Process for treating iron ore

FR3158518A1Pending Publication Date: 2025-07-25FIVES FCB
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Patent Information

Application Number
FR2024000628
Authority / Receiving Office
FR · FR
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-01-23
Publication Date
2025-07-25

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Abstract

Title: Method for treating an iron ore The invention relates to a method for treating an iron ore to increase its mass concentration of magnetic compounds, the method comprising in particular a step / E3 / of calcining an iron ore in a calciner (5) to obtain a calcined iron ore containing iron III oxides, a step / E4 / of reducing the iron III oxides present in the calcined iron ore, a step / E5 / of cooling said reduced iron ore to lower its temperature below a threshold temperature making it possible to avoid reoxidation of the iron II oxides and / or the triiron tetroxides. Figure for abstract: Figure 1
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Claims

equal to 950°C, preferably between 700°C and 900°C.

6. Method according to one of claims 1 to 5, in which the reducing gas (11) comprises dihydrogen and / or carbon monoxide.

7. A method according to claim 6, wherein the reducing gas (11) contains: - dihydrogen and carbon monoxide, or - dihydrogen.

8. Method according to claim 7, in which the quantity of reduction gas injected in the reduction step / E4 / corresponds to a quantity of between 0.33 and 3, preferably 0.4 to 1, moles of reactants per mole of iron III oxide present in the calcined iron ore.

9. Method according to one of claims 1 or 8, wherein during step / E5 / of cooling said reduced iron ore, the temperature of the reduced iron ore is lowered below a threshold temperature of between 200°C and 600°C, preferably between 350°C and 500°C.

10. Method according to one of claims 1 to 9, further comprising, after the cooling step / E5 / , a final cooling step / E6 / in an air cooling device (8) during which the temperature of the reduced iron ore is lowered to a temperature below 150°C, preferably below 60°C.

11. A method according to one of claims 1 to 10, further comprising, after the cooling step / E5 / , a step / E7 / of magnetic separation of the reduced iron ore in a magnetic separation system (9) to remove the magnetic molecules containing iron atoms or the magnetic mineral species containing iron atoms from the reduced and cooled iron ore (14). [Fig. 1] [Fig. 3] 7

Citation Information

Patent Citations

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  • Method for magnetizing, roasting and sorting low-grade iron ores

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  • Chain grate-tandem rotary kiln whole-particle fraction magnetic roasting process for refractory low-grade iron ore

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  • Three-stage suspension roasting-magnetic separation method for hematite-siderite mixed iron ores

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