| The separation of copper and molybdenum is one of the problems of flotation,especially molybdenum concentrate tailings.There are lots of barriers which is containing a small amount of copper,small difference in floatability of copper and molybdenum low grade fine particle size and the residual reagent affected in flotation separation.These problems make the high content of copper and molybdenum.And it is not conducive to the efficient recycling of resources.The thesis takes Xiaomiaoling Molybdenum Select Tailings in Luanchuan as the research object,proposes superconducting magnetic separation to achieve copper and molybdenum separation,and then conducts copper and molybdenum flotation on superconducting magnetic separation products separately.And a series of experimental studies were carried out.The purpose of this method is to provide new ideas for improving the utilization rate of copper and molybdenum resources and expand the application field of superconducting magnetic separation.Through superconducting magnetic separation and separation experiments of molybdenum tailings,the conditions such as the amount of de-reagent,background magnetic field strength,type of magnetic medium,ratio of composite magnetic medium,amount of dispersant,concentration of feed slurry,etc.were optimized.Under the background magnetic field strength 4 T,the flow rate of flushing water in the field is 22 L/min,the amount of sodium hexametaphosphate is 300 g/t,the ratio of composite magnetic medium(1.9×2 mm:1 mm diamond)is 1:1 and 20%slurry concentration conditions,the result shows that the 0.13%molybdenum grade and0.17%copper grade primary ore with one superconducting magnetic separation,a good separation index can be obtained.Among them,non-magnetic products have a copper grade of 0.04%,molybdenum grade of 0.15%,copper recovery rate of 15.35%,molybdenum recovery rate of 77.71%;magnetic products copper grade of 0.45%,molybdenum grade of 0.09%,copper recovery of 84.65%,recovery of molybdenum of 22.29%.Further,the superconducting magnetic separation products were subjected to molybdenum flotation and copper flotation tests respectively.The slurry p H,dispersant dosage,collector dosage and ratio,foaming agent dosage,slurry concentration,flotation time,times of the fine sweep has been optimized.The results show that for non-magnetic products,in the slurry p H=7,the total amount of kerosene and butyl xanthate is 300 g/t and the ratio is 2:1,2~#oil 45 g/t,slurry concentration 20%,flotation time 5min,after one coarse five fine three sweep open flotation,molybdenum concentrate molybdenum grade 38.05%,recovery rate 40.28%,copper grade 0.19%;for magnetic products,under the condition of pulp p H=9,water glass100 g/t,copper sulfate 50 g/t,butyl yellow medicine 400 g/t,2~#oil 30 g/t,pulp concentration 20%,flotation time 5min After one rough,four fine and four sweep open flotation,a good indicator of copper concentrate grade 20.13%and recovery42.17%.On the basis of the above research,superconducting magnetic separation continuous separation-copper-molybdenum separate flotation closed circuit test was carried out.After superconducting once separation,non-magnetic products one coarse five coarse four sweep and magnetic products one coarse four fine four sweep closed circuit test,Without the use of inhibitors,molybdenum concentrate with a molybdenum grade 35.40%,a recovery rate of 89.64%,a copper grade 0.36%,and a copper grade 18.16%with a copper grade 88.73%.Through the numerical quality process,the total molybdenum recovery rate is 70.35%,and the total copper recovery rate is 78.72%.The paper contains 46 figures,18 tables,and 127 references. |
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