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Method for converting natural non-magnetic iron ore into magnetite

A non-magnetic, magnetite technology, applied in chemical instruments and methods, magnetic separation, filtration, etc., can solve the problems of high heating and roasting temperature, no promotion value, and difficult ore, and achieve a high degree of mechanization and continuous production Sexual production, the effect of shortening the production and processing cycle

Inactive Publication Date: 2011-08-31
SHANGHAI MAIFENG MICROWAVE EQUIP
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Problems solved by technology

The former kiln roasting reduction is mainly suitable for the reduction of high-grade iron ore, and it is more difficult for low-grade ore; secondly, the heating and roasting temperature is also high; thirdly, the processing point needs coal or other gas resources; these factors limit The application of this technology in non-magnetic iron ore
In the latter method, the temperature of microwave reduction of hematite is above 1000°C. In practical application, the cost of converting hematite into magnetite is too high. This energy consumption is close to the cost of direct ironmaking, so it has no promotion value.

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Embodiment Construction

[0061] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0062] In a preferred embodiment of the present invention, the method for converting natural non-magnetic iron ores such as natural limonite, hematite, siderite, tailings after magnetic separation into magnetite includes the following steps:

[0063] (1) crushing and crushing process;

[0064] (2) Screening process; if it is a non-magnetic tailings raw material, the process (1), (2) can be omitted;

[0065] (3) Ingredients process;

[0066] (4) microwave roasting process;

[0067] (5) heat preservation process;

[0068] (6) Cooling process;

[0069] (7) Grinding process;

[0070] (8) Magnetic separation process.

[0071] Among them, the pulverization process is coarse pulverization first, and then further fine pulverization. The operating co...

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Abstract

The invention discloses a method for converting natural non-magnetic iron ore into magnetite by a microwave method, and particularly relates to a method for converting non-magnetic iron ore such as natural limonite, hematite and siderite into the magnetite through processes of crushing, smashing, sieving, mixing, microwave roasting treatment, heat preservation, cooling, grinding, magnetic separation and the like. In the method, the production process is intact, the mechanization degree is high, production processing cycle is shortened, production processing speed is improved, the conversion rate of a magnetite powder product is high, and the continuous production can be realized; and the device simultaneously has the characteristics of energy conservation and high efficiency, and can improve the quality of products and the stability of the yield.

Description

technical field [0001] The invention relates to a method for converting natural non-magnetic ores, such as limonite, hematite and siderite, into magnetite powder, which belongs to the technical field of iron ore beneficiation and processing. technical background [0002] Non-magnetic iron ores mainly include limonite, hematite and siderite. [0003] Among them, limonite is a hydrous iron oxide ore, which is formed by the weathering of other iron ores. It is the most widely distributed in nature, and its chemical formula is nFe 2 o 3 mH 2 O (n = 1 to 3, m = 1 to 4). Limonite is actually made of goethite (Fe 2 o 3 h 2 O), goethite (2Fe 2 o 3 h 2 O) and a mixture of iron oxides and argillaceous substances containing different water of crystallization. Most of the iron-bearing minerals in limonite are 2Fe 2 o 3 h 2 Existing in the form of O, containing more than 30% water, generally brown in various shades, blocky, loose porous or powdery, non-magnetic. [0004] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B1/02B02C1/02B07B1/28B03C1/02
Inventor 陈玉麟陈玉麒
Owner SHANGHAI MAIFENG MICROWAVE EQUIP
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