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Recuperación de iones de plomo en soluciones acuosas residuales

Resumen

Tipo:
Oferta Tecnológica
Referencia:
TORO20151116001
Publicado:
18/12/2015
Caducidad:
18/12/2016
Resumen:
Una universidad rumana ha desarrollado y obtenido la patente de un nuevo método de recuperación de iones de plomo en soluciones acuosas residuales. El método utiliza ácido oxálico como reactivo de precipitación, que es más económico y accesible. El tiempo de obtención de oxalato de plomo cristalino es considerablemente menor en comparación con el tiempo de precipitación de formas amorfas de las sales de plomo conocidas. La concentración residual de iones de plomo es inferior a 1 mg/L, según la SR ISO 9822. Otra ventaja es la estabilidad química a factores atmosféricos (humedad, calor, luz o dióxido de carbono). Se buscan pymes en las industrias galvánica, eléctrica y relacionadas. La universidad ofrece la licencia y busca socios con el fin de colaborar en el desarrollo de la tecnología.

Details

Tittle:
Recovery of lead ions from aqueous waste solutions
Summary:
A Romanian university has developed and patented an innovative method for the recovery of lead ions from aqueous waste solutions.
The Romanian university is looking for foreign SMEs that are active in the field of industrial processes of the galvanic, electric and related industries.
The Romanian university is offering a license and it is also looking for partners to work together for the further technological development.
Description:
Located in the North-West part of the country, close to the Hungarian border, a Romania university has developed a method for the recovery of divalent lead ions from aqueous waste solutions resulted within the industrial processes of the galvanic, electric and related industries.
The galvanic industry, the electrical and related industries use in an extensive manner the technology of lead electrochemical coating and following this industrial process the result is the emergence of rinse waters with low lead levels, but also waste solutions with high concentrations of lead, for which the treatment and recovery of lead is imposed.
The technical problem solved by the present method relates to set-up of the optimum conditions for the purge of the waste solutions containing divalent lead ions, in concentrations of 40 ... 1000 mg/L PB2+, resulted in the electrochemical processes in nitric acid and sodium nitrate conditions. The goal is both to valorificate the lead as lead oxalate and to solve the problems of environmental quality.
The method for the recovery of lead ions from aqueous waste solutions has the advantage that the aqueous residual solution are treated at room temperature, under mechanical stirring for 10 minutes, with an oxalic acid solution in concentration of 0.5 M, in an excess of 10 ... 22% as compared to the required stoichiometric, at a pH between 4.5 and 5.5. The precipitated lead oxalate is settled, filtered, washed with distilled water, dried at room temperature, finally resulting a 98, 88% yield anhydrous crystalline lead oxalate, which can be subsequently subjected to an operation of low thermal decomposition at a temperature of 320 °C so as to obtain divalent lead oxide.
Having in view the fact that within the industrial processes of the galvanic, electric and related industries one uses extensively the technology of lead electrochemical coating, the Romanian university proposes this method for the recovery of lead ions and is offering a license to foreign SMEs active in the field of industrial processes of the galvanic, electric and related industries; the university is also looking for partners to work together for the further technological development.
Advantages and Innovations:
-the method uses as precipitation reagent the oxalic acid, which is cheap and accessible;
- the time for obtaining the crystalline lead oxalate is considerably reduced as compared to the time corresponding for the precipitation of the amorphous forms of known lead salts;
-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 lead oxalate;
-crystalline and anhydrous form of the recovered product;
-chemical stability to atmospheric factors (humidity, heat, light, carbon dioxide);
-the residual concentration of the lead ions is below 1 mg / L, according to SR ISO 9822;
Stage of Development:
Field tested/evaluated
IPs:
Patents granted
CommeR Statunts Regarding IPR Status:
Patent granted by the national State Office for Inventions and Trademarks.

Partner sought

Type and Role of Partner Sought:
The potential partners could be any SME active in the field of galvanic, electric and related industries interested in a license agreement, so as to use the method for the recovery of divalent lead ions from aqueous waste 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 also be active in the field of industrial water treatment and/ or remediation of contaminated sites.
Concerning the technological cooperation agreement sought, 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:
Si
Languages Spoken:
English

Keywords

Technology Keywords:
10002012 Limpieza de zonas contaminadas
02007010 Metals and Alloys
02002002 Recubrimientos
02002015 Surface treatment (painting, galvano, polishing, CVD, ..)
10004001 Tratamiento de aguas industriales