Method for treatment of oil contaminated filings of magnesium and magnesium alloys
AssigneeNorsk Hydro a.s.
InventorSurendra K. Saxena
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Abstract
A method for the treatment of waste products, in particular oil-contaminated chips of reactive metals such as magnesium and magnesium alloys includes heading the chips to a temperature close to or above the boiling point of the oil and below the melting point of the metal. Preferably, a closed, cylindrical rotating furnace having inner, slanting blades/wings on the wall of a furnace is used. Chips are fed from a container via a transporting device into the furnace. A closed outlet system conducts the chips from the furnace. Oil vapour is conducted out of the furnace and is coalesced.
Claims17
A method for removing volatile material from volatile material-contaminated chips of reactive or inflammable metals, said method comprising;
- introducing said contaminated chips into a closed system and maintaining said chips continuously in motion within said system;
- maintaining substantially a normal air atmosphere within said system without the addition thereto of external reducing gas;
- and
- indirectly heating said chips within said system to a temperature close to or above the boiling point of said volatile material but lower than 430.degree. C., thereby causing evaporation of said volatile material such that said chips are left substantially free of said volatile material, and thereby causing coating of said chips with a thin layer of carbonaceous material resulting from said evaporation and thus protecting said chips from contact with air.
Dependencies are inferred from the claim text.