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A process for producing high-purity refined salt by using selective electrodialysis to concentrate brine

An electrodialysis and selective technology, which is applied in general water supply saving, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of high impurity content in concentrated brine, and achieve the effect of improving product quality

Active Publication Date: 2021-03-26
QUANZHOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention aims at the current product demand for producing high-purity salt from seawater, and the problem of high impurity content in concentrated brine caused by the difficult removal of potassium ions existing in the prior art, and proposes a process and system for producing high-purity refined salt by using selective electrodialysis concentrated brine , first use the potassium removal system to remove potassium ions, and then selectively concentrate sodium chloride through monovalent selective electrodialysis to basically remove the interference of all impurity ions, obtain high-purity refined salt, and improve the grade of refined salt products

Method used

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  • A process for producing high-purity refined salt by using selective electrodialysis to concentrate brine

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Embodiment 1

[0023] The influent water in this embodiment is seawater outside Quanzhou Bay, Cl - Content 17.01 g / L, Ca 2+ Content 0.71 g / L, Mg 2+ Content 0.95 g / L, SO 4 2- Content 1.23 g / L, Na + Content 8.75 g / L, K + Content 0.37 g / L.

[0024] Potassium removal process: Control seawater to be pumped into the ion exchange column equipped with modified sodium clinoptilolite at a flow rate of 15 m / h for potassium ion adsorption, so that the potassium ion content in potassium-poor seawater after adsorption is less than 0.01 g / L After the adsorption is completed, the saturated brine obtained by saturated halide salts is eluted with a flow rate of 5 m / h to obtain a potassium-rich liquid, wherein the content of potassium ions is 19.34 g / L.

[0025] Electrodialysis concentration process: pump potassium-poor seawater with a pH of 6 into the electrodialyzer, and control the recovery rate of the electrodialyzer by adjusting the operating voltage and water inflow. Under the condition of 50%, the...

Embodiment 2

[0028] The influent in this embodiment is seawater outside the Bohai Bay, Cl - Content 19.56 g / L, Ca 2+ Content 0.41 g / L, Mg 2+ Content 1.29 g / L, SO 4 2- Content 2.35 g / L, Na + Content 11.32 g / L, K + Content 0.41 g / L.

[0029] Potassium removal process: Control seawater to be pumped into the ion exchange column equipped with modified sodium clinoptilolite at a flow rate of 18 m / h for potassium ion adsorption, so that the potassium ion content in potassium-poor seawater after adsorption is less than 0.02 g / L After the adsorption is completed, the saturated brine obtained by saturated halide salts is eluted with a flow rate of 4 m / h to obtain a potassium-rich liquid, wherein the potassium ion content is 20.25 g / L.

[0030] Electrodialysis concentration process: pump potassium-poor seawater with pH adjusted to 5 into the electrodialyzer, and control the recovery rate of the electrodialyzer by adjusting the operating voltage and water inflow. Under the condition of 45%, the ...

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Abstract

The invention belongs to the technical field of preparing salt from seawater, and relates to a process for producing high-purity refined salt by utilizing selective electrodialysis concentration of brine. The method comprises the following steps: a potassium removal process: concretely a potassium-rich solution and potassium-poor seawater are obtained after potassium ion adsorption and elution arecarried out on seawater by using a potassium removal system, the pH value of the potassium-rich seawater is regulated, and then the potassium-rich seawater is taken as electrodialysis inflow water; an electrodialysis concentration process: concretely concentration treatment is carried out on the electrodialysis inflow water by adopting a monovalent selective ion exchange membrane, the electrodialysis water inlet water is treated by the using an electrodialysis concentration process, and then desalted seawater and concentrated brine are obtained; and a crystallization process: concretely evaporative crystallization treatment is carried out on the concentrated brine obtained in the electrodialysis concentration process, and then the high-purity refined salt is obtained. Through the adoptionof the method disclosed by the invention, a raw material for preparing potassium chloride can be obtained, and potassium ions in a raw material liquid can also be removed, so that the problem of poorselectivity of electrodialysis concentration on sodium ions and potassium ions is effectively solved, the quality of brine and refined salt is further improved, and the high-purity refined salt is obtained.

Description

technical field [0001] The invention belongs to the technical field of seawater salt production, and relates to a process for producing high-purity refined salt by using selective electrodialysis concentrated brine. Background technique [0002] Salt (sodium chloride) is known as the "mother of the chemical industry", and it is the basic raw material for the production of soda ash, caustic soda, chlorine gas, and hydrochloric acid; less nutrients. The average sodium chloride content in seawater is 2.5%, and the total amount is about 400 million tons. It is the largest chemical resource in ocean water except water. The annual consumption of sodium chloride in the world is about 200 million tons, and 1 / 3 comes from sea salt. my country's annual sea salt production is 30 million tons, ranking first in the world. At present, seawater salt production mainly includes "salt field solarization method" and "multi-stage forced evaporation method", and salt field solarization method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/06C02F1/469
CPCC01D3/06C01P2006/80C02F1/4693Y02A20/124
Inventor 袁俊生胡栋梁张英武李建阳
Owner QUANZHOU NORMAL UNIV
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