Production technology of potassium sulfate

Abstract

The invention provides a production technology of potassium sulfate. The production technology comprises the following steps that ammonium sulfate is dissolved with mother liquor II and condensation water and then fed into a mixing reactor; potassium chloride is added into the mixing reactor, and slurry obtained after ammonium sulfate liquor and potassium chloride are fully mixed and react is centrifuged, filtered and separated to obtain mother liquor I and crude potassium sulfate; the mother liquor I is subjected to concentration, cooling crystallization and centrifugal separation to obtain potassium ammonium chloride and mother liquor III; the mother liquor III is fed into a concentration work section to be cyclically used, one part of condensation water generated through concentration is used for dissolving ammonium sulfate, and the other part of condensation water is cooled by a heat exchanger and then used for washing a crude potassium sulfate product, and the crude potassium sulfate product obtained after washing is subjected to centrifugal separation and drying to obtain the potassium sulfate product and the mother liquor II. According to the method, the adopted raw materials are cheap and easy to obtain, and therefore the production cost is low; in addition, the whole production technology is totally closed and cyclic, three wastes are not generated, and therefore the technology is a pure green technology.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for producing potassium sulfate, in particular to a method for producing potassium sulfate by using ammonium sulfate and potassium chloride. Background technique [0002] Potassium sulfate, as an important chlorine-free high-quality potassium fertilizer, also contains sulfur elements needed by crops, and is widely used in agricultural production, such as tobacco, citrus, tea, grapes, sugar beets, etc. It can not only improve the quality of agricultural products, but also improve its quality. However, potash is a non-renewable resource, and its distribution in the world is extremely uneven. Canada and the former Soviet Union accounted for 40% and 37% of the world's total potash resources, respectively. [0003] With the development of agriculture, China's demand for potash is increasing every year, and the huge demand gap provides a broad prospect for the potash m...

AI Technical Summary

Problems solved by technology

Disclose a kind of production method of potassium sulfate in the production method of potassium dihydrogen phosphate, potassium sulfate and application number of 90105324.4 in the production method of potassium dihydrogen phosphate, potassium sulfate and application number of 89106858.9, its method is First prepare a circulating solution containing sodium nitrate, heat the circulating solution and fertilizer potassium chloride to precipitate sodium chloride, cool down the mother liquor after separating sodium chloride to precipitate potassium chloride, and react the mother liquor after separating potassium chloride with ammonium sulfate to produce Potassium sulfate, the mother liquor is recycled. In this method, it is necessary to produce intermediates first, and then prepare potassium sulfate through the intermediates. The process is complicated

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