Magnetic separation method for iron carbide
AssigneeTH Engineering France S.A.
InventorJacques Ruer
Life of this patent
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Abstract
A method for purifying iron carbide begins by feeding ore to a reaction chamber. A mixture of iron, iron oxides, gangue, and iron carbides is extracted from the reaction chamber. The temperature of the mixture is then adjusted to a range of 400.degree.-500.degree. C. The mixture, at the adjusted temperature, is subjecting to a first magnetic field for separating the mixture into a magnetic fraction including iron and iron oxides from a non-magnetic fraction including gangue and iron carbides. This is followed by a cooling of the non-magnetic fraction of gangue and iron carbides below the Curie temperature of iron carbide. The gangue and iron carbides are subjecting to a second magnetic field for separating the iron carbides, that become magnetic, from the gangue that remains non-magnetic.
Claims13
Process for the purification of iron carbide, wherein:
- a mixture of iron carbide, iron oxides, iron and gangue is extracted from a reaction chamber,
- the emerging mixture is optionally slightly cooled, any heat recovered being used for heating the products in a recycling phase, in an atmosphere of composition suitable for not destroying the iron carbide,
- the mixture, whose temperature lies between 230.degree. and 575.degree. C., passes through a first magnetic field, for separating it into a magnetic fraction of iron and oxides and a non-magnetic fraction of, iron carbide and gangue
- the non-magnetic fraction is sent to a chamber in which it is cooled to a temperature below the Curie temperature of iron carbide,
- the mixture consisting of gangue and iron carbide passes through a second magnetic field, for separating it into a magnetic fraction of iron carbide and a non-magnetic fraction of gangue.
A method for purifying iron carbide comprising the steps:
- feeding ore to a reaction chamber;
- extracting a mixture of iron, iron oxides, gangue, and iron carbides from the reaction chamber;
- adjusting the temperature of the mixture to a range of 400.degree.-500.degree. C.;
- subjecting the mixture, at the adjusted temperature, to a first magnetic field for separating the mixture into a magnetic fraction including iron and iron oxides from a non-magnetic fraction including gangue and iron carbides;
- cooling the non-magnetic fraction of gangue and iron carbides below the Curie temperature of iron carbide;
- and
- subjecting the gangue and iron carbides to a second magnetic field for separating the iron carbides, that become magnetic, from the gangue that remains non-magnetic.
Dependencies are inferred from the claim text.