Abstract
The results of a study on the flotation of gold-copper-porphyry ore are presented. The quality of the obtained concentrates is confirmed by the efficiency of using activated carbon to reduce the excess of reagents accumulating in the collective concentrates. Detailed studies of concentrates of copper selection using scanning electron microscopy revealed the presence of carbon in their composition. On the surface of gold and chalcopyrite particles, thin coal deposits and coatings were observed. Flotation of particles of gold and sulfide minerals can probably be improved by naturally hydrophobic or hydrophobized coal particles. “Carbon” coatings are selective with respect to the surface of sulfide minerals. No coal coatings were found on the surface of quartz grains and crystals.
Highlights
It is known that the schemes of collective flotation with a subsequent selection of the collective concentrate have a technological advantage, especially with respect to poor finely disseminated ores, namely: at the beginning of the process, the bulk of the host rocks is separated into tailings with a minimum metal content, and the collective concentrate being small part of the original ore undergoes flotation [1, 2]
An expedient way to remove excess collector from the liquid phase of the pulp and partial desorption of the collector from the surface of minerals of collective concentrates is its absorption by active carbons [1, 4]
Since the concentrate contains gold, copper and iron sulfides, to increase the contrast of the separation of chalcopyrite and pyrite, aeration of the pulp was carried out before copper selection; active carbon was added to absorb the excess collector accumulated in the collective concentrates; disodium phosphate was used to improve the separation of gold and chalcopyrite from pyrite
Summary
It is known that the schemes of collective flotation with a subsequent selection of the collective concentrate have a technological advantage, especially with respect to poor finely disseminated ores, namely: at the beginning of the process, the bulk of the host rocks is separated into tailings with a minimum metal content, and the collective concentrate being small part of the original ore undergoes flotation [1, 2]. To improve the conditions for the separation of collective concentrates before the selection cycle, various methods of removing the collector from the surface of minerals and from the liquid phase of the pulp can be used. An expedient way to remove excess collector from the liquid phase of the pulp and partial desorption of the collector from the surface of minerals of collective concentrates is its absorption by active carbons [1, 4]. They can be loaded into the pulp during conditioning. In the event of a collision, flotation-active coal particles in the pulp adhere to the hydrophobized areas of the surface of sulfide minerals (and free gold) and float
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