Refining system and method for by-product brine

A refining method and refining system technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of complex operation control, low production efficiency, long process, etc., to achieve a short process and improve production efficiency. , the effect of promoting crystal growth

Inactive Publication Date: 2020-01-17
QINGHAI SALT LAKE IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a refining system and refining method of by-product brine, which is used to solve the technical problems of long process flow, slow filtration, complicated operation control and low production efficiency in the existing primary brine refining process

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  • Refining system and method for by-product brine
  • Refining system and method for by-product brine
  • Refining system and method for by-product brine

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Embodiment Construction

[0035] The present invention provides many applicable inventive concepts that can be embodied in numerous specific contexts. The specific examples described in the following embodiments of the present invention are only used as illustrations of specific embodiments of the present invention, and are not intended to limit the scope of the present invention.

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] The invention provides a method for refining the by-product brine, which is used for refining the by-product brine produced in the production process of magnesium hydroxide, which can be used as primary brine for the production of caustic soda by ion membrane method, or for other products that use sodium chloride as raw material. The production unit provides qualified sodium chloride raw materials.

[0038] The following describes a method for refining by-product brine in a preferred...

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Abstract

The invention discloses a refining method of by-product brine, which comprises the following steps of: generating by-product brine in the production process of magnesium hydroxide; adding sodium hydroxide and sodium carbonate to by-product brine to form calcium carbonate precipitate and magnesium hydroxide precipitate to obtain a first brine; adding polyaluminum chloride into the first brine for bridging to generate flocs to obtain the second brine; adding polyacrylamide to the second brine so that flocs particles gather to obtain brine slurry; The brine slurry is precipitated to obtain supernatant and bottom slurry, and filtering the supernatant to obtain primary brine. In the present invention, sodium hydroxide and soda ash are used as precipitants, the magnesium ions are precipitated asmagnesium hydroxide, the calcium ions are precipitated as calcium carbonate, polyaluminium chloride plays a flocculation bridging role to generate flocs and precipitate, while polyacrylamide plays acoagulation role to aggregate flocs particles. The addition of polyacrylamide and polyaluminium chloride promotes the formation and separation of precipitates, so that calcium and magnesium ions in by-product salt water are removed as much as possible.

Description

technical field [0001] The invention relates to the technical field of brine refining, in particular to a system and method for refining by-product brine. Background technique [0002] In the process of developing potassium chloride resources in Chaerhan Salt Lake, a large amount of magnesium chloride will be produced as a by-product. The reaction between sodium hydroxide solution and magnesium chloride solution can produce magnesium hydroxide products. Saturated sodium chloride solution can be sent to the caustic soda plant as primary brine to continue electrolytic soda production, increasing the added value of products and realizing circular economy. [0003] In the chlor-alkali industry, the preparation of primary brine is a crucial process in the ion-exchange membrane alkali production process, and the quality of the refining effect directly affects the quality and output of the product. Studies have shown that the most obvious effect on the performance of ion-exchange ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/122C02F101/10
CPCC02F1/001C02F1/5236C02F1/56C02F1/66C02F9/00C02F2001/007C02F2101/10
Inventor 马小龙叶发宝许涛年勇鑫张丽丽赵凤辉
Owner QINGHAI SALT LAKE IND
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