(1. 中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083；2. 金川有色金屬公司，金昌 737100)
摘 要: 分析SO2在溶液中的存在形態(tài)，并對亞硫酸鈉在酸性水溶液中還原硒進行熱力學(xué)分析。通過實驗研究驗證熱力學(xué)分析結(jié)果的正確性，并確定亞硫酸鈉還原硒的最優(yōu)技術(shù)參數(shù)：還原溫度80 ℃，還原酸度3.5 mol/L，攪拌速率400 r/min，還原時間120 min，亞硫酸鈉加入系數(shù)β(亞硫酸鈉質(zhì)量與溶液中硒的質(zhì)量比)為10。在最佳技術(shù)條件下，硒的還原率為99.18%，研制的硒粉品位為99.684%。XRD和SEM-EDS的分析結(jié)果表明：硒粉微觀形態(tài)復(fù)雜，只觀察到元素硒的特征譜線，證明還原硒粉純度較高。
關(guān)鍵字: 硒；亞硫酸鈉；還原；熱力學(xué)；應(yīng)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
