What are the moisture in the Fire-proof Material?
Fire-proof Material before sintering should have a pre-burning drying process, and this process is also called the process of drying water, there are three kinds of refractories in the water were: structural water, crystal water, free water.
What is the structure of water? The structure of water in minerals generally refers to the H +, OH- or H3O + ion state (more commonly OH-) added to the mineral crystal structure. These ions in the mineral lattice occupies a certain position, its content must be combined with a solid. Only in the 600 ~ 1000 ℃ conditions, the structure of the lattice was destroyed before they can escape. Fire-proof Material Such as kaolinite water loss temperature of 580 ℃, talc 950 ℃, serpentine 670 ℃, magnesium hydroxide at 410 ℃.
What crystal water Water in the form of neutral molecules (H2O) to participate in the crystal meridional structure, and occupy a fixed position, the number of water molecules and other components of mineral into a simple integer ratio of water called crystal water. Crystallization water in the mineral lattice combined with a firmer degree than the structural water. Generally when the heat reaches 200 ~ 500 ℃, it will lose water. Individual mineral dehydration temperature up to 600 ℃. With the loss of crystal water, Fire-proof Material the crystal structure of the original mineral is destroyed or modified, so that the reconstructed lattice is called another mineral and causes changes in the physical properties of the mineral.
What is free water? Free water is not involved in the mineral lattice composition, but in the form of mechanical adsorption in the mineral water, and thus the content of uncertainty. Fire-proof Material According to the free water in the mineral in the form can be divided into: due to surface energy adsorption in the mineral surface and the gap in the ordinary water, also known as adsorption water. It depends on its existence can be divided into film water, capillary water, colloidal water. The content of adsorbed water varies with the temperature. At atmospheric pressure, when heated to 100 ~ 110 ℃, can all escape from the mineral, but the colloidal water escape temperature is higher, about 100 ~ 250 ℃.
In addition there is a neutral molecule in the form of some of the layered silicate minerals in the interlayer water, exists in the zeolite mineral lattice in the zeolite water. Fire-proof Material They are similar in nature, between crystal water and adsorbed water.
Previous: Extend The Life Of Fire-proof Material