| 摘要 |
The invention relates to a process for making calcium carbide 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 hydrate (Ca(OH)2) or precrushed limestone (CaCO3) to be used as a starting material for quicklime. The precrushed materials are mixed and the resulting mixture is introduced into a drying zone and freed therein at 80 DEG to 120 DEG 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 decarbonized, at temperatures of 900 DEG to 1400 DEG C. The thermally-pretreated mixture of starting materials with an inherent temperature of 900 DEG to 1000 DEG C. is then directly introduced into the oxygen-thermal furnace and reacted with oxygen to calcium carbide. |
