ELECTROKINETIC, INFRARED AND FLOTATION STUDIES OF SCHEELITE AND CALCITE WITH OXINE, ALKYL OXINE, OLEOYL SARCOSINE AND QUEBRACHO

Oxine and alkyl oxine were used as scheelite modifiers in scheelite fl otation and their adsorption mechanism was investigated. Electrokineti c and infrared studies on the pure scheelite and calcite surfaces have been carried out with oleoyl sarcosine, oxine, alkyl oxine and quebra cho. These studies showed that alkyl oxine increases the negative zeta potential of scheelite to a less negative value whereas the negative zeta potential value of calcite was not changed with this reagent. On the other hand, zeta potentials of both calcite and scheelite became m ore negative upon treatment with quebracho. Conditioning af calcite an d scheelite minerals individually with alkyl oxine before quebracho ad dition increased the flotation efficiency of oleoyl sarcosine in schee lite flotation but no changes occured in calcite flotation. Infrared s tudies also showed that, oxine and alkyl oxine were chemically adsorbe d on the scheelite surface and not on the calcite surface.