铅闪速熔炼过程的多相平衡模型

Multi-phase equilibrium model of lead flash smelting process

针对粗铅、铜锍、炉渣和烟气四相平衡体系,基于最小吉布斯自由能原理,采用元素势法,建立铅闪速熔炼多相平衡热力学模型。在与半工业试验相同炉料组成、熔炼温度、富氧浓度等操作条件下,模拟计算平衡组成。研究结果表明:粗铅中Pb质量分数绝对误差为0.30,相对误差仅为0.30%;炉渣中Pb,CaO和SiO2质量分数绝对误差分别为2.00,0.50和0.70,相对误差分别为6.67%,3.57%和3.89%,说明建立的模型能较好地反映铅闪速熔炼实际情况,为铅闪速熔炼过程的热力学研究提供了依据。

Based on the principle of Gibbs free energy minimization,a thermodynamic model of the lead flash smelting equilibrium system,including crude lead,matte,slag and gas four phases,was built using element potential method.The equilibrium composition was calculated at the same burden composition,smelting temperature and oxygen enrichment through the semi-industrial test.The results show that the absolute error of the percent content of Pb in crude lead is 0.30,and its relative error is 0.30%;the absolute errors of the mass fraction of Pb,CaO and SiO2 in slag are 2.00,0.50 and 0.70 respectively,and the relative errors of them are 6.67%,3.57% and 3.89%.It is proved that the model can wholly embody the lead flash smelting practice and can be applied to the thermodynamic research of the smelting process.