to pump hot water at 50°C to dissolve the Glauber's salt in the ore to form nitric water containing various impurities and a sodium sulfate concentration of 25.8%. Add 2641.4g / m 3 Sodium carbonate and 889.2g / m 3 Sodium sulfide, then add sodium hydroxide to make the pH value of the nitric water reach 10; then add 0.25% wt polyaluminum ferric chloride sulfate (PAFCS) to settle the various precipitates generated, and finally add sulfuric acid to adjust the pH value of the nitric water Reach 7.4. In this way, after removing impurities and evaporating water in five-effect heat vacuum, a saturated solution of Glauber's salt and Glauber's salt containing crystal water is formed. After centrifugation, the Glauber's salt and saturated solution containing crystal water are separated, and the saturated solution is returned to five-effect heat for vacuum evaporation. The kettle is reused, and the thenardite containing crystal water is input into the hot-melt vacuum evapo...

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Abstract

The invention provides a method for preparing special mirabilite with high purity, which comprises the following steps: pumping hot water at 40 DEG C-70 DEG C by a pump and dissolving mirabilite in ore to form niter water containing various impurities; calculating the content of added sodium carbonate with the excess of 10 percent-20 percent according to the detected content of calcium and magnesium ions in the original niter water during chemical impurity removal processing; calculating the content of added sodium sulfide with the excess of 20 percent-30 percent according to the detected content of heavy metal ions including ferrum, arsenic, lead, cadmium, antimony, and the like in the original niter water; then adding sodium hydroxide to lead the pH value of the niter water to reach 9-11; adding 0.1-0.3 percent by weight of polyferric sulfate and polyaluminum-ferric chloride sulfate to enable various generated sediments to settle; and finally adding sulfuric acid to adjust the pH value of the niter water to reach 7-7.5. The wet niter containing crystal water is processed by a fluidized bed after standing at 45 DEG C-80 DEG C for 0.5 hour-3 hours in a heat preservation way, thereby obtaining anhydrous special mirabilite with high purity. The mirabilite can not be caked during long-term placement at room temperature and can be widely applied to industries of foods, medicines, and the like.

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] Sodium sulfate decahydrate is Glauber's salt, Glauber's salt (Na 2 SO 4 10H 2 O), white fine crystal or powder, easily soluble in water, hygroscopic, odorless, non-toxic. 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. Widely used in the manufacture of sodium sulfide, sodium silicate, etc., also used in papermaking, glass, printing and dyeing, synthetic fiber, leather, food, medicine, chemical and other industries. In addition, it is also used as an admixture for non-ferrous metal mineral processing, enamel, rubber, chemical fertilizers, and light materials, as well as an additive for cement an...

Claims

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Application Information

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IPC IPC(8): C01F5/16
Inventor 刘泽民苟兴无刘文良张大明余大海
Owner 四川川眉特种芒硝有限公司
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