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New Technology Classification of Magnesia Chrome Brick

Date:2017-02-07 17:21 From:Zhengzhou Sunrise Refractory Author:admin
Light burning powder is the activity higher alkaline oxide obtained by the magnesite after a certain temperature and lightly burned, usually processed into 100-325 mesh fine powder for sale, the main component is magnesium oxide, often containing iron, manganese, aluminum, calcium, silicon and other oxide impurities, commonly known as "light burning magnesium". The light burned powder through deep finishing into high purity ultra-fine magnesium oxide, can greatly improve the economic efficiency and enhance the value-added products.
Raw materials to produce magnesia chrome brick are: natural raw material, synthetic raw material and industrial chromium oxide and industrial alumina. Natural raw material: such as various grades of sintered magnesia, ordinary chrome ore and low impurities content of chromium. Synthetic raw material: from magnesia and chrome ore by fine grinding, mixing, compacting, and then calcined under high temperature obtained by the sintered magnesia chrome material, and by the magnesite and chrome ore fused by the electric fused magnesia chrome, and fused magnesia. Synthetic material should generally be low impurity content of raw materials.
Magnesia chrome brick's varieties, the name of chaos, easy to confuse. According to the name of magnesia chrome brick at home and abroad, the following can be standardized.
1. Ordinary magnesia chrome brick
This kind of brick is made of impurities (SiO2 and CaO) more chrome ore and magnesia. Firing temperature is not high, around 1550 ℃. The microstructure characteristics of brick are: between the refractory grains are bonded by silicate..
The fine powder of this kind of firebrick is made by the ordinary chrome ore and magnesia grinding, mixing, compacting, calcined magnesium chromium material, still silicate. But the performance has more improvement than ordinary magnesia brick.
2. Direct combination magnesia chrome brick
Direct combination magnesia chrome brick, is made of the low impurity content of chromium ore and pure magnesite. The firing temperature is more than 1700 ° C. The structural characteristics of the kind of refractory brick are: between refractory grains are mostly in direct contact. So its high temperature performance, corrosion resistance and erosion are better than ordinary magnesia chrome brick.
3. Combined with magnesia chrome brick
Combined with magnesia chrome brick, due to raw material is more pure, need fire is above 1750 ℃ high temperature or ultra-high temperature. Its microstructure characteristics are:spinel and other components are evenly distributed , between refractory grains is in the direct contact. In the anti-erosion, anti-erosion, it is better than the first two magnesia chrome brick.

4. Semi-re-combination magnesia chrome brick
This type of refractory brick is also fired at more than1700 ℃ high temperature, between refractory grains within the brick are also in direct combination. The advantages are thermal shock resistance is better, erosion resistance and anti-erosion are also good.
5. Casting magnesia chrome brick
The structure characteristics of casting magnesia chrome brick are: the components distribution is uniform, between refractory grains are mainly in direct contact, silicate to island-like existence. The melt erosion resistance, penetration and erosion of this refractory brick are particularly good. It is product designed for the non-ferrous smelting development.
6. Chemical combination non-burning magnesia chrome brick
Magnesite and chrome ore are generally used as raw materials to brick, sodium or sodium hexametaphosphate or water glass for the binding agent to suppress the magnesia chrome brick. No high-temperature firing, only about 200 ℃ temperature baking.


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