在有或无乙基钾黄药存在情况下,对PbS-、Cu_2S-和Fe_2S-H_2O体系进行了综合性热力学计算。特别注意了根据计算结果制做Eh—PH图和确定金属黄原酸盐或双黄药稳定存在的条件。计算以质量平衡为基础,所以能够确定在不同条件下所生成的金属黄原酸盐或双黄药的量。据此能够预计浮选最佳条件,并将其与实验中获得的浮选数据相比较。为了弄清楚亚稳态物种在浮选中的作用,在pH=9.2时,对方铅矿和辉铜矿电极进行了伏安实验和间歇恒电流脉冲极化实验。在实验结果的基础上,讨论了可能的反应机理,并与热力学预计结果进行了比较。 In the presence or absence of ethyl potassium xanthate, a comprehensive thermodynamic calculation of PbS-, Cu 2 S- and Fe 2 S-H 2 O systems was performed. Special attention was paid to making the Eh-PH diagram based on the calculation and to confirm the stable presence of metal xanthates or xanthophylls. Calculations are based on mass balance, so it is possible to determine the amount of metal xanthate or xanthate produced under different conditions. Based on this, the optimal flotation conditions can be predicted and compared with the flotation data obtained from the experiments. In order to clarify the role of metastable species in flotation, volcanic experiments and intermittent galvanostatic pulse polarization experiments were conducted on galena and chalcocite electrodes at pH = 9.2. Based on the experimental results, the possible reaction mechanism was discussed and compared with the predicted results of thermodynamics.