Swill-cooked dirty oil collophanite reverse flotation collecting agent and preparing method thereof

The invention relates to a swill-cooked dirty oil collophanite reverse flotation collecting agent and a preparing method thereof. The collecting agent comprises, by mass, 90-100 parts of swill-cooked dirty oil fatty acid, 10-20 parts of sodium hydroxide, 5-15 parts of OP-10 and 60-80 parts of water. The preparing method of the collecting agent includes the steps that a sodium hydroxide solution is added into the swill-cooked dirty oil fatty acid for saponification, and a mixture of fatty acid soap and incomplete reaction fatty acid is obtained; water is added to a surface active agent, and the surface active agent with the water is heated and evenly scattered to be added into the mixture of the fatty acid soap and the incomplete reaction fatty acid according to different proportions, sufficient heating is carried out for even stirring, and the reverse flotation collecting agent is obtained after emulsification is complete; the solubleness and the dispersity of the collecting agent in water are good, the selectivity is good, the collecting capacity is high, the preparing process is simple and rapid, carbonate minerals can be effectively removed at a normal temperature, the phosphorus concentrate grade is improved, and efficient normal temperature reverse flotation of collophanite is achieved.