Production process of heavy soda ash

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...

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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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