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A critical assessment and new research directions of rice husk silica processing methods and properties

Keywords: rice husk silica , opaline silica , nanosilica , thermo-baric process

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Abstract:

A review of production and properties of silica produced from rice husk is carried out withassessment of processing and manufacturing methods and suggestion of new research directions withrespect to the processing methods. It was revealed that the structural nature of the silica produced fromrice husk is independent of the purification methods but largely dependent on the incinerationtemperature used in the production process. Also, it was established that without pre-treatment,incineration of rice husk results in the production of silica of low purity, surface area and whiteness.The paper concludes by advocating the use of a novel process called hydro thermo-baric process, forproducing high-purity reactive nano-silica from rice husk. This novel process, has the advantages ofhigh volume production, versatility of application of its product through varying any of its processparameters and being environmentally benign compared to other processes.

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