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A device and method for electrochemically preparing magnesium hydroxide for co-production of magnesium carbonate

An electrochemical and magnesium carbonate technology, applied in the field of electrochemistry, can solve the problems of inability to achieve net emission reduction, high power consumption, and high comprehensive energy consumption of membrane electrolysis systems

Active Publication Date: 2021-04-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

One of the main problems of this membrane electrolysis method is that the required electrode material cathode and anode must use noble metal electrodes, such as platinum electrodes or noble metal modified electrodes, otherwise the overpotential of the cathode and or anode is very high, resulting in high power consumption; The second problem is that the use of hydrogen as the sacrificial reagent in the anode area not only complicates the structure of the device, but also has a greater safety risk; the third problem is that the use of hydrogen as the sacrificial reagent in the anode area, such as adding the energy of hydrogen, the The overall energy consumption of the membrane electrolysis system is very high, and it is impossible to achieve CO 2 net emission reduction of

Method used

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  • A device and method for electrochemically preparing magnesium hydroxide for co-production of magnesium carbonate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Inject 0.5mol.L into the anode chamber -1 MgSO 4 The aqueous solution is used as the anolyte, and the cathode chamber is injected with 0.5mol.L -1 (NH 4 ) 2 S aqueous solution is used as the catholyte, and oxygen gas (99%) is passed into the oxygen gas diffusion electrode, and the power is turned on to start electrolysis; the electrolysis process conditions are: the temperature is 40°C, and the oxygen flow rate is 20mL.cm -2 .min -1 , the control current density is 80mA.cm -2 , The pH value of the cathode chamber is 10-11.

[0022] (2) Every 120 minutes, the suspension in the cathode chamber is drawn out, and after filtration, the filtrate and Mg(OH) 2 ; Add MgSO to the filtrate 4 Adjust its concentration to ~0.5mol.L -1 Then return to the cathodic chamber of the electrolytic cell; pump out 10% of the total volume of the electrolyte in the anode chamber, and add an equal volume of 0.5mol.L -1 (NH 4 ) 2 The aqueous solution of S returns to the anode chambe...

Embodiment 2

[0026] (1) Inject 1.0mol.L into the anode chamber -1 MgSO 4 The aqueous solution is used as the anolyte, and the cathode chamber is injected with 1.0mol.L -1 (NH 4 ) 2 S aqueous solution is used as the catholyte, and air (containing oxygen ~ 21%) is passed into the oxygen gas diffusion electrode, and the electrolysis is started after the power is turned on; the electrolysis process conditions are: the temperature is 30°C, and the air flow rate is 40mL.cm -2 .min -1 , the control current density is 40mA cm -2 , The pH value of the cathode chamber is 9-10.

[0027] (2) Every 120 minutes, the suspension in the cathode chamber is drawn out, and after filtration, the filtrate and Mg(OH) 2 ; Add MgSO to the filtrate 4 Adjust its concentration to ~1.0mol.L -1 Then return to the cathode chamber of the electrolytic cell; pump out the electrolyte solution in the anode chamber to open the circuit to 15% of its total volume, and add an equal volume of 1.0mol.L -1 (NH 4 ) 2 The ...

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Abstract

The invention relates to a method for electrochemical mineralization of CO 2 Process for the preparation of magnesium carbonate by electrochemical mineralization of CO 2 Apparatus for the preparation of magnesium carbonate. The device uses O 2 The diffusion electrode is the cathode, and the titanium-based PbTe@PbS / TNAs electrode is the anode, 0.5~1.0mol.L ‑1 Magnesium sulfate and 0.5~1.0mol.L ‑1 The ammonium sulfide aqueous solution is the electrolyte of the cathode chamber and the anode chamber respectively. The anode chamber and the cathode chamber are separated by Nafion cation exchange membrane. ‑ 2 .min ‑1 , the oxygen concentration is 21-99%, the pH value of the cathode chamber is 9-12, and the cathode current density is 20-100mA.cm ‑2 .

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, in particular to an electrochemical preparation of magnesium hydroxide mineralized CO 2 A device and method for co-producing magnesium carbonate. Background technique [0002] CO emissions from fossil fuel combustion 2 It is widely considered to be the main cause of global warming and poses a serious threat to the human living environment. CO 2 Emission reduction has become the focus of global attention. CO 2 The capture and storage of natural gas is one of the main emission reduction methods at present, mainly including geological storage, ocean storage, mineralization storage, etc. [0003] Geological storage is generally a supercritical state (a mixture of gas and liquid) CO 2 Injection into geological formations such as oil fields, gas fields, saline aquifers, unworkable coal mines, etc. According to IPCC research, CO 2 It is stable in nature and can be sealed for a long time....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/20C25B9/19C01F5/24
CPCC25B1/20C01F5/24C25B9/19Y02P20/129Y02P20/10
Inventor 刘中清杨朋李春
Owner SICHUAN UNIV