In developing countries like India, China, and Thailand, there is great need to produce clean safe drinking water. One way that people in these countries clean their drinking water is by burning rice husk ash to create silica that can be used as a filter. Rice husk ash has been found to contain high levels of Silica which is also present in other biomass sources.

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What is Silica?

Silica is a chemical compound that has two main types: amorphous silica and crystalline silica. Amorphous silicate is most often found in building materials like glass, while crystals are commonly used as a food additive or in pharmaceutical tablets due to their high level of purity. The purple or pinkish substance found in some grains of rice is an example of crystalline silica, sometimes called a cultured pearl. Silica is a mineral that is important to living organisms and is used in making medicines, grooming products, glass and much more.

Usage of Silica

Silica occurs naturally in the environment but can also be produced synthetically. It is used in a wide variety of products, including:

1. Paint / Coatings

2. Plastics / Rubber

3. Personal Care

4. Elastomers

5. Wood

6. Construction Materials

7. Explosives / Insulators

8. Pharmaceuticals / Vitamins / Dietary Supplements

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Importance of Silica

Silica is a very important ingredient in glass and glass ceramics because it forms a liquid during the melting process that cools and firms into the glassy matrix of these materials. Glass requires an added amount of this substance to be a strong, clear barrier against ultraviolet radiation. It has a high melting point and solidifies at temperatures between 1000–1150 °C. Glass is used in different applications like windows, roofing tiles and bottles.

Glass can be manufactured through different processes including the production of soda-lime glass (SLG), borosilicate glass (BGN), lead glass (PLG) or vitrified glass (VG).

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Silica is important because it has the ability to improve the taste of boiled water and remove heavy metal particles from the surface of drinking water containers. It is key to filter water for use in drinking, cooking and washing. Silica also contains antimicrobial properties that can help reduce the spread of bacterial infection. However, there are very few people in rural areas who get to benefit from silica water because most of their supplies are from overseas and not locally available.

Traditionally, rice husk ash has been used by villagers for fuel. However, burning rice husk ashes for fuel is limited.

Rice husk ash and biomass are materials that can be found in almost every rural village, and also around the world. According to researchers, rice husk is a renewable resource that can easily be re-grown. Unlike other minerals, it is difficult to deplete and is recovered within a growing season. Rice husk ash generally costs less than 5% of the cost of raw materials used in the production of silica using traditional methods.

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In addition to producing silica using rice husk ash, it is recommended that farmers should also add sodium bicarbonate to the mixture. This will help produce better quality charcoal that is suitable for manufacturing drinking water filters and cookers.

Market Insights and Analysis

A crucial component in the manufacture of semiconductors, silicon also serves as the primary constituent of a number of other goods, including glass, ceramics, and paint. The demand for silicon will keep rising quickly because there is currently a huge need for high-performance electronic products. Raw materials are cheap and plentiful in wealthy nations.

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Over the next 8 years, it is expected that the manufacturing of silica from rice husk ash will expand at a pace of 5.00%.

Someone in their twenties might not know what rice husk ash is or how it is made if you ask them. However, for those who have lived a long period, this is a method that has been used for a very long time and is still useful now.

Through this method, the mineral silicon dioxide (SiO2), commonly referred to as silica or quartz, is removed from rice husk. SiO2 serves a variety of purposes and is a crucial component of numerous goods, including glass, ceramics, and paint.

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Additionally, the production of electronic and telecommunication equipment, armour plating for automobiles and ships, and the production of concrete all employ this substance. Not just impoverished countries, but even developed countries, have a stake in the production of silica. The semiconductor, optical, and electronic industries employ silica as raw materials.

The market for nano silica was valued at $3.6 billion in 2000 and was expected to reach $6.4 billion in 2030. 6.0 percent growth is predicted by the CAGR from 2020 to 2030. According to some estimates, China is currently the largest producer and exporter of silica, with production expected to reach 6 million metric tonnes in 2021.

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China supplies 64% of the world’s silica. The second-largest producer is Russia. Each year, it generates about 580,000 metric tonnes of silica. The two other key countries in the Silica supply chain are Norway and Brazil. India’s largest supplier of silica is Ashirvad Chemicals.

Growing demand is anticipated to present chances in the worldwide rice husk ash market due to adherence to environmental regulatory criteria and decreasing raw material and manufacturing costs.

The significant reliance on the production of rice paddy and disposal problems related to rice husk ash are anticipated to restrain the expansion of the worldwide rice husk ash market.

Ending Note:

There are many uses and applications for silica, including the production of paper, glass, water filtration, paint pigment, ceramics, dyes, and pigments. As was already established, silica is extremely porous, has a large specific surface area, and a peculiar purity.

Contact NIIR Project Consultancy Services if you’re seeking a business opportunity to produce silica from rice husk ash. In the realm of business, NPCS has made a name for itself as a reliable source of integrated technical consulting services. Planners, engineers, specialists, experts, financial experts, designers, and economists with in-depth knowledge of the sector administer NPCS.

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