Applied thermodynamics software FactSage

the removal of lead from the scrap brass was simulated by adding Mg-30 Ca alloy

and its thermodynamics of element reactions was analyzed theoretically.Thermodynamic calculation reveals that solid-liquid phase temperature of the scrap leaded brass reaches 824

8

56 ℃.After adding Mg-30 Ca alloy

high melting point CaPb

Ca2 Pb compounds can be observed in the alloy.With increasing in Mg-30 Ca alloy addition in range of 1%

2

%

CaPb and Ca2 Pb compounds are increased

which can improve effectively deleading efficiency.With 7% Ca-Mg alloy addition at 880 ℃

the deleading efficiency can reach up to 99.6%.Deleading efficiency is decreased with increasing in temperature.Deleading process is consistent with the thermal-dynamics balance process

so increase of temperature is harmful for the deleading in lead brass.The trial-production is well agreement with the simulated ones.