The production process and performance of calcium silicate board

Calcium silicate board is a kind of insulation refractory material, according to the chemical composition of minerals are divided into two categories:

(1) ordinary silicon calcium board: chemical composition of CaO / SiO2 ≈ 0.8, the mineral composition of tobermosolite (5CaO · 6SiO2 · 5H2O);

(2) calcium silicate board: chemical composition of CaO / SiO2 ≈ 1.0, mineral composition of calcium silicate (6CaO · 6SiO2 · H2O).

Production Process

According to the ingredients ratio of raw materials, together with the water into the mixer mixed with stirring, diatomite in the amorphous SiO2 at 100 ℃ and lime under the gel reaction to form SiO2 particles adsorbed on the surface of CaO particles agglomerate.

This pellet in the autoclave saturated steam temperature and pressure under the action of hydrothermal reaction, hydrothermal synthesis. When CaO / SiO2 is about 0.8, it is produced as CaO · SiO2 · H2O which is rich in calcium, and further produces low-crystallized tobermolanite (5CaO · 6SiO2 · 5H2O), and finally to high crystallinity of porosity of 90% or more Tootho to stone skeleton, after drying to remove the pores of the water, it becomes silicon calcium insulation material, to be shaped to become products. When CaO / SiO2 is about 1.0, it becomes calcium silicate (6CaO · 6SiO2 · H2O). Silicon calcium plate can be sawed, can be nailed, can be made of plate, block or tube shape.

silicon calcium board performance

China's calcium calcium board performance is as follows: bulk density (kg / m3) is divided into: 240,220,170 three, the international majority of the provisions of not more than 220kg / m3. Pressure strength 0.4MPa or more, bending strength 0.2MPa or more, thermal conductivity (70 ± 5 ℃) 0.049 ~ 0.064W / (m • K). The maximum temperature of the top plate is 650 ° C, the hard silicite slab is 1000 ° C, the other is the terrestrialite and the calcite mixture. Therefore, silicon calcium board with a small volume, low thermal conductivity, high strength, easy construction, low loss rate and other excellent performance.