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    Recovery of precious metals from a thiourea leach
    4.
    发明授权
    Recovery of precious metals from a thiourea leach 失效
    从硫脲浸出中回收贵金属

    公开(公告)号：US4778519A

    公开(公告)日：1988-10-18

    申请号：US35388

    申请日：1987-04-07

    申请人： Batric Pesic

    发明人： Batric Pesic

    IPC分类号： C01G5/00 ,  C01G7/00 ,  C22B7/02 ,  C22B11/00 ,  C22B11/04

    CPC分类号： C01G7/003 ,  C01G5/003 ,  C22B11/04 ,  C22B11/042 ,  C22B11/044 ,  C22B11/046 ,  C22B3/24 ,  C22B7/02 ,  Y02P10/214 ,  Y02P10/234 ,  Y02P10/236

    摘要： A method is provided for recovering gold and silver from precious metal bearing materials including ores, leaching residues, flue dust, electronic scrap, jewelry scrap, etc. In the method, the gold and silver are extracted from the precious metal bearing materials with a thiourea solution to form a thiourea leach, and the thiourea leach is contacted with carbon to adsorb the gold and silver and provide loaded carbon. The method is characterized by the step of contacting an alkaline solution of thiousulfate ion with the loaded carbon thereby desorbing the precious metals form the carbon. In one modification of the method, an additional step includes adding a salt to the aqueous thiousulfate solution. When needed, the method includes the step of protecting the thiousulfate ion from oxidizing agents. This is done by adding a reducing agent such as sodium sulfite to the thiousulfate solution. When copper is present, the method includes the addtional step of removing copper from the carbon prior to exposing the carbon to the thiourea solution containing the precious metals.

    摘要翻译： 提供从贵金属轴承材料（包括矿石，浸出残渣，烟尘，电子废料，珠宝废料等）中回收金和银的方法。在该方法中，金和银从含有硫脲的贵金属轴承材料中提取 溶液形成硫脲浸出，硫脲浸出物与碳接触以吸附金和银并提供负载的碳。 该方法的特征在于使硫酸根离子的碱性溶液与负载的碳接触，从而从碳解吸贵金属。 在该方法的一个修改中，另外的步骤包括向硫酸水溶液中加入盐。 当需要时，该方法包括保护硫酸根离子免于氧化剂的步骤。 这是通过向硫酸盐溶液中加入还原剂如亚硫酸钠来完成的。 当存在铜时，该方法包括在将碳暴露于含有贵金属的硫脲溶液之前从碳上除去铜的附加步骤。

    Recovery of silver and gold
    5.
    发明授权
    Recovery of silver and gold 失效
    回收银和金

    公开(公告)号：US4662938A

    公开(公告)日：1987-05-05

    申请号：US660011

    申请日：1984-10-11

    申请人： John W. Whitney ,  John H. Templeton

    发明人： John W. Whitney ,  John H. Templeton

    IPC分类号： C22B11/00 ,  C25C3/34

    CPC分类号： C22B11/044 ,  C22B11/04 ,  C25C3/34 ,  Y02P10/214

    摘要： This invention provides processes for selectively recovering silver and gold values from feed materials containing both precious metals, and comprises leaching the feed material with a hot ferric chloride-acid brine leach solution for a time sufficient to dissolve the silver, but wherein the gold is not dissolved and remains with the solid residue. The silver-containing ferric chloride-acid brine leachate is separated from the solid residue containing the gold. The leach solution is then cooled to precipitate the silver as silver chloride. The solid residue containing the gold is then leached with hypochlorous acid to dissolve the gold, and after separating the solids form the gold-containing hypochlorous acid leach solution, the gold is precipitated by contacting the solution with sulfur dioxide. The silver chloride may be further processed in a fused salt electrolysis step at or above the melting point of silver to produce a substantially pure silver and chlorine gas. The chlorine gas can then be used in regenerating the spent ferric chloride-acid brine leach solution.

    摘要翻译： 本发明提供从含有贵金属的原材料中选择性地回收银和金的方法，并且包括用热氯化铁 - 酸性盐酸浸出溶液浸提原料足够溶解银的时间，但其中金不是 溶解并保留固体残余物。 从含有金的固体残余物中分离含银的氯化铁 - 酸性盐酸浸出液。 然后将浸出溶液冷却以使氯化银沉淀。 然后将含有金的固体残余物用次氯酸浸出以溶解金，并且在分离固体形式的含金次氯酸浸出溶液后，通过使溶液与二氧化硫接触来沉淀金。 氯化银可以在银熔点以上的熔盐电解步骤中进一步处理，以产生基本上纯的银和氯气。 然后可以将氯气用于再生废弃的氯化铁 - 酸性盐水浸出溶液。

    PROCESS FOR DIGESTION OF A METALLIC IRIDIUM- AND/OR IRIDIUM OXIDE-COMPRISING MIXTURE OF SOLID PARTICLES
    7.
    发明申请
    PROCESS FOR DIGESTION OF A METALLIC IRIDIUM- AND/OR IRIDIUM OXIDE-COMPRISING MIXTURE OF SOLID PARTICLES 审中-公开

    公开(公告)号：US20180112290A1

    公开(公告)日：2018-04-26

    申请号：US15566332

    申请日：2016-02-24

    申请人： Heraeus Deutschland GmbH & Co. KG

    发明人： Martin Stettner ,  Magdalena Günther ,  Stefanie Fuchs Alameda ,  Vasco Thiel ,  Steffen Voß

    IPC分类号： C22B3/00

    CPC分类号： C22B11/044 ,  C22B5/12 ,  Y02P10/214

    摘要： Process for digestion of fine iridium, comprising the steps of: (a) alkaline oxidative digestion of 1 part by weight fine iridium and 3 to 20 parts by weight of a combination comprising 40 to 70 parts by weight sodium hydroxide, 15 to 30 parts by weight sodium nitrate, and 10 to 40 parts by weight sodium peroxide in the melt, whereby the sum of the weight fractions adds up to 100 parts by weight; (b) cooling the digestion material formed in step (a) to 20 to 70° C.; (c) dissolving the acid-soluble fractions of the cooled digestion material in water/halogen hydracid until an acidic aqueous solution with a pH value in the range of −1 to +1 is obtained; and (d) boiling the acidic aqueous solution obtained in step (c) until the formation of nitrous gases is completed; whereby a step (e) of separating insoluble ingredients from the acidic aqueous solution can take place before or after step (d), if needed.