公开(公告)号：US4445935A

公开(公告)日：1984-05-01

申请号：US449312

申请日：1982-12-13

申请人： Franz A. Posey ,  Aloysius A. Palko

发明人： Franz A. Posey ,  Aloysius A. Palko

IPC分类号： G03C5/38 ,  C02F1/62 ,  C22B7/00 ,  C22B11/00 ,  G03C11/24 ,  C22B11/06

CPC分类号： C22B7/008 ,  C22B11/04 ,  Y02P10/234

摘要： The method of the present invention is directed to the recovery of silver from spent photographic fixer solutions and for providing an effluent essentially silver-free that is suitable for discharge into commercial sewage systems. The present method involves the steps of introducing the spent photographic fixer solution into an alkaline hypochlorite solution. The oxidizing conditions of the alkaline hypochlorite solution are maintained during the addition of the fixer solution so that the silver ion complexing agents of thiosulfate and sulfite ions are effectively destroyed. Hydrazine monohydrate is then added to the oxidizing solution to form a reducing solution to effect the formation of a precipitate of silver which can be readily removed by filtration or decanting. Experimental tests indicate that greater than 99.99% of the original silver in the spent photographic fixer can be efficiently removed by practicing the present method. Also, the chemical and biological oxygen demand of the remaining effluent is significantly reduced so as to permit the discharge thereof into sewage systems at levels in compliance with federal and state environmental standards.

摘要翻译： 本发明的方法涉及从废照相定影剂溶液中回收银并提供基本上不含银的流出物，其适于排放到商业污水系统中。 本方法包括将用过的照相定影剂溶液引入碱性次氯酸盐溶液的步骤。 碱性次氯酸盐溶液的氧化条件在添加定影剂溶液期间保持，使得硫代硫酸盐和亚硫酸根离子的银离子络合剂被有效地破坏。 然后将一水合肼加入到氧化溶液中以形成还原溶液以形成银沉淀物，其可以通过过滤或倾析而容易地除去。 实验测试表明，通过实施本方法可以有效地除去废照相定影剂中原始银的99.99％以上。 此外，剩余废水的化学和生物需氧量显着降低，以便允许以符合联邦和州环境标准的水平排放到污水系统中。

公开(公告)号：US4004993A

公开(公告)日：1977-01-25

申请号：US661571

申请日：1976-02-26

申请人： Donald E. Horner ,  James C. Mailen ,  Franz A. Posey

发明人： Donald E. Horner ,  James C. Mailen ,  Franz A. Posey

IPC分类号： B01D53/70 ,  B01D53/68 ,  B01D53/77 ,  B01J19/08 ,  G21F9/00 ,  C25B1/24

CPC分类号： G21F9/007 ,  B01D53/68

摘要： A method for removing molecular, inorganic, and organic forms of iodine from process gas streams comprises the electrolytic oxidation of iodine in the presence of cobalt-III ions. The gas stream is passed through the anode compartment of a partitioned electrolytic cell having a nitric acid anolyte containing a catalytic amount of cobalt to cause the oxidation of effluent iodine species to aqueous soluble species.

摘要翻译： 从工艺气流中除去分子，无机和有机形式的碘的方法包括在钴-III离子存在下电解氧化碘。 气流通过具有含有催化量的钴的硝酸阳极电解液的分隔的电解池的阳极室，以使出口碘物质氧化成水溶性物质。

公开(公告)号：US4432945A

公开(公告)日：1984-02-21

申请号：US318081

申请日：1981-11-04

申请人： Fred J. Hurst ,  Gilbert M. Brown ,  Franz A. Posey

发明人： Fred J. Hurst ,  Gilbert M. Brown ,  Franz A. Posey

IPC分类号： C01G43/00 ,  C22B60/02

CPC分类号： C22B60/026

摘要： An improvement in effecting uranium recovery from phosphoric acid solutions is provided by sparging dissolved oxygen contained in solutions and solvents used in a reductive stripping stage with an effective volume of a nonoxidizing gas before the introduction of the solutions and solvents into the stage. Effective volumes of nonoxidizing gases, selected from the group consisting of argon, carbon dioxide, carbon monoxide, helium, hydrogen, nitrogen, sulfur dioxide, and mixtures thereof, displace oxygen from the solutions and solvents thereby reduce deleterious effects of oxygen such as excessive consumption of elemental or ferrous and accumulation of complex iron phosphates or cruds.

摘要翻译： 在将溶液和溶剂引入阶段之前，通过用有效体积的非氧化气体喷射在还原汽提阶段中使用的溶液和溶剂中所含的溶解氧来提供从磷酸溶液中回收铀的效果。 选自氩气，二氧化碳，一氧化碳，氦气，氢气，氮气，二氧化硫及其混合物的非氧化气体的有效体积从溶液和溶剂中取代氧，从而减少氧的有害影响，例如过度消耗 元素或亚铁和复合铁磷酸盐或原油的积累。