Clean technology - supernatant recirculation after separation of chromium / K. Kosinska in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 4 (07-08/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 4 (07-08/2009) . - p. 145-147 Titre : Clean technology - supernatant recirculation after separation of chromium Type de document : texte imprimé Auteurs : K. Kosinska, Auteur ; Barbara Felicjaniak, Auteur ; B. Zaczek, Auteur ; M. Urbaniak, Auteur Année de publication : 2009 Article en page(s) : p. 145-147 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The research was aimed at the decrease of sewage salinity. The aim was to be achieved by means of recirculation, i.e., technological reuse of chromium-free pickling/tanning baths (supernatant). Supernatant was used inpickling/tanning process of hides. Before the subsequent use chlorides were supplemented. In the paper the number of technological cycles that can be carried out without any damage to the quality of hides has been determined. The resutls have been compared with results achieved in traditional technology, without the use of recirculation. After subsequent recirculation cycles, the supernatant was assessed by the following factors : chlorides, sulphates, general chromium, Kiejdahl general nitrogen, organic nitrogen, chemical oxygen demand (COD), 5- day biological oxygen demand (BOD5). The quality of hides was assessed in wet blue and crust semi-finished products. It has been found that supernatant recirculation in chromium pickling/tanning of hides is fully possible and it does not lower the quality of hides. After eight recirculations the general consumption of sodium chloride decreased by about 45 % compared with the amound used in traditional hide pickling process. En ligne : https://drive.google.com/file/d/18jFtJl8Pbh2brOLWYWHmPjAzV19Se0xp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6104 [article]

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Studies on the application of recovered chromium in chrome tanning / J. R. Rutkowski in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 82, N° 3 (05-06/1998)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 82, N° 3 (05-06/1998) . - p. 114-116 Titre : Studies on the application of recovered chromium in chrome tanning Type de document : texte imprimé Auteurs : J. R. Rutkowski, Auteur ; K. Kosinska, Auteur ; M. Urbaniak, Auteur Année de publication : 1998 Article en page(s) : p. 114-116 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Research work was carried out on recovered chrome tannin application in the processing of unsplit cattls hide tanning. In these experiments 20-80 % of "Regenerate" was used in individual trials of tannings with chromal. Taking into consideration the tannin content in spent tanning floats from tanning trials with a changing share of "Regenerate", statement can be made that with an increase in the "Regenerate" share, negligible deterioration of its exhaustion occurs. The general content of tannin in wet-blue from tanning trials with different shares of recovered chrome liquor remains on the level of 4.0-4.4 % Cr2O3 and shows a falling tendency with the increasing share of "Regenerate". In additiona disadvantageous effect of a different tannin distribution in the cross-section of the leather was confirmed. The content of CrO3 in the middle layer decreases with the increase in the "Regenerate" share. Distinct deterioration of both indicators, i.e. total chromium content and its distribution in the layers of the leathers tanned exclusively with "Regenerate" was observed. The physical test results of garment leather and footwear leather showed that all the leathers from tanning trials with a partial use of "Regenerate" comply with the Polish Standards for the parameters needed for quality leathers. Each time the leathers tanned with 100 % "Regenerate" stood out from the others : garment leather with the highest tear strength values and the lowest elongation, footwear leather with the lowest strength values, the lowest extension at burst and the lowest elongation at break. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7905 [article]

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