| The beneficiation recovery of the superfine and refractory copper-nickel sulphide ore is always a difficult problem of comprehensively utilizing copper-nickel mineral resources. The traditional technologies such as "copper and nickel bulk floatation" and "copper and nickel preferential floatation" are used for the separation, but because the ore property is complicated, separation is difficult, and also due to the affects of serpentine gangue minerals and inevitable ion such as Cu2+and Fe3+, there are some difficult problems in the traditional technologies, including the difficulty of copper-nickel separation and pentlandite activation after suppressed, which prevent the beneficiation recovery of the superfine and refractory copper-nickel sulphide ore. Sichuan Danba copper-nickel sulphide ore was taken as the object for this paper, the new floatation technology and mechanism of the superfine and refractory copper-nickel sulfide ore was studied, and it can provide the basis for finding an appropriate separating technology of copper-nickel sulfide ore. The main contents of the research are as follows:The influencing factors of the floatation recovery for the superfine and refractory copper-nickel sulphide ore were analyzed by the technological mineralogy research. The research results show that copper-nickel mineral floatation is difficult because of complicated occurrence state, high oxidation level, complicated embedding feature of copper-nickel minerals, fine-grained dissemination and poor monomer dissociation; the whole floatation recovery is prevented by other factors, which includes lots of serpentine gangue minerals in the ore, inevitable ion such as Cu2+and Fe3+and other interference minerals such as pyrite and pyrrhotite.According to the research results of technical mineralogy, the detailed mineral processing research is conducted through three kinds of technology programs including "copper-nickel bulk floatation","copper-nickel preferential floatation" and "copper-nickel iso-flotability floatation" The results show that by using "copper-nickel bulk floatation" progress, copper-nickel separation is difficult, the grade of copper and nickel single concentrate is low and the quality is poor, and copper-nickel inter-inclusion is serious. The recovery of nickel concentrate is very low by "copper-nickel preferential floatation" process because nickel mineral is difficult to be activated after suppressed; comparing with the former two processes,"copper-nickel iso-flotability floatation" process can well avoid drawbacks of the difficulty of copper-nickel separation and nickel activation after suppressed, the grade and recovery of nickel signal concentrate is the highest, and the quality is the best, and it is a new. high-efficient, clean and harmonious mineral processing for the beneficiation recovery of superfine and refractory copper-nickel sulphide ore.The mechanism of surface adsorption for the new floatation process of superfine and refractory copper-nickel sulphide ore was studied by utilizing Infrared spectroscopy testing technology. The results show that new collector LP-01in the new process has obvious adsorption on the surface of chalcopyrite and the adsorption peak is the same with that of LP-01itself, while there is no obvious adsorption on the surface of pentlandite. It indicates that LP-01has good selective collectivity for chalcopyrite but poor for pentlandite and can realize the iso-flotability floatation of copper-nickel mineral.The electrochemistry behavior of the pentlandite surface oxidation was studied by using the principles of electrochemistry. The results show that production reaction of hydrophobic element sulphur can be carried out to realize self-induced floatation for pentlandite to some extent without the effect of collectors on a narrow potential interval of the acidic medium; while pentlandite has a certain floatability due to the production of dixanthogen on its surface with the effect of butyl xanthate. |
PDF Full Text Request