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一、引言我室在研究湿法回收再生铅的工作中发现,于一般无机溶剂中很难溶解的 PbO_2,在添加多元醇的氢氧化钠热溶液中能够较快地完全溶解;此外,多元醇碱性溶液对 PbO 的溶解也呈现出有利的影响,这一事实为直接湿法处理再生铅开拓了一个新的可能途径。目前,有关多元醇在湿法提铅中的应用及反应机理的报道和理论分析尚很缺乏。本工作是结合上述湿法浸取新工艺的需要,对氢氧化钠碱性溶液中铅氧化物与多元醇(乙二醇、丙三醇、木糖醇、甘露醇)的相互作用开展了实验研究,对其中的反应机理进行了初步探讨,目的是为促进该新工艺的开发与应用。
I. INTRODUCTION In our work on the wet recovery of lead, it was found that PbO 2, which is hard to dissolve in general inorganic solvents, can be completely dissolved rapidly in the hot solution of sodium hydroxide added with polyhydric alcohol. In addition, The fact that alkaline solutions also have a favorable effect on the dissolution of PbO opens up a new possible avenue for direct wet-process regeneration of lead. At present, there is still a lack of reports and theoretical analysis about the application and reaction mechanism of polyols in wet extraction of lead. This work is the combination of the wet-leaching of the new technology needs, the alkaline solution of sodium hydroxide in the lead oxide and polyol (ethylene glycol, glycerol, xylitol, mannitol) the interaction experiment carried out Research, the reaction mechanism of which a preliminary study, the purpose is to promote the development and application of the new process.