Abstract
Experiences in AMAX plants and laboratories have shown that petroleum hydrocarbons differ in their effectiveness for enhancing the natural floatability of molybdenite. A research program was carried out to identify the characteristics of a petroleum hydrocarbon which make it suitable as an oily collector for molybdenite flotation. To provide a systematic set of flotation oils commercial refinery base stocks were blended with diesel fuel. The effects on molybdenite flotation of the following properties of the blended oils were investigated: average molecular weight, kinematic viscosity, molecular structure, density, and weight fraction of base stock in the blend. Standard laboratory batch-flotation tests were conducted using 40 different blended oil collectors. These data were compared with the molybdenite flotation results obtained with the Amoco and Texaco oils regularly used at the AMAX plants and the test results correlated by step-wise multiple-regression analysis. The experimental evidence indicates that a two-component blend of a higher molecular-weight base stock and a lower molecular-weight diluent oil can be a better molybdenite collector than a single-component oil. Furthermore, the flotation oils blended from naphthenic base stock gave superior flotation results whereas those blended from aromatic stock resulted in inferior molybdenite flotation.
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