Highly efficient removal of impurity Bi element from scrap brass can facilitate the recycling process of brass.The effects of melting temperature,holding time and Mg-Ca alloy content on the removal effect of impurity ...Highly efficient removal of impurity Bi element from scrap brass can facilitate the recycling process of brass.The effects of melting temperature,holding time and Mg-Ca alloy content on the removal effect of impurity Bi element were investigated by compound-separation method.The mechanism of the compound-separation method was revealed for removing the Bi element from a thermodynamic point of view.The results showed that the Bi content was decreased from 1.95 wt.%to 0.178 wt.%at the optimum process parameters of melting temperature of 980°C,holding time of 20 min,and Mg-Ca alloy content of 6 wt.%,achieving a removal rate of 90.9%.A small amount of Ca-Bi compound remained in the brass matrix after refining.NaF flux can effectively wet and adsorb Ca-Bi compounds due to its low viscosity and the function of lowering the surface tension,which facilitate the agglomeration and flotation of Ca-Bi compounds to the melt surface,thereby ensuring the sufficient removal of Bi element.展开更多
基金the financial supplies supported by the National Natural Science Foundation of China(Nos.U2202255,52371038)the Science and Technology Innovation Program of Hunan Province,China(No.2023RC1019)。
文摘Highly efficient removal of impurity Bi element from scrap brass can facilitate the recycling process of brass.The effects of melting temperature,holding time and Mg-Ca alloy content on the removal effect of impurity Bi element were investigated by compound-separation method.The mechanism of the compound-separation method was revealed for removing the Bi element from a thermodynamic point of view.The results showed that the Bi content was decreased from 1.95 wt.%to 0.178 wt.%at the optimum process parameters of melting temperature of 980°C,holding time of 20 min,and Mg-Ca alloy content of 6 wt.%,achieving a removal rate of 90.9%.A small amount of Ca-Bi compound remained in the brass matrix after refining.NaF flux can effectively wet and adsorb Ca-Bi compounds due to its low viscosity and the function of lowering the surface tension,which facilitate the agglomeration and flotation of Ca-Bi compounds to the melt surface,thereby ensuring the sufficient removal of Bi element.
