| 摘要 |
<p>PCT No. PCT/DE84/00183 Sec. 371 Date May 7, 1985 Sec. 102(e) Date May 7, 1985 PCT Filed Sep. 6, 1984 PCT Pub. No. WO85/01069 PCT Pub. Date Mar. 14, 1985.A process for treating oil-contaminated debris or like material in particular material to be washed such as mill scale, which is produced in industrial processes, as well as a plant and an apparatus for carrying out the process, are to be improved in such a way as to permit oil to be removed from the industrial material to be washed, in particular mill scale. For that purpose it is proposed that the oil-contaminated material, in particular the mill scale, be introduced into a washing drum and there washed in counter-flow mode in a washing lye with a pH-value of from 12 to 14, preferably 10 to 14, with the material to be washed being lifted at the wall of the drum by means of support surfaces. The washing lye is preferably mixed with about 2% of caustic soda and/or washing is at about 50 DEG C. or a higher temperature. The plant is characterized by at least one washing drum (1a, 1b) which is supplied with washing lye (L) and which has connected downstream thereof a dewatering means (25, 26) and, downstream thereof again, a means (1c) for liquid exchange with water. For that purpose, provided at the inside surface of a closed drum wall (2) of a washing drum (1) is at least one blade (11) which is inclined with respect to the wall of the drum and which extends on a helical line (G).</p> |
