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Device and production method for increasing particle size of baking soda by adopting pre-carbonization method

A technology of pre-carbonization method and production method, which is applied in the direction of bicarbonate preparation, alkali metal carbonate shape preparation, etc., and can solve the problem that the extension of the alkali production cycle of the carbonization tower is not obvious, and the tail gas is not well utilized, operated and industrialized Difficulty in promotion and other problems, to achieve the effect of increasing product size, reducing cost, and solving the problem of mother liquor expansion

Pending Publication Date: 2018-12-11
TIANJIN BOHUA YONGLI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Solvay's technology mainly adopts the process of adding a fluidized bed crystallizer. During the production process, the supersaturated solution grows around the seed crystal. However, this process requires the construction of a specific crystallizer and the maintenance of a certain degree of supersaturation of the solution. Operation and industrialization very difficult
[0006] Our company's technology directly adopts the crystallizer method to replace the production device of the traditional carbonization tower. This production technology has not been reported at home and abroad. The requirements are relatively high, and it will take some time for large-scale industrialization
[0007] The method of adding seed crystals is mainly represented by our company’s patented technology with the application publication number of CN 104402023 B, which adopts the method of adding external seed crystals and returning a part of the crystal slurry liquid to re-carbonize at the bottom of the carbonization tower that has completed the carbonization reaction to produce granular baking soda. In the actual operation process of this method, the manual workload is large, the production efficiency of the tower is reduced, and the soda production cycle of the carbonization tower is not significantly extended, and the tail gas produced by carbonization is not well utilized.

Method used

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  • Device and production method for increasing particle size of baking soda by adopting pre-carbonization method
  • Device and production method for increasing particle size of baking soda by adopting pre-carbonization method
  • Device and production method for increasing particle size of baking soda by adopting pre-carbonization method

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Embodiment 1

[0052] The pre-carbonization method of the present invention improves the production method of baking soda product granularity, and concrete process is as follows:

[0053] (1) The mixture of industrial defective sodium carbonate and heavy ash fine powder is dissolved to form a mixed solution with a total alkalinity of 80-85tt, followed by clarification tanks and microporous filters to reduce the calcium and magnesium content in the solution to 20ppm Next, store it in the lye storage tank to obtain the lye, and then use 80-110m 3 The flow rate of / h is sent to a cleaning tower feed port, and a pre-carbonization reaction is carried out with low-concentration carbon dioxide (20%-35%) in the cleaning tower to form a supersaturated solution at a corresponding temperature, and continue to extend the reaction residence time to make the mixture A small amount of crystals are produced in the liquid until the solid-liquid ratio reaches 5%. Wherein, lye lye can be the centrifugal mothe...

Embodiment 2

[0059] The pre-carbonization method of the present invention improves the production method of baking soda product granularity, and concrete process is as follows:

[0060] (1) dissolving industrial defective sodium carbonate is made into the mixed solution that total alkalinity is 80-85tt, adopts clarifier barrel and microporous filter purification successively to make the calcium and magnesium content in the solution drop below 20ppm, obtains lye. The lye solution that industrial defective product sodium carbonate raw material dissolving adopts comes from the centrifuge mother liquor that centrifuge gets rid of in step (3)

[0061] The cleaning tower in the method of embodiment 1 is switched to a soda-making tower, replaces one of three soda-making towers, and simultaneously the soda-making tower replaced is cleaned with chemical lye, because there is residual in this soda-making tower Sodium bicarbonate crystallization, the low-concentration carbon dioxide used at this time...

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Abstract

The invention discloses a device and production method for increasing the particle size of baking soda by adopting a pre-carbonization method. The device comprises carbonization towers, the carbonization towers are divided into cleaning towers and alkali making towers, the tops of the carbonization towers are provided with tail gas discharge ports, the side surfaces of the tops of the carbonization towers are provided with feed ports, the side surfaces of the bottoms of the carbonization towers are provided with mixed gas inlets and liquid outlets, the mixed gas inlets of the carbonization towers are connected to a mixed gas inlet pipeline, the mixed gas inlet pipeline is formed by converging a low-concentration carbon dioxide pipeline and a high-concentration carbon dioxide pipeline, theliquid outlets of the carbonization towers are connected to a carbonized liquid outlet pipeline, the carbonized liquid outlet pipeline is branched into a carbonized crystal mush pipeline and a pre-carbonized crystal mush pipeline, the carbonized crystal mush pipeline is connected to a thickener through a crystal mush pump, the pre-carbonized crystal mush pipeline is connected to the feed ports ofthe carbonization towers through an alkali liquid pump; the feed ports of the carbonization towers are connected to an alkali liquor pipeline, and the tail gas discharge ports are connected to tail gas emptying pipelines and a carbonized tail gas recycling pipeline. According to the device and the production method, the production cost is lowered, the process operation is simple, and the popularization is convenient.

Description

technical field [0001] The invention relates to a device for improving the particle size of reaction crystallization products, more specifically, relates to a device and a production method for improving the particle size of sodium bicarbonate by pre-carbonization. Background technique [0002] Baking soda is one of the important inorganic chemical products, widely used in many fields such as chemical industry, light industry, medicine, textile and fine chemical industry. As a country with a large production capacity of baking soda, my country's annual import and export volume reaches millions of tons. However, with the increasing demand of users and enterprises in special industries (such as feed industry and leather industry) in the market, a single domestic product is far from being able to meet the needs. Require. Compared with baking soda, which is currently mainly used in the food industry in China, these special industries have certain requirements for the particle si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/10C01D7/40
CPCC01D7/10C01D7/40C01P2004/10C01P2004/60
Inventor 庞栓林梅述钘谢智勇李满枝李治水聂增来马良丁健
Owner TIANJIN BOHUA YONGLI CHEM IND
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