▎ 摘　　要

NOVELTY - Recycling carbon dioxide and producing lithium carbonate from industrial kiln exhaust gas, involves passing industrial kiln exhaust gas through a cyclone to remove particulate matter, and then subjecting to denitration and desulfurization treatment to obtain the pretreated exhaust gas. The pretreated exhaust gas is pressurized to 0.1-0.7 MPa by the compressor, and then entered the water-gas separation tank for dehydration, and then used double-column temperature swing adsorption. The device is used to remove NOx and SO2(sulfur dioxide) to obtain purified exhaust gas. The double-tower temperature swing adsorption device includes two adsorption towers, and the two adsorption towers both contain adsorbents. The purified exhaust gas is passed into a four-column pressure swing adsorption device to separate carbon dioxide, and the four-column pressure swing adsorption device includes four pressure swing adsorption towers connected in sequence. USE - Method for recycling carbon dioxide and producing lithium carbonate from industrial kiln exhaust gas. ADVANTAGE - The method uses the temperature swing adsorption method to remove trace sulfides and nitrogen oxides in exhaust gas, so that the total concentration of SO2 and NOx in the exhaust gas is less than 1 ppm, also uses the pressure swing adsorption method to recover carbon dioxide. The obtained carbon dioxide gas has high purity, high recovery rate and large processing capacity. The separated and refined high-purity carbon dioxide is used as a raw material for the carbonization process to produce battery-grade lithium carbonate, which realizes the resource utilization of carbon dioxide in the exhaust gas of industrial kilns. DETAILED DESCRIPTION - Recycling carbon dioxide and producing lithium carbonate from industrial kiln exhaust gas, involves passing industrial kiln exhaust gas through a cyclone to remove particulate matter, and then subjecting to denitration and desulfurization treatment to obtain the pretreated exhaust gas. The pretreated exhaust gas is pressurized to 0.1-0.7 MPa by the compressor, and then entered the water-gas separation tank for dehydration, and then used double-column temperature swing adsorption. The device is used to remove NOxand SO2(sulfur dioxide) to obtain purified exhaust gas. The double-tower temperature swing adsorption device includes two adsorption towers, and the two adsorption towers both contain adsorbents. The purified exhaust gas is passed into a four-column pressure swing adsorption device to separate carbon dioxide, and the four-column pressure swing adsorption device includes four pressure swing adsorption towers connected in sequence. The 4 pressure swing adsorption towers are filled with adsorbents, which are used to absorb carbon dioxide in the flue gas purification exhaust gas, and the remaining components that are not easy to be adsorbed flow out from the top of the tower and are directly evacuated. The adsorbents in the four pressure swing adsorption towers are desorbed to obtain carbon dioxide gas. The carbon dioxide gas is poured into the lithium hydroxide solution, stirred and mixed uniformly, when a large amount of solid appears in the solution, stopped the introduction of carbon dioxide gas, raised temperature to 90-110℃ for 10-60 minutes, and centrifuged while hot to obtain crude lithium carbonate, which is purified to obtain lithium carbonate.