用剪切絮凝法脱除高岭石中的赤铁矿
来源期刊：中国有色金属学报2000年第6期
论文作者：曹明礼 陈礼永 龚文琪 袁继祖
文章页码：934 - 936
关键词：剪切絮凝； 油酸钠； 高岭石； 赤铁矿
Key words：shear-flocculation; sodium oleate; kaolinite; hematite
摘 要：采用剪切絮凝工艺，可有效脱除高岭石中的赤铁矿。Auger电子能谱研究表明，油酸钠能够化学吸附于赤铁矿表面使其疏水。通过对赤铁矿颗粒间总作用势能的计算，推测赤铁矿在剪切搅拌力场的作用下发生疏水作用是其絮凝的主要原因，而在同样的条件下高岭石与油酸钠未发生相互作用，其颗粒仍保持高度的分散。
Abstract: Hematite was successfully removed from kaolinite by shear-flocculation， when sodium oleate was used. The mechanism of selective shearflocculationof hematite from kaolinite was studied by X-ray photoelectron spectroscopy (XPS)and the calculation of the total potential energy between hematite particles. It was found that the surface of hematite could adsorb chemically sodium oleate and made it hydrophobic， which would remain under the shear field. Under the samecondition， the surface of kaolinite does not adsorb sodium oleate and remainshydrophilic. The shear field of sufficient magnitude makes the hydrophobic ultrafine particles of hematite aggregate， whereas the hydrophilic ultrafine particles of kaolinite remain suspended in solution.
