Abstract
Unideal beneficiation indexes are usually obtained during the flotation separation of malachite from associated quartz, which is partially because the copper-bearing species dissolved from malachite promote the adsorption of reagents on the quartz surface and further enable the activation of flotation of quartz. In the present work, the surface properties and flotation performance of quartz with the participation of the dissolved components of malachite were investigated under the sulfidization-xanthate system. Micro-flotation tests suggested that the floatability and hydrophobicity of quartz were significantly enhanced in the presence of the malachite supernatant. Additionally, ultraviolet-visible (UV) spectroscopy, infrared spectroscopy, zeta potential measurements, X-ray photoelectron spectroscopy (XPS) along with time-of-flight secondary ion mass spectrometry (ToF-SIMS) showed that the Cu species derived from the malachite supernatant were able to pre-adsorb on the surface of quartz, which favored the adsorption of subsequently added Na2S and NaIX on the surface of quartz. This work revealed why there are numerous complicated problems in separating malachite from quartz during the flotation.
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