Migration And Transformation Of Xanthate In The Course Of Reagent-removal For Copper Concentrate Containing Molybdenum

Bulk flotation-separation of chalcopyrite and molybdenite was mostly common in the treatment of copper and molybdenum sulfide ores.Reagent-removal played an essential role in the flowsheet.Determination of adsorbance, infrared spectroscopy study and flotation solution chemistry calculation in butyl xanthate-chalcopyrite system indicated markedly complex mineral-solution-reagent interaction. In the case of separation between chalcopyrite and molybdenite, understanding of adsorption and desorption behavior of reagent under various physic-chemical conditions become important for developing schemes of processing them.A modified ultraviolet-visible spectrophotometry method was proposed to determine the content of infinitesimal xanthate adsorbed onto the surfaces of chalcopyrite, i.e. desorb the xanthate by Na2S firstly,followed by the measurement of ultraviolet-visible spectrophotometry method;Mono-mineral tests have been used to identify the desorption behavior of xanthate on the surface of chalcopyrite.The effect of reagent-removal varied in the techniques involved in this paper. They could be ranked as Na2S (93.13%), heating-up (67.06%), pH (63.89%), KMnO4 (49.33%), Ca(ClO)2 (39.53%), ultrasonic wave (36.76%), H2O2 (15.65%) according to the decrease of their respective maximum desorption rate;The mechanisms of the desorption behavior were investigated through infrared spectroscopy and ultraviolet spectrophotometry. The infrared spectroscopy tests confirmed copper butyl xanthate was the final interaction product of chalcopyrite and butyl xanthate. The characteristic band of Cu-0 and Cu=O were found on the copper butyl xanthate oxidized by KMnO4, Ca(ClO)2 and H2O2,which indicated the existence of basic copper compound as CuO and CuS. Copper butyl xanthate was reduced to ROH and CS2 in acidic solution, while in alkaline condition, xanthate ion may be replaced by OH- according to the competitive adsorption rule. The result of flotation solution chemistry calculation illustrated HS" was the useful constituent of ,which obeyed the same rule of OH-;Practical ore (from Jiama,Tibet) flotation were carried out to evaluate the achievement above. The results showed heating-up outstood among the varied techniques. Favourable concentrate whose molybdenum grade is 5.59% and copper grade is 22.98% was acquired when the bulk concentrate was preheated for 10min at a temperature of 175??...