Cleaning and liquid contact with solids – Processes – Work handled in bulk or groups
Patent
1985-05-07
1991-01-29
Pal, Akok
Cleaning and liquid contact with solids
Processes
Work handled in bulk or groups
134 26, 134 29, 134 31, 134 40, 134 60, 134 63, 134 66, 2102421, 210923, C73G 114, B08B 308
Patent
active
049883917
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for treating oil-contaminated debris or like materials, in particular material to be washed which occurs in industrial processes such as mill scale, and a plant and/or apparatus therefor.
For the purposes of cooling large high-speed rolling mills, the rolls thereof are flooded with emulsified lubricating and cooling agents. The oil passes into the mill scale which is produced during the rolling operation and which, being charged with up to about 20% of oil, can no longer be used.
Due to the incomplete combustion of the oil, cloth filters clog and electrical filters are short-circuited by the carbon bridges which are formed and that results in filter fires or explosions.
For the stated reasons, the oil must be removed from the mill scale before it is put to use, the state of the art providing the following methods for that purpose.
The oil-contaminated mill scale is mixed with non-oil-contaminated mill scale so that the total proportion of oil falls below the harmful level. As real thorough mixing of oil-bearing and non-oil-bearing scale can hardly be carried out on a technical level, those methods still involve nests of oil, and thus give rise to the disadvantages already referred to above.
The oil-bearing mill scale may also be introduced inter alia into a downstream coke battery Due to the presence of iron, the sulphuric acid which is formed is so aggressive that the pipe systems which come into contact therewith are quickly eaten away. That means that the manufacturers of coking installations refuse any guarantee in respect thereof when oil-contaminated mill scale is intended to be used.
Problems also arise in regard to cleaning metal chips or turnings, in particular of aluminium, which have become wetted with machine oil, oil-bearing coolant or the like, for example during a cutting machining process. It is known for metal chips or turnings to be washed in a liquid If for example aluminium chips or turnings are washed in a lye, H.sub.2 is produced by the reaction which occurs, with a large amount of foam being produced and an explosive mixture of hydrogen and oxygen being formed.
Having regard to the foregoing considerations, the inventor set himself the aim of so providing a process of the kind set forth in the opening part of this specification that it is possible to remove oil from industrial material to be washed, in particular mill scale. That process and the plant and/or apparatuses provided for carrying out the process are also to be such that they can be used for dealing with oil-contaminated aluminium chips or turnings or the like.
The foregoing object is achieved by way of the present invention by a process for treating oil-contaiminated debris comprising the steps of providing a drum rotatable about an axis, said drum being provided with a sidewall and opposed end walls, said opposed endwalls each having an inlet and said sidewall being provided with means for lifting the oil-contaminated debris being treated, rotating said drum about said drum axis, feeding said oil-contaminated debris through the inlet in one of said opposed endwalls, and feeding a lye washing solution having a pH of between 10 to 14 through the inlet in the other of said opposed endwalls such that said lye washing solution flows counter-current to the flow of said oil-contaminated debris and said debris is lifted by said means for lifting as said lye flows counter-current to said debris. Preferably for example the mill scale or corresponding material to be washed, being more or less of a slurry-like consistency, is introduced into a washing drum where it is washed at about 50.degree. C. and higher in a washing lye to which 2% caustic soda is added
The scope of the present invention includes a washing drum which is particularly suitable for carrying out that process and in which inclined blades are disposed at the inside surface of the closed wall of the drum, a plurality of such blades extending on a helical line, that is to say, forming a helix or spiral. According to the invent
REFERENCES:
patent: 1580723 (1923-06-01), Hapgood
patent: 2987426 (1961-04-01), Shaw
patent: 3163929 (1965-01-01), Goodstein
patent: 3522093 (1970-07-01), Woolman
patent: 3715324 (1973-06-01), Hynes
patent: 3746553 (1973-07-01), Anderson
patent: 4097306 (1978-06-01), Carman
Metals Handbook, 8th Edition, vol. 2, pp. 307-325 (1972).
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