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This paper investigates the application of hydrogen sulfide synthesis processes in copper smelting wastewater treatment. By comparing various hydrogen sulfide synthesis routes and traditional wastewater treatment methods such as sodium sulfide/sodium hydrosulfide sulfidation, neutralization, and combined processes, this study highlights the issues associated with the latter, including the introduction of sodium ions, the generation of large amounts of waste residue, high treatment costs, and unstable water quality. The research demonstrates that the methanol-sulfur synthesis process offers significant advantages in terms of cost, yield, and product purity. Taking a company's project as an example, this process can achieve a removal rate of over 99% for copper and arsenic ions in copper smelting wastewater, and over 95% for lead and zinc ions, enabling the treated wastewater to meet standards for reuse, reducing pollution and saving the company approximately 2 million yuan in wastewater treatment costs annually. Additionally, this study explores the challenges faced in practical applications, such as reaction temperature and pressure control, as well as requirements for raw material ratios and purity, and proposes corresponding strategies. The results indicate that the methanol-sulfur synthesis process is highly effective in copper smelting wastewater treatment, with future development focusing on catalyst research and the automation and intelligentization of the process.