| 摘要 |
In a method for pretreating charges contaminated with carbon carriers, su ch as for example quantities of earth, soil, rock or minerals contaminated w ith carbon carriers and of low calorific value for use in clinker kilns, the said charges are introduced into a reactor (8) and heated or dried with gas es. The heated gases are drawn off at temperatures below 1250°C, preferably 700-900°C, and the heated or dried charge is separately discharged at temper atures between 500°C and 1000°C, wherein the temperatures are set and mainta ined by regulating the fresh air supply, a water or water vapour supply, by regulating the feed rate of the charge and/or of process gases, such as for example tertiary air, and if required by burning fuels to stabilize the temp erature distribution in the reactor (8). The gases drawn off from the reacto r 8) are at least partially recirculated to the reactor (8) and/or fed to a precalcining stage and/or a preheating stage of the clinker kiln (1).</SDOAB >
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