Hconnect 2 Gmbh

Heidelbergcement Ag

Stefan Federhen

Mohsen Ben Haha

Maciej Zajac

Jan Skocek

Marek Majchrowicz

A method for manufacturing supplementary cementitious material and sequestering COby carbonating concrete fines has the following steps: grinding the concrete fines obtained from crushed concrete demolition waste in a mill at a temperature from 1 to 10&#xb0; C. above the water dew point in a carbonating atmosphere provided by a gas containing from 10 to 99 Vol.-% CO, 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.

Process and device for carbonating concrete waste and/or sequestering CO

A method of exhaust gas scrubbing includes providing recycled concrete fines as a waste material rich in carbonatable Ca and/or Mg phases and with d&#x2264;1000 &#x3bc;m and a Rosin-Rammler slope n from 0.6 to 1.4 , injecting the waste material into an exhaust gas stream containing COand/or SOfor reaction with COand/or SOat a relative humidity of 50 to 100 Vol.-% and a temperature from 40 to 130&#xb0; C. in an amount of dry waste material ranging from 5 to 30 kg/m, withdrawing a partly carbonated and/or sulphurized waste material and purified exhaust gas, and recycling a part of the partly carbonated and sulphurized waste material while the remainder is discharged, as well as use of a waste material slurry for exhaust gas cleaning of COand/or SO.

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Hirschberg, Germany

Stefan Federhen