Definition and Composition
Calcium silicate is a common inorganic compound with the chemical formula CaSiO3. It is a white or gray powder, sometimes present in mineral form as wollastonite. It is composed mainly of calcium, silicon, and oxygen. Calcium carbonate minerals such as calcite and limestone are different compounds (CaCO3) and should not be confused with calcium silicate.
Uses in Building Materials
Calcium silicate is often used in building materials to produce cement, lime, gas expansion agents, and insulation boards. Its thermal stability and fire resistance make it suitable for high-temperature insulation applications.
Use in Metallurgy and Casting
Calcium silicate is used as a raw material for steel smelting and as an auxiliary material for casting, where it supports slag behavior and melt treatment.
Use in Agriculture
Calcium and silicon products can also be used as fertilizers and soil amendments, promoting plant growth, development, and stress resistance to a certain extent.
Handling Precautions
Calcium silicate powder has a certain degree of corrosiveness; attention should be paid to preventing inhalation and contact with skin and eyes during use and storage. The powder is also prone to moisture absorption and should be stored in a dry, ventilated place.
Frequently Asked Questions
What is the chemical formula of calcium silicate? CaSiO3.
Is calcite the same as calcium silicate? No. Calcite and limestone are calcium carbonate (CaCO3), a different compound.
What is calcium silicate used for? Building materials, steel smelting and casting auxiliaries, and agricultural fertilizers and soil amendments.
What are the hazards of handling calcium silicate powder? It has a certain degree of corrosiveness, so inhalation and contact with skin and eyes should be avoided, and it absorbs moisture and needs dry storage.
What is wollastonite? The mineral form in which calcium silicate sometimes occurs; industrially the material is a white or gray powder composed mainly of calcium, silicon, and oxygen.
