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Title: Use of ultrasound in chrome recovery process in leather industry
Authors: Sivakumar, V
Verma, V Ravi
Swaminathan, G
Rao, P G
Keywords: Chrome recovery
Issue Date: Jul-2007
Publisher: CSIR
IPC CodeC14C3/00
Abstract: In this study, the influence of ultrasound on the stoichiometric use of precipitating agent magnesium oxide, (MgO) as an alkali in the recovery of chrome from the spent tanning liquors has been studied. The use of MgO in chrome recovery assists settling characteristics but suffers from low solubility and reactivity. A significant improvement (3-fold) is observed in settling rate of chromic hydroxide precipitate with the use of pre-sonicated MgO as compared to control (no sonication). A considerable decrease of Cr in the supernatant liquor after precipitation suggests better recovery due to better dispersion and particle-size reduction of MgO in water due to sonication. No appreciable improvement with sonicated sodium carbonate solution prior to chrome recovery may be due to sodium carbonate itself is highly water soluble in comparison to MgO.
Page(s): 545-549
ISSN: 0022-4456
Source:JSIR Vol.66(07) [July 2007]

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