Additive-reinforced hematite magnetization roasting method

A technology of magnetized roasting and hematite, which is applied in mineral processing and metallurgy fields, can solve the problems of shortening roasting time and low conversion efficiency, and achieves the effects of easy acquisition, high iron recovery rate and simple operation

Active Publication Date: 2017-05-31
NORTHEASTERN UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems such as the low conversion efficiency of hematite to magnetite in the existing hematite magnetization roasting pretreatment process, to provide a method for additives to strengthen the magnetization roasting of hematite, and to improve the magnetization rate of hematite. Improve the conversion rate of iron ore reduction, while shortening the roasting time, to achieve the purpose of efficient and rapid production

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  • Additive-reinforced hematite magnetization roasting method

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Embodiment 1

[0028] Magnetite concentrate with a fineness of ≤100 mesh is used as an additive, added to the hematite powder with a fineness of ≤50 mesh and fully mixed, and the additive is loaded on the surface of the hematite particle by using the agglomeration performance of the ore powder particles. Crystal seeds form mixed ore powder; wherein the mass ratio of magnetite concentrate and hematite powder is 0.1:10; the iron grade of magnetite concentrate is 70.5%, and the iron grade of hematite is 31%;

[0029] Using a gas reducing agent as the medium, place the mixed ore powder in a fluidized reduction retention tank, and perform magnetization roasting in a suspension state at a roasting temperature of 500°C and a roasting time of 5 minutes to obtain roasted ore; the gas reducing agent is CO , the superficial flow velocity of the gas reducing agent is 0.1m / s during the suspension state magnetization roasting;

[0030] Quenching and cooling the roasted ore water to normal temperature, the...

Embodiment 2

[0033] Method is with embodiment 1, and difference is:

[0034] (1) The mass ratio of magnetite concentrate to hematite powder is 0.5:10; the iron grade of magnetite concentrate is 54%, and the iron grade of hematite is 34%;

[0035] (2) Using the gas reducing agent as the medium, place the mixed ore powder in the fluidized reduction residence tank, and carry out magnetization roasting in suspension state, the roasting temperature is 600°C, and the roasting time is 0.5min, to obtain the roasted ore; the gas The reducing agent is H 2 , the superficial flow velocity of the gas reducing agent is 0.3m / s during the suspension state magnetization roasting;

[0036] (3) The iron grade of magnetite powder is 66.7%, the conversion rate of hematite to magnetite is 92% (calculated after deducting the amount of magnetite in additives), and the recovery rate of iron is 89% (calculated after deducting the amount of magnetite in additives). calculated from the amount of iron ore).

[0037...

Embodiment 3

[0039] Method is with embodiment 1, and difference is:

[0040] (1) The mass ratio of magnetite concentrate to hematite powder is 1:10; the iron grade of magnetite concentrate is 43%, and the iron grade of hematite is 33%;

[0041] (2) Using the gas reducing agent as the medium, place the mixed ore powder in the fluidized reduction retention tank, and carry out magnetization roasting in suspension state, the roasting temperature is 550°C, and the roasting time is 2 minutes, to obtain the roasted ore; the gas reduction The agent is water gas, and the superficial flow velocity of the gas reducing agent is 0.2m / s when the suspension is magnetized and roasted;

[0042] (3) The iron grade of magnetite powder is 67.2%, the conversion rate of hematite to magnetite is 97% (calculated after deducting the amount of magnetite in additives), and the recovery rate of iron is 95% (calculated after deducting the amount of magnetite in additives). calculated from the amount of iron ore).

...

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Abstract

The invention provides an additive-reinforced hematite magnetization roasting method. The method includes the following steps that (1) magnetite concentrate serves as an additive and is added into hematite powder to be fully and uniformly mixed; (2), a gas reducing agent or a solid reducing agent serves as a medium to perform roasting on the mixed mineral powder; (3), water quenching cooling is performed till the normal temperature is reached, then ore grinding and magnetic separating are performed, and magnetite powder is obtained. The additive is easy to obtain, the magnetite concentrate in a mineral processing plant can be directly adopted, the iron recycling rate is high, any existing magnetization roasting equipment or procedure is not changed, and the additive-reinforced hematite magnetization roasting method has the advantages of being low in investment, simple in operation and economical and applicable.

Description

technical field [0001] The invention belongs to the technical field of mineral processing and metallurgy, and in particular relates to a method for additive-enhanced magnetization roasting of hematite. Background technique [0002] my country has a large number of hematite resources that are difficult to use by conventional beneficiation methods. The realization of its utilization can increase the reserves of available iron ore resources in my country, alleviate the tight supply of iron ore, and improve the security of iron ore supply security. Magnetization roasting pretreatment-magnetic separation is a typical and effective method for the development and utilization of refractory hematite resources, that is, the hematite ore is heated under certain atmospheric conditions for chemical reactions, and the weakly magnetic hematite ( Fe 2 o 3 ) into a strongly magnetic magnetite (Fe 3 o 4 ), while the magnetism of gangue minerals is almost unchanged. [0003] The magnetic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/10
CPCC22B1/10
Inventor 韩跃新余建文高鹏李艳军
Owner NORTHEASTERN UNIV
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