Method for producing ultrafine-grain special mirabilite

A technology of ultra-fine particles and manufacturing methods, applied in chemical instruments and methods, alkali metal sulfites/sulfites, alkali metal compounds, etc., can solve the problem of uneven particles, no open patents have been found, and no ultra-fine particles have been reported. Special Glauber's salt and other problems of granules, to achieve the effect of good granule fluidity and change the production process

Inactive Publication Date: 2009-05-13
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

[0006] 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 to obtain the thenardite. The particles are very uneven, and the resulting Glauber's salt will form agglomerates after being stored for a certain period of time, which will cause a lot of inconvenience in use
[0007] Up to now, the production of special thenardite with ultrafine particles has not been reported in relevant domestic publications, and no relevant public patents have been found at the same time.

Method used

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  • Method for producing ultrafine-grain special mirabilite
  • Method for producing ultrafine-grain special mirabilite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Use a pump to pump hot water at 40-70°C to dissolve the Glauber's salt (sodium sulfate) in the ore to form a Glauber's salt (sodium sulfate) solution (abbreviation: salt water) containing various impurities and a sodium sulfate concentration of 28.4%. After refining to remove impurities, five-effect vacuum evaporation and concentration, crystallization, the nitric acid slurry is subjected to high-speed shearing at 2000rpm, and after centrifugation, wet nitric acid with a water content of 3% is obtained, and the wet nitric acid is transported to a drying device for drying, and the product is sent to LLC-I Special fluidized bed treatment, separation of coarse particles of Glauber's salt, raw salt water and various data of the purity of Glauber's salt obtained from production figure 2 manifested in.

Embodiment 2

[0030] Use a pump to pump hot water at 40-70°C to dissolve sodium sulfate in the ore to form nitric water containing various impurities and a concentration of sodium sulfate of 28.1%. After refining to remove impurities, five-effect vacuum evaporation concentrates and crystallizes. After the nitric slurry is sheared at a high speed of 2200rpm, wet nitric acid with a water content of 6% is obtained. The wet nitric acid is transported to the drying device for drying, and the product is sent to the special fluidized bed of LLC-I for treatment, and the coarse granular mirabilite, raw nitric water and Various data on the purity of Glauber's salt are obtained in the figure 2 manifested in.

Embodiment 3

[0032] Use a pump to pump hot water at 40-70°C to dissolve sodium sulfate in the ore to form nitric water containing various impurities and a sodium sulfate concentration of 25.6%. After refining to remove impurities, five-effect vacuum evaporation concentrates and crystallizes. The nitrate slurry is sheared at a high speed of 2400rpm and centrifuged to obtain wet nitrate with a water content of 6%. The wet nitrate is transported to the drying device for drying, and the product is sent to the LLC-I special fluidized bed for treatment to separate the coarse particle of Glauber's salt. Various data on the purity of raw saltwater and thenardite obtained from production are in figure 2 manifested in.

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Abstract

The invention discloses a method for preparing superfine granule special type saltcake, which includes the following technical steps: pumping hot water at 40-70 DEG C, and forming a saltcake solution containing a plurality of impurities; concentrating for crystallization by vacuum evaporation after refining impurities; cutting the saltcake solution at a high rotating speed; drying after centrifugal separation, processing by a fluidized bed, separating coarse granule saltcake and obtaining a superfine granule special type saltcake product. The anhydrous superfine granule special type saltcake product obtained by the process method of the invention after high rotating speed cutting and fluidized bed processing has the advantages of good granule fluidness and low possibility of agglomeration. The product can be widely used for preparing sodium sulfide, sodium silicate and the like, and is also used in industries of paper making, glass, printing and dyeing, synthetic fiber, hide manufacture, food, medicine 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), English name: Sodiumsulfate, Sodium sulfate, anhydrous Thenardite, containing 55.9% of crystal water and 44.1% of sodium sulfate. Pure mineral contains Na 2 O 19.3%, SO 3 24.8%. Monoclinic crystal system, usually in the form of granular and massive, and also in the form of shell or film. Colorless and transparent, impurities will dye it into gray, gray green, light yellow, milky white, black and so on. Vitreous luster. Streaks white. Hardness 1.5~2.0. The specific gravity is 1.48. It has a slightly bitter and salty taste. It loses water of crystallization at 100°C. It gradually loses water in dry air and turns into white powder anhydrous Glauber's salt. When burning, the flame is dark yellow. Soluble in water and glyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00C01D5/16
Inventor 苟兴无刘泽民张大明刘文良余大海
Owner 四川省川眉芒硝有限责任公司
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