A beneficiation process for reducing silica content in iron concentrate

Abstract

The invention discloses a beneficiation process for reducing the content of silicon dioxide in iron concentrate, belonging to the technical field of beneficiation. Step 1 of the present invention, crushing: crush low-grade magnetite ore to -20mm, and then carry out high-pressure roller mill ultra-fine crushing and screening full-closed circuit wet pre-selection to -3mm coarse concentrate; step 2, grinding and magnetic separation: then carry out Second-stage stage grinding-classification-weak magnetic separation; Step 3, fine sieve screening: the magnetically separated coarse concentrate is fed into the fine sieve for sieving, the sieve size is 0.075-0.1mm, and the sieve returns to the second-stage grinding system ; Step 4, selection: under the fine sieve, feed it into the elutriation machine to select the elutriation concentrate; Step 5, magnetic desliming: the elutriation concentrate is then selected through the magnetic desliming tank to obtain the final concentrate, SiO 2 The content is reduced to below 3.5%. In the present invention, after two-stage grinding and weak magnetic separation, the elutriation machine and the magnetic desilting tank are used for two-stage continuous selection, which not only solves the problem of improving the quality of the concentrate and reducing impurities, but also solves the problem of SiO in the concentrate. 2 high content problem.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a mineral processing process for reducing the content of silicon dioxide in iron concentrate. Background technique [0002] Under the condition of market economy, iron and steel enterprises will pursue higher economic benefits and profits in the future, and put forward higher and higher requirements for the quality of iron concentrate. At present, the main quality indicators of high-quality pellets in the world have been raised to iron ≥ 66%, SiO 2 ≤3%, P≤0.05%, etc., so that the iron grade of iron concentrate, which is the main raw material in pellets, requires higher SiO 2 Only in this way can the technical and economic indicators of blast furnace ironmaking be improved, and conditions can be created to achieve high quality and low cost. [0003] Since there is a large amount of magnetic fine powder suitable for pellet production in my country, the production of pe...

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Problems solved by technology

[0010] Aiming at improving the quality and reducing SiO in the concentrate with low-grade magnetite ore in the prior art 2 high content, over-grinding, and low recovery rate of iron ore concentrate, the invention provides a beneficiation process for reducing the content of silicon dioxide in iron ore concentrate

By sieving the coarse and fine ore and then using the elutriation machine and the second-stage continuous selection of the magnetic desliming tank, it not only solves the problem of improving the quality of the concentrate and reducing impurities, but also solves the problem of SiO in the concentrate. 2 high content problem

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