calcium silicate board

The calcium silicon plate (calcium silicate board)


Diatomite and lime as the main raw material, add reinforced fiber of insulating refractory products is also called the calcium silicate board, microporous calcium silicate board.


A brief history of the United States in 1940 Owen % 26 bull; Corning (Cweuce % 26 bull; Cornmg) glass fiber company first successfully developed and produced calcium silicon plate products; Since the 1950 s, Japan, Britain and other countries have the production and development; China began to have this kind of products available in the 1970 s.


Classified according to its composition is divided into two kinds, one kind is ordinary calcium silicon plate, chemical composition of CaO/SiO2 is 0. 8 the left and right sides, mineral composition for Mr Mullite (Tobermorite, 5 cao % 26 bull; 6 sio2%26 bull; 5 h20), kind of hard calcium silicate, chemical composition of CaO/SiO2 is 1. About 0, the mineral composition is hard calcium silicate (Xonotite, 6 cao % 26 bull; 6 sio2%26 bull; 2 h20).


Performance calcium silicon plate has a small volume weight, high strength, low thermal conductivity, convenient construction, low attrition rate, excellent performance.


Calcium silicon plate density, the international majority rule is not greater than 220 kg/m3, and there are further divided into no more than 220 kg/m3, no more than 170 kg/m3, no more than 130 kg/m33; China is classified as no greater than 240 kg/m3, no more than 220 kg/m3, not more than 170 kg/m33 kinds. The compressive strength at 0. More than 4 mpa, flexural strength at 0. More than 2 mpa; Thermal conductivity (70 ℃ % 26 plusmn; 5 ℃) to 0. 049-0. 064 w/(m % 26 bull; K) the highest use temperature, is 650 ℃, through hard type calcium silicate is 1000 ℃.


Process of ordinary calcium silicon plate manufacturing by heating gel method (also called static method), hard calcium silicate board production using dynamic hydrothermal synthesis method.


Raw materials include siliceous raw materials, calcium material, reinforced fiber and additives.


Siliceous raw materials mainly for diatomite. Diatomite porous structure, small bulk density, specific surface area is big, is a kind of containing SiO2 materials the lightest, SiO2 is functional, the diatom test contains under 100 ℃ warm water in easy to react and lime, generate the colloid. Can use bentonite, silica, clay, shale, fly ash, siliceous tuff, quartz powder instead of diatomite, etc.


Calcareous raw materials, give priority to with lime. The effective CaO content should be within the scope of 73% ~ 92%, had better choose effective CaO content not less than 85% of lime; Fresh lime water digestion into lime, the CaO particle size less than 1 um, not only good suspension, and easy to adhere to the SiO2 particles on the surface. Can use cement instead of lime.


Enhance fiber, must have a good dispersibility, alkali resistance, heat resistance and affinity with the substrate. Asbestos is a kind of good silicon