| For the associated complex lead-zinc ore,the process flow of comminuting–flotation has already been widely used in industrial production.At present,the requirement of flotation of grinding fineness is -74?m,which is accounting for about 70%,but the nature of sulfide ore is brittle,for the coarser grain size,part of the sulfide ore has been separated already,however,there still a need for further grinding to meet the requirements of flotation particle size,it not only causes unnecessary grinding energy consumption but also tends to causes over-grinding,which affects the flotation index.Therefore,If the upper limit of particle size of ore separation can be increased,the flotation of lead-zinc ore in coarse grade can be realized,it is of great significance not only to relieve grinding pressure,save energy and reduce consumption,it can also reduce phenomenon of mineral over-grinding and improve the separation effect.For this reason,introducing hydraulic flotation equipment,putting forward the thought that classification-rougher flotation-pre-removal of tailings prior,get rid of the limit of size classification technology on size,increasing the upper limit of mineral classification from 104?m to 535?m,explore and study the technology of combined separation process of graded pre-throwing tails.The raw ore is analyzed by related process mineralogy,the results show that,there is high grade of lead zinc in ore,6.55%and 24.73%,respectively,mainly occurring in sulfide ore.Scanning electron microscope results showed that at-74?m,most of the sphalerite has been liberated,galena and a small part of sphalerite can only be liberated at-45?m.Besides,using microscope to observe coarse-grained minerals(+104?m):under this grain size,the occurrence rate of interlocked minerals was 57.83%,lead-zinc monomer dissociation 20.25%,If can flotation lead-zinc ore and interlocked minerals without entering the mill,realizing the pre-removal of tailings,thus,the grinding amount can be reduced and the energy consumption of grinding can be reduced.The minerals are graded,coarse-grained minerals were tested by hydraulic flotation machine,after a grinding,the concentrate of hydraulic flotation is mixed with the fine grade raw ore,carrying out the follow-up selection work.Under the optimum experimental conditions,carrying out closed circuit test,obtain lead concentrate with grade of 66.31%and recovery of 85.59%and zinc concentrate with grade of 59.05%and recovery of 94.70%.Compared with the experimental results that using original process for grading,the dosage of reagents of combined flowsheet has increasing,but at the same time,the recovery of zinc was also reduced by 0.37%,lead grade increased by 1.54%,recovery rate increased by 1.17%,Zinc grade increased by 4.03%.The economic estimates assume the treatment of the plan is 1000 tons of raw ore every day,using Bond empirical formula to analyze and calculate the grinding energy consumption,the result shows that the energy consumption of grinding can be reduced by 617.69W_i kW·h per day.Meanwhile,the combined flowsheet can increase benefit by 38050 yuan per day.The introduction of hydraulic flotation machine reduces the energy consumption of grinding and improve the product index,as well as provides a new research idea for process design,equipment innovation and reducing energy consumption of grinding plant in the future. |
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