Hematite low temperature flotation agent and preparation method thereof

The invention relates to a hematite low temperature flotation agent and a preparation method thereof; the agent is the water solution of 2-hydroxyl-5-alkyl-sodium benzoic acid ammonium salt and sodium aliphatate in a ratio of 1:1-3 and the concentration of each solute is not less than 0.02mol/L. The preparation method comprises the following steps: preparing sodium aliphatate solution, preparing hematite collector 2-hydroxyl-5-alkyl-sodium benzoic acid ammonium salt solution, and then mixing the two solutions. The agent can be used for hematite roughing, the dosage is 0.01-0.18% of hematite and the flotation temperature is 20-30 DEG C. the preparation method of the invention has simple method, non-toxic and sate raw materials and stable chemical compositions and properties of the preparedflotation agent.