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ArticleName Improvement of quality of refractory clays at Kumak deposit
DOI 10.17580/gzh.2017.12.12
ArticleAuthor Grishin I. A., Burmistrov K. V., Sokolovsky A. V.

Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia:

I. A. Grishin, Head of a Chair, Associate Professor, Candidate of Engineering Sciences,
K. V. Burmistrov, Associate Professor, Candidate of Engineering Sciences


Geotechnology Scientific and Technological Center, Chelyabinsk, Russia:
A. V. Sokolovsky, Chief Executive Officer, Doctor of Engineering Sciences


Refractories are highly important products for the metallurgy, ceramics manufacture, paint-and-varnish industry, paper making etc. At present all companies engaged in mining and processing of kaolin clays have accumulated huge piles of substandard products on the ground surface. Quality of clays in subsoil is also unstable. Such raw material is only applicable for manufacturing standard quality products after preliminary processing. This article addresses the specified problem. In terms of Kumak deposit, the authors consider the technology of clay quality improvement through reduction of iron content of the initial raw material in order to obtain the wanted quality feedstock for the production of refractories. The article discusses iron occurrence forms in kaolin clays and shows mass fraction of oxides which influence the quality of the raw material. The distribution of oxides of aluminium, silicium and ferrum per size grades is illustrated. In the test sample of kaolin clay, the aluminium oxide content of coarse particles is increased while ferrum oxides are distributed uniformly. Based on the size grade distribution of components, pretreatment by sizing in aqueous medium and by magnetic separation is suggested. The article reports experimental results on sizing of Kumak deposit clay on a laboratory cyclone and subsequent magnetic separation of the cyclone product in varied-strength magnetic field. It is shown that the production of high-quality material requires the magnetic field strength of 1200 kA/m, the regular quality refractory products need the magnetic field with a strength up to 120 kA/m. The eff ect of consumption of various flocculants on settling velocity of final product for the manufacture of refractories is also discussed. The tests included flocculants BASF’s series Magnafloc® developed specifically for the mining industry: Magnafloc® 10; 1011; 333; 336; 430; 156; 5250. It is decided that Magnafloc® 333 is the best variant as it results in the least turbidness of discharge and in the highest density of the thickened product. Developed in the course of the research implementation, the clay processing technology includes sizing, magnetic separation and dewatering of kaolin product; in addition, it is proved to be efficient to use non-ionic high-molecular flocculants with the molecular mass higher than 200 atomic mass units.

keywords Kaolin, processing, magnetic separation, iron content, sizing, pre-concentration

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