Abstract: In order to improve the flotation separation of magnesite and quartz,the effect of organic modifier 2-dodecanone on the flotation separation of magnesite and quartz was investigated through single mineral flotation and artificial mixed ore flotation tests under the flotation system of dodecylamine collector. And the mechanism of action of 2-dodecanone was analyzed by combining the contact angle test,zeta potential analysis,infrared spectroscopy and X-ray photoelectron spectroscopy analysis. The results showed that 2-dodecanone adsorbs on the magnesite surface through electrostatic interactions,accompanied by a certain degree of chemical adsorption,which enhances the hydrophilicity of the magnesite surface and enlarges the hydrophobicity difference with quartz,and enhances magnesite surface positive electricity,which further hinders the adsorption of the collector dodecylamine and inhibits the effect on magnesite. 2-dodecanone has no obvious adsorption on the surface of quartz and has no effect on the adsorption of dodecylamine,which can realize the high-efficiency flotation separation of magnesite and quartz.

Key words: modifier 2-dodecanone,magnesite,quartz,selective inhibition