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Combustion of rice hulls affords rice husk ash (acronym RHA). This ash is a potential source of amorphous reactive silica , which has a variety of applications in materials science . Most of the ash is used in the production of Portland cement . [ 1 ]
The most commonly used pozzolans today are industrial by-products such as fly ash, silica fume from silicon smelting, highly reactive metakaolin, and burned organic matter residues rich in silica such as rice husk ash. Their use has been firmly established and regulated in many countries.
Sujal was a very basic low-cost model which used rice-husk ash (produced from heating rice husk in combination with pebbles and cement). Activated silica and carbon is present in the ash; silica can reduce the turbidity of water, while activated carbon binds with and absorbs non-polar impurities (such as pesticides and fertilisers).
Pozzolana from Mount Vesuvius volcano, Italy. Pozzolana or pozzuolana (/ ˌ p ɒ t s (w) ə ˈ l ɑː n ə / POT-s(w)ə-LAH-nə, Italian: [potts(w)oˈlaːna]), also known as pozzolanic ash (Latin: pulvis puteolanus), is a natural siliceous or siliceous-aluminous material which reacts with calcium hydroxide in the presence of water at room temperature (cf. pozzolanic reaction).
Silica is also the primary component of rice husk ash, which is used, for example, in filtration and as supplementary cementitious material (SCM) in cement and concrete manufacturing. [26] Silicification in and by cells has been common in the biological world and it occurs in bacteria, protists, plants, and animals (invertebrates and ...
Rice-husk fuel-pellets are made by compacting rice-husk obtained as by-product of rice-growing from the fields. It also has similar characteristics to the wood-pellets and more environment-friendly, as the raw material is a waste-product.
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