Eastman-kodak Company

Charles S Christ

Albert R Szembrot

Jianmin Shi

Jay E Mathewson

Stephen N Lowery

James J Carey

Robert Ciamarra

James R Kulp

There is provided a method for removing silver from photoprocessing solutions containing hardening agents which comprises:

Process for recovery of silver from hardening photoprocessing solutions

There is provided a process for converting a silver-mercapto-s-triazine precipitate to a solid containing silver and a solution containing mercapto-s-triazine by contacting the silver-mercapto-s-triazine precipitate with one or more reducing agents. In preferred embodiments, at least one of the reducing agents has a redox potential more negative than about -0.9 V vs. Normal Hydrogen Electrode, NHE.

Process for recovering mercapto-s-triazines from silver precipitate

A method for making trialkali metal and triammonium salts of 2,4,6 trimercapto-s-triazine comprising the steps of:

Method of making trialkali and triammonium salts of tmt

A process for inhibiting the formation of an unwanted precipitate comprising [H.sub.2-n TMT]Na.sub.n [HNR.sub.3 ] during the precipitation of silver mercapto-s-triazine (AgTMT) from a silver containing photoprocessing solution, comprising the steps of: (a) providing a base solution; (b) providing a reagent solution containing mercapto-s-triazine (TMT), or a water soluble salt thereof; (c) mixing the TMT reagent solution with the photoprocessing solution; and (d) adding sufficent base to increase the pH of the mixture of the TMT reagent and photoprocessing solutions above the pH of the mixture before addition of base, and the base is mixed: (i) directly to the photoprocessing solution before mixing TMT reagent with the photoprocessing solution; or (ii) with the photoprocessing solution concurrently with TMT reagent; or (iii) immediately after the point TMT reagent begins mixing with the photoprocessing solution.

Process of recovering silver from photographic solutions and inhibiting

A method of removing undesired precipitate from the surfaces of an apparatus; wherein the apparatus is used in a process for removing silver from silver bearing photoprocessing solutions and the process includes the step of mixing a mercapto-s-triazine, or a water soluble salt thereof, with a silver bearing photoprocessing solution, thereby causing formation of the undesired precipitate and a precipitate of silver mercapto-s-triazine, said method comprising flushing inner surfaces of the apparatus with an aqueous solution having a pH of at least 9.8 thereby solubilizing the undesired precipitate.

Method for flushing an undesired precipitate from apparatus surfaces

A process for removing silver from a silver containing photoprocessing solution, including the steps of:

Process of recovering silver from photographic solutions

A method of treating a solute in a liquid solution in order to render the solution more acceptable for discharge into the environment, comprises electrolyzing the solution with an anode comprising electrically conductive crystalline doped diamond to thereby oxidize the solute.

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Fairport, NY, United States of America

Charles S Christ