A kind of beneficiation method of magnetite concentrate to increase iron and reduce silicon

Abstract

The invention discloses a beneficiation method for extracting iron and reducing silicon from magnetite concentrate, which comprises the following steps: 1) the high-silicon magnetite concentrate is screened by a Derrick high-frequency fine screen to realize both classification and separation; 2) primary cationic reverse flotation and primary roughing are carried out on the screened product to obtain iron concentrate C1, and cationic reverse flotation tailings are combined with the product on the high-frequency fine screen to enter the follow-up classification and re-grinding operation; 3) theproduct on the high-frequency fine screen and the primary cationic reverse flotation tailings are combined and pumped to a cyclone for classification-tower milling-weak magnetic separation operation,weak magnetic separation concentrate is obtained, and weak magnetic separation tailings T1 are removed; 4) two-stage cationic reverse flotation and primary roughing are carried out on the weak magnetic separation concentrate a to obtain iron concentrate C2 and two-stage cationic reverse flotation tailings T2 are removed; after C1 and C2 are combined, the final iron concentrate has a TFe grade of 70.20% and a SiO2 content of 1.81%, which is the final high-purity iron concentrate. The invention has the advantages of high iron concentrate grade, high iron recovery, low SiO2 content, stable index,easy production management and the like.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to a beneficiation method for increasing iron and reducing silicon from high-silicon magnetite concentrate, especially suitable for magnetite concentrate with TFe grade of 62.0%-65.0%, SiO 2 Iron and silicon reduction of high silicon magnetite concentrate with content in the range of 10.5%-6.5%. Background technique [0002] my country's self-produced iron concentrate is mainly magnetite concentrate, its TFe grade is generally 62.0%-65.0%, SiO 2 The content is about 10.0%-7.0%. In recent years, the environmental protection situation has become increasingly severe. In order to provide "concentrate materials" for blast furnaces and enable blast furnace ironmaking to achieve energy saving and high efficiency, it is necessary to increase iron and reduce silicon from high-silicon magnetite concentrates. [0003] The beneficiation technologies commonly used to increase ir...

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Problems solved by technology

[0005] Its disadvantages are: ①The magnetic separation column has small processing capacity, large water consumption, and difficult operation; ②Although it occupies a small area, it occupies a large space and requires a high configuration height

③Magnetic separation column tailings have a high iron grade, and often need to return to the grinding operation in the previous process after concentrated magnetic separation, resulting in a large cycle in the whole process, which is not conducive to the production stability of the beneficiation process

"Research progress and application status of iron ore cationic reverse flotation technology" published in the second issue of 2012 of "Metal Mine" introduced in detail the research progress of iron ore cationic reverse flotation technology in recent years, such as: Benxi Iron and Steel Nanfen The ore concentrator uses Nanfen iron ore concentrate powder as raw material, uses dodecylamine as collector, and adopts a combined process of fine grinding-magnetic separation-cation reverse flotation. The test shows that the iron grade is 71.92%, and the iron recovery rate is 69.25%. SiO 2 Ultra-pure iron concentrate with a content of 0.324%, but the iron recovery rate of this process is low, and even when the iron grade is as high as 71.92%, SiO 2 content is still high

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