Particle Size and Selectivity of Sulfide Flotation
A very important factor in froth flotation is the use of surface-active chemicals to form a froth in which minerals or coals are retained, thus allowing for valuable component enrichment. Despite the importance of frothers, surprisingly little systematic scientific work has been performed with the goal of quantifying frother mechanisms and the influence of particle […]
Air-Sparged Hydrocyclone for Fine Gold Flotation
Pilot-scale tests indicate that effective concentration of fine gold from Colorado River sands can be achieved by flotation with the air-sparged hydrocyclone. The fine sands (55% minus 400 mesh and 0.01 opt) from gravity concentration were processed with a 5-cm air-sparged hydrocyclone (capacity -1.0 tph dry solids). Concentrate grades as high as 5.0 opt were […]
Deister Flotaire Column Flotation Cell
The FLOTAIRE Flotation Cell is a column flotation cell designed to utilize aspirated gas in surface tension lowered water to generate extremely fine bubbles. The non-mechanical distribution of the fine bubbles throughout the column without agitation or turbulence allows for greater bubble/particle adhesion. The combined effect of these operating conditions shows enhanced flotation recovery of […]
Flotation Training
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Effect of Collector and Frother on Copper Flotation
The flotation process may be considered an interactive system consisting of many chemical, operational, and equipment variables. Changing any one of these variables causes an overall system response change. This study examines the effects of simultaneously changing the operating variables of: (1) frother concentration and air flow rate, and (2) frother concentration and collector concentration. […]
Collectorless Sulphide Flotation
Evidence for the floatability of sulphide minerals without collector is analyzed and it is shown that results obtained with ores, in contrast to those with single minerals or mineral mixtures, depend on many additional variables, some identified and others not. Because of the prevailing low levels and costs of collectors for most sulphide ores, it […]
Amine Flotation Systems
Using a Mark IV surface force apparatus, adsorption of dodecylamine hydrochloride on mica has been studied at pH 5.7 in the presence and absence of octanol. With amine alone, the repulsive forces between mica surfaces are reduced due to charge neutralization and attractive hydrophobic force; however, the latter is of relatively short-range with its decay […]
Oleate Adsorption at Calcite VS Fluorite Surfaces
In-situ Fourier transform infrared/internal reflection spectroscopy (FT-IR/IRS) has been extended to study oleate adsorption at a calcite surface. The birefringent and transmission limitations of calcite were overcome by using an appropriately designed optical setup and a near-infrared (NIR) spectrometer. An adsorption isotherm was determined at pH 9.2 and room temperature. Comparison with the fluorite/oleate adsorption […]
Flotation Tank Cells
The use of tank cells over the years has provided a means for low cost, space efficient, extra capacity in existing flotation circuits. In some cases, new plants have selected tank cells as the machine of choice. Typical tank cells use high efficiency impellers for mixing, which results in low power draw. Unfortunately, these mixers […]
Pyrrhotite Cathodic Decomposition
Grinding with steel balls often adversely affects the flotation separation of sulfide minerals. This is due mainly to the galvanic interactions among different sulfide minerals and steel grinding media. Since rest potentials of sulfide minerals are much higher than those of steel balls, they are always cathodic to grinding media materials. ½O2 + H2O + […]