Suppression of floatability of pyrite in coal processing by carrier microencapsulation
Suppression of floatability of pyrite in coal processing by carrier microencapsulation
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DOI：
10.1016/j.fuproc.2010.12.028
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发表时间：
2011-05-01
影响因子：
7.5
通讯作者：
Tsunekawa, Masami
中科院分区：
文献类型：
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作者：
Jha, Rani Kumari Thakur;Satur, Jacqueline;Tsunekawa, Masami
载体微囊化，CME。是利用水溶性有机载体与金属离子结合在黄铁矿表面形成金属氧化物或氢氧化物薄层的技术。本研究通过动态气泡拾取实验和使用煤、黄铁矿的哈利蒙德管浮选实验，研究了使用 Si4+、Si(cat)(3)(2-) 的三儿茶酚配合物的 CME 对黄铁矿-煤分离的影响。和煤-黄铁矿混合物。矿物样品在 pH 4-9 的 0-5 mol m(-3) Si(cat)(3)(2-) 溶液中处理，处理时间为 1-24 小时。动态气泡拾取实验表明，CME处理将黄铁矿表面从疏水性转变为亲水性，但不影响煤的疏水性表面。在煤油作为捕收剂存在下，pH 7-9 的煤-黄铁矿混合物的 Hallimond 管浮选实验结果表明，用 0.5 mol (3) Si(cat)(3)(2-) CME 处理 1 h 后，黄铁矿的可浮性被选择性抑制，而未经处理的煤和黄铁矿均浮选出来。由此表明，CME处理对于抑制煤黄铁矿浮选中黄铁矿的可浮性是有效的。 (C) 2011 Elsevier B.V. 保留所有权利。
Carrier microencapsulation, CME. is a technique to form a thin layer of metal oxide or hydroxide on pyrite surface using a water soluble organic carrier combined with metal ions. The present study investigated the effect of CME using a tris-catecholato complex of Si4+, Si(cat)(3)(2-) on pyrite-coal separation by dynamic bubble pick-up experiments and Hallimond tube flotation experiments using coal, pyrite. and a coal-pyrite mixture. The mineral samples were treated in 0-5 mol m(-3) Si(cat)(3)(2-) solutions at pH 4-9 at treatment times of 1-24 h. Dynamic bubble pick-up experiments showed that CME treatment converted the pyrite surface from hydrophobic to hydrophilic but did not affect coal's hydrophobic surface. The results of the Hallimond tube flotation experiments of a coal-pyrite mixture at pH 7-9 in the presence of kerosene as a collector showed that pyrite floatability was selectively suppressed after 1 h CME treatment with 0.5 mol (3) Si(cat)(3)(2-) while both coal and pyrite were floated without the treatment. Thus indicates that CME treatment is effective in suppressing pyrite floatability in coal-pyrite flotation. (C) 2011 Elsevier B.V. All rights reserved.