(1. 中南大学 冶金科学与工程学院，长沙 410083；2. 金川有色金属公司，金昌 737100)
摘 要: 分析SO2在溶液中的存在形态，并对亚硫酸钠在酸性水溶液中还原硒进行热力学分析。通过实验研究验证热力学分析结果的正确性，并确定亚硫酸钠还原硒的最优技术参数：还原温度80 ℃，还原酸度3.5 mol/L，搅拌速率400 r/min，还原时间120 min，亚硫酸钠加入系数β(亚硫酸钠质量与溶液中硒的质量比)为10。在最佳技术条件下，硒的还原率为99.18%，研制的硒粉品位为99.684%。XRD和SEM-EDS的分析结果表明：硒粉微观形态复杂，只观察到元素硒的特征谱线，证明还原硒粉纯度较高。
关键字: 硒；亚硫酸钠；还原；热力学；应用
leaching solution of smelting dust of Ni-Mo ore
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. Jinchuan Nonferrous Metals Corporation, Jinchang 737100, China）
Abstract:The chemistry of sulphur dioxide in solution and the thermodynamics of selenium reduction using sodium sulphite from acidic solution were analyzed. The experiment results demonstrate the thermodynamic analysis. The optimum technological parameters were determined for reducing selenium by sodium sulfite. The reduction of selenium reaches 99.18%, and the grade of selenium powder reaches up 99.684% under the optimum conditions of acidity of 3.5 mol/L with stirring speed of 400 r/min at the reductive temperature of 80 ℃ for 120 min and the coefficient β (the mass ratio of sodium sulphite to selenium) of 10. The XRD and SEM-EDS analysis results show that the microcosmic morphology of powdered-selenium is complex, only the characteristic spectrum of elemental selenium is observed, which proves that the product of selenium powder is very pure.
Key words: selenium; sodium sulfite; reduction; thermodynamics; application
