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ORE PREPARATION
ArticleName Effect of magnetic pulse treatment upon titanium magnetite ore grindability and crushability
DOI 10.17580/or.2016.04.01
ArticleAuthor Chizhevskiy V. B., Shavakuleva O. P.
ArticleAuthorData

Nosov Magnitogorsk State Technical University (Russia):

Chizhevskiy V. B., Doctor of Engineering Siences, Professor, Professor

Shavakuleva O. P., Ph. D. in Engineering Sciences, Associate Professor,

E-mail (common): magtu_opi@mail.ru

Abstract


A possibility for reduction of titanium dioxide content in concentrates was studied, since its high content prevents processing of mediumtitanium grade magnetite ores. Taking into consideration inhomogeneous impregnation of minerals and their close interpenetration, in order to provide for more selective liberation of intergrowths, improve processing results and reduce grinding costs, ores softening prior to grinding is accomplished by means of magnetic pulse treatment. The studies were performed on the Kopanskoye and Maly Kuybas deposits mediumtitanium grade magnetite ores, located in the Chelyabinsk Region. Mass fraction of total iron in feed ores was 29.41 and 32.80 %, respectively, and that of titanium dioxide — 9.27 and 10.22 %. It was established, that treatment of the Kopanskoye deposit ore with intensity of 1.28·103 kA/m results in increase of 0.071–0 mm size fraction content from 50.21 to 67.34 %, while further increase of intensity leads to only to a small gain in final size fraction production. Increasing duration of treatment to 4 min leads to increase of 0.071–0 mm size fraction content to 71.42 %. Magnetic pulse treatment increases grinding process rate, and necessary duration of grinding may be decreased by the factor of 1.64–1.51, depending on required grinding size. Wet magnetic separation of 0.071–0 mm size fraction, produced after magnetic pulse treatment and grinding, provides for titanium dioxide mass fraction reduction in magnetic product from 4.82 to 3.04 % with simultaneous increase of iron mass fraction from 60.11 to 63.95 %, as well as increase of iron recovery from 72.0 to 80.19 %. In treatment of the Maly Kuybas deposit ore, titanium dioxide mass fraction is reduced from 6.21 to 4.72 %, and that of iron is increased from 59.47 to 61.93 %. Magnetic pulse treatment provides for more complete and selective liberation of minerals intergrowths, permitting to process medium-titanium grade ores with mixing of produced concentrate to magnetite concentrate.

keywords Titanium-magnetite ore, titanium dioxide, magnetic pulse treatment, grinding, intergrowths, magnetic separation, magnetic pulses, magnetic field intensity
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