Research On Optimization Of Flotation Of A Lead-zinc Sulfide Mine In Guangxi

With the annual mining of the lead-zinc sulfide mineral resources,it is facing many serious problems of increasingly poor,fine and miscellaneous.As the ore is mined year after year,the selected grade is decreasing year by year,and the original process and reagent system of the concentrator have not been able to obtain high-quality products.Therefore,the high-efficiency separation of lead-zinc ore is particularly important.How to optimize production indicators and maximize resource utilization through the use of new pharmaceutical agents and appropriate pharmaceutical systems under the original process and equipment conditions is the simplest and most feasible method at present.This paper take a lead-zinc sulfide mine in Guangxi as the research object.The production index of the concentrator has the problems of low concentrate grade and metal recovery rate and high mutual content of lead and zinc concentrate.It is known that the concentrator uses copper sulfate as the activator of sphalerite.However,the disadvantage of copper sulfate is that the selectivity of the activation is not strong and need to be used under high alkali conditions,which will have a great impact on the beneficiation index and the efficiency of the concentrator.The new activator X-45 of sphalerite,independently developed by Professor Tong Xiong's research group,has better activation ability and selection performance than copper sulfate on the one hand,and lower cost and wider pH environment on the other hand.This paper discusses whether the new activator X-45 can replace copper sulfate,achieve the goal of improving the concentrate grade and metal recovery rate of the concentrator,reducing the mutual inclusion of lead and zinc in concentrates,reducing beneficiation costs and improving economic benefits.The paper conducts process mineralogy analysis of mineral samples,such as chemical multi-element analysis,X-ray fluorescence spectrometry,scanning electron microscopy,XRD diffraction analysis,phase analysis and other detection methods.The analysis results show that 68.13% of the lead in the ore is contained in the galena,and 88.52% of the zinc is contained in the sphalerite.The lead grade is 0.86%,the zinc grade is 3.86% in the ore,and the gangue minerals are mainly barite,quartz,dolomite.The galena and sphalerite have complex embedding characteristics,wide particle size distribution and uneven thickness with the gangue minerals.The preferential flotation process is selected to conduct the flotation test study on the ore from Guangxi.The test results were obtained,the closed-circuit test yielded lead concentrates with average grade and recovery of 34.02% and 56.67%,including 12.33% of zinc,and 45.91% and 90.99% of zinc concentrate,which contains 1.86% lead,under the conditions of the optimal pharmaceutical system with the new activator X-45.Compared with copper sulfate,not only the optimum amount of zinc-selected lime is reduced by 200g/t,but the zinc grade in zinc concentrate is increased by 3.11%,the zinc recovery rate is increased by 2.56%,and the lead content of zinc concentrate is reduced by 0.06%.From the economic budget,the use of new activator X-45 can save 0.25 yuan per ton of chemical cost per ton,and increase the comprehensive economic benefit of 36.92 yuan per ton of raw ore.Under the optimal pharmaceutical system conditions,the results of pure mineral flotation experiments under the action of two activators are obtained: the new activator X-45 has stronger activation ability and more selective activation,and its applicable solution pH environment is wider.Comparing the contact angle of sphalerite surface under the action of two activators,the activation ability of the new activator X-45 is stronger than that of copper sulfate.