Application Research of a Novel Dithiophosphate in a Copper-Lead-Zinc Polymetallic Sulfide Ore
Copper,lead and zinc polymetallic sulfide ore was easy to float and difficult to separate due to similar floatability,unavoidable ion activation,fine distribution and other problems,and often associated with precious metals,and its comprehensive recovery had been a technical problem in mineral processing.Dithiophosphate was widely used in flotation of copper,lead and zinc sulfide ores because of its good selectivity in low alkali pulp environment.The main collectors of dithiophosphate used in flotation production were butylamine dithiophosphate and dimethylphenyl dithiophosphate,which had the weak collection ability and are difficult to meet the increasingly complex ore properties.The main metal copper,lead and zinc grades in a polymetallic sulfide ore in Inner Mongolia were 0.30%,2.13%and 2.89%,respectively,and the associated silver grade was 60.75 g/t.Through comparing modified dithiophosphate(LS-701),dimethylphenyl dithiophosphate,butylamine dithiophosphate,ethyl xanthate and diethyl dithocarbamate,it was found that LS-701 showed a stronger ability to collect fine silver galena in low alkali pulp environment under the premise of ensuring selectivity.Copper,lead and silver can be recovered well in co-flotation with O-isopropyl-N-ethyl thionocarbamate.For copper-lead bulk concentrate obtained by regrinding and recleaning,the combination of ammonium persulfate and sodium humate as inhibitors(the mass concentration ratio is 1∶2),Z-200 as collector to suppress lead floating copper,the separation effect was remarkable.In zinc operation,the conventional flotation process was adopted,with lime as pyrite inhibitor,copper sulfate as activator and butyl xanthate as collector.Through the flotation process"copper-lead bulk flotation-rough concentrate regrinding-copper-lead separation-zinc beneficiation",a copper concentrate was obtained with the grade of 21.59%Cu and the recovery of 65.60%,a lead concentrate was obtained with the grade of 69.10%Pb and the recovery of 92.12%and a zinc concentrate was obtained with the grade of 51.06%Zn and the recovery of 90.54%.The total recovery of silver in copper concentrate and lead concentrate was 75.48%.An efficiently comprehensive utilization of valuable metals copper,lead,zinc and silver was achieved.
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