Evaluation of Heterogenous Oxidation Reaction of Copper Concentrate/ Silica Sand Mixture by Dropping Method

Abstract

PDF in Japanese. Mixts. of copper conc. and silica sand with various CuFeS2/ FeS2ratios and with 5 mg in wt. were dropped from the top side of the silica tube filled with O2 gas and were reacted at 470°C. The Fe / SiO2 mass ratio of the matrix was fixed at 1.1 as a typical compn. of flash smelting. The samples exhibited the white light emission expecting the arrival temp. of > 1500°C due to the ignition reaction of sulfide minerals. Reaction products were evaluated by using scanning electron micrograph-energy dispersive X-ray spectrometry (SEM-EDS) anal. In addn. to un-reacted oxide and sulfide particles, matte-slag-mineral-magnetite coexisted particles were recognized in microstructure observation. The products supported heterogeneous reactions occurring in the copper conc. burner. The effect of FeS2 concn. on copper concn. in matte phase and magnetite phase fraction in slag phase was discussed. [on SciFinder(R)]