(US4750436-A)      Contaminated soils near coke ovens are treated by drying the soil in a mill through which hot gases are passed to comminute the soil to a particle size less than 10mm. A substantial part of the contaminants are gasified. After drying the soil and the gases are heated in a denominated conduit provided with a burner at a temp. of 800 to 1200 deg. C. A cyclone separator stage separates the gas from the soil.    ADVANTAGE -   Complete denomination of contaminants.    (6pp)    (DE3623939-C)      The combustion and decontamination system for materials at a coke oven uses equipment for supplying broken up material to a mill where granules of less than 10mm in size are heated so that a substantial part is converted into the gas phase. The remaining solids are passed to a cyclone separator to enter a tube forming a decontamination path to further cyclones. Solid material also passes through an oil fired burner which supplied the hot gases to the mill, combustion temp. being between 800 and 1200 deg.C. The remaining purified solids are cooled, and the cooling air is returned to the burner as preheated prim. combustion air. Gases from the first cyclone are returned to the burner. The second cyclone is followed by three further cyclones forming a cooling system with a return line supplying the preheated air to the burner.    ADVANTAGE -   Solid materials are broken down without using a rotary tube furnace.    (6pp)    (EP253079-B)      Method for reclaiming contaminated soils and similar material, especially the sites of coking plants, by excavation, decontamination and re-filling of the excavation site with purified soil, wherein the excavated material, optionally after pre-treatment, is dried and then heat-treated at a high temperature, characterised in that drying in a mill (5) through which hot gases flow is combined with reduction of the material to a grain size range of from 0 to 10 mm in such a way that a considerable proportion of the noxious substances is converted into the gas phase, that after drying, the material together with the gas phase, in the form of a solids/gas dispersion, is treated at a temperature in the region of 800-1200 deg C in a heating and a decontamination section (9) equipped with a burner, and then a cyclone separator stage (11) is separated from the gas phase which contains all the noxious substances and which is led in the circuit with the burner (10) for complete decomposition of the noxious substances, a part stream of the combustion gases being fed to the combined drying and reduction stage (mill 5), and that the purified solid material is discharged after cooling, the cooling air from which is fed to the burner (10) as pre-heated primary air.    (8pp)