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Improved combined-soda filter method

A filtration method and combined alkali technology, applied in carbonate preparations and other directions, can solve the problems not mentioned, and achieve the effect of reducing the equivalent of washing water, eliminating the factors of unreasonable configuration, and solving the swelling of the production mother liquor.

Active Publication Date: 2014-02-05
TIANJIN BOHUA YONGLI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method does not mention the method that can not only solve the expansion of the production mother liquor but also ensure the low salt content

Method used

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  • Improved combined-soda filter method

Examples

Experimental program
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Effect test

Embodiment 1

[0019] The sodium bicarbonate magma suspension taken out from the combined alkali carbonization tower is sent to a horizontal belt filter for solid-liquid separation, and washing water is used to wash the solid-liquid separation, and the sodium bicarbonate magma suspension is The average diameter of the sodium bicarbonate crystals in the medium is 100 microns, and the temperature of the sodium bicarbonate magma suspension is 38° C., and the distance from the feed end of the horizontal belt filter to the blind plate of the horizontal belt filter is the same as that of the filter The length ratio of the total filter surface is 7 / 24, and the position of the first washing water pipe is set at 2.2m in front of the blind plate.

[0020] After testing: when the actual production volume of the belt machine is lower than the maximum design volume, and the washing water equivalent is controlled within the range of 0.49-0.52 cubic meters per ton of soda ash product, the salt content of th...

Embodiment 2

[0022] The sodium bicarbonate magma suspension taken out from the combined alkali carbonization tower is sent to a horizontal belt filter for solid-liquid separation, and washing water is used to wash the solid-liquid separation, and the sodium bicarbonate magma suspension is The average diameter of the sodium bicarbonate crystals in the medium is 150 microns, and the temperature of the sodium bicarbonate slurry suspension is 42° C., and the distance from the feed end of the horizontal belt filter to the blind plate of the horizontal belt filter is the same as that of the filter The length ratio of the total filter surface is 1 / 3, and the position of the first washing water pipe is set 2.5m in front of the blind plate.

[0023] After testing: when the production capacity of the belt machine reaches the maximum designed amount, when the washing water equivalent is controlled within the range of 0.50-0.54 cubic meters per ton of soda ash product, the salt content of the product c...

Embodiment 3

[0025] The sodium bicarbonate magma suspension taken out from the combined alkali carbonization tower is sent to a horizontal belt filter for solid-liquid separation, and washing water is used to wash the solid-liquid separation, and the sodium bicarbonate magma suspension is The average diameter of the sodium bicarbonate crystals in the medium is 130 microns, and the temperature of the sodium bicarbonate magma suspension is 40° C., and the distance from the feed end of the horizontal belt filter to the blind plate of the horizontal belt filter is the same as The length ratio of the total filter surface is 1 / 4, and the position of the first washing water pipe is set 2m before the blind plate.

[0026] After testing: when the production capacity of the belt machine reaches the maximum designed amount, the washing water equivalent is controlled to the range of 0.52-0.54 cubic meters per ton of soda ash product, and the salt content of the product can reach the national Class II e...

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Abstract

The invention discloses an improved combined-soda filter method. The improved combined-soda filter method comprises the following steps of: feeding sodium bicarbonate crystal slurry suspension liquid taken out from a combined-soda carbonizing tower into a horizontal belt type filter to carry out solid-liquid separation; and carrying out washing by adopting washing water while carrying out solid-liquid separation, wherein average diameter of the sodium bicarbonate crystal in the sodium bicarbonate crystal slurry suspension liquid is 100 microns -150 microns, temperature of the sodium bicarbonate crystal slurry suspension liquid is 38 DEG C-42 DEG C, ratio of a distance from a charging end of the filter to a blind plate of the horizontal belt type filter to length of the total filter surface of the filter is 1 / 4-1 / 3, and the first washing water pipe is arranged at a position 2m-2.5m in front of the blind plate. The improved combined-soda filter method disclosed by the invention eliminates unreasonable factors in configuration of filter equipment, lowers equivalent weight of the washing water, not only can solve mother liquor swelling, but also can ensure low salinity of the product.

Description

technical field [0001] The invention relates to a filtration method, and in particular, the invention relates to an improved combined alkali filtration method. Background technique [0002] A horizontal belt vacuum filter is used for solid-liquid separation in the first process of combined alkali production. As shown in the figure, the core component of the horizontal belt filter is the filter rubber belt, and the filter cloth 1 is spread on the belt filter surface. There are horizontal grooves on the outer surface of the belt filter, and the grooves are inclined from both sides of the belt to the middle, which is beneficial to the discharge of the filtrate. There is a row of small holes evenly spaced in the middle of the belt, and the bottom of the small holes leads to the vacuum plate 2. The vacuum plate and the belt are separated by The wear-resistant belt is sealed. During production, the filter cloth, rubber belt and wear-resistant belt slide on the vacuum plate togethe...

Claims

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Application Information

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IPC IPC(8): C01D7/18
Inventor 胡东岭张福进冯玉岷杨双英景喜中
Owner TIANJIN BOHUA YONGLI CHEM IND