a gold mine concentrator has carried out a series of high-efficiency transformation for flotation operation, focusing on strengthening the recovery effect of coarse-grained minerals. At the same time, according to the optimization idea of "can collect and early collect", two concentrate output points are added in the middle link of flotation, which reduces the loss probability of useful minerals in flotation cycle. After the transformation and operation, the flotation recovery rate of the gold mine has increased by 1.34%, the annual gold output has increased by 52.86 kg, and the economic benefit has increased by 19.5574 million yuan.