Through thermodynamic calculations, the E-pH diagrams of the Bi-S-H₂O and Bi-S-Cl-H₂O systems at 298 K were plotted, the dominant regions of the components in the system and their changes with pH were clarified, and the mechanism and thermodynamic conditions for the decomposition of Bi₂S₃ in acidic systems were clarified. The key to the decomposition of Bi₂S₃ in acidic systems was based on the coordination of Cl⁻ and Bi³⁺. The formation of BiCl₄⁻ can promote the decomposition of Bi₂S₃ in acidic systems, based on this characteristic, HCl was used to achieve efficient leaching of bismuth in molybdenite-bismuthinite mixed ore. Under the optimized conditions of hydrochloric acid concentration of 6 mol/L, liquid-to-solid ratio of 5:1, temperature of 95 °C, stirring speed of 400 rpm, and time of 300 min, the leaching efficiency of bismuth reached 97.64 %, and the bismuth content in the leaching residue was 0.93 %, while molybdenum remained in the form of MoS₂ in the residue, The efficient separation of molybdenum and bismuth has been achieved, providing a new process to solve the traditional separation of molybdenite-bismuthinite mixed ores.

通过热力学计算，绘制了Bi-SH ₂ O和Bi-S-Cl-H ₂ O体系在298 K时的E-pH图，阐明了体系中组分的优势区域及其随pH的变化，阐明了酸性体系中Bi ₂ S ₃分解的机理和热力学条件。_{Bi 2} S ₃在酸性体系中分解的关键是基于Cl ^-和Bi ³⁺的配位。_{BiCl 4} ^-的形成可以促进Bi ₂ S ₃的分解在酸性体系中，基于这一特点，利用HCl实现了辉钼矿-铋矿混矿中铋的高效浸出。在盐酸浓度6 mol/L、液固比5:1、温度95 ℃、搅拌速度400 rpm、时间300 min的优化条件下，铋的浸出效率达到97.64 _{%，浸出渣中铋含量为0.93%，而钼以MoS 2}的形式存在于渣中，实现了钼、铋的高效分离，为解决传统辉钼矿分离-铋矿混矿。