Novel high-efficient energy-saving salt granulating process

Abstract

The invention discloses a novel high-efficient energy-saving salt granulating process. The process comprises the following steps of: A, preparing or selecting raw material salt, namely adding water into refined dry salt by adopting a watering system and uniformly mixing the mixture serving as the raw material salt, or selecting wet salt with the water content of below 2.5 percent; B, secondarily granulating the raw material salt obtained in the step A by using two rollers to prepare a semi-finished product; C, stabilizing and screening the semi-finished product which is subjected to double-roller granulating; and D, packaging qualified products; returning unqualified products to the watering system for re-granulating process through a returning system. The process solves the problems of insufficient product quality of granulated salt in the granulated salt industry, such as lower strength, irregular and nonuniform granules and the like, solves the problems of lower molding rate of the granulated salt products, lower energy generation and higher insufficiency of packaged powdered salt amount in production, reduces the returning rate, improves manufacture efficiency of granulation, improves the production capacity, and solves the problem that re-caking of the granulated salt affects the quality and use of the granulated salt.

Description

technical field [0001] The invention relates to a salt granulation process. Background technique [0002] Due to the chemical and physical properties of salt (that is, sodium chloride), that is, under natural conditions, salt is prone to moisture absorption and recrystallization, which makes salt agglomerate, and salt is easy to agglomerate for the production and storage of the salt industry and demand industries. , transportation, application and other links cause increased production costs and technical difficulties, so the salt is often granulated. After the salt is granulated, it can prevent the salt from agglomerating due to moisture absorption and recrystallization. [0003] At present, the particle size of salt particles produced by general vacuum salt production technology is less than 1.0mm, so the specific surface area of ​​salt is large, and the contact area between particles is also large, which is easy to absorb moisture in the air and recrystallize and agglomer...

AI Technical Summary

Problems solved by technology

Its disadvantages are: ①The particles of the granulated product are irregular and uniform, which will cause the granulation to agglomerate again; ②It is inconvenient to maintain the equipment; ③The production capacity is low; ④There is a forced feeding system and a cooling system, and the energy consumption is high; ⑤The input cost is high , takes up a lot of space; ⑥The whole set of process equipment is huge and diverse

[0008] According to the above-mentioned existing domestic and foreign granulation technology process, on the one hand, dry granulation is easy to generate a large amount of dust, and the obtained product has low strength and low molding rate, which leads to low production efficiency, high energy consumption, and lack of a complete set of It conforms to the whole set of process technology and equipment of salt granulation. The granulation products are irregular and uniform, and the quality of granulation products is at the low end. On the other hand, although wet granulation can avoid a large amount of dust and improve strength, but the Some wet granulation methods add binders. Since salt is a kind of food, this method of adding binders is limited in salt granulation because various binders will pose a threat to human health. How to use wet granulation and avoid harm to the human body has always been a problem that people have been eager to solve but have not been able to solve

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