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    • 8. 发明授权
    • Calomel (Hg.sub.2 Cl.sub.2) purification process
    • 甘汞(Hg2Cl2)净化过程
    • US5601795A
    • 1997-02-11
    • US551038
    • 1995-10-31
    • Donald L. BallRichard S. Varley
    • Donald L. BallRichard S. Varley
    • C01G13/04C01B9/00C01G13/00
    • C01G13/04
    • This invention is directed to a novel method for purifying calomel (Hg.sub.2 Cl.sub.2). More particularly, this invention pertains to a novel process for treating impure calomel (Hg.sub.2 Cl.sub.2) to produce a highly purified calomel product that passes American Chemical Society requirements for calomel assay and mercuric chloride contamination. A process for treating impure calomel to produce purified calomel comprising: (a) incorporating impure calomel into an aqueous slurry; (b) oxidizing the aqueous slurry with an oxidizing agent to form soluble mercuric chloride; (c) filtering the aqueous slurry containing soluble mercuric chloride into liquid and solid components; (d) heating the liquid component to greater than 70.degree. C; (e) treating the liquid component with a reducing agent to precipitate purified calomel; and (f) separating the precipitated purified calomel from the filtrate.
    • 本发明涉及一种纯化甘汞(Hg2Cl2)的新方法。 更具体地说,本发明涉及一种用于处理不纯的甘汞(Hg2Cl2)以产生高度纯化的甘汞产品的新方法,其通过美国化学学会对甘汞测定和氯化汞氯化物污染的要求。 一种用于处理不纯的甘汞以产生纯化的甘汞的方法,包括:(a)将不纯的甘汞混合到含水浆料中; (b)用氧化剂氧化含水浆料以形成可溶性氯化汞; (c)将含有可溶性氯化汞的含水浆料过滤成液体和固体组分; (d)将液体组分加热到大于70℃; (e)用还原剂处理液体组分以沉淀纯化的甘汞; 和(f)从滤液中分离沉淀的纯化甘汞。
    • 10. 发明授权
    • Recovery of rhodium values
    • 回收铑价值
    • US5314670A
    • 1994-05-24
    • US778122
    • 1991-10-30
    • Weimar W. WhiteGary G. Kiehl
    • Weimar W. WhiteGary G. Kiehl
    • C01G55/00G03C1/005G03C1/09G03C5/16C01B9/00C22B11/00
    • G03C1/09C01G55/002C01P2006/60C01P2006/80C01P2006/82G03C1/0051G03C2001/0055G03C2005/168G03C5/16
    • Ammonium pentachloromonoaquorhodate(III), (NH.sub.4).sub.2 RhCl.sub.5 (H.sub.2 O), is a useful photographic chemical. Small amounts of rhodium-containing, water soluble species remain in solution in the process liquor after synthesis. Most of the soluble rhodium values are present as the aforementioned ammonium complex; however there are traces of the cis and trans isomers of ammonium tetrachlorodiaquorhodate(III), and traces of the fac and/or mer isomers of rhodium(III) chloride triaquo complexes. Rhodium values present in the liquid as ammonium pentachloromonoaquorhodate(III) can be recovered by the addition of cesium chloride to form a precipitate identified as Cs.sub.2 RhCl.sub.5 (H.sub.2 O). Very little of the aforementioned fac and mer isomers or other contaminants, if any, are contained in the precipitate. The cesium rhodium pentachloride monohydrate product can be refined, for recovery of rhodium values, or used as an additive to a silver halide emulsion to control fog or stabilize the emulsion.
    • PCT No.PCT / US91 / 07979 371日期1991年10月30日 102(e)1991年10月30日PCT 1991年10月30日PCT公布。 第WO93 / 09063号公报 日期:1993年5月13日。五氯五氟乙酸(III),(NH4)2RhCl5(H2O)是一种有用的摄影化学品。 合成后,处理液中少量含铑,水溶性物质残留在溶液中。 大多数可溶性铑值作为上述铵络合物存在; 然而,痕量的四氯代二胡酸铵(III)的顺式和反式异构体,以及痕量的氯化铑(III)三元配合物的面和/或聚合物异构体。 可以通过加入氯化铯以形成被认定为Cs 2 R hCl 5(H 2 O)的沉淀物,回收在液体中存在的作为五氯亚麻酸(III)铵的铑值。 沉淀物中含有很少的上述fac和mer异构体或其他污染物(如果有的话)。 可以精制五氯化铯一水合物产品,用于回收铑值,或用作卤化银乳剂的添加剂以控制雾或稳定乳液。