A kind of degumming agent for photosensitive waste film and its application and reusing method of degumming agent

Abstract

The invention belongs to the field of hazardous waste treatment in the environmental protection industry, and concretely relates to a photographic waste film degumming agent, and a preparation method, an application and a reuse method thereof. The photographic waste film degumming agent comprises an alkali solution, a penetrating agent and a dispersant, and the penetrating agent and the dispersant are used together in an alkaline environment to effectively separate a film base and a silver halide layer. The preparation method of the degumming agent has the advantages of simplicity and easily available raw materials. The invention also provides the application of the degumming agent. The application comprises the following steps: placing a photographic waste film in the degumming agent, and heating the photographic waste film and the degumming agent to 35-40 DEG C in order to realize the degumming; and electrolyzing the obtained degumming waste liquid to remove silver. The application has the advantages of short time, high efficiency, obtaining of the clean film base, and solving of a problem that the photographic waste film used at present cannot be degummed due to complex structure and components. An electrolytic waste liquid obtained after electrolysis sliver removal is regenerated to obtain a regenerated degumming agent, and the regenerated degumming agent can be used multiple times and has good degumming effect; or the electrolytic waste liquid undergoes oxidation catalysis treatment to reach discharge standards.

Description

technical field [0001] The invention belongs to the field of hazardous waste treatment in the environmental protection industry, and in particular relates to a degumming agent for photosensitive waste film, an application thereof and a method for reusing the degumming agent. Background technique [0002] Photosensitive material waste is hazardous waste identified in the "National Hazardous Waste List", and the hazardous waste category is HW16. [0003] The so-called photosensitive material waste refers to the waste generated from the production, preparation and use of photographic chemicals, hospital imaging departments, and chemical photosensitive raw materials, mainly including waste developing (fixing) solution, waste film, waste photographic paper and scrap photosensitive raw materials. If these wastes are not disposed of properly, they will not only seriously pollute water bodies and soil, but also endanger human health. [0004] At present, silver halide photosensitiv...

AI Technical Summary

Problems solved by technology

First of all, the degumming treatment temperature is 150°C, which changes the physical and chemical properties of the essential component ethylene glycol, making it difficult to reuse the degumming agent and increasing the difficulty of subsequent filtration treatment; secondly, this method burns the coating slurry at high temperature and only recovers the slurry Zhongyin, the silver in the clarified solution cannot be recovered; again, the degumming reaction and high temperature burning temperature are high, the energy consumption is large, and air pollution problems are caused

[0011] In recent years, with the development of photosensitive materials, the color photosensitive film used in modern times has a more complex structure than the previous black and white photosensitive film. It is composed of ten layers of emulsifier layer and spacer layer. The thickness of the emulsion layer is close to 30 microns. The total thickness of the dry film is close to 24 microns, resulting in strong adhesion and high firmness between the layers; among them, the emulsifier layer also contains organic compounds with very complex molecular structures such as color couplers (color formers), which are treated with strong acid or heated ethyl alcohol. The diol alkali solution is difficult to effectively separate the emulsifier layer and the film base in the photosensitive material waste, and it is impossible to obtain a clean film base. At the same time, the degumming waste liquid also contains more complex components, making it more difficult to remove silver. Moreover, the waste generated during the treatment process is also difficult to meet the environmental discharge standards

[0012] For the traditional incineration method, nitric acid method, hot ethylene glycol separation method and other disadvantages of large dosage, high energy consumption and difficult recovery of film base and silver when processing photosensitive waste film, as well as the complex structure of color photosensitive film resulting in emulsifier layer and sheet Based on the new problem that is difficult to separate, it is necessary to explore and find a new degumming method for photosensitive waste film with good separation effect, low cost, and no secondary pollution, and a waste treatment method after degumming, which has become a major technical problem to be solved in this field.

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