CO2 mineralizing power generation method using sodium bicarbonate as alkaline leaching agent

A sodium bicarbonate and alkaline technology, applied in the field of electrochemistry, can solve the problem that the mineralization battery power generation technology cannot be applied to low-alkaline industrial solid waste raw materials, etc., and achieve the effect of improving power generation performance and accelerating the reaction rate

Active Publication Date: 2017-12-05
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For existing CO 2 Mineralized battery power generation technology cannot be applied to the problem of low alkaline industrial solid waste raw materials. The purpose of this invention is to provide a new CO 2 Mineralized power generation method, using sodium bicarbonate as an alkaline leaching agent to fully extract the alkalinity in relatively low alkaline solid waste such as steel slag, broaden the CO 2 Application fields of mineralized power generation technology, and further improve CO 2 Power generation performance and open circuit voltage of mineralized batteries

Method used

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  • CO2 mineralizing power generation method using sodium bicarbonate as alkaline leaching agent
  • CO2 mineralizing power generation method using sodium bicarbonate as alkaline leaching agent
  • CO2 mineralizing power generation method using sodium bicarbonate as alkaline leaching agent

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Embodiment 1

[0042] This embodiment uses NaHCO 3 CO as an alkaline leaching agent 2 Chemical reaction process reference of mineralization power generation method figure 1 . in as CO 2 In the shell container of the mineralization battery, the cation exchange membrane 2 that only allows cations to pass through and can prevent anions from passing through is divided into two regions, the anode region and the cathode region. At the same time, the hydrogen diffusion electrode 1 is used as an anode electrode, and the electrode 3 carrying Pt / C on carbon cloth is used as a cathode electrode. Prepare 100ml of 1mol / L NaCl and 1mol / L NaHCO 3 Then gradually add 2g calcium carbide slag to the solution to form a suspension, and after stirring at a speed of 300rpm for 20min, the suspension is filtered, and the filtrate circulates between the storage tank and the anode area at a rate of 20ml / min , after drying the filter residue at 60°C, use XRD and thermogravimetric balance to analyze the composition...

Embodiment 2

[0047] This embodiment uses NaHCO 3 CO as an alkaline leaching agent 2 Chemical reaction process reference of mineralization power generation method figure 1 . in as CO 2 In the shell container of the mineralization battery, the cation exchange membrane 2 that only allows cations to pass through and can prevent anions from passing through is divided into two regions, the anode region and the cathode region. At the same time, the hydrogen diffusion electrode 1 is used as an anode electrode, and the electrode 3 carrying Pt / C on carbon cloth is used as a cathode electrode. Prepare 100mL of 1mol / L NaCl+1mol / L NaHCO 3 Then gradually add 5g calcium carbide slag to the solution to form a suspension, and after stirring at a speed of 200rpm for 50min, the suspension is filtered, and the filtrate circulates between the storage tank and the anode area at a rate of 20ml / min , after the filter residue was dried at 80°C, the composition change and salinity of the filter residue were an...

Embodiment 3

[0052] This embodiment uses NaHCO 3 CO as an alkaline leaching agent 2 For the chemical reaction process of mineralization power generation method see figure 1 . in as CO 2 In the shell container of the mineralization battery, the cation exchange membrane 2 that only allows cations to pass through and can prevent anions from passing through is divided into two regions, the anode region and the cathode region. At the same time, the hydrogen diffusion electrode 1 is used as an anode electrode, and the electrode 3 carrying Pt / C on carbon cloth is used as a cathode electrode. Use steel slag with a free CaO content of only 1.06% as raw material, add 200g steel slag to 100ml 0.2mol / L NaHCO 3 After the solution was stirred at 300rpm for 20min, the suspension was filtered, and the leached filtrate was circulated between the storage tank and the anode area at a rate of 20ml / min for the test of power generation performance and continuous power generation. Add 80ml of sodium bicarbo...

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Abstract

The invention discloses a CO2 mineralizing power generation method using sodium bicarbonate as an alkaline leaching agent, a battery is divided into a positive electrode zone and a negative electrode zone by a cation exchange membrane, the negative electrode zone contains a supporting electrolyte, the positive electrode zone contains a leaching solution formed by alkaline solid waste and the sodium bicarbonate, after a conductive path is formed by a positive electrode and a negative electrode, CO2 is introduced into the negative electrode for ionization into H<+> and HCO3<->, the H<+> is reduced into H2, the H2 is recycled back to the positive electrode, and oxidized into the H<+>, the H<+> and OH<-> of a positive electrode liquid are neutralized, and the sodium bicarbonate is generated from the HCO3<-> and Na<+> from the positive electrode zone. The sodium bicarbonate in a negative electrode liquid is continuously generated and circulated to the positive electrode zone, caustic soda is extracted, suspension is filtered and leached, filtrate is used as a positive electrode electrolyte, and the positive electrode liquid with the OH<-> consumed is recycled to the negative electrode zone. By means of heating, the CO2 mineralizing power generation method can improve the electricity production performance, is suitable for power generation of weak alkaline solid waste, can be applied to steel making industry to achieve three purposes of emission reduction, solid waste treatment and power generation, and has high practical value.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and specifically relates to a method of using sodium bicarbonate as an alkaline leaching agent to promote the hydrolysis of low-alkalinity industrial solid alkali and convert it into high-concentration lye, thereby enhancing CO 2 A method of mineralizing battery power generation performance. Background technique [0002] Atmospheric CO 2 The increase in concentration is the main cause of the greenhouse effect, how to reduce CO emissions 2 , cooling the earth has become a global scientific problem. Currently, the CO 2 Storage as waste is a CO 2 Emission reduction pathways, such as geological storage and ocean storage. And the CO 2 Regeneration of fuel as a chemical feedstock or conversion into industrial chemicals is another option. However, existing CO 2 Emission reduction methods still face the technical problems of high cost and high energy consumption, and reducing CO 2 Reducing emissi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/22H01M8/0612C25B5/00
CPCC25B5/00H01M8/0631H01M8/22Y02E60/50
Inventor 谢和平王昱飞刘涛
Owner SICHUAN UNIV
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