[article]
| Titre : |
Recycling of unhairing lime liquors |
| Type de document : |
texte imprimé |
| Auteurs : |
K. Eldin A. Mohamaed, Auteur ; G. A. Gasmelseed, Auteur |
| Année de publication : |
2003 |
| Article en page(s) : |
p. 116-118 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Chaulage
Chaux Sulfurée
Cuirs et peaux -- Analyse
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux de moutons
Déchets industriels -- Recyclage
Eaux usées -- Analyse
Eaux usées -- Recyclage
Epilage
Produits chimiques -- Consommation -- Réduction
Recyclage (déchets, etc.)
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
This study concerns the re-cycling of used sulphide-lime unhairing liquors in order to reduce pollution, save fresh water and minimize the cost of the liming process. Chemical analyses of the used liquor indicated that a considerable amount of sulphide (2100 mg/l) was present. As lime has a limited solubility (0.125%), un-dissolved lime is always present. This un-dissolved lime will dissolve when its equilibrium solubility is disturbed by recycling. It has been observed that the unhairing power of an old lime liquor was greater than that of a fresh liquor Wet salted sheepskins were processed according to the normal recipe and the once-used lime solution was analysed for lime and sulphide content, its composition was adjusted with a make-up fresh lime-sulphide liquor and recycled. The same was repeated for eight cycles, each time the recycled liquor analyses were adjusted with a fresh make-up.
The average savings were 65% sodium sulphide, 33% lime and 90% water. The limed-unhaired pelts from each cycle were further processed through tannage, retannage, drying, and finishing. The physical and chemical properties were satisfactory. The leather produced is normal, soft, of good tensile strength, full and of good quality.
We recommended this process to all tanneries, its application is simple. It requires a collection pit, a filter, a pump and a pipeline to and from the drums. |
| Note de contenu : |
- Micro scale trials
- Semi- production scale trials
- Table 1 : Analyses of fresh and used lime-sulphide liquors
- Table 2 : Total residual amounts of sulphide, lime and pH of recyled liquors
- Table 3 : Comparison of recycling and conventional method
- Table 4 : Degree of swelling and efficiency of unhairing
- Table 5 : Comparsion of recycling and conventional unhairing method
- Table 6 : Chemical analyses of leather
- Table 7 : Physical properties of leather |
| En ligne : |
https://drive.google.com/file/d/141rhLzXxhN-BortNESxQ76VLxxozlvfy/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39788 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 87, N° 3 (05-06/2003) . - p. 116-118
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Recycling of unhairing lime liquors in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 3 (05-06/2003)
