Apparatus for treatment of polymeric material

Cleaning and liquid contact with solids – Apparatus – With plural means for supplying or applying different fluids...

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134111, 134186, 210220, B08B 308

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active

046605851

ABSTRACT:
The present invention is directed to a method and apparatus for the detoxification of polymeric film chip materials which have been contaminated with cyanide compounds during the process for the reclamation of their silver content. The present invention includes the steps of providing within a substantially impervious container a quantity of polymeric film chip materials containing a cyanide compound, and then submerging the cyanide containing polymeric film chip materials in a solution containing hypochlorite ion at a pH of approximately 9.5 to 10.5 until the cyanide in the polymeric film chip material is substantially converted into cyanate. In preferred alternative embodiments the treatment solution is replaced with a second treatment solution containing hypochlorite ion and having a pH of approximately 7.5 to 8 until the cyanate is substantially converted into carbon dioxide and nitrogen gases. Mixing means in the form of influent and effluent means are provided in such apparatus.

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patent: 2582802 (1952-01-01), Terrell, Jr.
patent: 2742381 (1956-04-01), Weiss et al.
patent: 2774585 (1956-12-01), Wirts

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