US 12,421,171 B2
Method of preparing high-performance green building material based on combustion flue gas carbon dioxide mineralization
Min Song, Nanjing (CN); Yue Hu, Nanjing (CN); Jiahao Lai, Nanjing (CN); and Lei Yu, Nanjing (CN)
Assigned to SOUTHEAST UNIVERSITY, Nanjing (CN)
Appl. No. 18/871,815
Filed by SOUTHEAST UNIVERSITY, Nanjing (CN)
PCT Filed Nov. 30, 2023, PCT No. PCT/CN2023/135305
§ 371(c)(1), (2) Date Dec. 5, 2024,
PCT Pub. No. WO2024/174650, PCT Pub. Date Aug. 29, 2024.
Claims priority of application No. 202310152197.X (CN), filed on Feb. 23, 2023.
Prior Publication US 2025/0171371 A1, May 29, 2025
Int. Cl. C04B 40/02 (2006.01); C04B 28/00 (2006.01); C04B 111/00 (2006.01)
CPC C04B 40/0231 (2013.01) [C04B 28/00 (2013.01); C04B 2111/00017 (2013.01); C04B 2111/00224 (2013.01); C04B 2201/20 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method of preparing a high-performance green building material based on combustion flue gas carbon dioxide mineralization, comprising:
calculating a raw material ratio: screening industrial solid waste materials and calculating a ratio of the industrial solid waste materials, comprising: based on an association relationship diagram of CaO, SiO2 and Al2O3 components contained in the industrial solid waste materials with CO2 reactivity, preliminarily selecting a ratio interval of the components with CO2 high reactivity, setting a plurality of component ratios in the ratio interval, calculating a corresponding CO2 upper limit required for theoretical mineralization, and selecting an optimal component ratio;
pre-treatment: based on the optimal component ratio, taking each industrial solid waste material, grinding, screening, and drying to obtain a solid waste powder, wherein the industrial solid waste materials comprise at least two of a fly ash, a coal gangue, a steel slag, and an iron tailing;
granulation: pouring the solid waste powder, dihydrate gypsum, and a gel material into a granulator, mixing uniformly at a first rotation speed, and then taking a part of a mixture, and then at a second rotation speed, stirring a remaining mixture with a proper amount of deionized water sprayed until spherical kernels are formed, and then uniformly adding the part of the mixture and finally screening out balls with a diameter of 5 to 16 mm as an aggregate, wherein the first rotation speed is lower than the second rotation speed; a ratio of the solid waste powder to the gel material is (4.5 to 30): 6; the gel material is a cement;
pre-curing: placing the aggregate in a drying oven with a constant temperature and humidity to perform a first hydration reaction;
drying: placing the hydrated aggregate into a baking oven to dry and remove water in pores and then taking samples from the baking oven and cooling down to room temperature to prepare moulded ceramic granules and then storing in a sealing way;
carbon dioxide mineralization curing: placing the moulded ceramic granules into a reaction kettle, introducing a combustion flue gas containing CO2 for a mineralization reaction under a given condition of temperature, humidity, and pressure, taking out reacted ceramic granules and putting into the drying oven for drying to prepare a cold-bonded lightweight aggregate;
assisted hardening curing: supplementing water to the cold-bonded lightweight aggregate to perform a second hydration reaction and obtain a finished product, wherein the grinding, screening, and drying comprise: grinding and screening to below 60 meshes, and putting into a 65° C. baking oven to dry for 6 h and then taking out and cooling down naturally and wherein in a granulation process, the first rotation speed is 15 rpm to 20 rpm and the second rotation speed is 80 rpm to 90 rpm.