What are the production methods of calcium silicate board material?
At present most of the static process, the raw materials and auxiliary materials according to a certain proportion, adding an appropriate amount of water, while stirring heated to a certain temperature of the gel, and then after molding, autoclave curing, drying is calcium silicate insulation material products. In static method, diatomite is used as siliceous material, calcium material is more lime. The process is simple, low cost, but when the production needs of large capacity and high pressure kettle, the reaction is not complete, the main form of Tobey mullite type calcium silicate board, the use of low temperature (<650 degrees Celsius), it is difficult to produce light and ultra light high strength products.
Calcium silicate (microporous calcium silicate) material and calcium silicate board are produced by static steaming method, dynamic hydrothermal synthesis method and two reaction method.
The two reaction method (also called combined method) is the most complete and easy to obtain process of high temperature, light weight and high strength calcium silicate products and calcium silicate boards, but its disadvantages are long process, high energy consumption and large investment.
The synthesis process of dynamic method is carried out under stirring, the synthesis temperature is higher than the static process, and under the compression condition. The dynamic method is simple, no gel chemical order, products made of small capacity, good performance, can obtain high temperature (1000 degrees Celsius) of xonotlite products and ultra light products, but the need for high pressure vessel with stirring device, equipment and process condition requires high energy consumption and investment are higher. At present, this method is adopted abroad.
