Topower Refractory Magnesia Chrome Bricks For Sale, Customer In Indonesia Ordered 20 ton
Topower magnesia chrome refractory bricks mainly used in industrial furnace
Magnesia-chrome refractory is a sintered refractory made from magnesia and chromite. To be familiar with the characteristics of this material and use it reasonably, you need to start with magnesia and chromite. (1) Chemical properties of magnesia The main mineral in magnesia is periclase MgO, which is also one of the common minerals in cement clinker. Periclase can coexist with the four main minerals in cement clinker, C3S, C2S, C3A, and C4AF. Therefore, periclase has excellent corrosion resistance to cement clinker. (2) Physical properties of magnesia Periclase is an isometric mineral with a hardness of 6, a relative density of 3.58, a melting point of up to 2800℃, a thermal expansion coefficient of 13.5×10-6/K from 0 to 1000℃, and a thermal conductivity of 3.39 to 4.19W/(m·K) from 100 to 1000℃.
Magnesia bricks and magnesia chrome bricks are alkaline refractory materials composed of chromite and magnesia, and belong to chromium spinel refractory materials. The following points should be considered when manufacturing this type of brick:
(1) The influence of the ratio of chromium ore and magnesia on the properties of chromium-magnesia refractory materials.
(2) The influence of matrix mineral composition on product performance.
(3) The influence of atmosphere properties. Chrome-magnesia refractory materials should be fired in a weakly oxidizing atmosphere.
2. Production of magnesia-chrome bricks
Magnesia chrome bricks are made of sintered magnesia and chromium ore. The MgO content in the ingredients is controlled to be 60-70%, and the Cr2O3 content is 8-12%. This product has good stability, a refractoriness greater than 2000℃, and is a slightly alkaline refractory material.
Mixing: Chromite is brittle and easy to crush, so it is mixed in a sand mixer;
Molding: Molding by hydraulic press or friction brick press, the density of the green body is 4.3g/cm3;
Firing: Firing in a weak oxidizing atmosphere at 1600℃ in a tunnel kiln;
3. Production of thermal shock-stable magnesia-chrome bricks
The production process of thermal shock-stable magnesia-chrome bricks is characterized by increasing the critical particle size and reducing the fine powder content in the chromite particles to improve the thermal shock stability of the product.
4. Production of thermal shock-stable chromium-magnesium bricks
When the ratio of chromium ore to sintered magnesia sand is 50% each, the product has great thermal shock stability.
