Which is the best magnesia

Magnesia is calcined from magnesite, brucite or magnesium hydroxide extracted from seawater at high temperature. It is the general name of the products that magnesite and other magnesia materials reach the sintering process after high temperature treatment. Magnesia produced by calcination with natural magnesite as raw material by one or two step calcination process with high-temperature equipment such as shaft kiln and rotary kiln is called sintered magnesia; The price of concentrate powder, which is made of magnesite and other materials after being melted in the electric arc furnace to the molten state and cooled, is called seawater magnesia.

Magnesia is one of the refractory materials, which is used to manufacture various magnesia bricks, magnesia-alumina bricks, ramming materials, furnace repair materials, etc., and contains many impurities, which is used to pave the steel furnace bottom, etc. High-purity magnesia is produced by flotation purification of natural magnesite ore and calcination in light burning, fine grinding, ball temperature oil shaft kiln. It is an indefinite refractory material for brick making.

The properties of magnesia can be divided into chemical properties and physical properties. The chemical properties of magnesia mainly refer to that magnesia is mainly composed of periclase MgO, periclase is one of the common minerals in cement clinker, and periclase can coexist with the four main minerals C3S, C2S, C3A and C4AF in cement clinker. Therefore, periclase has good corrosion resistance for cement clinker.

Magnesite beneficiation can only remove SiO2. If high purity is desired, only ores with low Fe2O3, Al2O3 and CaO can be selected to remove SiO2. If we consider the comprehensive utilization of resources and improve the grade, we can only choose high silicon ore flotation. 98 fused magnesia

The higher the purity of high-purity magnesia, the less the binding phase and the more unstable it is, and it is not necessarily suitable for making refractory materials.

From the perspective of market demand, high-purity magnesia

What is the market demand for magnesia with MgO ≥ 98%? The variety structure of refractory raw materials should conform to the demand structure of the raw material market. From the perspective of the demand of steelmaking converter, except for the products produced by high-purity magnesia with MgO ≥ 98% at the trunnions on both sides of the converter and the slag line. The refractory products produced by high-purity magnesia need not be used in other areas.