Back to results
US 4,141,373 AGranted
Method for deoiling metal scrap
AssigneeRJR Archer, Inc.
InventorsJohn M. Kartanson, Robert M. Neel
Life of this patent
Estimating the term…
Abstract
This invention relates to a method of removing oil from metal scrap, comprising the steps of introducing oil-laden scrap into a hermetically sealed chamber, evacuating said chamber, heating said scrap to vaporize the oil, and removing the vaporized oil from said chamber.
Claims8
A method of removing oil from metal scrap, comprising the steps of:
- (a) introducing an oil laden scrap into a hermetically sealable chamber;
- (b) evacuating said chamber;
- (c) introducing an inert gas into said chamber after evacuation to flush the chamber of air;
- (d) heating said inert gas within said chamber until the scrap metal is raised to a selected temperature;
- (e) reducing the pressure in said chamber after the metal has obtained the selected temperature by withdrawing the chamber atmosphere which includes a mixture of inert gas and vaporized oil;
- and
- (f) continuously introducing the inert gas into the chamber as the atmosphere within the chamber is being withdrawn.
4 more elements
A method of removing oil from oil-laden metal scrap comprising the steps of:
- (a) introducing said oil-laden scrap into the hermetically sealable chamber;
- (b) evacuating the chamber to remove the air;
- (c) flushing said chamber with an inert gas;
- (d) raising the temperature of the said metal scrap to a selected level by heating the inert gas and circulating said heated gas around the scrap metal;
- (e) during said heating step, increasing the amount of inert gas in the chamber while maintaining a slightly negative pressure within said chamber;
- (f) after said scrap has attained said selected temperature, reducing the pressure in said chamber, whereby the sensible heat of the scrap metal and oil will vaporize the majority of said oil;
- and
- (g) removing the majority of the vaporized oil from said chamber as the pressure in the chamber is reduced.
5 more elements
Dependencies are inferred from the claim text.