Method for integrally preparing building material by absorbing and mineralizing CO2 in waste gas

The invention discloses a method for integrally preparing a building material by absorbing and mineralizing CO2 in waste gas, which is characterized in that in an absorption tower, the waste gas is used as a CO2 source, and CO2 is captured by an amine absorption method to form a CO2-rich solution, so that the rapid capture of ultralow-concentration CO2 can be realized. In the desorption tower, high-calcium magnesium minerals and solid wastes are used as raw materials, and low-cost and efficient desorption and regeneration of the CO2 absorbent are realized while the high-value negative carbon building material is prepared through compression molding and maintenance in CO2 rich liquor. And the CO2 barren solution in the desorption tower is recycled into the absorption tower for CO2 capture, so that the raw material cost of the absorbent and the pollution of the absorbent to the environment are greatly reduced. According to the method, harmful gases (such as CO, CH4 and the like) can be prevented from entering t