A new technology of one-step leaching of refractory gold concentrate containing arsenic and sulfur was studied and 96. 8% of gold was extracted in an hour by this technology. Themodynamic possibility of reactions of a...A new technology of one-step leaching of refractory gold concentrate containing arsenic and sulfur was studied and 96. 8% of gold was extracted in an hour by this technology. Themodynamic possibility of reactions of arsenopyrite. pyrite and gold with sodium hypochlorite in NaOH medium, and solution chemistry of H3AuO3 at different pH values were analyzed. The reason why the gold wrapped by FeAsS, FeS2 can be leached out rapidly by grnding of porcelain ball mill. is explained.展开更多
2009 was a relatively hard year for the pesticideindustry.China mule policy adjustmentson a large scale, and further policies favorableto farmers were put into effect, fhe indepthadjustment seems to provide growingpot...2009 was a relatively hard year for the pesticideindustry.China mule policy adjustmentson a large scale, and further policies favorableto farmers were put into effect, fhe indepthadjustment seems to provide growingpotential for a higher and stranger standardof living in the future.Viewing from the pastyear’s reforms, policies and ether changes inthe pesticide industry, it is apparent that competitivenesswill inereasingly rely on the technologicallevel and innovative capability ofthe enterprise.As Industry becomes more andmore concentrated, core enterprises becomefewer and fewer and various policies becomemore stringent, plenty of small, and mediumscale enterprises face increasing probabilityof elimination. - EDITOR’S展开更多
文摘A new technology of one-step leaching of refractory gold concentrate containing arsenic and sulfur was studied and 96. 8% of gold was extracted in an hour by this technology. Themodynamic possibility of reactions of arsenopyrite. pyrite and gold with sodium hypochlorite in NaOH medium, and solution chemistry of H3AuO3 at different pH values were analyzed. The reason why the gold wrapped by FeAsS, FeS2 can be leached out rapidly by grnding of porcelain ball mill. is explained.
文摘2009 was a relatively hard year for the pesticideindustry.China mule policy adjustmentson a large scale, and further policies favorableto farmers were put into effect, fhe indepthadjustment seems to provide growingpotential for a higher and stranger standardof living in the future.Viewing from the pastyear’s reforms, policies and ether changes inthe pesticide industry, it is apparent that competitivenesswill inereasingly rely on the technologicallevel and innovative capability ofthe enterprise.As Industry becomes more andmore concentrated, core enterprises becomefewer and fewer and various policies becomemore stringent, plenty of small, and mediumscale enterprises face increasing probabilityof elimination. - EDITOR’S
