Collophanite reverse flotation process applied to yield improvement

The invention discloses a collophanite reverse flotation process applied to yield improvement, which comprises the following steps: sequentially adding a flotation reagent into phosphoric ore pulp, introducing into roughing operation, roughing to obtain rough concentrate and a foam product I, supplementing a regulator into the foam product I, introducing into first-stage scavenging to obtain scavenged concentrate I and a foam product II, and carrying out second-stage scavenging on the scavenged concentrate I and the foam product II; after a flotation reagent is supplemented to the scavenged concentrate, re-separation is conducted, re-separation concentrate and a foam product III are obtained, the re-separation concentrate and the rough concentrate are mixed, the flotation reagent is added, concentration is conducted, final concentrate and a foam product IV are obtained, and the foam product IV is returned to roughing operation; and the foam product III and the foam product II are mixed and then subjected to s