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Rice husk sodium silicate: a tonic for creating wealth

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Update time : 2024-01-17 15:10:39
Sodium silicate made from rice husks is a natural resource that can create wealth from waste, promote sustainable use of raw materials, and lead to national development, especially in developing countries such as Nigeria.
In order to reduce environmental degradation caused by trends such as raw material pollution, high energy demand, and harmful gas emissions (such as carbon dioxide), global industrial production processes are gradually shifting towards more sustainable use of raw materials.
Sodium silicate is a clear, liquid, sticky, semi-solid, or solid material with significant potential for generating wealth from waste. It has a wide range of applications in various industries, such as silicone, detergents, packaging, glass cement, pottery and coarse pottery, fire-resistant paper, absorbents, abrasive particles, refractory materials, inorganic coating adhesives, egg preservatives, and many other applications.
In Nigeria, the annual demand for sodium silicate exceeds 20000 metric tons, and most industries heavily rely on importing sodium silicate from India, China, and Egypt. Rice husks are the outer layer of rice, accounting for 20% of the world's rice production. In 2016 alone, approximately 190 million tons of rice husks were produced and have various industrial applications. It is used as industrial fuel for processing rice and generating steam in power plants. It is also used as a fertilizer and substrate for pet food fiber and a raw material for brick production. Rice husk ash is also used as a component in the preparation of activated carbon or silicon dioxide and silicon compound production substrates.

The market for sodium silicate
The industrial use of sodium silicate continues to expand, increasing its demand and global production.
In 2021, the global sodium silicate market capacity was 26.65 million metric tons, and it is expected to increase to 33.09 million metric tons within 8 years, with a compound annual growth rate of 3.6%. The market expansion can be attributed to the growing global demand for detergents and the increasing use of sodium silicate in various applications, such as water treatment, toothpaste, ceramic production and silicone synthesis, the automotive industry, the pulp and paper industry, and the construction industry.

The characteristics of sodium silicate
Sodium silicate is an inorganic compound mainly composed of three elements: silicon, oxygen, and sodium. It has the following characteristics:
1. Stability: Sodium silicate is stable under various temperature and pH conditions and can react with other substances, making it an ideal choice for industrial processes.
2. Bonding force and strength: After hardening, the main component of sodium silicate is solid silicate gel, whose large specific surface area endows high cohesion. However, the quality of sodium silicate itself, the performance of the mix, and the construction and maintenance significantly impact the strength.
3. Acid resistance: It is difficult to react with almost all inorganic and organic acids except for hydrofluoric acid (HF), hot phosphoric acid, and advanced fatty acids, whether block or packaged solid anhydrous sodium silicate.
4. Heat resistance: The silica network skeleton formed after hardening has a minimal decrease in strength at high temperatures. When heat-resistant and fire-resistant aggregates are used to prepare sodium silicate mortar and concrete, the heat resistance can reach 1000 ℃. The heat resistance of silicate concrete is mainly determined by the heat resistance of aggregates.
5. Poor alkali resistance: Cannot be used in alkaline environments. This is because sodium silicate reacts chemically with alkali, causing the solid sodium silicate to dissolve. It reacts faster with sodium silicate in fine powder form.
6. Poor water resistance: Sodium silicate is not completely miscible with water and is prone to producing colloidal silicate solutions. This colloidal solution has a high viscosity and can quickly disperse in water.
7. Wide use: sodium silicate can be used to produce a variety of chemicals.

The widespread application of sodium silicate
1. It is used in the chemical system to manufacture various silicate products such as layered silica, silica sol, silica gel, zeolite molecular sieve, sodium metasilicate pentahydrate, instant powdered sodium silicate, potassium sodium silicate, etc. It is the basic raw material for silicon compounds.
2. In light industry, sodium silicate is an important raw material for detergents, as well as a water softener and precipitation agent. Used in the textile industry for assisting dyeing, bleaching, and sizing; Widely used in the mechanical industry for casting, grinding wheel manufacturing, and metal preservatives, etc.; Used in the construction industry to manufacture quick-drying cement, acid-resistant cement waterproof oil, soil solidifying agent, refractory materials, etc; Silicon fertilizers can be manufactured in agriculture.
3. It can be used as a silicon aluminum catalyst for petroleum catalytic cracking, a filler for soap, deinking and bleaching in papermaking, an adhesive for corrugated paper, a metal preservative, a water softener, a detergent additive, refractory materials and ceramic raw materials, and a bleaching, dyeing, and sizing agent for textiles.
4. The main properties include mineral processing, waterproofing, leak sealing, wood fire prevention, food preservation, and adhesive production.

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