Process for recovering chalcocite and chalcopyrite with non-uniform disseminated grain size from high pyritized skarn copper ores

Abstract

The invention discloses a process for recovering chalcocite and chalcopyrite with the non-uniform disseminated grain size from high pyritized skarn copper ores. The process for recovering chalcocite and chalcopyrite with the non-uniform disseminated grain size from high-pyrite skarn copper ores is characterized by comprising the steps of first-stage grinding, copper-sulfur mixed flotation, second-stage grinding, rapid copper-sulfur flotation, third-stage grinding and copper-sulfur separation column flotation for recovering fine copper particles. The process adapts to the characteristics of thenon-uniform disseminated grain size and different floatability of chalcocite and chalcopyrite, realizes the recovery of ultra-fine grain disseminated chalcocite and chalcopyrite, avoids the adverse effect of a micro-fine grain ore pulp system on the flotation process, and realizes the efficient separation of refractory high-iron copper ores.

Description

technical field [0001] The invention belongs to the technical field of mining engineering, and in particular relates to a process for recovering chalcopyrite and chalcocite with uneven embedded granularity in high-pyrite skarn copper ore. Background technique [0002] Copper is widely used in various fields of human life and is a particularly important strategic metal raw material in national economic construction. With the continuous development of easy-to-separate copper ore resources, easy-to-separate copper resources are increasingly depleted, and mineral processing workers pay more and more attention to the recycling of refractory copper resources. [0003] The copper minerals in the pyritic skarn-type copper ore are mainly chalcopyrite, chalcocite and a small amount of cerulis and arsenic tetrahedrite. The gangue minerals are mainly calcium-magnesium-bearing silicate minerals. There are tremolite, chlorite, serpentine, mica and kaolinite. Some chalcopyrite and chalco...

AI Technical Summary

Problems solved by technology

Parts of chalcopyrite and chalcocite are often embedded in pyrite in the form of fine particles, resulting in extremely uneven particle size of copper minerals. However, if the content of pyrite is high, if the copper minerals cannot be fully dissociated, it will inevitably cause loss of copper minerals

However, the dissociation of copper mineral monomers and the increase of grinding fineness will cause transitional mudification of gangue minerals such as kaolinite, and the fine mud cover on the surface of coarse particles will deteriorate the selectivity of the flotation process and affect the grade of copper minerals

At present, there are mainly two processes for the treatment of this type of ore in mines: preferential copper selection and copper-sulfur mixed separation and separation. When the copper-preferential process suppresses pyrite, the joint growth of copper minerals and pyrite is simultaneously suppressed, resulting in copper Mineral loss, this process is only suitable for massive copper-bearing pyrite with coarse particle size

Although copper-sulfur mixed separation and re-separation recover some fine-grained copper minerals in pyrite to a certain extent, it is still difficult to recover the fine-grained copper minerals embedded in pyrite. The disadvantages of traditional conventional flotation machines such as low dispersion, large size and high degree of turbulence in fine-grained minerals are amplified. In addition, conventional sulfur inhibitors often make the foam sticky, which often leads to poor copper mineral concentrate grades. Low, not suitable for ores with dense symbiosis of pyrite and copper minerals

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