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Hazardous jarosite use in developing non-hazardous product for engineering application

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Field Value
 
Title Hazardous jarosite use in developing non-hazardous product for engineering application
 
Creator ASOKAN, PAPPU
SAXENA, MOHINI
ASOLEKAR, SHYAM R
 
Subject fly ash
clay
recycling
sintering
 
Description Jarosite released from zinc metal extraction process is hazardous in nature and its world wide disposal has become a major environmental concern. In this study, an attempt has been made to immobilise and recycle the jarosite released from Hindustan Zinc Limited, India, using CCRs, so called fly ash, and clay soil. Results revealed that the particle size of jarosite was finer than that of CCRs and had higher porosity and water holding capacity due to fine textured materials resulting in high surface area (10,496.18 ± 30.90 cm2/g). Jarosite contain higher concentration of toxic elements (lead, zinc, sulphur, cadmium, chromium and copper) than that of CCRs. Concentrations of radionuclides such as 226Ra, 40K and 228Ac in jarosite found less than in CCRs are similar to that of soil. Statistically designed experiments on solidified/stabilised (s/s) sintered jarosite–CCRs products confirmed that the compressive strength of jarosite bricks reached as high as 140 kg/cm2 with 14.5% water absorption capacity at the combination of 3:1 ratio of jarosite and clay, respectively, but, concentrations of all the toxic elements recommended by United States Environmental Protection Agency (USEPA)–Toxicity Leachate Characteristics Procedure (TCLP) standard are not within the permissible limits. However, it is confirmed that the toxic elements leaching potentials of s/s-sintered products developed using 2:1 jarosite clay ratio with 15% CCRs comply with the USEPA–TCLP limits and also meet the quality for engineering applications.
 
Publisher Elsevier
 
Date 2009-09-19T07:26:52Z
2011-11-25T15:29:09Z
2011-12-26T13:05:07Z
2011-12-27T05:51:13Z
2009-09-19T07:26:52Z
2011-11-25T15:29:09Z
2011-12-26T13:05:07Z
2011-12-27T05:51:13Z
2006
 
Type Article
 
Identifier Journal of Hazardous Materials 137(3), 1589-1599
0304-3894
http://dx.doi.org/10.1016/j.jhazmat.2006.04.054
http://hdl.handle.net/10054/1648
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1648
 
Language en