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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/13394
Title: Sustainable utilization of paper mill solid wastes via synthesis of nano silica for production of belite based clinker
Authors: Vashistha P.
Singh S.K.
Dutt D.
Kumar V.
Published in: Journal of Cleaner Production
Abstract: The industrial solid waste generation and its stockpile disposal have major environmental consequences. These consequences could be minimized through the solid waste application as a raw material in other industries. The current study focusses on the utilization of lime sludge with boiler ash synthesized nanosilica for production of belite based clinker at relatively lower temperature. Lime sludge was also used in combination with fly ash and boiler ash to check the synthesis of compounds at varying temperatures. Nanosilica was synthesized from pretreated boiler ash through alkali treatment and acid precipitation. The synthesized nanosilica has been characterized for specific surface area, crystallinity, surface functional groups and size. Three different mixtures, containing lime sludge with nanosilica, fly ash, and boiler ash are fired at temperatures ranging from 900 °C to 1200 °C and characterized for the synthesis of belite. Conventionally, belite is synthesized above 1200 °C, whereas the combined application of lime sludge and nanosilica reduces the temperature of belite synthesis to 900 °C without pre calcination or addition of any chemical stabilizer. In the case of lime sludge and boiler ash blend, belite formation takes place at the higher temperature (1100–1200 °C). Anorthite synthesis takes place in case of lime sludge and fly ash blend, due to high percentage of alumina present in fly ash. Lime sludge and nanosilica based belite clinker are used to develop newer cementitious binder. Hydration and strength properties of developed binder proved worthy as building materials. This study will present alternatives for sustainable utilization of lime sludge, fly ash and boiler ash in construction. © 2019 Elsevier Ltd
Citation: Journal of Cleaner Production (2019), 224(): 557-565
URI: https://doi.org/10.1016/j.jclepro.2019.03.207
http://repository.iitr.ac.in/handle/123456789/13394
Issue Date: 2019
Publisher: Elsevier Ltd
Keywords: Belite
Boiler ash
Clinker
Fly ash
Lime sludge
Nano silica
Solid waste
ISSN: 9596526
Author Scopus IDs: 57203901977
56763025800
7005982560
57204134295
Author Affiliations: Vashistha, P., Indian Institute of Technology, Roorkee, India
Singh, S.K., CSIR-Central Building Research Institute, Roorkee, India
Dutt, D., Indian Institute of Technology, Roorkee, India
Kumar, V., Indian Institute of Technology, Delhi, India
Funding Details: This research studies was financially supported by Department of Science & Technology (Government of India) and M/s Ruchira Paper Industry Kalaamb Himachal Pradesh (India) . The funding was provided under the scheme of Uchatar Aviskar Yojana (UAY) with award number UAY-1012 DPT . The authors would like to thank the staff of Indian Institute of Technology (IIT) Roorkee and CSIR-Central Building Research Institute, Roorkee for the support in successful completion of the work.
Corresponding Author: Kumar, V.; Centre for Rural Development & Technology, Indian Institute of Technology DelhiIndia; email: vivekk@iitd.ac.in
Appears in Collections:Journal Publications [PT]

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