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Method for improving brine processing capability of brine preprocessor

A pre-processor, brine technology, applied in the direction of electrolysis components, electrolysis process, etc., can solve the problems of reducing water output and incomplete pre-treatment, etc.

Active Publication Date: 2011-08-03
SHANDONG DONGYUE FLUO SILICON MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the amount of brine treatment increases, it will reduce the time of reaction and pretreatment, resulting in incomplete reaction and pretreatment, which will affect the refining effect. Therefore, the treatment amount must be kept basically stable, but the quality of raw salt is unstable, especially when the content of Ca and Mg exceeds the standard. If it is too large, maintaining the original treatment capacity will not be able to meet the demand for brine, so to ensure qualified brine, it is necessary to reduce the amount of brine output once

Method used

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  • Method for improving brine processing capability of brine preprocessor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) After the light brine and steam condensate returned by electrolysis are mixed in the water distribution tank, they are pumped to the salt tank for salt conversion;

[0022] 2) Add refined agent A (caustic soda) and refined agent B (sodium hypochlorite) to the coarse saturated brine coming out of the salt tank when it flows through the baffle tank; enter the front reaction tank, the Mg content of the front reaction tank is 250ppm, and pump it to the pre-reaction tank after the reaction is completed. In the processor, the salt mud is removed according to the principle of stratification of insoluble substances with different specific gravity;

[0023] 3) After the desilting in the preprocessor is completed, 10% of the crude saturated brine flows back to the front reaction tank through the pipeline; 90% of the crude saturated brine flows into the rear reaction tank and adds refined preparation C (sodium carbonate), and after the reaction, enters the brine Membrane filter...

Embodiment 2

[0027] Others are the same as embodiment 1. The difference is:

[0028] The Mg content in the reaction tank before the primary brine section is 380ppm, the crude brine pump flow rate is increased by 30%, the preprocessor reflux regulating valve is 30% year-on-year, the preprocessor inlet membrane filter flow rate is kept constant, and the preprocessor outlet Mg is analyzed Content 18ppm, membrane filter outlet brine Ca+Mg<1ppm.

Embodiment 3

[0030] Others are the same as embodiment 1. The difference is: refining agent A is soda ash, refining agent B is sulfuric acid, and refining agent C is caustic soda.

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Abstract

The invention discloses a method for improving the brine processing capability of a brine preprocessor through a brine membrane filtering process, and refining agents A and B are added into saturated crude brine to enter a forward reaction barrel, and then the crude brine after reaction enters the preprocessor. After being preprocessed through the preprocessor under the condition of back mixing, the partial crude brine returns the forward reaction barrel through a reflux regulating valve and is then transported to the preprocessor by simultaneously improving the flow capability of a crude brine pump, a refining agent C is added into the preprocessed crude brine to enter a membrane filter after reaction, and refined brine is discharged through a clear solution cavity of the membrane filterand then enters a refined brine tank after an amount of sodium sulfite is added to remove free chlorine. The invention ensures the stable water outlet of one-time refined brine by improving the brineprocessing capability of the brine preprocessor under the condition of crude salt quality fluctuation, achieves the purpose of stabilizing the running of a caustic soda device, and is simple and feasible.

Description

Technical field: [0001] The invention relates to a process for treating primary brine with ionic membrane caustic soda, in particular to the improvement of the magnesium removal ability of a preprocessor, which expands the purchasing range of raw salt. Background technique: [0002] Membrane filtration process is currently popular and widely used in the production of primary brine by ionic membrane caustic soda. The key to the treatment of brine lies in the magnesium removal effect and ability of the preprocessor. After salting, the saturated crude brine is added with sodium hypochlorite in proportion. , sodium hydroxide and other refined preparations are stirred in the front reaction tank, and the reaction time is controlled at 30 minutes; at the same time as the preprocessor, iron salt pretreatment agent is added in proportion, and sodium carbonate is added to the brine after pretreatment. The reaction time is controlled in 30 minutes. Iron salt is another key agent to en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B15/08C25B1/34
Inventor 魏军海张秀伸朱永田
Owner SHANDONG DONGYUE FLUO SILICON MATERIALS CO LTD