| Titre : |
Closed-loop liming and chrome tanning systems in full-scale wet blue manufacture, operational management, technical and environmental advantages |
| Type de document : |
texte imprimé |
| Auteurs : |
Richard Daniels, Auteur ; Jiasheng Su, Auteur ; Falei Zhang ; Zhuangdou Zhang |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 418-423 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Chaulage
Cuirs et peaux -- Industrie -- Aspect de l'environnement
Cuirs et peaux de bovins
Tannage au chrome
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Closed-loop liming/unhairing and chromium tanning systems are now established for the full-scale manufacture of bovine wet blue leathers. The technology ensures full recovery and reuse of the concentrated used processing floats, and four major tanneries are now producing some 72,000 hides per week as high quality wet blue leathers from salted American, European and Australian wet salted hides. These are for their own use, sales, and contract tanning.
In practice there are no discharges or washings for effluent treatment from either the liming/unhairing or the acid/salt pickle and chromium tanning processes. Accordingly, there is no chemical wastage from these two major stages within leather making. There are significant saving in processing chemicals – lime, sodium sulfide/hydrosulfide, salt, acids, chromium tanning agents and water too. The problems associated with treating waste waters from these two environmentally difficult stages are thus totally avoided.
Based on independent on-site surveys within each of these four tanneries, this paper shows how the technology is managed in practice. In particular it shows how the process stabilizes within these processing loops, and how a continuous increase in neutral salts is avoided. |
| Note de contenu : |
- METHODOLOGY : Technology : liming and hair recovery stage - Technology : pickling and chromium tanning stage - Mechanisms within the liming cycle - Mechanisms within the chromium tanning cycle
- RESULTS AND DISCUSSION : Advantage : environmental - Advantage : chemical and water use - Advantage : technical and product |
| En ligne : |
https://drive.google.com/file/d/1vnlgfoHazxbL60R9mIfp4FlJs9Hd2Sm7/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31402 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 12 (12/2018) . - p. 418-423
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Closed-loop liming and chrome tanning systems in full-scale wet blue manufacture, operational management, technical and environmental advantages in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 12 (12/2018)
