C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/56
C01B 31/32 (2006.01)
Patent
CA 1168832
PRODUCTION OF CALCIUM CARBIDE ABSTRACT OF THE DISCLOSURE The invention relates to a process for making calcium car- bide by reacting an excess of coke with quicklime in the presence of oxygen in an oxygen-thermal furnace. To this end, the invention provides for precrushed coal to be used as starting material for coke and precrushed lime hy- drate (Ca(OH)2) or precrushed limestone (CaC03) to be used as a starting material for quicklime. The precrushed mate- rials are mixed and the resulting mixture is introduced into a drying zone andand freed therein at 80 to 120°C from adhering water. Next, the warm mixture coming from the drying zone, and air, are introduced into a calcining apparatus in which the coal constituent is coked and the lime constituent is simultaneously dehydrated or decarbo- nized, at temperatures of 900 to 1400°C. The thermally- pretreated mixture of starting materials with an inherent temperature of 900 to 1000°C is then directly introduced into the oxygen-thermal furnace and reacted with oxygen to calcium carbide.
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Kersting Hans-Joachim
Portz Willi
Strauss Georg
Wolfrum Erhard
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
Rheinische Braunkohlenwerke Aktiengesellschaft
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