Journal
JOURNAL OF CLEANER PRODUCTION
Volume 264, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2020.121689
Keywords
Spent foundry sand; Sodium silicate; Hydrothermal process; Depolymerisation mechanism
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Funding
- PSG & Sons' charities, Coimbatore, Tamilnadu, India
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In this study, spent foundry sand (SFS) was treated and used as a source to synthesis sodium silicate. Initially, SFS was subjected to calcination (C-SFS) followed by acid bleaching (A-SFS) to yield quartz silicate in high purity. After each treatment, the samples were studied using field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) to analyse their properties. The hydrothermal process was performed using A-SFS with alkali hydroxides to obtain the corresponding alkali silicates. The optimisation studies conducted at different temperatures and time periods revealed that the maximum yield of 97.6% was obtained at 225 degrees C for 3 h. A plausible depolymerisation mechanism is also proposed based on the observations from Si-29 NMR and XRD results of residues. Thus, present study facilitates the synthesis of sodium silicate effectively by utilising SFS, which in turn minimizes the waste disposal. (C) 2020 Elsevier Ltd. All rights reserved.
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