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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >The effect of selective adsorption of dissolved aegirite species on the separation of specularite and aegirite
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The effect of selective adsorption of dissolved aegirite species on the separation of specularite and aegirite

机译：溶解的Aegizite物种选择性吸附对镜面和Aegitite分离的影响

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The separation of specularite from aegirite is challenging due to the similar floatability. Surface dissolution of minerals often occurs and affects their physicochemical properties. In order to investigate the effect of dissolved aegirite species on the separation of specularite and aegirite, the separation performance of these two minerals was explored through surface pretreatment before froth flotation. The adsorption mechanism was investigated via Zeta potential measurements, scanning electron microscope (SEM) tests, and X-ray photoelectron spectroscopy (XPS) analyses. Single mineral flotation experiments indicated that acidified pretreatment significantly reduced the floatability of aegirite (from 78.4% to 15.1%) and specularite (from 88.7% to 38.4%) at pH 10 with 6 x 10(-5) mol/L dodecylamine. The alkalified pretreatment only affected the flotation of aegirite (from 78.4% to 16.3%) at pH 10, while specularite maintained its floatability (85.4%). Mixed mineral flotation results confirmed that specularite was depressed while aegirite recovered its floatability with alkalified pretreatment. Zeta potential measurements and SEM analyses indicated that surface element dissolution occurred on the pretreated mineral surface, which increased the positive electrical property of minerals and weakened the adsorption of the dodecylamine. XPS results further revealed that the Si and Fe dissolved from the alkalified aegirite surface formed SiO32-, Fe(OH)(3), and FeOOH at the specularite surface, which depressed the flotation of specularite. (C) 2020 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
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