Production of nano sized ferrite
AssigneeJernkontoret AB
InventorsAnna NAKANO, Seshadri SEETHARAMAN, Volodymyr SHATOKHA
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Abstract
Method for producing nano sized ferrite particles from a metallurgical slag, the method including the steps of: a) providing a ladle with a molten slag including CaO, SiO2, FeO, and at least one of MnO, Cr2O3, V2O3. b) oxidizing the slag at a temperature in the interval of 1573K-1773K (1300-1500° C.) for 10-90 minutes, c) removing at least a portion of the slag from the ladle d) cooling the removed slag portion to a temperature below 373K (100° C.), e) extracting nano sized manganese ferrite and/or chromium ferrite and/or vanadium ferrite particles from the cooled portion.
Claims20
Method for producing nano sized ferrite particles from a metallurgical slag, the method including the steps of:
- a) providing a ladle with a molten slag including CaO, SiO2, FeO, and at least one of MnO, Cr2O3, V2O3.
- b) oxidizing the slag at a temperature in the interval of 1573K-1773K (1300-1500° C.) for 10-90 minutes,
- c) removing at least a portion of the slag from the ladle,
- d) cooling the removed slag portion to a temperature below 373K (100° C.), and
- e) extracting nano sized manganese ferrite and/or chromium ferrite and/or vanadium ferrite particles from the cooled portion.
Method for producing a nano sized manganese ferrite powder having an average particle size below 50 nm, the method comprising the steps of:
- a) providing iron (II) oxalate dehydrate and manganese (II) oxalate in amounts corresponding to mole ratio between iron and manganese in the range of 1.5-2.5,
- b) mixing and dissolving the provided iron (II) oxalate dehydrate and manganese (II) oxalate in water,
- c) evaporating the water from solution of step b) to provide a dried mixture, and
- d) heat treating the dried mixture of step c) at a temperature above 500° C. but not higher than that at which the mix remains in solid state, during a time period in the range of 0.5-10 hours, while having a neutral or oxidizing atmosphere.
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Dependencies are inferred from the claim text.