Ilmenite floatation collecting agent, and preparation method and application thereof

The invention relates to an ilmenite floatation collecting agent, and a preparation method and application thereof. The collecting agent is prepared by performing reaction on cottonseed oil waste, mixed fatty acid, triethylene-tetramine hexmethanephonic acid, higher fatty hydroximic acid and strong alkali in a high-pressure reaction kettle for 2 to 5 hours at the temperature of 140 to 180 DEG C, wherein the weight ratio of the cottonseed oil waste, the mixed fatty acid, the triethylene-tetramine hexmethanephonic acid, the higher fatty hydroximic acid and the strong alkali is (2-4.5):(3-5):(0.2-0.5):(0.2-0.5):(1-2). When the collecting agent provided by the invention is used for floatation, rough floatation is conducted at first and then concentration is conducted twice. The higher fatty hydroximic acid, which is one of the raw materials, is a good metal complexing agent and enhances the complexing ability with Ti4+ plasma to enable the Ti4+ plasma to form a stable complex, so that ilmenite ore can be floated effectively; in addition, the mixed fatty acid has high foamability after being chemically modified, so an extra foaming agent is not needed. The collecting agent provided by the invention has the advantages of high normal-temperature selectivity, high dispersibility, small reagent dosage, high mineral separation comprehensive efficiency and the like, is suitable for floatation production of various kinds of ilmenite, and has very important significance to promote the development of ilmenite beneficiation.