The production of sodium silicate

Sodium silicate is a product with unlimited possibilities. It is a chemical compound of silicon dioxide (SiO2produced from pure silver sand), disodium oxide (Na2O) and water. Silmaco uses only the purest quartz sand in the world to produce silicates for its customers. Additionally, we can customize our production of sodium silicate to provide the molar ratio (the ratio of disodium oxide to silicon dioxide) you require.

There are two methods for the production of sodium silicate:

Hydrothermal production of sodium silicate

With the hydrothermal process, also known as the 'wet process', silver sand (SiO2) is reacted with caustic soda (NaOH) and water. The result is an alkaline liquid sodium silicate with a molar ratio less than 2.5.

The furnace process for sodium silicate

With the furnace process, soda (Na2CO3) and sand are fused at temperatures over 1000 °C. The result is a glass-like sodium silicate with a molar ratio that is usually greater than 2.5 (standard ± 3.4). The resulting product (commonly called cullet) can be dissolved under conditions such as pressure, temperature and time to produce neutral silicate. Molar ratios up to 3.5 are possible.

For the production of granulated and powdered metasilicates and disilicates, we use liquid alkaline silicate as a basis. Our state-of-the-art process technologies guarantee the highest quality of granulated silicate.