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Tratamiento de recuperación de iones de plata en soluciones residuales

Resumen

Tipo:
Oferta Tecnológica
Referencia:
TORO20161003001
Publicado:
10/11/2016
Caducidad:
10/11/2017
Resumen:
Un equipo de investigación de una universidad rumana ha desarrollado y patentado un método innovador para el tratamiento y recuperación de iones de plata en soluciones residuales. Este método evita las desventajas de los métodos comunes y permite obtener oxalato anhidro de plata con una eficiencia del 97,45%. Sus principales ventajas son las siguientes: 1) la velocidad de decantación, filtración y lavado del precipitado es superior si se compara con las formas amorfas utilizadas en otros métodos, 2) el volumen del precipitado cristalizado se reduce considerablemente, 3) alta pureza del producto recuperado, 4) forma cristalina del producto recuperado y 5) estabilidad química a factores atmosféricos (humedad, calor, luz y dióxido de carbono). El equipo de investigación busca pymes y socios industriales interesados en establecer acuerdos de licencia y cooperación técnica para continuar con el desarrollo.

Details

Tittle:
Method of recuperative treatment of the silver ion from residual solutions
Summary:
A research team from a Romanian university has developed and patented an innovative method for the recuperative treatment of the silver ions from residual solutions. The method solves the disadvantages of the common used methods and results in obtaining anhydrous silver oxalate with an efficiency of 97.45%
The research team is looking for foreign SMEs/ industrial partners interested in license agreements and technical cooperation agreements for the further technological development.
Description:
Located in the North-West part of the country, close to the Hungarian border a research team from a Romanian university has developed a method for the recuperative treatment of silver ions from residual solutions resulted within the industrial processes.
Within the engineering industry, the electrical and other related industries, during the technology of manufacturing passive electronic components (e.g. disk ceramicons and plaque ceramicons), it also results a certain percentage of rejected ceramicons, which have on their surface metallic silver covered with polymer resin.
Although there are different methods to extract the silver ions from residual solutions via chemical precipitation processes, in amorphous forms, using classical precipitation agents (e.g. Na2CO3, NaOH and chlorides), with or without chemical coagulation and flocculation (with aluminum and iron salts), all those procedures have some notable disadvantages. Therefore, the present method solves some technical problems related to set-up of the optimum conditions for the treatment of the residual solutions containing 3...5 g AgNO3/L, resulted in the treating processes of ceramicons in HNO3 35% conditions. The goal is both to salvage the silver oxalate and to solve some the environmental quality problems.
The present method is to be taken into consideration for it solves the disadvantages of the common used methods, based on the fact that the residual solution resulted after the treatment process of ceramicons with azotic acid 35% is now subjected to a mechanical stirring (for 10 minutes at 20 °C) with a solution of oxalic acid in concentration of 0.5 M (in an excess of 100 % as compared to the required stoichiometric of the precipitation reaction) at a pH of the aqueous silver nitrate solution between 5 and 5.5. Thus, after the decantation, filtration, washing and drying at ambient temperature, one obtains anhydrous silver oxalate with an efficiency of 97.45%
Having in view the fact that within the industrial processes the resulting residual solutions contain silver ions, the Romanian research team proposes this method for the recovery of silver ions and is offering a license to foreign SMEs and/ or industrial partners active in the field of engineering, electrical and related industries; the Romanian research team is also open for further technological development with potential interested partners.
Advantages and Innovations:
The present method has the following main advantages:
-decantation, filtration and washing speed of the precipitate are superior as compared to the amorphous forms used within other methods;
-considerable reduced volume for the crystallized precipitate;
-high purity of the recovered product;
-crystalline form of the recovered product;
-chemical stability to atmospheric factors (humidity, heat, light, carbon dioxide).
Stage of Development:
Field tested/evaluated
IPs:
Patents granted
CommeR Statunts Regarding IPR Status:
Patent granted by the State Office for Inventions and Trademarks. IP rights on national level - Romania.

Partner sought

Type and Role of Partner Sought:
The potential partners could be any SME and/ or industrial partners active in the field of engineering industry, electrical industry and related industries interested in a license agreement, so as to use the method for the recuperative treatment of silver ions from residual solutions resulted within the industrial processes and thus preserving the environment.
Having in view the positive impact of this method on the environment, the potential partner could be active in the field of industrial water treatment and/ or remediation of contaminated sites.
Concerning the technical cooperation agreement sought, the Romanian research team would also like to find a foreign partner for the further technological development, by improving the existing method.

Client

Type and Size of Client:
University
Already Engaged in Trans-National Cooperation:
No
Languages Spoken:
English

Keywords

Technology Keywords:
10002011 Contaminación del terreno y de aguas subterráneas
10002012 Limpieza de zonas contaminadas
10004003 Reciclaje de aguas residuales
10004006 Tratamiento / eliminación de lodos
10004001 Tratamiento de aguas industriales