Flotation separation method for high-calcium fluorite mine

The invention discloses a flotation separation method for a high-calcium fluorite mine, and particularly relates to a beneficiation method for the fluorite mine with high calcium carbonate content (containing 30-70% of CaCO3). Comprising the following steps: (1) ore grinding; (2) performing fluorite roughing on ore pulp produced by ore grinding to obtain fluorite rough concentrate; (3) performing concentration on the fluorite rough concentrate for 6-7 times; (4) scavenging is conducted on tailings obtained after fluorite roughing for 1-3 times; (4) sequentially returning scavenged concentrates and concentrated middlings; and (5) adding different types of inhibitors in sections. The sodium silicate, the iron-chromium lignin and the carboxymethyl starch are used as calcium carbonate combined inhibitors, and the selective inhibition performance of the agents on calcium carbonate minerals is enhanced by utilizing the synergistic effect of the combined agents, so that the purposes of effectively inhibiting calcium