Silica (SiO2) is a valuable inorganic compound available in gel, crystalline, and amorphous forms and is widely used across industrial applications. Conventional production of pure silica can be energy intensive and may require furnace temperatures exceeding 700 degree C. The project presents a chemical process for extracting precipitated silica from rice husk ash, a non-conventional raw material containing about 90-98% silica after complete combustion.
Rice husk is commonly used as boiler fuel, and its combustion generates ash that can create significant disposal, pollution, and health concerns around rice mills. The proposed process converts this waste into a valuable silica product while also enabling recovery of sodium sulphate from effluent wash water. Sodium sulphate can be recovered through evaporation, crystallization, filtration, and drying. Residue ash containing retained sodium silicate can also be used as a binder in the manufacture of quality bricks with suitable ingredients.
The report notes that approximately twenty five million tons of rice husk are obtained from rice mills in the country and are commonly burnt, generating substantial quantities of ash. It further indicates the potential to produce two million tons of pure high grade silica from rice husk to serve industries with significant silica demand. States identified as having large numbers of rice mills include Andhra Pradesh, Tamil Nadu, Karnataka, and Kerala.
| Cost Parameter | Value |
|---|---|
| Plant Cpacity | 20 MT/Day |
| Land & Building (6000 sq.mt.) | Rs. 3.43 Cr |
| Plant & Machinery | Rs. 8.50 Cr |
| Working Capital for 2 Months | Rs. 2.36 Cr |
| Total Capital Investment | Rs. 14.54 Cr |
| Rate of Return | 26% |
| Break Even Point | 58% |
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