Agent and method for improving recovery rate of slag-selection copper concentrate

The invention discloses a novel agent and method for improving the recovery rate of slag-selection copper concentrate. According to the technical scheme, the method for improving the recovery rate ofthe slag-selection copper concentrate comprises the steps that ore grinding pulp enters a first-stage rough concentration stirring barrel, N-allyl-O-isobutyl thiocarbamate and a foaming agent are added for floatation, part of qualified copper concentrates are selected, first-stage flotation tailings are subjected to second-stage ore grinding and then enter a second-stage stirring tank, N-allyl-O-isobutyl thiocarbamate and a foaming agent are added, and the mixture is subjected to one-time rough concentration, at least one-time fine selection and at least one-time scavenging flotation process,fine-selected concentrates and final tailings are obtained, the fine-selected concentrates and the part of copper concentrates obtained by first flotation are combined into the final copper concentrates, the fine-selected tail