Beneficiation reagent for flotation of niobium from niobite and preparation method of beneficiation reagent

The beneficiation reagent is prepared from the following ingredients in parts by weight: 20 to 30 parts of ethyl propyl phosphate, 20 to 25 parts of sodium carbonate, 20 to 30 parts of sodium phosphide, 35 to 45 parts of 2, 3-dimethyl butyric acid, 15 to 23 parts of phosphorus, 10 to 25 parts of hydroxyisobutyl ethylene, 35 to 50 parts of 3-amino-2-pentenoic acid, 4 to 5 parts of quick lime and 12 to 15 parts of activating agents. The preparation method comprises the following steps: firstly, preparing ethyl propyl phosphate, sodium carbonate and phosphorus into an oily solution A, then adding sodium phosphide, 2, 3-dimethyl butyric acid and hydroxyisobutyl ethylene into the solution A, stirring and reacting to obtain a solution B, adding 3-amino-2-pentenoic acid, quick lime and an activating agent into the solution B, stirring, reacting and filtering to obtain a filtrate C, and finally adding sodium carbonate and phosphorus into the filtrate C to obtain a finished product. And evaporating, cooling and carryi