| Titre : |
Conservation of chromium in the tanning industry |
| Type de document : |
texte imprimé |
| Auteurs : |
Jean J. Tancous, Auteur ; R. Bellingham, Auteur ; Waldo E. Kallenberger, Auteur ; A. McDonell, Auteur |
| Année de publication : |
1981 |
| Article en page(s) : |
p. 164-175 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Chromium can be recovered from wet-blue offal trimmings and shavings with substantial saving in chemicals by incineration at 600°C for 5 hr. Pretreating the offal with 0.5 M Na2CO3 and air-drying prior to incineration produced CrO4(2-). The ash obtained by simply incinerating the offal, without pretreatment, contained water-insoluble Cr2O3, which was purified by leaching with water. Chromium and crude protein were extracted efficiently from offal using 5 percent NaIO3, 5 percent H2SO4, and 3 percent NaCl at 40°C. This procedure was effective but expensive. Leather satisfactory as to odor, appearance, and shrinkage temperature was made with chromium recovered from wet-blue offal by incineration and by extraction. Chromium conservation is possible by recycling chromium liquors and by precipitating the chromium from spent tanning liquors before they are combined with other tannery wastes. If the wastes are combined first, other contaminants are introduced that make chromium recovery and reuse difficult. Leaching sludges with H2SO4 produced marginal chemical cost gains. Leather tanned with these solutions had satisfactory shrinkage temperature, but the sludge odors and iron contamination were objectionable. |
| Note de contenu : |
- Material balance data for offal
- Recovery of chromium from offal by extraction
- Recovery of chromium from offal by incineration
- Recovery of chromium from wastewater sludges by extraction |
| En ligne : |
https://drive.google.com/file/d/1pEyRiFVYnS10c-FDaW1wehFc1MPdF7rF/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17599 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXVI (Année 1981) . - p. 164-175
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Conservation of chromium in the tanning industry in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
