| Titre : |
Factors influencing chromium recovery from chromium sulphate tanned leather scrap ashes |
| Type de document : |
texte imprimé |
| Auteurs : |
S. Carneiro, Auteur ; M. F. Almeida, Auteur ; M. F. Ferreira, Auteur |
| Année de publication : |
2003 |
| Article en page(s) : |
p. 1-10 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Cendres -- Teneur en chrome
Chrome -- Recyclage
Cuirs et peaux
Déchets industriels -- Recyclage
Incinération
Tannage -- Déchets
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Basic chromium salt is the main tanning reagent used all over the world and it represents one of the most important applications of chromium salts. When leather scrap tanned with chromium sulphate is burned, the respective ashes contain meaningful amounts of chromium, some of it in the hexavalent form.
This paper presents some efforts aimed at using the ashes from a fixed grate incinerator (FGI) as a source of chromium for various applications. Two types of ashes were characterised. Several tests with mixtures of alkaline and alkaline earth fluxes followed by hot washing the product were carried out to recover chromium from the ashes. The factors influencing chromium recovery were screened through an experimental design approach and hypothesis testing. Using ashes as pigment for ceramic glazes was also evaluated. |
| Note de contenu : |
- CHARACTERISATION OF ASHES AND EXPERIMETNAL PROCEDURES : Principles of the experimental process
- RESULTS AND DISCUSSION : First set of experiments - Second set of experiments - Third set of experiments - Fourth set of experiments
- Table 1 : Experiments carried out at 750°C with NA2CO3 based mixtures and respective Cr recoveries
- Table 2 : Experiments carried out at 350, 450 and 550°C with mixtures based on NaOH
- Table 3 : Cr recoveries at 350, 450 and 550°C with mixtures based on NaOH
- Table 4 : Experiments carried out at 350, 450 and 550°C with mixtures based on NaOH and NaNO3 |
| En ligne : |
https://drive.google.com/file/d/19Zv2OsYHHMm0WjcPxW4ash70Z_iVjqG8/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39804 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 87, N° 1 (01-02/2003) . - p. 1-10
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