| Titre : |
De-chroming of chromium shavings without oxidation to hazardous Cr6+ |
| Type de document : |
texte imprimé |
| Auteurs : |
Ján Matyasovsky, Auteur ; Ján Sedliacik, Auteur ; Peter Jurkovic, Auteur ; J. Kopny, Auteur ; Peter Duchovic, Auteur |
| Année de publication : |
2011 |
| Article en page(s) : |
p. 8-17 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Cuirs et peaux
Déchromage
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
After the process of hide tanning to leather, almost 25% weight of input raw material proceeds to chromium tanned waste. The occurrence of such a large amount of waste presents economic and mainly ecologic problem for this industry ; thus substantial global effort is given to development of improved technologies for the disposal of chromium tanned waste. The results of this effort are different technologies whereit is possible to separate chromium from collagen. Application of these procedures in industry and also the proportion of valuation of chromium waste depend on effective application of the separated materials. The aim of our work was development of ecological de-chroming technology of chromium shavings without oxidation of Cr3+ to Cr6+ with retaining acceptable fibril structure. The pH value, temperature and number of dechroming bath have an influence on amount of removed extracted chromium. The influence of these parameters on losses of collagen after hydrolysis was determined. The degree of hydrolytic collagen decay was evaluated by determination of iso-electric point and determination of collagen increased solubility in dependence on de-chroming temperature. The results include optimization of technology; determination of the influence of temperature, pH, quantification of de-chroming released Cr3+ and determined qualitative collagen parameters. |
| En ligne : |
https://drive.google.com/file/d/1yNe0kdPtkg3tzPtvxqxXahgqACiYiJot/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10519 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 1 (01/2011) . - p. 8-17
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De-chroming of chromium shavings without oxidation to hazardous Cr6+ in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 1 (01/2011)
