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Platova R.A.,ekhanov Russian Economics University
Glass and Ceramics (English translation of Steklo i Keramika) | Year: 2014

The removal of iron from kaolin becomes more effective when bioreduction of the iron is added to the technological process. The process can be accelerated by combining as factors the moisture and temperature of the suspension, the pH–Eh of the medium, the composition of the nutrient medium, and the seeding material from a community of microorganisms. In a stagnant moisture regime of a kaolin suspension iron bioreduction is accompanied by the formation of Fe(II)–Fe(III)-containing minerals, and as a result the reduction process stops. © 2014, Springer Science+Business Media New York. Source


Platova R.A.,Moscow State University | Maslennikova G.N.,The State University of Management | Platov Yu.T.,ekhanov Russian Economics University
Glass and Ceramics (English translation of Steklo i Keramika) | Year: 2013

The reasons for the inefficacy of iron removal from Zhuravlinyi Log kaolin by dry grading into fractions method are analyzed. A biochemical kaolin-enrichment technology is proposed. Different process regimes and treatment conditions boosting iron reduction and removal from kaolin are studied. © 2013 Springer Science+Business Media New York. Source


Platova R.A.,ekhanov Russian Economics University
Glass and Ceramics (English translation of Steklo i Keramika) | Year: 2015

The efficiency of iron removal in the biochemical method of processing kaolin depends on the particle size, magnetic properties, and structural organization of the iron minerals (weakly crystallized and crystalline magnetically ordered). It is shown that preliminary disaggregation of kaolin particles during wet milling and bioreduction of Fe(III) during storage of a kaolin suspension followed by conversion of the iron compounds from weakly magnetic and slightly soluble into soluble or strongly magnetic promotes the removal of iron from kaolin. It was found that there is an advantage to combining storage of a kaolin suspension with kaolin washing with ammonium oxalate followed by magnetic separation. © 2015, Springer Science+Business Media New York. Source


Platova R.A.,Moscow State University | Kondrukevich A.A.,Mendeleev University of Chemical Technology | Platov Y.T.,ekhanov Russian Economics University
Glass and Ceramics (English translation of Steklo i Keramika) | Year: 2012

The spectral-colorimetric and luminescence characteristics of porcelain with neodymium oxide addition are studied. It is shown that whiteness increases when a small amount of neodymium oxide is present and that the coloring process begins as the neodymium oxide content increases. The increase in whiteness of porcelain is explained by a combination of two optical effects: increase of reflection in the blue-azure range of the visible spectrum due to sensitization radiation of the neodymium ion in the region 390-480 nm and a yellowness decrease due to the absorption of the neodymium ion in the interval 60-590 nm and a shift of the reflection peak into the blue-green region of the spectrum. © 2012 Springer Science+Business Media, Inc. Source


Platova R.A.,ekhanov Russian Economics University | Sokolova D.S.,Russian Academy of Sciences | Platov Y.T.,ekhanov Russian Economics University
Glass and Ceramics (English translation of Steklo i Keramika) | Year: 2016

The effect of nutrient liquids with the bacteria Acinetobactre johnsii str. J221 and Pseudomonas aeruginosa str. G.d. on the rheological properties of porcelain slip is studied. The surface activity of the nutrient liquid promotes a reduction of the fluidity and thixotropic hardening of porcelain slip. The mass increase of the casting upon pouring is due to the hydrophobization of the surface of the slip particles. The thickening of the porcelain slip is interrelated with the change in the redox state of the medium from weakly to strongly basic, favorable for the development of an aborigennic community of anaerobic microorganisms. © 2016 Springer Science+Business Media New York Source

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