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Method for preparing refined strong brine by removing potassium from strong brine

A technology of concentrated brine and potassium ions, which is applied in the field of preparing refined concentrated brine, can solve the problems of refined concentrated brine that have not been seen yet, and achieve the effects of low K+ content, simple process and low cost

Active Publication Date: 2012-10-17
河北八维化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no information on the removal of K from concentrated brine obtained after electrodialysis. + Literature Report on Preparation of Refined Concentrated Brine

Method used

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  • Method for preparing refined strong brine by removing potassium from strong brine
  • Method for preparing refined strong brine by removing potassium from strong brine
  • Method for preparing refined strong brine by removing potassium from strong brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The first step is to use an ion exchange column filled with modified zeolite to remove potassium by adsorption of raw concentrated brine

[0020] At 25°C, the concentrated brine obtained after electrodialysis of the raw material is passed into an ion exchange column filled with modified zeolite for adsorption reaction. The ion exchange column filled with modified zeolite is separated by 9 single ion exchange columns. It consists of 3 operating units, each single ion exchange column is composed of 800g of modified zeolite packed in a column with a diameter of 36mm and a height of 1000mm, and 3 ion exchange columns are set as an operating unit. Using the simulated moving bed technology to absorb the concentrated brine of the raw material, the potassium ions in the concentrated brine of the raw material exchange completely with the sodium ions on the modified zeolite. One operating unit, each operating unit is fed with 3L of concentrated brine, the adsorption flow rate of ...

Embodiment 2

[0028] The first step is to use an ion exchange column filled with modified zeolite to remove potassium by adsorption of raw concentrated brine

[0029] At 15°C, feed the raw brine into the ion-exchange column filled with modified zeolite for adsorption reaction. The ion-exchange column filled with modified zeolite is composed of 12 single ion-exchange columns divided into 4 operating units. Each single ion exchange column is composed of 800g of modified zeolite packed in a column with a diameter of 36mm and a height of 1000mm, and 3 ion exchange columns are set as an operation unit. Use the simulated moving bed technology to absorb the concentrated brine of the raw material, and the potassium ions in the concentrated brine of the raw material exchange completely with the sodium ions on the modified zeolite. One operating unit, each operating unit is fed with 8L of concentrated brine, the adsorption flow rate of the raw concentrated brine, that is, the empty tower flow rate, i...

Embodiment 3

[0037] The first step is to use an ion exchange column filled with modified zeolite to remove potassium by adsorption of raw concentrated brine

[0038] At 40°C, the raw brine is passed into the ion exchange column packed with modified zeolite for adsorption reaction. The ion exchange column packed with modified zeolite is composed of 6 single ion exchange columns divided into 2 operating units. Each single ion exchange column is composed of 800g of modified zeolite packed in a column with a diameter of 36mm and a height of 1000mm, and 3 ion exchange columns are set as an operation unit. Use the simulated moving bed technology to absorb the concentrated brine of the raw material, and the potassium ions in the concentrated brine of the raw material exchange completely with the sodium ions on the modified zeolite. One operating unit, each operating unit is fed with 21L of concentrated brine, the adsorption flow rate of the raw concentrated brine, that is, the empty tower flow ra...

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Abstract

The invention provides a method for preparing refined strong brine by removing potassium from strong brine, and relates to a method for removing potassium from strong brine. The method comprises the following steps of: under the temperature of 15-40DEG C, introducing raw material strong brine into an ion exchange column filled with modified zeolite to carry out an adsorbing reaction, adsorbing the raw material strong brine by an analogue moving bed technology till exchange reaction between the potassium ions in the raw material strong brine and the sodium ions on the modified zeolite is completed, and adsorbing to obtain the refined strong brine of which the K<+> content is 0.10g / L-0.39g / L; and eluting potassium ions in the ion exchange column after adsorption in the first step by taking saturated sodium chloride solution as eluant under the temperature of 25-95DEG C, so that the potassium-rich solution of which the potassium ion concentration is 10.23g / L-12.67g / L can be obtained, and the ion exchange column can be recycled after being eluted by the saturated sodium chloride solution. According to the method provided by the invention, the potassium ions in the electrically-dialysed strong brine can be effectively removed, and the qualified brine which meets the requirement of the chlor-alkali industry can be prepared.

Description

technical field [0001] The technical scheme of the present invention relates to removing potassium from brine, in particular to a method for preparing refined concentrated brine by removing potassium from concentrated brine. Background technique [0002] There are two main uses of refined concentrated brine, one is for salt production, and the other is for chlor-alkali industry. Since the main source of salt is seawater, with the aggravation of land use in coastal areas, industrialized salt production will eventually replace traditional sun-dried salt, especially with the development of large-scale seawater desalination industry, using seawater or concentrated seawater as raw material, electrodialysis The factory salt production model represented by liquid salt production will be gradually adopted. The concentrated brine obtained after electrodialysis generally contains a small amount of K + , Ca 2+ , Mg 2+ and SO 4 2- , Ca in brine 2+ , Mg 2+ and SO 4 2- The remov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06C01D3/16
Inventor 袁俊生纪志永郭小甫谢英惠刘杰王军
Owner 河北八维化工有限公司
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