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Cenosphere


Introduction

The word Cenosphere is derived from two Greek words Kens (hollow) and Sphaira (sphere). Cenospheres are light weight, inert hollow sphere comprising largely of silica & alumina and filled with air or inert gas. Cenospheres are a naturally occurring by product of the burning process of pulverized coal-fired boilers. They are formed during the molten state of ash and attain spherical shape to have minimum surface tension. Any gas bubbles (generally inert gases e.g. N2, Co2, unburnt coal particles etc.) flowing along the combustion gas stream, are also trapped inside the spheres.These bubbles cause the production of Cenosphere; bubbles may occur in multiple forms within the frozen particles, or as a single, concentric form, that are nearly as great as the diameter of the particle.They are found floating on the surface of fly ash lagoon.

NVVN has undertaken exclusive rights for harvesting of Cenosphere from lagoons of all NTPC stations.The quality of combustion and strict quality control during harvesting, ensures that unprocessed Cenosphere available with NVVN, can match requirement of Physical & Chemical properties for different kind of application. However, Buyers may decide the need for processing and testing of Cenosphere before actual use in manufacturing of their intended product.

NVVN expects to offer unprocessed Cenosphere for sale through E-auction from time to time. During the period Dec '05 to May '07, 24 e-auctions were held for Cenosphere Sale through M/s MSTC e-auction portal. For further terms and conditions log on to www.mstcauction.com or www.mstcindia.com .For tentative Cenosphere properties marketed by NVVN, probable utility and application, Please read Product Information. In case of any further queries e-mail to ashokbhatnagar@ntpc.co.in,contact no. (M) : 9868391506.

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