SU1282065A1 - Method of restoring cine film - Google Patents

Abstract

The invention relates to the processing of cinema photo wastes from lavsan basis. In order to increase the degree of silver recovery and simplify the technology during film regeneration on polyethylene terephthalate base, it is held in water at 60-75 C for 10-20 minutes, heated after adding 0.8-1.9% sulfuric acid at a rate of heat 0.5-1.5 C / min to 85-97 0 and hold at these temperatures for 1-10 minutes When processing films of sulfuric acid, an additional 0.02-0.03 g / l of octyl decyl or sodium lauryl sulfate is added. Then the acid treatment filtrate is fed to the precipitation and silver precipitation by one of the known methods. 3 hp f-ly, 1 tab. (L

Description

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1-1282065

This invention relates to recycling film films.

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The purpose of the invention is to increase the stent. The content of surfactants for silver extraction and the simplification of substances: octyl, decyl or lauryl technology during regeneration of kinetic photo-5 sodium sulfate in an acidic medium is set in the range of 0.02-0.03 g / l. Less content is not enough

polyethylene terephthalate based tapes.

Preliminary ribbon holding is recommended to be carried out in water at 60-75 ° C for 10-20 minutes. A nag emulsion, (part of the working layer is lower than before, and remains on the basis with silver), a time less than 10 minutes is not enough 0.03 g / l to achieve

for complete removal of the film films from the base, the silver film contains the desired swelling of the silver-containing gelatin layer, which is then removed by acid treatment. Part of the emulsion after the final treatment remains on the basis of: the recovery of silver to waste is reduced. Heating up to a treatment time of 20 minutes is sufficient to achieve a positive effect.

The choice of concentrations of an aqueous solution of sulfuric acid (0,) is due to the fact that at

25

surfactant

(preferably sodium decyl sulfate), up to 95 ° C with a heating rate of 1.5 ° C / min and held at this temperature for 10 minutes.

Example 1. A capacity of 1.2 m lined with an acid-resistant material is loaded with 80 kg of an unbroken film tape on polyethylene terephthalate base. Poured

a lower concentration of a portion of the gelatin layer with silver remains on the base, thereby reducing the recovery of silver to waste. A concentration of 1.9% is sufficient to achieve a positive effect, about

It is recommended to heat the film photo-tape in acidic medium to 85-97 ° C. Heating to a lower temperature-: the rounds does not ensure complete removal of silver-containing gelatin from the base- 35 1 ton of warm water heated to 65 ° C of the new layer, part of the silver remains stirred for 15 minutes. . based. Heating to 97 ° C is sufficient. Stop stirring and pour saline to achieve a positive effect of 15 kg of concentrated sulfuric acid. Acid (a 1.5% solution is formed (temperature reached 40 thief), after which stirring is completed. values) are recommended and start raising the temperature at a rate of 0.5-1.5 ° C / min. At a speed greater than 1.5 ° C / min, there is not enough time for the working layer to peel off sufficiently from the base, 45 which results in the silver remaining on the base. A speed of 0 C / min is sufficient to achieve a positive effect. Lower speed

heat at a heating rate of l C / min until reaching 91 ° C. The heating is turned off and the contents of the tank are held at this temperature and with stirring for 3 minutes. The pulp of the acidic solution is drained and for 6-7 minutes the base is washed in running warm water, heated to 60 brakes process of separation, increased to 50–70 ° C. The stirring is stopped.

time of processing, contributes to the resorption of gelatin on the base, therefore, partial loss of silver can occur.

Cine-holding time in acidic medium; at 85-97 ° C should be 1-10 minutes. . Shorter time is not enough to completely remove silver, waste is added to the filtrate for 10 minutes in a special container, after which washing is continued with basic water in warm water for 5-6 minutes. The basis is unloaded and dried. 55 Acid treatment filtrate and

the washings after the first wash are supplied. to precipitate and release silver by one of the known methods, for example, the pulp is neutralized by hydro

exactly to achieve a positive effect.

emulsion, (part of the working layer with silver remains on the base), 0.03 g / l is enough to achieve

for complete removal of silver-positive effect film films from the base.

It is preferable to hold the unwound film films on a lavsan basis in the form for 15 minutes, then heat in 1.5% Nd50 to 91 C with a heating rate of 1 C / min and hold at this temperature for 3 minutes.

The film films are preferably kept at 75 ° C for 15 minutes, then heated in 1.5% H.SO. containing 0.03 g / l.

surfactant

(preferably sodium decyl sulfate), up to 95 ° C with a heating rate of 1.5 ° C / min and hold at this temperature for 10 minutes.

