Process and device for producing pyrotechnite from sodium sulfate decahydrate

Abstract

The invention relates to a process and a device for producing pyrotechnite from sodium sulfate decahydrate. The process comprises the following steps of: (1) putting the sodium sulfate decahydrate into a hot melting tank for hot melting to form solution of sodium sulfate; (2) heating the solution of sodium sulfate, conveying the solution of sodium sulfate to an evaporator, concentrating and evaporating the solution of sodium sulfate, and crystallizing and precipitating part of anhydrous sodium sulfate; (3) compressing secondary steam of the evaporator, conveying the compressed steam to a heating chamber of the evaporator; and (4) performing solid-liquid separation on the dissolved solution of sodium sulfate to obtain solid anhydrous sodium sulfate, and drying, weighing and packaging. The device comprises the heat melting tank, a liquor storage tank, a feed delivery pump, a heat exchanger and the evaporator which are connected sequentially, wherein the evaporator is sequentially connected with a centrifugal machine, a mother liquor tank, a mother liquor pump and a feed inlet of the evaporator; and the evaporator is provided with a vacuum pump, and a steam outlet of the evaporator is connected with a separator, a compressor and the heating chamber of the evaporator. In the process and the device, the sodium sulfate decahydrate is subjected to melting evaporation through the technology of steam compression, so the evaporating energy consumption can be reduced, and the purity of products can reach over 99 percent; and the process and the device require investments, are high in economic benefits and save energy greatly.

Description

technical field [0001] The invention relates to the field of chemical technology and equipment technology, in particular to a technology for producing anhydrous Glauber's salt from sodium sulfate decahydrate and a device used in the technology. Background technique [0002] Existing chemical enterprises generally use sodium sulfate decahydrate (sodium sulfate decahydrate) to produce anhydrous thenardite in the following ways: steam heating, heat pipe heating, and hot air drying. Existing chemical enterprises need to consume 1 ton of anhydrous thenardite Steam 0.8-1.6 tons, power consumption 40-60kwh. Existing large-scale multi-effect evaporators have relatively low energy consumption, usually consuming 0.6-1.2 tons of steam, but large-scale multi-effect evaporators require a large investment scale, occupy a large area, and have complex structures. [0003] At present, there are many domestic chemical enterprises that produce thenardite by-products. These enterprises have li...

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Problems solved by technology

[0002] Existing chemical enterprises generally use sodium sulfate decahydrate (sodium sulfate decahydrate) to produce anhydrous thenardite in the following ways: steam heating, heat pipe heating, and hot air drying. Existing chemical enterprises need to consume 1 ton of anhydrous thenardite Steam 0.8-1.6 tons, power consumption 40-60kwh

Existing large-scale multi-effect evaporators have relatively low energy consumption, usually consuming 0.6-1.2 tons of steam, but large-scale multi-effect evaporators require large investment, large floor space, and complex structures

[0003] At present, there are many domestic chemical enterprises that produce thenardite by-products. These enterprises have limited production capacity of thenardite and cannot invest in large-scale equipment, resulting in high energy consumption for the production of thenardite, and even the inability to process the by-product thenardite, resulting in low economic benefits for enterprises.

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