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Method for coproducing sulfuric acid by utilizing gypsum mineralized CO2

A technology of gypsum and sulfuric acid, applied in the direction of electrolysis process, electrolysis components, etc., can solve the problems of high energy consumption and long process flow, and achieve the effect of solving environmental pollution problems, rich sources of raw materials, and low energy consumption

Inactive Publication Date: 2013-01-30
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] For the deficiencies in the prior art, the purpose of the present invention is to provide a new CO 2 Utilization method - using gypsum to mineralize CO 2 Co-production of sulfuric acid to solve existing technology CO 2 The mineralization method has problems such as long process flow and high energy consumption, so as to eliminate the pollution of CO2 and waste gypsum, and recover valuable sulfur resources

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  • Method for coproducing sulfuric acid by utilizing gypsum mineralized CO2
  • Method for coproducing sulfuric acid by utilizing gypsum mineralized CO2

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Embodiment 1

[0024] The mineralization process of this embodiment is as attached figure 1 Shown. The electrolytic cell is divided into positive and negative regions by an anion exchange membrane 2 that allows only anions to pass through but can prevent cations from passing through. Add 0.2mol / L of H 2 SO 4 The solution is put into the positive electrode electrolyzer as the positive electrode electrolyte, adding 1.2mol / L Na 2 SO 4 The solution is transferred to the negative electrode electrolyzer as the negative electrode electrolyte. A gas diffusion electrode 1 is used as the positive electrode, and a platinum electrode 3 is used as the negative electrode. Weigh 3g of dry gypsum and add it to the negative electrode electrolyte, bubbling the CO at the bottom of the negative electrode electrolyzer 2 The flow rate is 20 ml / min, the hydrogen generated by the negative electrode is collected and enters the buffer tank 4, the hydrogen from the buffer tank is passed into the gas diffusion electrode...

Embodiment 2

[0026] The mineralization process of this embodiment is as attached figure 1 Shown. The electrolytic cell is divided into positive and negative regions by an anion exchange membrane 2 that allows only anions to pass through but can prevent cations from passing through. Add 0.1mol / L of H 2 SO 4 The solution is put into the positive electrode electrolyzer as the positive electrode electrolyte, adding 1.5mol / L Na 2 SO 4 The solution is transferred to the negative electrode electrolyzer as the negative electrode electrolyte. A gas diffusion electrode 1 is used as the positive electrode, and a platinum electrode 3 is used as the negative electrode. Weigh 5g of dry phosphogypsum solid waste and add it to the negative electrode electrolyte, and bubble the CO at the bottom of the negative electrode electrolyzer 2 The flow rate is 20 ml / min, the hydrogen generated by the negative electrode is collected and enters the buffer tank 4, the hydrogen from the buffer tank is passed into the ga...

Embodiment 3

[0028] The mineralization process of this embodiment is as attached figure 2 Shown. The electrolytic cell is divided into positive and negative regions by an anion exchange membrane 2 that allows only anions to pass through but can prevent cations from passing through. Add 0.1 mol / L of H 2 SO 4 The solution is put into the positive electrode electrolyzer as the positive electrode electrolyte, adding 1 mol / L Na 2 SO 4 The solution is transferred to the negative electrode electrolyzer as the negative electrode electrolyte. The positive electrode adopts the metal platinum electrode 5, and the negative electrode adopts the metal nickel electrode 3. Weigh 3g of dry gypsum and add it to the negative electrode electrolyte, bubbling the CO at the bottom of the negative electrode electrolyzer 2 The flow rate is 20 ml / min, and the electrolysis reaction is carried out at a voltage of 2.6 V for 1 h. Dry the solid electrolysis product of the negative electrode electrolyzer to obtain CO 2...

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Abstract

The invention discloses a method for coproducing sulfuric acid by utilizing gypsum mineralized CO2, which comprises the following steps: placing an anion-exchange membrane into an electrolytic cell; dividing the electrolytic cell into an anode area and a cathode area; adding a sodium sulfate solution as a cathode electrolyte into the cathode area; adding a sulfuric acid solution as an anode electrolyte into the anode area; adding the crushed gypsum into the cathode electrolyte of the electrolytic cell while introducing into the carbon dioxide gas; applying a direct current power supply between an anode electrode and a cathode electrode; reducing the hydrogen ion in the cathode electrolyte into hydrogen by the cathode electrode; converting the carbon dioxide in the solution into carbonate; performing replacement reaction on the carbonate and the gypsum, converting the gypsum into calcium carbonate while replacing freely flowing sulfate radical; and causing the sulfate radical to pass through the anion-exchange membrane under the action of current and to combine with the hydrogen ion generated by the anode electrode, thereby generating the sulfuric acid. The method has the advantages of high product extra value, simple technical process, mild reaction condition, and the like.

Description

Technical field [0001] The present invention relates to a CO 2 Mineralization emission reduction method, especially involving the use of gypsum to mineralize CO 2 CO that produces sulfuric acid 2 Methods of emission reduction. Background technique [0002] Climate warming is an unquestionable fact. More than 90% of the possibilities are caused by human activities. CO in the global atmosphere 2 The mass concentration has changed from 280×10 before the industrial age -6 Increased to 379×10 in 2005 -6 . Due to the gradual increase in greenhouse gas emissions from human activities, it is estimated that by 2100, CO in the atmosphere 2 The mass concentration will reach 570×10 -6 , Causing the global temperature to rise by 1.9℃ and the sea level to rise by 38 cm. 6 billion tons of CO must be reduced annually globally 2 Emissions can truly prevent global warming. The "greenhouse effect" of the atmosphere and global warming will be the biggest living environment problem facing mankind i...

Claims

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Application Information

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IPC IPC(8): C25B1/22
Inventor 谢和平王昱飞刘涛江文
Owner SICHUAN UNIV