Example 1. A capacity of 1.2 m lined with an acid-resistant material is loaded with 80 kg of an unbroken film tape on polyethylene terephthalate base. Poured

Claims (5)

1 ton of warm water, heated to 65 ° C, is stirred for 15 minutes. . Stop stirring and pour 15 kg of concentrated sulfuric acid (a 1.5% solution is formed), after which stirring is started and the temperature starts to rise. heat at a heating rate of l C / min until reaching 91 ° C. The heating is turned off and the contents of the tank are held at this temperature and with stirring for 3 minutes. The pulp of the acidic solution is poured and for 6-7 minutes the base is washed in running warm water, heated to 60CLs the filtrate in a special container, and then the base is washed in warm water for 5-6 minutes. The basis is unloaded and dried. Acid treatment filtrate and after the first washing, the washing waters supply silver for precipitating and isolating with one of the known methods, for example, the pulp is neutralized with alkali metal hydroxide to pH, boiled for 15-20 minutes with Universal bleach added to neutralize, or HC1 to pH 3.5-4 , 0. The precipitate is filtered off and dried. five Example 2. The processing of the film phototape on a polyethylene terephthalate basis is carried out in the same way as in Example 1. The difference is that the waste is poured with water heated to 63 ° C and the mixing is carried out for 17 minutes, then the container is fed 18 kg of concentrated sulfuric acid (a 1.8% solution is formed) are heated to a rate of -5 1, 2 C / min and at this temperature the contents of the tank are held for 1 minute. Example 3. Processing served on the deposition of silver and in excess of one of the known methods. Example 5. The processing of the developed film phototape on a polyethylene terephthalate basis is carried out in the same way as in Example 4. The difference is that the waste is poured with water, heated to 60 ° C, stirred for 20 minutes, then 19 kg of concentrated sulfuric acid (a 1.9% solution is formed) and 30 g of sodium octyl sulphate are added. Heating to 97 ° C is carried out at a rate of G C / min and at this temperature the contents of the tank are held for 8 minutes. Information on the processing of film clips. in the proposed conditions are given in the table, it also presents the polyethylene terephthalate cinema photo-tape-20, when processing a tape on a parameter basis, is carried out in the same way as in example 1. The difference is in that. That the waste is poured with water heated to 68 or 70 ° C, stirring is carried out respectively for 13 or 10 minutes (table), then 10 or 8 kg of concentrated sulfuric acid are loaded into the container, respectively (1.0 or 0.8% solution is formed) heated to 95 or 96 ° C, respectively, at a rate of 0.7 or 0.5 C / min, and at this temperature the contents of the tank are held for 5 or 9 minutes. Example 4. A capacity of 1.2 m is loaded with 80 kg of developed film cling film on polyethylene terephthalate basis. Pour 1 ton of water, heated to, and stir for 15 minutes. Stop the pan temperature for 8 minutes. 3. The method according to claim 1, about 1 hour; mixing, pour 15 kg of concentrate, then heat in 1.5% sulfuric sulfuric acid (the acid is formed up to 1.5% aqueous solution at a heating rate) and pour in 155 s / min and hold with ucaean-20 g of sodium decyl or lauryl sulfate (0.02 g / l), after which the stirring is started and the temperature begins to rise to -45 D and and c. so that, for the purpose of propagation with a heating rate of 1.5 C / min of its transmission to the developed films, up to 95 ° C. Heating off the phototape, an additional 0.02-0.03 g / l is introduced into the solution of sulfuric acid and the contents of the tank are held in an additional 0.02-0.03 g / l for 10 minutes. Acid solution and sodium pulp are drained. washing is performed for 6-7 minutes 4. The method according to p. o OR decyl, or laurylsulku base in warm running water, heated to 60-70 C. Stop stirring, pour the filtrate into 3, differing from the fact that the tape was kept in water for 15 minutes, then the collection tank was heated in a 1., 5% sulfuric acid, followed by continuous acid containing 0.03 g / l decyl- The base is washed in warm sodium sulfate water, up to 95 ° C at a rate of 5-6 minutes. The basis is unloaded and dried. heating 1.5 C / min and maintained at The acid treatment filtrate and the specified temperature during the washings after the first wash for 10 minutes. served on the deposition of silver and in excess of one of the known methods. Example 5. The processing of the developed film photo-tape on poly-ethylene terephthalate basis is carried out in the same way as in example 4. The difference is that the waste is poured with water, heated to 60 ° C, stirred for 20 minutes, then 19 kg of concentrated sulfuric acid (a 1.9% solution is formed) and 30 g of sodium octyl sulphate are added. Heating to 97 ° C is carried out at a rate of G C / min and at this temperature the contents of the tank are held for 8 minutes. Data on the processing of film films under the proposed conditions are given in the table, it also presents the races different from those proposed. Claim 1. Inventory film regeneration method, which includes soaking in water and an aqueous solution of sulfuric acid, characterized in that, in order to increase the degree of silver recovery and simplify the technology during film film regeneration on a polyethylene terephthalate base, the tape is kept in water at 60-75 0 for 10-20 ffln, then heated to 0, D, - 1.9% sulfuric acid up to 85-97 G at a speed of 0.5-1.5 sec / min and kept at the specified temperature for 1-10 minutes, 2. The method according to p. 1, about tl and h and u and with the fact that withstand the tape boiled in water at 65 ° C for 15 min Noah temperature for 8 min. 3. The method according to p. 1, about t h and yuzatem is heated in 1.5% sulfuric acid to a heating rate of 155 s / min and hold with uca-D and c. By the fact that, in order to spread it to the film films, an additional 0.02-0.03 g / l is introduced into the solution of sulfuric acid The mixture is heated to 1.5% sulfuric sulfuric acid at a rate of heating of min and is held at water level. By the fact that, in order to spread it to developed films, an additional 0.02-0.03 g / l is added to a solution of sulfuric acid. atri. manual on a OR decyl, or laurylsulPri pre-Unrepresented