Efficiency of a novel physical method to remove chromium from spent-chromeliquor

Citation
B. Chattopadhyay et al., Efficiency of a novel physical method to remove chromium from spent-chromeliquor, J AM LEATH, 95(8), 2000, pp. 278-286
Citations number
34
Categorie Soggetti
Material Science & Engineering
Journal title
JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION
ISSN journal
00029726 → ACNP
Volume
95
Issue
8
Year of publication
2000
Pages
278 - 286
Database
ISI
SICI code
0002-9726(200010)95:8<278:EOANPM>2.0.ZU;2-G
Abstract
Physical means such as high temperature and pressure are observed to be eff ective to separate out chromium both from BCS solutions and from spent-chro me liquor containing varying concentrations of chromium. Mean Cr removal va lues ranged between 32.4% and 85.3%. In most cases significant negative cor relations between initial Cr concentration and removal percentage were comp uted (r values ranged between -0.4519 to -0.9860 at p<0.05). Between pH 3.0 and 4.5, within which the pH of spent Cr liquor usually lies, Cr removal e xhibited positive correlations with pH. At a very high concentration range of 6028.2 to 6091.5 (mean 6054.5 mg l(-1)), however, the correlations were insignificant. Between pH 3.0 and 4.5, positive correlations albeit weak, b etween temperature, and time (duration) were recorded. Under the present ex perimental conditions, at mean concentration of 709.57 mg l(-1), temperatur e 114.7 degrees C, pH 3.73 and duration of 28.3 minutes, an average Cr remo val of 58.8 % against the initial Cr concentration of the liquor is very mu ch encouraging.