公开(公告)号：US3832453A

公开(公告)日：1974-08-27

申请号：US20127471

申请日：1971-11-23

申请人： EASTMAN KODAK CO

发明人： BOBER T ,  SLOVONSKY I ,  DAGON T

IPC分类号： C02F1/52 ,  C02F9/00 ,  G03C5/395 ,  C01G5/00

CPC分类号： C02F9/00 ,  C02F1/5236 ,  C02F2101/20 ,  G03C5/3952

摘要： Silver is recovered from an exhausted photographic fix or bleach-fix solution by bringing together just at the entrance of a static mixer a stream of a sodium sulfide solution and a stream of fix or bleach-fix solution, and passing the mixture at high velocity through the static mixer, wherein it is repeatedly divided and changed in flow pattern, to precipitate silver sulfide particles. The flowing mixture containing silver sulfide particles is then passed into a separation chamber of enlarged cross section, and its flow is slowed and reversed by baffles to cause the silver sulfide particles to drop out and collect in the bottom. A fix solution is regenerated for reuse by the above procedure. When a bleach-fix is treated, it can be regenerated by introducing air, either upstream or downstream of the separation chamber, to reoxidize to ferric ions any ferrous ions present as a result of the bleaching operation, or those ferrous ions produced by reaction of sodium sulfate with residual ferric ions in the exhausted bleach-fix. A small amount of acid also should be added to adjust the pH to below 7.

摘要翻译： 通过在静态混合器的入口处将硫化钠溶液流和固定或漂白固定溶液流聚合在一起，并将混合物高速通过，从而从耗尽的照相固定或漂白固定溶液中回收银 静态混合器，其中它被重复地划分并且以流动方式改变，以沉淀硫化银颗粒。 然后将含有硫化银颗粒的流动混合物进入扩大横截面的分离室中，其流动被挡板减慢并反向，导致硫化银颗粒掉落并收集在底部。 重新生成修复解决方案，以便上述过程重新使用。 当处理漂白剂时，可以通过在分离室的上游或下游引入空气来再生氧，以便将铁离子再次氧化成由于漂白操作而存在的任何亚铁离子，或通过反应产生的那些亚铁离子 硫酸钠与残留的铁离子在耗尽的漂白剂中固定。 还应加入少量酸以将pH调节至7以下。