Method for the recovery of silver from waste motorstore, rinsing and sewage

 

(57) Abstract:

The invention relates to hydrometallurgy of precious metals and can be applied to the spent solutions and proryvnym waters generated during the processing of photosensitive silver, including color, materials, and also for the recovery of silver from other containing solutions. Method for the recovery of silver from waste motorstore wash and wastewater involves sorption of silver, Department of saturated silver sorbent from the solution, drying, calcination saturated sorbent and smelting of metallic silver from concentrate; as sorbent using bis-(dimethylthiocarbamyl) disulfide. Sorption of silver is carried out in static mode with a flow rate of 1.5-1.6 g of sorbent at 1 g in the solution of silver; in dynamic mode, using the specified sorbent coated on a porous media with large surface, for example on activated carbon with a particle size of 0.1 to 1.5 mm Using bis-(dimethylthiocarbamyl) disulfide as a sorbent allows you to extract silver in a wide range of concentrations and pH of the fixing solutions of the black-and-white and color film and other wash and wastewater the proposed method for the recovery of silver is relatively simple and can be used in manufacturing in a wide scale. 2 C.p. f-crystals.

The invention relates to hydrometallurgy of precious metals and can be applied to the spent solutions and proryvnym waters generated during the processing of photosensitive silver, including color, materials, and also for the recovery of silver from other containing solutions (secondary silver).

A method of obtaining silver from fixing solutions (patent RF N 2043968, C 01 G 5/00, G 03 C 11/24, 1995), including the processing of sorbents, eat silver with sorbents processing of silver-containing products, as sorbents used polymer preparations containing sulfur atoms and nitrogen adequate valence state in an individual the presence or vzaimozachetnykh and the removal of the silver produced from silver-containing sorbent heat treatment.

The disadvantage of this method is that the proposed sorbents ineffective at removing silver with color film, and, in addition, have a low sorption capacity and ineffective against otbelivanie-fixing solutions containing compounds of iron and chelating agents.

Known sorbent (a. C. the USSR N 1090742, class C 22 In 11/04, 1984), which has a very high sorption capacity of the I effectiveness in thiosulfate solutions.

Closest to the proposed sorption is a process for recovering silver from spent fixing solutions of sodium cellulose xanthate (O. N. Humane and other Extraction of silver from spent fixing solutions of the xanthates of the cellulose. Journal of scientific. and go active. the photographer. and the cinema. , 1978, T. 23, N 3). The static capacity of the sorbent at a concentration of silver in a solution of 2.0 g/DM3is 100 mg/g, the duration of the process of sorption of 24 hours.

The disadvantage of the sorbent is that the sorption capacity is not high enough and the sorption of long runs.

The present invention is to increase the efficiency of extraction of silver from silver-containing solutions.

The task is achieved by a method for the recovery of silver from waste motorstore wash and wastewater, which includes the sorption of silver, Department of saturated silver sorbent from the solution, drying, calcination saturated sorbent and smelting of metallic silver from concentrate, as a sorbent using bis-(dimethylthiocarbamyl) disulfide, practically insoluble in thiosulfate solution.

Sorption of silver spend the IU.

When the extraction of silver from wash water and sewage in the dynamic mode specified sorbent applied to porous media with large surface, for example on activated carbon with a particle size of 0.5-1.5 mm

We propose as a sorbent of silver from waste motorstore and other solutions to use bis-(dimethylthiocarbamyl) disulfide. The sorption capacity when removing silver from various waste motorstore and wash water at the proposed sorbent is higher than in the known, and the process of sorption is almost complete within three hours. The degree of extraction of silver from solutions more than 99,0%, sorption can be performed in static or dynamic conditions.

Rich silver sorbent is separated from the solution, dried and calcined to obtain a concentrate from which smelted metallic silver purity of 99.5-99.8 per cent.

The following examples illustrate the proposed solution.

Example 1

To 0,300 DM3spent a simple fixer (250 g pativedha sodium thiosulfate in 1 DM3solution), with a concentration of silver of 6.9 g/DM3received as a model solution in the processing unmanifest, fotopro temperature of 20oC the precipitate separated from the solution by filtering.

The residual concentration of silver in the filtrate 0.002 g/DM3. The degree of extraction of silver at 99.95%, the sorption capacity of the sorbent 0.625 g of silver/,

Example 2

To 0,300 DM3contaminated developer waste solution simple standard fixer after processing black-and-white negative film, with a concentration of silver of 3.1 g/DM3enter 1.5 g of bis-(dimethylthiocarbamyl) disulfide. The suspension is stirred for three hours at 18oC and separated on a laboratory centrifuge at 4000 g. The residual concentration of silver in the centrate 0.002 g/DM3. The degree of extraction of silver 99,93%, the sorption capacity of the sorbent of 0.62 g of silver/,

Example 3

To strongly contaminated by the developer for a long time kept the standard solution acidic fixer after processing of the photographic paper, with the concentration of silver at 1.91 g/DM3and pH 8 add bis-(dimethylthiocarbamyl) disulfide at the rate of 1.5 g of sorbent at 1 g in the silver solution.

