Activity of lead in copper matte at very low lead concentration
作者单位：CSIRO Minerals Down Under Flagship CSIRO Process Science and EngineeringBayview AveClaytonVic 3169Australia
会议名称：《Ninth International Conference on Molten Slags,Fluxes and Salts(MOLTEN12)》
会议日期：2012年
学科分类：080603[工学-有色金属冶金] 08[工学] 0806[工学-冶金工程]
基 金：the financial support of the CSIRO Minerals Down Under National Research Flagship
关 键 词：copper matte transportation thermodynamics lead activity
摘 要：The thermodynamic behavior of lead in Cu-Fe matte was investigated using a transportation technique where argon gas was bubbled into a bath of copper matte containing approximately 100 ppm lead at temperatures between 1300 and 1400°*** effect of flow rate,temperature and matte grade were investigated on the lead transport from a bath containing 100 grams of synthetic copper matte to the gas *** concentration of lead in the bath was followed with *** argon flow rates between 3 l h-1 and 18 l h-1,it was observed that the concentration change of lead in the matte was found to follow a first order relationship where the calculated concentration at time t,is of the form:[Pb ]= a.e-b.t where a is equal to the initial lead content in ppm,[Pb ] i,and b is an exponential term and t is time in *** partial pressure of lead species in the gas phase was calculated from the concentration changes in the matte and from the bubbling gas *** gas flow rates between 3 and 9 l h-1,the lead removal appeared to be under equilibrium *** higher gas flow rates,the apparent rate decreased,mainly due to splashing of matte into the cold zone of the *** these experiments with Ar as the carrier gas,the sulphur and oxygen partial pressures of the melt were not *** analysis of the major components in the matte showed only random variation with bubbling time,and so a thermodynamic solution model for copper matte was used to calculate the equilibrium sulphur pressure *** this approach the proportion of Pb,PbS and Pb 2 species in the gas could be calculated knowing the relevant reaction constants,e.g.:PbS（g） = Pb（g） + S 2（g） From the proportions of the lead species in the gas,the value of the lead activity coefficient with respect to the gas state could be *** a 50% copper matte,it was found that the activity coefficient increased with temperature,from a value of 0.8 at 1300°C to 1.4 at 1400°*** the white metal composition,