US 4,917,587 AGranted

Apparatus for the production of building units from afterhardening materials

AssigneeFakombinat

InventorsTibor Alpar, Janos Gyorvari, Erno Schmidt

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Abstract

The invention relates to an apparatus for the production of building units from an afterhardening mixture containing cement and/or lime as binding material. The raw mixture is continuously fed and pressed by stamping into a die with CO.sub.2 gas at a pressure higher than atmospheric being passed through the raw mixture in the die space. Through an instantaneous reaction of carbonation, the material is hardened to a formed body. The CO.sub.2 gas is prevented from escaping by a gastight seal in the vicinity of the inlet port of the die. Further towards the outlet port, the pressure of the CO.sub.2 gas is decreased. In the vicinity of the outlet port only as much CO.sub.2 gas is fed as is necessary for the completing of the chemical reaction. Thus, any loss of gas will be minimized. The continuously discharged body is cut to size by using a saw.

Claims10

Dependent claims

Apparatus for the production of building units from an afterhardening mixture containing cement and water as binding material wherein said binding material is hardened by carbonation, said apparatus comprising a die comprising a die space, a CO.sub.2 gas-source being capable of fluid communication with said die space, and holes in at least one wall of the die, said holes being suitable for injection of CO.sub.2 gas into the die space at pressure which exceeds the atmospheric pressure, the die having an inlet port for admitting the raw afterhardening mixture, and an outlet port for discharging the building units hardened by carbonation;

a press mechanism being situated in front of the inlet port for pressing the raw afterhardening mixture into the die space and moving the afterhardening mixture as well as the building units hardened therefrom by carbonation through the die space;
and the holes leading into the die space serving as inlets for the CO.sub.2 gas, said holes being divided into separate zones of hole groups and communicating with gas injection devices which include control means for separately controlling the amount of CO.sub.2 gas to be injected at each of said zones.

Dependencies are inferred from the claim text.