Method for producing coarse-grain special mirabilite

Abstract

The invention discloses a method for preparing coarse granule special type saltcake, which includes the following technical steps: pumping hot water at 40-70 DEG C by a pump, and forming a saltcake solution containing a plurality of impurities; concentrating for crystallization by vacuum evaporation after refining impurities; obtaining a supersaturated solution containing saltcake crystals, keeping the temperature at 10-120 DEG C, and aging for 0.5-3.0 hours; drying after centrifugal separation, processing by a fluidized bed, separating fine granule saltcake and obtaining coarse granule special type saltcake. The anhydrous coarse granule special type saltcake product obtained by the process method of the invention 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...

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] In Chinese Patent No. CN: 00112995.3, 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 and cool the nitric water. Since this method is an open technological process, at the same time, this method also It can only be produced in batches; if it is obtained like this, then it will eventually agglomerate

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