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Removal of iron oxides in Meetiyagoda kaolin by chemical leaching to improve whiteness

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dc.contributor.author Azarudeen, MHM
dc.contributor.author Piranavan, S
dc.contributor.author Krishnakumar, S
dc.contributor.author Senanayake, IP
dc.contributor.author Rohitha, LPS
dc.contributor.author Weerawarnakula, S
dc.contributor.editor Hemalal, PVA
dc.date.accessioned 2022-07-26T09:46:08Z
dc.date.available 2022-07-26T09:46:08Z
dc.date.issued 2016-07
dc.identifier.citation Azarudeen, M.H.M., Piranavan, S., Krishnakumar, S., Senanayake, I.P., Rohitha, L.P.S., & Weerawarnakula, S. (2016). Removal of iron oxides in Meetiyagoda kaolin by chemical leaching to improve whiteness. In P.V.A. Hemalal (Ed.), Proceedings of the ERE 2016 Annual Conference on Earth Resources Management (pp. 47-53). Department of Earth Resources Engineering, University of Moratuwa. en_US
dc.identifier.uri http://dl.lib.uom.lk/handle/123/18473
dc.description.abstract Industrial grade Kaolin deposits in Sri Lanka are located in Boralesgamuwa and Meetiyagoda. Two distinct grades of Kaolin are produced at Meetiyagoda refinery, based on the whiteness index (WI). The presence of iron oxides significantly affects the WI of the Kaolin. Upgrading of the whiteness will result in a huge increase in the product prices as high as 35%. However, no effective methods are currently in place for the whiteness improvement at Meetiyagoda Kaolin refinery. Hence, this study was carried out to assess the whiteness enhancement capability of Meetiyagoda Kaolin by chemical leaching process using oxalic and citric acids. The treatment time (0–120 min) in steps and concentration of acids (0.01, 0.1, 0.2, 0.3, 0.4 and 0.5 M) were considered as the main variables of this study. Leachate and treated samples were analysed by using spectrophotometric and XRF methods respectively. The results depict that the oxalic acid is more effective in leaching iron oxides from Kaolin compared to citric acid for the Kaolin at Meetiyagoda. It was observed that 25% and 14% of Fe in Kaolin filter cakes can be removed by 0.4 M oxalic and 0.5 M citric acid respectively, within a treatment time of 120 mins at the room temperature. en_US
dc.language.iso en en_US
dc.publisher Department of Earth Resources Engineering en_US
dc.subject Citric acid en_US
dc.subject Kaolinite en_US
dc.subject Oxalic acid en_US
dc.subject Whiteness index en_US
dc.title Removal of iron oxides in Meetiyagoda kaolin by chemical leaching to improve whiteness en_US
dc.type Conference-Full-text en_US
dc.identifier.faculty Engineering en_US
dc.identifier.department Department of Earth Resources Engineering en_US
dc.identifier.year 2016 en_US
dc.identifier.conference ERE 2016 Annual Conference on Earth Resources Management en_US
dc.identifier.place Katubedda en_US
dc.identifier.pgnos pp. 47-53 en_US
dc.identifier.proceeding Proceedings of the ERE 2016 Annual Conference on Earth Resources Management en_US
dc.identifier.email indhishes@uom.lk en_US


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