Method for improving mother solution salinity and reducing pure alkali loss

Abstract

The invention discloses a method for improving mother solution salinity and reducing pure alkali loss, which comprises the following steps of: controlling the salinity of heavy pure alkali mother solution to be 60 to 110 grams per liter, and adding washing water into crystallized monohydrate sodium carbonate slurry to remove a part of salt and impurities from monohydrate sodium carbonate filter cakes when the slurry enters a centrifugal machine to perform solid-liquid separation, wherein the adding amount of the washing water for washing the monohydrate sodium carbonate filter cakes is 45 to 150 kilograms per ton of heavy pure alkali. Compared with the prior art, the method has the advantage that: the heavy pure alkali product quality can be ensured and the pure alkali loss can be reduced by reasonably controlling the adding amount of the washing water and the salinity of the heavy pure alkali mother solution. The salt mass content index of the product produced by adopting the method is below 0.25 percent, the moisture mass content index is below 5 percent, the alkali consumption is reduced by over half, and the energy consumption is slightly increased.

Description

technical field [0001] The invention relates to a method for reducing the loss of soda ash, in particular to a method for increasing the salt content of mother liquor and reducing the loss of 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 solid-phase hydration makes the particle size of heavy soda ash uneven, and the manufacturing cost is relatively high. The product obtained by liquid phase hydration has uniform particle size, low salt content, and adjustable particle size distribution, so it is widely used. The produ...

AI Technical Summary

Problems solved by technology

Since the salt content in the heavy ash mother liquor is usually 20-40 g / L, and the soda ash content is up to 300 g / L, a large amount of soda ash must be delivered outside the high-salt mother liquor. If this part of soda ash cannot be recycled, the loss will be huge. very big

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