High-arsenic-tin polymetallic ore coarse grain grinding separation branch enrichment method

A high-arsenic-tin polymetallic ore coarse grain grinding separation branch enrichment method comprises the following steps that (1) an ore grinding particle size test and an ore grinding medium test are conducted, the final ore grinding particle size, a proper ore grinding mode and an ore grinding medium are determined, the gravity separation process is table enrichment-table floating tin collection, the floating weight process is flotation desulfurization-table tin collection, and the flotation separation process is flotation desulfurization-table tin collection; floating middlings are ground to 1 mm or 0.5 mm through a rod mill, and tin is recovered through single floating; and (2) setting a recovery process of'screw slipping-flotation front-section tin reselection ', and feeding ore grinding classification returned sand into a process system for sorting to form an ore grinding sorting major cycle. Therefore, the problems that cassiterite is hard to collect due to over-grinding, sulphide ore is hard to flo