Process for the production of building units from afterharding materials
First Claim
1. Process for the production of building units from an afterhardening mixture containing cement, additives and water as binding material, the process including the steps of admitting the afterhardening mixture into a die which has an inlet port for insertion of the afterhardening mixture and an outlet port for removal of the afterhardening mixture in compacted form, injecting CO2 gas into the afterhardening mixture and bringing about a carbonation reaction with the afterhardening mixture, pressing the afterhardening mixture continuously in the die while injecting the CO2 gas into the afterhardening mixture under pressure, controlling the injecting of the CO2 gas so as to provide a greater amount of the gas flowing through the afterhardening mixture near the inlet port of the die as compared to the amount of the gas flowing through the afterhardening mixture near the outlet port, mechanically compacting the afterhardening mixture at the inlet port and faces of the die, and thereby forming a generally gastight seal between the afterhardening material and the die, controlling the injecting of the CO2 gas into the die so that full completion or essentially full completion of the carbonation reaction occurs, and removing the afterhardening mixture in compacted form from the die and separating the afterhardening mixture in compacted form into the building units.
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Abstract
A process for the production of building units from an afterhardening mixture containing cement and/or lime as binding material includes the following steps. The raw mixture is continuously fed and pressed by stamping into a die with CO2 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 CO2 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 CO2 gas is decreased. In the vicinity of the outlet port only as much CO2 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.
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Citations
8 Claims
- 1. Process for the production of building units from an afterhardening mixture containing cement, additives and water as binding material, the process including the steps of admitting the afterhardening mixture into a die which has an inlet port for insertion of the afterhardening mixture and an outlet port for removal of the afterhardening mixture in compacted form, injecting CO2 gas into the afterhardening mixture and bringing about a carbonation reaction with the afterhardening mixture, pressing the afterhardening mixture continuously in the die while injecting the CO2 gas into the afterhardening mixture under pressure, controlling the injecting of the CO2 gas so as to provide a greater amount of the gas flowing through the afterhardening mixture near the inlet port of the die as compared to the amount of the gas flowing through the afterhardening mixture near the outlet port, mechanically compacting the afterhardening mixture at the inlet port and faces of the die, and thereby forming a generally gastight seal between the afterhardening material and the die, controlling the injecting of the CO2 gas into the die so that full completion or essentially full completion of the carbonation reaction occurs, and removing the afterhardening mixture in compacted form from the die and separating the afterhardening mixture in compacted form into the building units.
Specification