[article]
| Titre : |
Processing chrome tanned solid waste generated in the leather industry : recovery of proteins and synthesis of a pigment for paint |
| Type de document : |
texte imprimé |
| Auteurs : |
Soufiane Tahiri, Auteur ; M. Azzi, Auteur ; A. Albizane, Auteur ; A. Messaoudi, Auteur ; M. Bouhria, Auteur ; A. Sibari, Auteur |
| Année de publication : |
2001 |
| Article en page(s) : |
p. 1-8 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Between the beginning of the tanning of the skins and the delivery of finished leather articles, there is a series of operations that produce a significant quantity of waste. Unfortunately, this waste is only very little reused. Environmental concerns and escalating landfill costs have prompted environmentalists, scientists and research people to look for ways to convert this waste material into more valuable co-products. The objectives of this study are to: evaluate the quantity of wastes generated by the operations involved in the transformation of hides into leather, and revalue the most significant category of tanned wastes, namely chrome shavings and tanned splits. The quantitative study of solid waste showed that the tanning industry produces a high percentage of waste (about 38 percent of the weight of salted hides). The alkaline digestion of tanned waste with calcium hydroxide allows the separation of the proteins and the metallic salts. The proteins are in the aqueous phase and the metallic salts in the solid phase. Solid proteins are recovered after lyophilization of the liquid. The solid residue is incinerated under precise conditions of temperature with a large initial exess of oxygen in order to oxidize the trivalent chromium and transform them into hexavalent state. The dissolution of recovered ash by a dilute solution of nitric acid allows regeneration of a concentrated bichromate solution whose chromium is recovered in the form of solid yellow chromate by the reactions of complexation and precipitation using a solution of lead(II) nitrate. The crystal structure of the precipitate was identified by x-ray diffraction. |
| En ligne : |
https://drive.google.com/file/d/1MNl7rndwZz2-1P_IBsTMF7BdvmeTET7U/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4399 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 1 (01/2001) . - p. 1-8
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