You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    Volume 4, Issue 1

    Characterization of Na and Ca Zeolites Synthesized by Various Hydrothermal Treatments of Fly Ash

    (Received 18 December 2014; accepted 21 April 2015)

    CODEN: ACEMF9

      Format Pages Price  
    PDF (1.3M) 14 $25   ADD TO CART

    Cite this document

    X Add email address send
    X
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word



    Abstract

    For the past several decades, researchers have studied the zeolitization of coal fly ash (class-F) by following different methods (viz., open and closed hydrothermal, and fusion followed by hydrothermal). In fact, these methods involve sequential processes like (i) dissolution of silica and alumina from the fly ash, (ii) nucleation of zeolite, and (iii) crystallization (growth of zeolite) in the reactant solution. Also, performance of these processes has been reported to vary with the type of alkali used as reactant and often, NaOH has been preferred for high cation exchange capacity, resulting in sodium zeolites. However, large scale applications of Na-based zeolites in soil and water are questionable due to the presence of high sodium, thereby increasing the sodicity and salinity of the soil/water. In addition, performance of the zeolites, as adsorbent, synthesized by different methods is expected to depend on various characteristics (viz., mineralogy, structural bonding, specific surface area, pore volume, and morphology), of the zeolites. In order to address the above issues, the present study is focused to investigate the various characteristics of the synthesized zeolites by (i) the above mentioned three methods, (ii) using Ca(OH)2 as reactant, and (iii) considering Na and Ca present in the fly ash. Thus, the aim of the study was to ascertain (i) a suitable method out of the three and (ii) characteristics of the blend of Na- and Ca-zeolites from the fly ash, which can be used as a controlled release fertilizer, as sorbent for water and soil decontamination.


    Author Information:

    Koshy, Nevin
    Research Scholar, Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai,

    Singh, D. N.
    Institute Chair Professor, Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai,

    Jha, Bhagwanjee
    Head, Department of Civil Engineering, Government Polytechnic, Dadra and Nagar Haveli,

    Kadali, Srinivas
    Assistant General Manager, Powerdeal Energy Systems Pvt. Ltd., Nashik, Maharashtra

    Patil, Jayant
    Assistant General Manager, Powerdeal Energy Systems Pvt. Ltd., Nashik, Maharashtra


    Stock #: ACEM20140048

    ISSN:2165-3984

    DOI: 10.1520/ACEM20140048

    Author
    Title Characterization of Na and Ca Zeolites Synthesized by Various Hydrothermal Treatments of Fly Ash
    Symposium ,
    Committee D32