Floating sulfur collecting agent and method for reducing sulfur in iron ore concentrate through flotation

The invention discloses a floating sulfur collecting agent and a method for reducing the sulfur in iron ore concentrate through flotation. The floating sulfur collecting agent consists of amyl potassium xanthate and N,N-diethyl sulfo-amino sodium formate in a mass ratio of 1-3:1. The method for reducing the sulfur in the iron ore concentrate through flotation by using the floating sulfur collecting agent comprises the following steps of: adding regulators into low intensity magnetic separation iron ore concentrate pulp so as to adjust the pH value, further adding the floating sulfur collecting agent provided by the invention, and carrying out the primary rough separation and the primary fine separation, wherein pyrrhotite with better dissociation can be floated in the rough separation, pyrrhotite coenobium can be further floated in the fine separation, the sulfur content in the iron ore concentrate obtained after the fine separation can be less than 0.1%, and the iron loss can be less than 5%. The method for reducing the sulfur in the iron ore concentrate through flotation is simple in steps and is strong in operability as only the floatation working needs to be added, and the sulfur can be reduced to 0.1% under the condition that the sulfur content in feeding is as high as 1%, so that the requirements of large steel companies for the raw materials are met, and the overall quality of steel materials is improved.