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.