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Method for extracting potassium from seawater or brine

A brine and seawater technology, which is applied in seawater or brine to extract potassium and directly treat seawater or brine, can solve the problems of expensive extraction materials, large material turnover, and non-scale industrialization, etc., and achieves convenient operation, large adsorption capacity, The effect of efficient selective extraction

Inactive Publication Date: 2019-03-19
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned methods generally have problems such as large material turnover, expensive extraction materials, complicated operating procedures, high energy consumption, and high extraction costs. At present, there is no large-scale industrialization

Method used

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  • Method for extracting potassium from seawater or brine
  • Method for extracting potassium from seawater or brine
  • Method for extracting potassium from seawater or brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] According to the weight ratio of 80:10:10, 8g K 2 Ni[Fe(CN) 6 ] compound, 1g of acetylene black and 1g of PVDF were mixed evenly, and N-methylpyrrolidone (NMP) organic solvent was added to the mixed powder for grinding and slurrying, and the slurry was coated on a graphite plate and kept in a vacuum box at 110°C Dry at a constant temperature for 12 hours, and after cooling, obtain a composite membrane electrode in a reduced state, and place the potassium salt chamber in the electrochemical cell as an anode; mix 8g Ni[Fe(CN) 6 ] compound, 1g of acetylene black and 1g of PVDF were mixed evenly, NMP was added to the mixed powder for grinding and slurrying, the slurry was coated on a graphite plate, and dried at a constant temperature of 110°C in a vacuum box for 12 hours, and then oxidized The state composite membrane electrode is placed in the brine chamber in the electrochemical cell as the cathode; the schematic diagram of the top view of the electrochemical cell devic...

Embodiment 2

[0052] According to the weight ratio of 80:10:10, 8g KFe[Fe(CN) 6 ].10H 2 O compound, 1g of acetylene black and 1g of PVDF are mixed evenly, NMP is added to the mixed powder for grinding and slurrying, the slurry is coated on carbon fiber cloth, and dried at a constant temperature of 110°C in a vacuum box for 8 hours, and a composite film is obtained after cooling electrode; this composite membrane electrode is placed in the brine chamber and potassium salt chamber in the electrochemical cell respectively as cathode and anode; 200mL of KCl solution with a concentration of 10g / L is added to the potassium salt chamber as supporting electrolyte; 2000mL The seawater is injected into the brine chamber, and the composition and content of the seawater are shown in the following table:

[0053]

[0054] Apply a voltage of 2V to both ends of the electrodes, and maintain at 80°C and pH=2 for 10 hours, then exchange the cathode and anode, empty the potassium-embedded solution in the ...

Embodiment 3

[0056] Prepare electrodes as in Example 2 to build an electrochemical cell; add 200mL of KCl solution with a concentration of 10g / L into the potassium salt chamber as a supporting electrolyte, and seawater flows through the brine chamber at a flow rate of 10mL / min; 0°C, pH=8 After applying a constant voltage of -2V to both ends of the lower electrode for 10 hours, exchange the cathode and anode to continue the above operation; after 20 cycles, the K in the potassium salt chamber + The concentration increased to 19.22g / L, Na + The concentration is 2.68g / L, Mg 2+ The concentration is 0.72g / L, Ca 2+ The concentration is 0.08g / L.

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Abstract

The invention provides a method for extracting potassium from seawater or brine. The method for extracting the potassium from the seawater or the brine comprises the steps that a cathode chamber of aelectrochemical cell is filled with the seawater or the brine, and an anode chamber is filled with a supporting electrolyte solution; a conductive substrate coated with a reducible Prussian-blue compound is used as a cathode, and a conductive substrate coated with an oxidable Prussian-blue compound is used as an anode; under the drive of an electric field or electric current, K<+> in the brine inthe cathode chamber is embedded into the reducible Prussian-blue compound, and meanwhile, after the oxidable Prussian-blue compound in the anode chamber releases K<+> or other cations to a potassium-rich solution, the oxidable Prussian-blue compound reverts to the reducible Prussian-blue compound; separation of the K<+> from other cations in the seawater or the brine is realized; fixation of the positions of the cathode and the anode are maintained, functions of the cathode and anode chambers are switched, and electrochemical operation is continued; and or the functions of the cathode and anode chambers are kept unchanged, a potassium-embedded solution in the cathode chamber is retained, or the potassium-embedded solution is discharged and then the seawater or the brine is added, the positions of the cathode and the anode are exchanged, and the electrochemical operation is continued. The method for extracting the potassium from the seawater or the brine has short process, simple operation, low energy consumption, low production cost, environmental protection and continuous operation, and is easy for industrialized application.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for extracting potassium from seawater or brine, in particular to a method for directly treating seawater or brine to make K + A method of separation and enrichment from other cations. Background technique [0002] Potassium is one of the indispensable and important elements in animal and plant tissues, and it is widely distributed in land and sea mainly in the form of salt in nature. Among them, there are about 17 billion tons on land, which are mainly stored in ore and salt lake brine, while 550 trillion tons are stored in the ocean, but the concentration is extremely low. Limited by mining technology and low-cost requirements, the currently available potassium resources mainly come from the mining and refining of terrestrial soluble potash deposits and salt lake brine. The distribution of terrestrial potassium resources is extremely uneven, with Canada, Russi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/14
CPCC25B1/14
Inventor 刘晓敏陈江南丛健伟石明成郝峻尉杨晖
Owner NANJING UNIV OF TECH