Behavior of surface action between ethyl thiourea and chalcopyrite

The behavior of surface action between ethyl thiourea (ETU) and chalcopyrite was studied by means of measurement of adsorptive amount, IR and XPS. The adsorption behavior of ETU on chalcopyrite corresponds to Freundlich adsorption isothermal equation, which is Г =6.31×10 -5 c 0.31 mol/g. The adsorption is a covalent bond type of chemical one composed of two σ type bonds and a back donation π type, mainly occurs between sulfur and nitrogen atom in ETU and copper atoms on the surface of chalcopyrite. For the two σ type bonds, one is formed by transferring a pair of electrons from sulfur atom in ETU to copper atoms on the surface of chalcopyrite, the other is from nitrogen atom. And the π type bond is caused by transfer of electrons from copper atoms on the surface of chalcopyrite to unoccupied π type orbit of CS group in ETU. Theoretical index predicts that ETU can be an excellent kind of chelating collector for copper flotation. [

The behavior of surface action between ethyl thiourea (ETU) and chalcopyrite was studied by means of measurement of adsorptive amount, IR and XPS. The adsorption behavior of ETU on chalcopyrite corresponds to Freundlich adsorption isothermal equation, which is Gamma=6.31x10(-5) c(0.31) mol/g. The adsorption is a covalent bond type of chemical one composed of two sigma-type bonds and a back donation pi-type, mainly occurs between sulfur and nitrogen atom in ETU and copper atoms on the surface bf chalcopyrite. For the two sigma-type bonds, one is formed by transferring a pair of electrons from sulfur atom in ETU to copper atoms on the surface of chalcopyrite, the other is from nitrogen atom. And the pi-type bond is caused by transfer of electrons from copper atoms on the surface of chalcopyrite to unoccupied pi-type orbit of C=S group in ETU. Theoretical index predicts that ETU can be an excellent kind of chelating collector for copper flotation.