Brief introduction of magnesia-carbon brick raw material

 1. Fused magnesia sand: it is an alkaline refractory made of natural magnesite, light fired magnesia or sintered magnesia fused by an arc furnace. Fused magnesia main crystal phase of periclase, melting point is 2800 ℃, 1600 ℃ sublimation in vacuum, in reducing atmosphere above 2000 ℃ sublimation, is greater than 3.40 g/cm3 density, porosity of 0% to 10%, 5.5 mohs hardness, resistance to basic slag erosion is very strong, stable chemical properties, under the high temperature of 1500 ℃ and other than the silica brick no or weak reaction between all kinds of refractory materials. The appearance should be clear after the complete melting crystallization, do not allow mixing with other magnesia or sundries.

2, Graphite: is a carbon as the main component of the natural mineral, it has high temperature resistance, heat conduction, electricity, lubrication, plastic and corrosion resistance and other properties. It is the main material containing carbon resistant material. The graphite used in refractory is flake graphite, which is divided into high purity, high carbon, medium carbon and low carbon graphite according to the fixed carbon content. The color is iron black, steel gray. The density is 2.09-2.23g/cm3 with a melting point of 3700℃±100℃(in vacuum), high thermal conductivity, small expansion coefficient, small elastic modulus, good lubricity, good conductivity, stable chemical properties, no reaction with acid, alkali and organic solvents at room temperature, and steel solution is difficult to wet, with good anti-erosion performance.

3. Phenolic resin: it is a non-aqueous organic binder for refractory materials. It is prepared by condensation of phenol (or cresol, dicresol, or resorcinol) with formaldehyde (or glycolaldehyde) under the action of catalyst.?

The main advantages are

(1) high carbonization rate (52%);

(2) good adhesion, high strength of the formed body;

(3) high bonding strength after burning;

(4) the rate of hardening can be controlled at room temperature;

(5) less harmful substances, can improve the operating environment.

According to heating properties or structural morphology classification, there are thermosetting phenolic resin and thermoplastic phenolic resin, according to product morphology classification, there are liquid phenolic resin and solid phenolic resin (granular and powder), according to the curing temperature classification, there are high temperature solidified type 130℃-150℃; There are medium temperature fixed type 105℃-110℃; There are room temperature solidified type 20℃-30℃.g material.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality changxing refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Brief introduction of magnesia-carbon brick raw material
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