Production process of heavy soda ash

A technology of heavy soda ash and production method, applied in chemical instruments and methods, alkali metal compounds, alkali metal carbonates, etc., can solve the problems of high manufacturing cost, short service life of crystallizer, difficult control of salt content and other impurities, etc. problems, to achieve the effect of low salt and other impurities, bright particle surface, easy production control

Inactive Publication Date: 2006-12-20
TIANJIN BOHUA YONGLI CHEM IND
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Problems solved by technology

Nowadays, the production of heavy soda ash mostly adopts solid-phase hydration method. Due to the limitation of its process, the production of heavy soda ash by solid-phase hydration makes the particle size of heavy soda ash uneven, and the manufacturing cost is high. In addition, the salt content of alkali and other impurities It is not easy to control, and the general liquid phase hydration method can obtain heavy soda ash with uniform particle size and low salt content, but the particle size distribution of sodium carbonate monohydrate is difficult to adjust, and because it is difficult to eliminate the condensation and condensation of sodium carbonate monohydrate crystals Block phenomenon, so in the general liquid phase hydration production process, the crystallizer is easy to scar, resulting in a very short life cycle of the crystallizer, generally 6-7 hours

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  • Production process of heavy soda ash
  • Production process of heavy soda ash
  • Production process of heavy soda ash

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Add light soda ash and saturated sodium carbonate solution with a weight ratio of 1:0.7 into the hydration crystallizer, and carry out hydration reaction at a temperature of 95° C. for 5 minutes. The solid-liquid volume ratio of the crystal slurry after hydration is 25%, and the crystal slurry after the hydration reaction is sent to a thickener for thickening until the solid-liquid volume ratio is 35%, and then enters the centrifuge for dehydration. The washing water from the water head tank is used to wash the filter cake in the centrifuge, and the washing water volume is 230kg / t 重质纯碱 Wash away the salt and other impurities in the monohydrate alkali, control the free water content of the dehydrated monohydrate alkali at 2.8%, and finally enter the heavy soda ash furnace for calcination, and carry out particle size screening and cooling after the furnace to obtain low salt weight quality soda ash. Heavy soda ash has a uniform particle size as crystals (see Table 1 for ...

Embodiment 2

[0016] Add light soda ash and saturated sodium carbonate solution with a weight ratio of 1:0.8 into the hydration crystallizer, and carry out hydration reaction at a temperature of 105° C. for 8 minutes. The solid-liquid volume ratio of the crystal slurry after hydration is 30%, and the crystal slurry after the hydration reaction is sent to a thickener for thickening until the solid-liquid volume ratio is 40%, and then enters the centrifuge for dehydration. The washing water from the water head tank is used to wash the filter cake in the centrifuge, and the washing water volume is 240kg / t 重质纯碱 Wash away the salt and other impurities in the monohydrate alkali, control the free water content of the dehydrated monohydrate alkali at 2.5%, and finally enter the heavy soda ash furnace for calcination. quality soda ash. The particle size of heavy soda ash is uniform as crystals (the particle size distribution is shown in Table 1), and the service life of the hydration crystallizer i...

Embodiment 3

[0018] Add light soda ash and saturated sodium carbonate solution with a weight ratio of 1:1 into the hydration crystallizer, and carry out hydration reaction at a temperature of 100° C. for 10 minutes. The solid-liquid volume ratio of the crystal slurry after hydration is 35%, and the crystal slurry after the hydration reaction is sent to a thickener for thickening until the solid-liquid volume ratio is 45%, and then enters the centrifuge for dehydration. The washing water from the water head tank is used to wash the filter cake in the centrifuge, and the washing water volume is 245kg / t 重质纯碱 Wash away the salt and other impurities in the monohydrate alkali, control the free water content of the dehydrated monohydrate alkali at 1.5%, and finally enter the heavy soda ash furnace for calcination. quality soda ash. Heavy soda ash has a uniform particle size as crystals (see Table 1 for its particle size distribution), and the service life of the hydration crystallizer is 8 days....

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Abstract

The production process of heavy sodium carbonate includes the following steps: hydration and crystallization of light sodium carbonate and saturated sodium carbonate solution in a hydration crystgallizer for 5-10 min, densifying the crystal slurry after hydration in a densifier; solid-liquid separation in a centrifugal while adding water to wash off partial salt and impurity; calcining in a heavy sodium carbonate calcining furnace, sieving, and cooling to obtain heavy sodium carbonate. The said process can obtain product with homogeneous grain size, low salt content and less scaling in the crystallizer.

Description

technical field [0001] The invention relates to a production method of soda ash, in particular to a production method of heavy soda ash. Background technique [0002] At present, heavy soda ash has replaced light soda ash as industrial raw material in many places. Heavy soda ash has certain particles and can still maintain satisfactory fluidity and reduce dust flying and environmental pollution. It is convenient for unloading, transportation and automatic metering. . Nowadays, the production of heavy soda ash mostly adopts the solid-phase hydration method. Due to the limitation of its process, the production of heavy soda ash by the solid-phase hydration method makes the particle size of heavy soda ash uneven, and the manufacturing cost is high. In addition, the salt content of alkali and other impurities It is not easy to control, and the general liquid phase hydration method can obtain heavy soda ash with uniform particle size and low salt conten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D7/00
Inventor 张志红张再平杨昕马文卿陈学华徐健徐作庆姜德发
Owner TIANJIN BOHUA YONGLI CHEM IND
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