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Magnetic ore rescreening process for mixed iron ore

An iron ore and process technology, applied in the field of magnetic gravity screening of mixed iron ore, can solve the problems of difficult separation, high processing cost, large magnetic difference between magnetite and iron oxide ore, etc., to reduce the cost of mineral processing , low SiO2 content and coarse particle size

Active Publication Date: 2014-12-10
ANHUI JINRISHENG MINING
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Problems solved by technology

However, since the magnetite and iron oxide ore in the mixed iron ore have a very large magnetic difference, and they are closely symbiotic and embedded with each other, the separation is more difficult and the processing cost is also very high.

Method used

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  • Magnetic ore rescreening process for mixed iron ore

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Embodiment Construction

[0026] Below in conjunction with the specific embodiment of Anhui Jinrisheng Mining Co., Ltd. Zhouyoufang Concentrator, the present invention will be further elaborated, but not limited to the following embodiments:

[0027] 1) After the mixed iron ore produced by Zhouyoufang Iron Mine and specularite is crushed, it is first fed into a ball mill for grinding operation, and after the grinding and grading closed-circuit cycle operation process, the grading overflow fineness is controlled At -200 mesh 45-55%, the monomer dissociation degree of useful mineral magnetite and iron oxide ore can reach 70-80%, realizing the effective dissociation of 2 / 3 to 4 / 5 useful minerals and gangue minerals , the graded product is ore pulp, and the concentration of the ore pulp is 35-45% which is suitable for the separation operation requirements;

[0028] 2) The grinding and grading operation in step 1) is a closed-circuit cycle operation process, that is, the ore pulp after grinding by t...

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Abstract

The invention discloses a magnetic ore rescreening process for mixed iron ore. The process comprises the following process steps: performing primary ore grinding, performing primary grading, performing primary low intensity magnetic separation, performing primary strong magnetic separation, rescreening, performing high frequency screening and performing secondary ore grinding and selecting. According to the invention, partial qualified iron ore concentrate and partial tailings are thrown out preferentially under the condition that the dissociation degree of useful mineral monomers is insufficient after the primary ore grinding operation, the amount of materials subjected to secondary regrinding and reselecting is reduced, and the aim of reducing the ore dressing cost is achieved.

Description

technical field [0001] The invention relates to the technical field of beneficiation technology for recovering iron concentrate from mixed iron ore, that is, a mixed ore of magnetite and iron oxide ore, in particular to a magnetic gravity screening process for mixed iron ore. Background technique [0002] Iron and steel is the most widely used important metal material in the national economy, and iron ore is the raw material for iron and steel smelting. As we all know, most of the iron concentrate and high-grade iron ore needed for iron and steel smelting in my country rely on imports. In 2013, the import volume reached 800 million tons, with a total amount of 100 billion U.S. dollars. The price is subject to the monopoly of international mining giants, which seriously threatens my country. national economic security. [0003] my country is a country with very poor iron ore resources. Compared with foreign ores, the resource reserves are small, with the characteristi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C21/00B03B7/00
Inventor 孙希乐汪孟群章镇牛忠育王爱民吴江海牛国锋石云良刘苗华王鹏
Owner ANHUI JINRISHENG MINING
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