C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 20/08 (2006.01) C04B 7/24 (2006.01) A62D 3/00 (2006.01)
Patent
CA 2152219
The invention refers to a process of treatment and environment-friendlyutilization of asbestos-cement products including a thermal process to transform the asbestos component. Inventively, this is achieved by a coarse reduction of the asbestos- cement products under black side conditions with maintained vacuum. Then the material is ground to asbestos-cement meal and fed to the flame zone of the rotary kiln of a cement clinker production line. Depending on the fuel type used, the portion of fed asbestos-cement meal varies between 2 and 5 %, related to the amount of cement raw meal, substituting 2 to 5 % of the cement raw meal mix at a time. The thermal transformation of the asbestos component takes place with temperatures of approx. 1800 °C in the burner zone. The modified residualsubstance becomes a constituent of the cement clinker due to assimilation in the kiln charge.
Ambrosius Stefan
Buhrandt Wolf-Joachim
Gleichmar Gert
Gormar Helmut
Kieser Joachim
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Institut Fur Baustoff- Und Umweltschutz-Technologie Ibu-Tec
Kraemer Klaus
Tuv Thuringen Gmbh
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