	US 11,753,340 B2
	Process and device for carbonating concrete waste and/or sequestering CO₂
Jan Skocek, Leimen (DE); Maciej Zajac, Heidelberg (DE); Mohsen Ben Haha, Heidelberg (DE); Stefan Federhen, Hirschberg (DE); and Marek Majchrowicz, Olszowa (PL)
Assigned to HConnect 2 GmbH, Heidelberg (DE)
Appl. No. 17/602,453
Filed by HConnect 2 GmbH, Heidelberg (DE)
PCT Filed May 25, 2020, PCT No. PCT/EP2020/064427 § 371(c)(1), (2) Date Oct. 8, 2021, PCT Pub. No. WO2020/239683, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 19177076 (EP), filed on May 28, 2019.
Prior Publication US 2022/0212992 A1, Jul. 7, 2022
Int. Cl. C04B 20/02 (2006.01); C04B 18/167 (2023.01); C04B 40/02 (2006.01); C04B 111/00 (2006.01)

CPC C04B 20/023 (2013.01) [C04B 18/167 (2013.01); C04B 20/026 (2013.01); C04B 40/0231 (2013.01); C04B 2111/00017 (2013.01)]

23 Claims

1. A method for manufacturing supplementary cementitious material and sequestering CO₂by carbonating concrete fines comprising the steps:

grinding the concrete fines obtained from crushed concrete demolition waste in a mill at a temperature from 1 to 10° C. above the water dew point in a carbonating atmosphere provided by a gas containing from 10 to 99 Vol.-% CO₂,

circulating the ground and partially carbonated concrete fines in a fluidized bed reactor in contact with the carbonating atmosphere, and

withdrawing decarbonated gas and carbonated concrete fines with recirculation of some of the gas and concrete fines to the reactor and/or mill, wherein at least 80 wt.-% of the concrete fines are carbonated.