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    • 34. 发明授权
    • Process for extracting and recovering silver
    • 提取和回收银的方法
    • US5885535A
    • 1999-03-23
    • US8492
    • 1998-01-16
    • Satoshi AsanoKaoru Terao
    • Satoshi AsanoKaoru Terao
    • C22B3/16C22B3/38C22B11/00
    • C22B3/007C22B11/04Y02P10/234
    • A process for extracting and separating silver safely and selectively from a raw material containing slightly soluble silver compounds and recovering silver from the extract in a simple manner without resorting to electrolysis or a special reducing agent, and further recovering high-purity silver, includes mixing the raw material with an organic solvent solution of an organophosphorus compound containing in the molecule sulfur in the form of S.sup.2- ions, thereby extracting silver into an organic phase simultaneously with dissolving the slightly soluble silver compounds, stripping the silver from the organic phase containing the extracted silver with an aqueous solution of alkali sulfite and forming a stripping solution, and reducing the stripping solution to separate silver therefrom.
    • 包括从含有微溶银的原料中提取和分离银的方法,并且简单地从提取物中回收银而不使用电解或特殊的还原剂,并进一步回收高纯度银的方法包括将 原料与分子中含有S2-离子形式的硫的有机磷化合物的有机溶剂溶液,从而将银溶解到有机相中同时溶解微溶的银化合物,从含有萃取物的有机相中汽提银 银与碱性亚硫酸盐的水溶液形成剥离溶液,并且还原剥离溶液以从其中分离银。