Method for separating roasted iron core and jade in floatation mode through cation combined collecting agents

Provided is a method for separating roasted iron ore and jade in floatation mode through cation combined collecting agents. The mass formula of the cation combined collecting agents is that alkyl polyamines ether: acetic acid: ester=100:(5-20):(5-20), wherein the alkyl polyamines ether is the main body of the cation combined collecting agents, the acetic acid serves as solubilizer, and the ester serves as auxiliary collecting agent and foam controlling agent. The combined collecting agents is matched with starch serving as inhibitor of iron ore, primary flotation is carried out for mixture ore prepared by roasted iron ore purified ore (TFe with 66.25wt.%) of the Jiuquan iron and steel group limited company and jade in proportion of 80:20, fine ore yield is 77.05%, iron grade is 62.31 wt.%, and recovery rate is 90.24%. The combined collecting agents are used for flotation of magnetic fine ore practical minerals of the roasted iron ore of the Jiuquan iron and steel group limited company, the starch is added to