Light burned magnesium oxide can be used more widely as a civil product

It is widely used in national defense, medicine, chemical industry, papermaking, shipbuilding and other industries as flexural, pressure-resistant, high-strength, gas-hard and cementitious material. In the building materials industry can be made tire board, particleboard, heat preservation column, railing, artificial marble, asbestos tile, ordinary tile, wallboard, laid ground. With the progress of science and technology, light burning magnesium powder is more widely used, can be used as civil products, heavy and heavy machinery packing boxes, bottom beam packaging, high temperature refractory materials, but also can produce beautiful and generous bright strong furniture, in the mechanical industry can be made casting model.

A substance that cements loose refractory materials together and produces sufficient strength at room temperature or high temperature. According to the chemical properties of binder, it can be divided into inorganic binder and organic binder. Inorganic bonding agent and silicate, aluminate, sulfate, chloride and sol, etc. Among them, sol binder plays an important role in improving the high-temperature performance of refractory materials, which has become the focus of research in the field of binder. Organic binders are water-soluble and water-insoluble. According to the hardening conditions of the binder can be divided into hydraulic, pneumatic and thermal rigid binder.

The self-silting phenomenon in the construction process of refractory castable is caused by the reaction of calcium aluminate cement hydration products with atmospheric CO2, SO2, H2S and other acidic gases, which leads to the decomposition of hydration products and the decline of the strength of refractory castable. It mainly includes three chemical processes: carbonation reaction of calcium aluminate cement, carbonate reaction of calcium aluminate cement with alkali and reaction of aluminate cement with sulfite.

In the curing or natural drying process of refractory castable, with the evaporation of water, some soluble carbonate, phosphate, sulfite and other salts crystal precipitation, part of the salt containing crystal water weathering, water loss, crystal transformation, accompanied by volume change, intensified the strength loss of refractory castable. There is also a class of salts without crystal water, this type of salt salting out will not bring crystal transformation and volume change, on the surface strength of refractory castable is not too much influence, will only affect the surface quality of refractory castable.