The mixture is stirred for three hours at room temperature and separated into running a laboratory centrifuge. The residual concentration of silver in the centrate 0.005 g/DMth fixer after processing color reversible film with a concentration of silver of 5.1 g/DM3and containing an impurity of ferricyanide injected 2.5 g of bis-(dimethylthiocarbamyl) disulfide. The suspension is stirred for three hours at room temperature and separated by filtration. The residual content of silver in the filtrate 0.003 g/DM3the degree of extraction of silver 99,94%; the capacity of the sorbent silver 0,612 g/,

Example 5

It worked otbelivanie-fixing solution after processing the color photographic paper with a concentration of silver of 6.3 g/DM3and containing complex salts of iron and ethylenediaminetetraacetic acid added bis-(dimethylthiocarbamyl) disulfide based 1.6 g of sorbent at 1 g in the silver solution.

The suspension is stirred for three hours and separated on a vacuum filter. The residual concentration of silver in the filtrate 0,030 g/DM3the degree of extraction of 99.5%, the capacity of the sorbent silver 0.625 g/,

If after three hours of stirring, the suspension is left for 24 hours to improve the filtration characteristics of the sediment, the residual concentration of silver in the filtrate decreased to 0,012 g/DM3the degree of extraction respectively increased to 99.8%.

Re-sorption treatment of leachate at the rate of 1.5 g of intracel silver to 0.003-0.005 g/DM3.

Example 6

The extraction of silver carried out from a mixture of waste and fixing otbelivanie-fixing solutions after processing black-and-white and color photographs, taken in the ratio of about 1:1 by volume with an average concentration of silver 3.8 g/DM3. Bis-(dimethylthiocarbamyl) disulfide added at the rate of 1.6 g of sorbent at 1 g in the silver solution. The duration of stirring 3 hours at room temperature. The precipitate was separated by filtration on a vacuum filter. After a single sorption residual concentration of silver in the filtrate 0.005 g/DM3.

Example 7

The extraction of silver from the water from the washing of the photographic material after fixation with the concentration of silver 0,050 g/DM3carried out in dynamic mode at room temperature in the column. The volumetric rate of the solution is 1 h-1.

As the sorbent used activated charcoal with a fairly wide pores (for example, brand BAU), which cause 10-15 wt.% bis-(dimethylthiocarbamyl) disulfide.

It has been found that the efficiency of the sorbent depends on the particle size of the carrier.

When the above-mentioned flow rate of the solution of the optimal size of h is s silver is with a 99.6%. The capacity of the sorbent silver to leakage (leakage is the increase in the concentration of silver output up to 0.002 g/DM3) 0.25 g per 1 g applied bis-(dimethylthiocarbamyl) disulfide. A special experience was found that by itself, the coal BAU almost not adsorb silver in these conditions.

Example 8 (prototype)

To 0,300 DM3contaminated developer waste solution simple standard fixer after processing black-and-white negative film with the concentration of silver 2.0 g/DM3introducing 10 g of cellulose xanthate obtained directly xanthogranuloma alkali cellulose. Sorption of lead for 30 hours. The degree of extraction of silver 90%, the capacity of the sorbent silver is 100 mg/g

Thus, the use of bis-(dimethylthiocarbamyl) disulfide as a sorbent allows you to extract silver in a wide range of concentrations and pH of the medium from the fixing solutions of the black-and-white and color film and other wash and waste water with high efficiency due to higher sorption capacity, reduce the time of sorption. The proposed method for the recovery of silver is relatively simple and can be used in the production of water and wastewater, including sorption of silver, Department of saturated silver sorbent from the solution, drying, calcination saturated sorbent and smelting of metallic silver from concentrate, characterized in that the sorbent using bis-(dimethylthiocarbamyl)disulfide.

2. The method according to p. 1, characterized in that the sorption of silver is carried out in static mode with a flow rate of 1.5 - 1.6 g of sorbent at 1 g in the silver solution.

3. The method according to p. 1, characterized in that the extraction of silver from wash water and wastewater spend the dynamic mode using the specified sorbent coated on a porous media with large surface, for example on activated carbon with a particle size of 0.5 - 1.5 mm

 

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