Carbon dioxide recovery apparatus and carbon dioxide recovery method

A carbon dioxide recovery method, comprising:

• electrolyzing;
• reacting;
• and
• supplying chlorine gas, wherein
• the electrolyzing is performed using an electrolysis vessel,
• the electrolysis vessel comprises a diaphragm, an anode, and a cathode,
• an anode electrolysis chamber and a cathode electrolysis chamber are provided in the electrolysis vessel by the diaphragm,
• the anode is disposed in the anode electrolysis chamber,
• the cathode is disposed in the cathode electrolysis chamber,
• the electrolyzing includes supplying an aqueous metal salt solution to both the anode electrolysis chamber and the cathode electrolysis chamber, and generating an aqueous metal hydroxide salt solution by electrolysis in the cathode electrolysis chamber,
• the reacting is performed using a reaction vessel,
• the reacting includes transferring the aqueous metal hydroxide salt solution is to the reaction vessel, supplying carbon dioxide-containing gas to the aqueous metal hydroxide salt solution in the reaction vessel, and reacting carbon dioxide in the carbon dioxide-containing gas with a metal salt in the aqueous metal hydroxide salt solution to generate carbonate, and
• the supplying of the chlorine gas includes supplying the chlorine gas generated in the anode electrolysis chamber to the aqueous metal salt solution in the anode electrolysis chamber in the electrolysis vessel.