| Minerals in Cu-Pb-Zn multi metal complex ore are always closely coexisting with each other. This feature makes the valuable single mineral difficult to liberate that different minerals are difficult to be separated.Another reason for the bad mineral processing effect is typically the inadvertent activation of sphalerite or pyrite by the heavy metal ions in solution, so this ore is very hard to separate. This paper’s research object is Cu-Pb-Zn multi metal complex ore. On the reasonable development and utilization of multi metal ore, there is a certain guiding significance for the experimental research.The ore studied in this paper is from Mandalay in the central part of Myanmar, belonging to sulfide-oxidized Cu-Pb-Zn mixed ore. The grade of copper, lead and zinc in run-of-mine was respectively0.304%,3.97%and3.37%, and the associated element Ag had a grade of91g/t. Except for copper, lead, zinc, and Ag, other elements have no comprehensive utilization value for that the content is too low. The grade of harmful elements is low that they won’t affect the concentrate index. The oxidation rate of copper and lead is high with the copper40.10%and the lead47.61%. Most of zinc exists in zinc sulfide with only10.04%oxidation rate. The results of the process mineralogy research showed that the mainly mineral of copper was chalcopyrite, the mainly minerals of lead included galena, cerussite, anglesite and plumbojarosite, and the mainly mineral of zinc was sphalerite. The mainly gangue minerals are quartz, feldspar and mica etc. The dissemination size was fine between the valuable minerals and the symbiosis relationship was complex between copper, lead and zinc, therefore, the separation was difficult. The ore which has a loose crumb structure is very apt to be slimed so as to produce amount of secondary slime which can seriously affect the flotation. Lead in the ore was distributed unevenly and regional segregation was existed, so it was difficult to make use of lead oxides.On the basis of process mineralogy research, the plan was determined that "copper lead mixed flotation-zinc flotation-lead oxide flotation from tailing and copper lead concentrate regrinding flotation separation" after exploring the basic flowsheets. The optimal reagent system was obtained by the optimization of experimental condition tests, and then determined the concentrating and scavenging times of each flotation test by open circuit tests. The closed circuit tests obtained four products, and copper had a grade of17.85%, grading silver839g/t in copper concentrate. The lead had a grade of53.90%, and the grade of silver was1050g/t in lead sulfide concentrate. The zinc concentrate had a grade of49.58%and recovery of80.26%. The lead oxide had a grade of48.57%and recovery of41.33%.The desired effect was obtained after exploring the effects of three dosages on separation index, with zinc sulfate, sodium sulfite and sodium sulfide as combined inhibitor. In the flotation of copper and lead separation, using the process of mixed concentrate regrinding, finally a good separation index was obtained and the amount of potassium dichromate reduced in a certain extent,with potassium dichromate and sodium sulfide as inhibition combination reagents of galena. Using the sulfide-flotation process to reduce the loss of lead metal for existing mudding phenomena, the total recovery of lead was87.7%. |
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