Titanium oxide removal from clays by high gradient magnetic separation method.
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概要
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Titanium oxide (TiO<SUB>2</SUB>) removal by high gradient magnetic separation (HGMS) method on 16 clays collected from 8 localities was investigated. Effects of the operation conditions on the TiO<SUB>2</SUB> removal, identification of TiO<SUB>2</SUB> mineral and its micromorphology were studied. Following results are discussed.<BR>(1) TiO<SUB>2</SUB> removal from clays varied from 15 to 100% under the conditions of 14.5 kG magnetic field strength and 38.4 m/hr linear velocity in the canister. According to the degree of the TiO<SUB>2</SUB> removal, clays are divided into three types as follows:<BR>a) TiO<SUB>2</SUB> removal>80%; 5 clays such as Ohtoge kaolins and Itaya clays, <BR>b) TiO<SUB>2</SUB> removal=50-72%; 8 clays such as Ohtoge sericite, Sendatsu clays, Kuji clays, etc., <BR>c) TiO<SUB>2</SUB> removal=l5-38%; 3 clays such as Murakami sericites and Aokiba clay.<BR>(2) Good results for TiO<SUB>2</SUB> removal were obtained at the high magnetic field strength (9.7-14.5 kG) and at considerably lower linear velocity (22.1-38.4 m/hr).<BR>(3) Only anatase was identified as TiO<SUB>2</SUB> contained mineral by the x-ray diffraction method. The 101 peak intensity of anatase is dependent on the TiO<SUB>2</SUB> content of the clay.<BR>(4) In Ohtoge kaolin, anatase is occasionally found as pillar-like or plate-like euhedral crystal. Their particle sizes are relatively large and almost around 10-30 μm.<BR>(5) At the most suitable condition for TiO<SUB>2</SUB> removal (14.5 kG, 38.4 m/hr with matrix FW), the contents of TiO<SUB>2</SUB> and Fe<SUB>2</SUB>O<SUB>3</SUB> of Ohtoge kaolin B decreased from 0.26 wt% to 0.05 wt% (TiO<SUB>2</SUB> removal=81%) and from 0.43 wt% to 0.31 wt% (Fe<SUB>2</SUB>O<SUB>3</SUB> removal=28%), respectively. The yield of nonmagnetics was 93%. Nonmagnetics separated from Itaya clay A contain 0.01 wt% TiO<SUB>2</SUB> (TiO<SUB>2</SUB> removal=80%) and 0.54 wt% (Fe<SUB>2</SUB>O<SUB>3</SUB> removal=62%).
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