Staged screw separation of magnetite concentrate

Prokopyev, S. A.; Pelevin, A. E.; Napolskikh, S. A.; Gelbing, R. A.

doi:10.17580/or.2018.04.06

Cited by 6 publications

(4 citation statements)

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“…The theory and practice of using screw separation in grinding and dressing schemes has been studied quite extensively [7][8][9][10][11]. The results of the magnetite ore dressing according to the existing scheme and according to the scheme with the use of screw separation to separate concentrate No.…”

Section: Screw Separation Applicationmentioning

confidence: 99%

“…1 (Fig. 1) [11] Product Output to ore, % Fe weight content, % Fe separation to ore, % During industrial tests, a concentrate (heavy product) with an iron weight content of 63.1% was obtained with an output of 21.5% to ore and iron extracted into a concentrate of 32.5% to ore. Compared to the standard scheme, the total yield of concentrate increased by 1.1%, and the extraction of iron into concentrate increased by 1.5% (Table 2).…”

Section: Screw Separation Applicationmentioning

confidence: 99%

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Separation of magnetite concentrate before the last grinding stage

2020

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For magnetite and titanium magnetite ores, it is possible to use technology with the separation of concentrate before the last grinding stage. The possibility of staged separation of iron concentrate is due to different physical-mechanical properties of magnetite and rock minerals. The results of industrial and laboratory tests on the use of special magnetic separators with special structure, Derrick screen and screw separators in iron ore dressing schemes are presented. A comparison of proven dressing methods is performed. The choice of a specific dressing method for the staged separation of magnetite concentrate before the last grinding stage is determined by the properties of the base ore and the economic justification.

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Section: Screw Separation Applicationmentioning

confidence: 99%

Section: Screw Separation Applicationmentioning

confidence: 99%

Separation of magnetite concentrate before the last grinding stage

2020

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“…Magnetite is a highly magnetic mineral, so the main method of its beneficiation is magnetic separation in a weak field with induction from 0.16 to 0.25-0.5 T [2,3]. Other beneficiation methods can be used: flotation and gravity separation [4,5], as well as fine hydraulic screening [6,7], in which the undersize product is characterized by an increased iron content.…”

mentioning

confidence: 99%

“…2. The following can be used as beneficiation methods and devices for the staged concentrate separation: drum magnetic-gravity separators with a modified bath [23]; drum separators with an alternating magnetic field [24, 25]; MGS magnetic-gravity separators of a cylindrical type with a vertical direction of movement of the separated products [26]; fine screening [27]; gravity separation (screw separation) [5].…”

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confidence: 99%

Iron ore beneficiation technologies in Russia and ways to improve their efficiency

Pelevin

2022

PMI

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Increasing the efficiency of crushing circuits is associated with a decrease in the particle size of finely crushed ore and the use of dry magnetic separation of crushed ore. Reducing grinding costs is achieved by using drum mills jointly with mills of other designs. The use of automation systems, slurry demagnetization, technologies with staged concentrate separation, and beneficiation and fine screening in a closed grinding cycle lead to a reduction in grinding costs. The main industrial technology for improving the quality of concentrate is its additional beneficiation using regrinding, fine screening, flotation, and magnetic-gravity separators. Increasing the integrated use of iron ore raw materials is associated with an increase in the yield of iron concentrate and the production of hematite concentrate during the beneficiation of hematite-magnetite ores and ilmenite concentrate during the beneficiation of titanomagnetite ores. Incremented concentrate yield is possible by using magnetic separators with an increased magnetic induction up to 0.25-0.5 T in the first stages of beneficiation. To obtain hematite and ilmenite concentrates, combined technologies can be used, including fine screening, high-gradient magnetic, gravity, flotation, and electrical separation.

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Production of hematite concentrate from hematite-magnetite ore

Pelevin

2020

Gorn. inf.-anal. bull.

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The main useful minerals in composition of hematite-magnetite ore are magnetite and hematite. Magnetite is extracted by wet magnetic separation in weak magnetic field with production of magnetite concentrate and nonmagnetic product. The nonmagnetic product is a feed of the processing circuit for hematite. It is difficult to produce concentrate with iron content of 58-60 mass % if hematite grains are smaller than 0.05 mm. For hematite concentrate production from finely disseminated hematite-magnetite ore, the magnetic-gravitation and magnetic- flotation circuits are designed. This article discusses the magnetic-gravitational separation circuit for hematite grains smaller than 0.05 mm. The first stage of this circuit is fine screening intended to remove large particles. The second stage is high-gradient magnetic separation. The high-gradient separator performance depends on the mineral composition of initial ore and on the rate of mineral dissociation. In finely disseminated hematite-magnetite ore, the associate minerals are mainly represented by quart and amphiboles. Magnetic properties of hematite and amphiboles are similar. For this reason, the high-gradient magnetic separation product contained hematite, amphiboles and quartz-magnetic accretions. The iron content of the magnetic product was 28.9 %. Thus, additional treatment is required, and separation by gravity is applicable in this case. The gravitational separation was carried out on centrifugal concentrator, jigging machine, spiral separator and sluice, and on concentration table. The best results are obtained on the concentration table. The iron content of the final concentrate was 62.3 %.

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Staged screw separation of magnetite concentrate

Cited by 6 publications

References 0 publications

Separation of magnetite concentrate before the last grinding stage

Separation of magnetite concentrate before the last grinding stage

Iron ore beneficiation technologies in Russia and ways to improve their efficiency

Production of hematite concentrate from hematite-magnetite ore

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