Study On The Mineralogy Process And Flotation Basic Research Of Ni-Mo Tailings

Abstract:With demand of nickel and molybdenum continues to increase, how to develop the nickel-molybdenum ores, which is rich in precious metals, become a hot topic in the mining industry. The main problems of development and utilization of Ni-Mo ores are:the high cost of smelting and mineral processing will result in the loss of lots of metal. In this paper, the process mineralogy of Ni-Mo tailings is studied, as well as the influence of Ni-Mo tailings flotation by different adjustor and collector. The main conclusions are:(1) According to the phase analysis, nickel sulfide account97%of the total nickel, and63%of the total molybdenum is Molybdenum disulfide. Molybdenum minerals appear in the form of an amorphous colloidal, disorderly distributed in the ore, the main component include Mo and S; Most molybdenum minerals are very fine and intergrowth with or wrapped in other gangue minerals. Minority mineral monomer dissociation but the particle diameter is20microns. The majority of nickel exist in the mineral such as pentlandite、millerite、gersdorffite,a little part in the pyrite. A small amount of needle nickel ore exists in organic carbonaceous by the form of very fine colloidal.(2) the analysis of disseminated features and laser particle size of Nickel-molybdenum tailings shows that90%of the particle diameter smaller than54.021μm in the Ni-Mo tailings with no ultrasonic. Under the action of ultrasonic,90%of particle diameter smaller than43.149μm and50%particle size of less than9.965μm. The particle size of Ni-Mo tailings is very fine, and vision agglomeration is serious in the ore particles of Ni-Mo tailings pulp.(3) Comparison of nine different modifier on Ni-Mo tailings indicate that sodium carbonate have a great impact on the nickel-molybdenum tailings flotation, the taste first increased and then decreased with increasing sodium carbonate, recovery also showed an upward trend. (4) In comparison to behavior shows by different modified Ni-Mo tailings under the same kind of collector, the flotation result of lead nitrate modified Ni-Mo tailings was significantly better than the blank modification and calcium oxide modified Ni-Mo tailings, under the action of CPC, the grade of molybdenum, nickel of lead nitrate modified nickel-molybdenum tailings flotation concentrate are1.63%,1.63%, and recovery are44.23%,39.89%.(5) Molecular dynamics simulations show that:the adsorption energy between the collector particles and wulfenite is the lowest, which means that wulfenite would be first priority surfaced compare to other minerals. The results of adsorption energy between different collector particle and wulfenite indicates that the CPC cation adsorption energy is the biggest means that the selectivity of the the CPC to wulfenite is better than other collector particles.(6)Infrared spectroscopy shows that:dimethylglyoxime adsorption on the surface of the nickel sulfide in the form of chemical absorption. Sodium oleate, Benzohydroxamic acid and CPC can absorp in calcium molybdate surface, the first two is in the form of chemical adsorption, the adsorption of CPC in calcium molybdate surface is physical adsorption.