JPH07114986B2 - Centrifugal separation method of oil attached to metal scraps - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for reducing the viscosity of oil adhering to metal scraps and performing centrifugal separation.

The object of the present invention is to reduce the viscosity of the oil adhering to the metal scraps when separating and recovering the oil adhering to the metal scraps from the metal scraps in order to improve the separation and recovery efficiency. The point is that the oil easily separates.

[Conventional technology]

Abrasive oil adheres to metal chips such as stainless steel, brass, aluminum and other castings, and cutting oil adheres to metal metal chips. The oil adhering to this metal scrap is
To make it easier to (1) collect oil and (2) reuse metal scraps (for example, in the case of stainless steel polishing scraps, put them into an electric furnace for reuse, but a large amount of polishing oil adheres to them. It is separated for the purpose of causing trouble in the operation of the electric furnace). This separation work is carried out by placing metal scraps with oil on a centrifuge, but the polishing scraps are cotton-like and the viscosity of the polishing oil is high, so that sufficient separation cannot be achieved. The current situation.

[Problems to be solved by the invention] In view of the above-mentioned present situation, the present inventor reduces the viscosity of oil adhering to metal scraps to facilitate separation of metal scraps and oil,
As a result of various studies, the present invention has been completed as a result of increasing the oil recovery rate to improve the economic efficiency, and making it easy to reuse the metal scrap because the oil is less attached.

That is, the present invention is characterized in that the heating oil is brought into direct contact with the metal scraps to which the oil adheres, and the viscosity of the oil adhered to the metal scraps is reduced to perform centrifugal separation. This is a method of decreasing the viscosity.

〔Example〕

In the following, in the step of separating the polishing oil from the polishing scraps by putting the stainless polishing scraps having the polishing oil adhered by the polishing of the stainless steel plate into the centrifuge, the "centrifugation of the oil scraps attached to the metal scraps according to the present invention is performed. An example of applying the “method” will be described with reference to FIG.

FIG. 1 is a “method for centrifuging oil attached to metal scraps” according to the present invention.
FIG. 3 is a schematic explanatory view of an apparatus for separating the polishing oil from the stainless scraps to which the polishing oil adheres using.

1 is a centrifuge, and polishing debris is taken out from a polishing debris outlet 2 in the center of the lower part, and polishing oil is a polishing oil outflow port 3 on the lower side.
Taken out. Reference numeral 4 is a jetting pipe of the heated polishing oil A for jetting the heated polishing oil A toward the inside of the centrifuge, which can move up and down because it can appear and disappear in the centrifuge. A heating tank 5 for polishing oil is provided with a steam heater 6 as a heating means, and a heating tank 5 for polishing oil and a jetting pipe 4 for polishing oil are provided with a pump 7 and a solenoid valve 8 between them. Are connected by an oil feed pipe 10. 11 is an oil storage tank, and 12 and 13 are conveyors. The polishing oil outlet 3 of the centrifuge 1
Part of the polishing oil that comes out is distributed to the heating tank 5 for polishing oil and part of it to the oil storage tank 11.

First, stainless steel dust with abrasive oil attached is put into the centrifuge 1 by means of a belt conveyor 12 and, while rotating the centrifuge 1 at a low speed, the abrasive oil jetting pipe 4 is lowered to the centrifuge 1. The polishing oil A heated to 60 ° C from this jet pipe is applied to the stainless steel polishing chips in the centrifuge 1 for 2 minutes, and then the centrifuge 1 is further rotated at a high speed (1800 rpm) and further heated to 60 ° C. The polishing oil A thus obtained was applied to stainless steel polishing dust for 1 minute, and thereafter the high speed rotation of the centrifuge 1 was continued for 5 minutes. Since the polishing oil separated from the stainless steel polishing dust comes out from the polishing oil outlet 3 of the centrifugal separator 1, a part of the polishing oil is sent to the polishing oil heating tank 5 and a part thereof is sent to the oil storage tank 11. After that, the centrifuge 1 is stopped, and the stainless polishing dust is taken out from the polishing dust outlet 2 in the center of the lower part of the centrifuge 1 and carried out by the belt conveyor 13. When the heated polishing oil A is not jetted from the polishing oil jet pipe 4, the electromagnetic valve 8 is closed, the electromagnetic valve 9 is opened, and the heating tank 5 for the polishing oil 5, the pump 7 and the oil feed pipe 10 are heated. The polishing oil A thus circulated is circulated to prevent the temperature of the heated polishing oil A from decreasing and prepare for the next separation operation of the polishing oil A.

[Work]

The heated polishing oil A is hung on stainless steel polishing dust,
Due to the centrifugal force, the heat of the heated polishing oil during the passage through the layer of stainless steel polishing chips in the centrifugal separator 1 adheres to the stainless polishing chips and polishing chips. Since the oil is transferred to the oil and its temperature is increased, the viscosity of the polishing oil is lowered and the separation efficiency of the polishing oil in the centrifugal separator is increased. The amount of recovered oil is increased by about 3 to 5%. Especially in winter, the separation efficiency of the polishing oil is much better than the conventional one. That is, according to the method of the present invention, it is possible to obtain an average separation efficiency throughout the year.

〔effect〕

The present invention has the configuration as described above, and reduces the viscosity of the oil adhering to the metal scrap safely by direct contact with the heating oil in the centrifuge, without changing the properties of the oil,
It improves the economic efficiency by increasing the recovery rate of oil by the centrifugal action, and makes it easy to reuse the metal scrap because it has less oil adhesion and is of high industrial utility value.

[Brief description of drawings]

FIG. 1 is a “method for centrifuging oil attached to metal scraps” according to the present invention.
FIG. 3 is a schematic explanatory view of an apparatus for separating the polishing oil from the stainless scraps to which the polishing oil adheres using. In the figure, 1 is a centrifuge, 2 is a polishing dust removal port, 3
Is a polishing oil outlet, 4 is a heated polishing oil jet pipe, 5 is a polishing oil heating tank, 6 is a steam heating heater, 7 is a pump,
Reference numerals 8 and 9 are solenoid valves, 10 is an oil supply pipe, 11 is an oil storage tank, and 12 and 13 are conveyors.

Claims (1)

[Claims] 1. A method of centrifuging metal debris adhering oil, wherein metal debris having oil adhered thereto is put into a centrifuge and oil is separated from the metal debris by centrifugation. Heated oil obtained by heating a part of the oil
A metal characterized by being brought into direct contact with metal scraps of oil in a centrifuge to raise the temperature of the oil sticking to the metal scraps to reduce the viscosity of the oil and centrifuge. A method for centrifuging waste oil.