Beneficiation method for recycling bismuth from molybdenum selecting tailings

A beneficiation method for recycling bismuth from molybdenum selecting tailings is characterized by including the following steps that grout is mixed, in the step, concentrated sulfuric acid is added into the molybdenum selecting tailings; flotation roughing is performed, in the step, activator lead nitrate, collecting agent butyl xanthate and foaming agent terpenic oil are added to perform primary roughing to obtain roughed concentrate and roughed tailings; floating scavenging is performed, in the step, the butyl xanthate and the foaming agent terpenic oil are added in the primary scavenging of the roughed tailings, and the butyl xanthate and the foaming agent terpenic oil are added in the secondary scavenging or blank scavenging is performed to obtain scavenged concentrate and flotation tailings; flotation fine selection is performed, in the step, three to four times of blank fine selection is performed on the roughed concentrate to obtain bismuth concentrate and fine selected tailings; the fine selected tailings and the scavenged concentrate are made to return to the flotation roughing operation. According to the beneficiation method, bismuth is recycled from the molybdenum selecting tailings under the faintly acid condition in order to solve the problems that under the alkaline condition, activation of bismuthinite is poor and the recycling efficiency is low. According to the method, the recycling rate of the bismuth is larger than 85%, the Bi content in the bismuth concentrate is larger than 20%, and the method is applicable to molybdenum ore mines containing bismuth.