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4303441 |
Metal recovery process
A method for recovering a metal from a solution containing ions of the metal and a complexing agent for the ions is disclosed. The method involves contacting the solution with another metal more...
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4279644 |
Recovery of silver from photographic processor effluents
Wash-off effluent from a photographic film processor is desilvered by a continuous process, employing the following sequence of steps: 1. Addition of anti-foaming agent. 2. Acidification. ...
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4240617 |
Ultra low volume processing of and cartridge for photographic fixer solution to recover silver therefrom
A small tubular cartridge for processing of ultra low volumes of gravity flow spent photographic fixer solution to recover residual silver therefrom. The tube cartridge comprises a hollow...
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4227681 |
Silver recovery cartridge for used fixer of neutral or higher pH
A method and article for substantially preventing premature obstruction to flow in a canister of a silver recovery device comprising placing a porous pad at the inlet surface of the metallic filler...
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4156604 |
Controlled delivery of corrosion inhibitors for silver recovery cartridges
A method for controlled delivery of corrosion inhibitors to a silver containing solution in a silver recovery device which utilizes a metallic fill for electron exchange. The method involves...
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4155810 |
Treating of waste photographic processing solutions and silver recovery therefrom using chemo-synthetic sulfur bacteria
A method for treating a waste photographic processing solution containing a silver-sulfur compound comprising applying chemo-synthetic sulfur bacteria to the waste solution under aerobic conditions.
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4150977 |
Process for stripping photographic materials
This invention provides a method and apparatus for treating photographic film to recover silver and the plastic base layer for re-use. A wash tank containing warm water at about neutral pH contains...
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4135976 |
Treatment of photographic processing effluents using photosynthetic sulfur bacteria
A process of treating a waste photographic processing solution containing reductive sulfur compounds, in particular, a waste fix solution for silver halide photographic materials, by applying...
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4129441 |
Recovery of silver from silver containing solutions
Silver is precipitated from an aqueous sulphate solution containing dissolved silver and other metals at a temperature between about 60° C. and about 125° C. by hydrogen gas at a partial pressure...
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4123500 |
Recovery of precious metals by oxidation in the aqueous phase of associated carbonaceous support material
This invention relates to the recovery of precious metals. More particularly, the invention relates to a process for the recovery of a catalytic metal from a carbonaceous residue or support...
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4110109 |
Oxidation inhibition of steel wool in silver recovery
The addition of certain materials which inhibit corrosion and hydrogen embrittlement of iron to silver-rich solutions or to steel wool which is used to desilver such solutions reduces hydrogen ion...
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4078916 |
Recovery of silver and other valuable constituents from polyester based photographic film
Scrap photographic film comprising at least a four component system involving a polyalkyleneterephthalate film base, an adhesive or subbing layer utilizing a terpolymer consisting chiefly of...
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4078918 |
Method for precious metal recovery
A recovery process for reclaiming precious metals from industrial process residues, such as silver chloride resulting from salt analysis of meats in a packing plant, or alternatively, from...
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4038079 |
Process for the regeneration of photographic bleach-fix baths
Photographic bleach-fix baths containing iron-III-complexes of aminopolyacetic acids as oxidizing agents are rejuvenated by reducing the iron-III-complexes with a reducing agent other the iron and...
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4038080 |
Fix and bleach-fix bath desilvering
Silver is removed from used fix or bleach-fix baths by adding a compound of the general formula: ##STR1## wherein: X is an oxygen atom or imino group, R is an aryl, or a group of the formula R 1 ...
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4035181 |
Protection of silver reduction materials
Materials have been found which retard the dissolution of steel wool during reduction of silver-rich solutions to reclaim silver therein. These materials include certain amines, ammonium salts,...
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4008077 |
Rejuvenation of waste silver-laden solutions
A method is provided for recovering metallic silver from used silver-laden solutions, such as spent photographic fix, stop baths, stabilizers, electrolytic fix tailings, and waste silver-plating...
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3982932 |
Recovery of silver from gelatinous photographic wastes
Silver is recovered from photographic waste liquids containing emulsified silver, silver compounds, and gelatin by reacting therewith a proteolytic enzyme while the reactants are maintained in an...
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3956088 |
Process for the destruction of developed and undeveloped photosensitive film and the recovery of products therefrom
The destruction of developed or undeveloped photographic film in a manner which permits also the recovery of silver and organic components from the film material in which the film is subjected to...
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3873314 |
Recovery of clean polyester materials from photographic film
Polymers containing polyvinylidene halides are generally used as a subbing or anchoring layer between a polyester film base and a gelatin layer containing halides or other silver compounds. It has...
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3748123 |
PROCESS FOR METAL RECOVERY
Metals, particularly precious metals, embedded in or otherwise confined by enzyme-degradable organic media as in photographic film or printed circuits are recovered in the form of metal or metal...
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3705716 |
MONITORING SILVER RECOVERY
Silver is recovered from a photographic processing solution by passing the solution through a mass of steel wool in a recovery vessel. The effluent electrolyte from the vessel is then passed...
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3660079 |
PRECIOUS METALS RECOVERY METHOD
Photographic emulsion scrap is broken down into a liquid dispersion in a hot solution of an acid such as hydrochloric acid. A finely divided metal powder, such as zinc powder, is added to the...
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3649250 |
SILVER RECOVERY PROCESS
Silver is recovered from silver-containing scrap paper (e.g., scrap thermographic office copy paper) by a process which involves conditioning the silver-containing paper (e.g., with hot dilute...
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3647422 |
RECOVERY OF SILVER, POLYESTER AND AMINO ACIDS FROM PROCESSED FILM
Recovery of silver, polyester and amino acids from processed silver halide gelatin photographic film.
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3369801 |
Silver recovery unit
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3346369 |
Process for recovering silver
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3082079 |
Silver recovery from photographic fixing solutions
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