A circulating fluidized bed decomposition crystallization device and decomposition crystallization method

Abstract

A circulating fluidized bed decomposing and crystallizing device and a decomposing and crystallizing method, comprising a decomposing and crystallizing device body, a mother liquid overflow tank is arranged on the upper part of the decomposing and crystallizing device body, an inner guide tube and an outer guide tube are arranged in the decomposing and crystallizing device body, The lower part of the crystallization device is provided with a crystal slurry discharge pipe, and the bottom of the decomposition crystallization device body is provided with a liquid replenishment port. The decomposition crystallization device body is provided with a main stirring device. A liquid distribution plate is provided in the body of the crystallization device, and the liquid distribution plate is located between the crystal slurry discharge pipe and the liquid replenishment port; the present invention also includes a circulating fluidized bed decomposition and crystallization method, which can be used for light halogen Stone decomposition and crystallization to prepare potassium chloride can also be used in the crystallization production of potassium chloride and sulfate double decomposition crystallization to prepare potassium sulfate, reduce the aspect ratio of the decomposition crystallization device, and increase the average particle size of the product while reducing the entrainment rate of raw materials.

Description

technical field [0001] The invention relates to a circulating fluidized bed, in particular to a circulating fluidized bed decomposing and crystallizing device and a decomposing and crystallizing method. Background technique [0002] my country is a large agricultural country and has a large demand for potash fertilizers. However, the output of my country's potash salt industry is far from meeting the needs of agriculture. Nearly 50% of potash salt still needs to be imported from abroad, and the dependence on foreign countries is extremely high. [0003] The decomposition and crystallization device commonly used in the potassium salt industry is a variant of the DTB type decomposition and crystallization device in the development of the potassium salt industry. It is mainly used for the dissolution and crystallization of low-sodium carnallite to prepare potassium chloride and double salt and chlorine containing magnesium sulfate. Potassium sulfate is prepared by metathesis of...

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Problems solved by technology

[0004] CN2678736Y discloses a push-up and lift-down mixed decomposition type crystallizer, and CN103073030B discloses a decomposition and crystallization device for hydrolyzing carnallite, but none of them focuses on solving the relative separation of crystallization raw materials and crystallization products during crystallization production , and does not solve the problem of circular crystallization of large particle raw materials; CN105597363B discloses a mechanical decomposition and crystallization device for potassium salt industry. The bottom of the inner cylinder is provided with a bowl-shaped baffle to reduce the entrainment of raw materials in the product, but the structure of the baffle It is easy to form a "dead zone" for material accumulation on the lower side of the stirring shaft, occupying the internal space of the decomposition and crystallization device to form an inefficient area, and once the "dead zone" is formed, the existence of the bowl-shaped baffle will no longer be able to prolong the undissolved The purpose of raw material residence time; CN110229024A discloses a kind of decomposition crystallizer for potassium salt industry, introduces liquid distribution device and diversion cone in the middle and lower part of the crystallizer, and introduces the mode of local upward flow in the crystallizer to reduce the entrainment of raw materials in the product , but the device requires a large amount of mother liquid circulation during normal operation, and the existence of the liquid distribution device and the diversion cone will greatly increase the aspect ratio of the device

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