Method for preparing building materials by integrated absorption-mineralization of CO2 in exhaust gas

Abstract

The application discloses a method for preparing building materials by integrating CO2 absorption and mineralization in waste gas, wherein in the absorption tower, the amine method is used for CO2 capture by taking waste gas as the CO2 source to form CO2-rich liquid, and the ultra-low concentration CO2 can be quickly captured. In the desorption tower, high calcium and magnesium minerals and solid waste are used as raw materials, the CO2-rich liquid is used for curing, and high-value carbon-negative building materials are prepared, and the low-cost and efficient desorption and regeneration of the CO2 absorbent are realized. The CO2-lean liquid in the desorption tower is recycled to the absorption tower for CO2 capture, so that the raw material cost of the absorbent and the pollution to the environment are greatly reduced. The method can block harmful gases (such as CO and CH4) from entering the carbonization curing chamber, effectively solves the problem of poor applicability of multi-source waste gas due to different compositions, greatly expands the types of waste gas for technical application, effectively alleviates the problem of difficulty in regulating the macroscopic and microscopic performance of the carbonization curing product caused by different CO2 concentrations of the waste gas, different CO2 flow rates and mineralization rates, and ensures the stable production of the carbon-negative building materials.

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