Preparation method and application of silica-calcia collophanite reverse flotation inhibitor

The invention discloses a preparation method and application of a silica-calcia collophanite reverse flotation inhibitor. The collophanite inhibitor is prepared from organic acid, inorganic salt, organic salt and a high-molecular compound according to the mass ratio of (38-52): (26-36): (15-23): (23-30). The reverse flotation application comprises the following steps that the prepared inhibitor, the desilicication collecting agent and the decalcification collecting agent are sequentially added into phosphoric ore pulp, primary reverse flotation is carried out, and in-tank concentrate products and foam tailing products are obtained. The method is applied to silicon-calcium phosphorite collophanite reverse flotation, the problems of pipeline scaling, equipment corrosion and acid wastewater treatment caused by traditional inhibitors of phosphoric acid and sulfuric acid are solved, the chemical cost is reduced, meanwhile, the flotation control process is simplified, and the separation efficiency and the phosphoru