金属离子对红柱石的吸附与活化

ADSORPTION AND ACTIVATION OF METAL IONS ON ANDALUSITE

研究了Ｆｅ３＋、Ａｌ３＋、Ｍｇ２＋、Ｇａ２＋四种金属离子在红柱石上的吸附行为及其对红柱石可浮性的影响。发现Ｆｅ３＋对红柱石—十二烷基磺酸钠浮选体系具有活化作用，而Ａｌ３＋、Ｍｇ２＋、Ｃａ２＋三离子对红柱石的浮选起抑制作用。认为金属离子吸附在矿物表面上是其具有活化作用的前提条件。提出用吸附沉淀百分数（ＰＡＰ）表示金属离子对矿物的活化能力，ＰＡＰ越大，活化能力越强，ＰＡＰ小到一定程度，金属离子就起抑制作用。

The adsorption behavior of metal ions,such as Fe3+,AI3+, Mg2+,Ca2+ on andalusite and their influence on andalusite floatability are investigated in detail.It is discovered that iron ion Fe3+ can activate andalusite flotation in the presence of sodium dodecyl sulfonate.However,metal ions,such as Al3+,Mg2+,Ca2+ depress andalusite flotation under the same conditions.It is recognized that adsorption of metal ions on mineral surface is the prerequisite for activation.The authors put forward a percentage of adsorptive precipitation (PAP) representing metal ions'activating power on mineral flotation.The greater the PAP of a metal ion,the stronger its activating power is.When PAP of a metal ion is smaller than a certain value,the metal ion will depress the flotation of minerals.