The higher the purity of high-purity magnesia, the less the binding phase ！
Magnesite beneficiation can only remove SiO2. If you pursue high purity, you can only choose ores with very low Fe2O3, Al2O3 and CaO to remove SiO2 to achieve the goal. If considering the comprehensive utilization of resources and upgrading the grade, we can only choose high-silicon ore flotation.
The higher the purity of high-purity magnesia, the less the binding phase, the more unstable it is, and it is not necessarily suitable for refractory materials.
High-purity magnesia from the perspective of market demand
How big 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 for steelmaking converters, high-purity magnesium with MgO≥98% is required except for the trunnions and slag lines on both sides of the converter. Products produced from sand. Other areas do not need to use refractory products produced by high-purity magnesia.
It is a general term for the sintered products of magnesia raw materials such as sand-based magnesite after one-time calcination or two-step calcination process in high-temperature equipment such as shaft kiln and rotary kiln. There are different classifications of magnesite, among which the magnesite fired with natural magnesite as raw material is called sintered magnesite; the magnesite with magnesite etc. ; Extracted from seawater made of magnesium oxide called seawater magnesia.
Seawater magnesia and sintered magnesia. Foreign high-purity magnesia has advanced production technology and high purity, but due to high production costs, it has not formed an overall advantage.
The high-purity magnesia market is operating stably, the downstream demand has not changed yet, and manufacturers’ quotations have also remained stable.
Magnesia can be divided into two categories: natural magnesia and seawater magnesia or synthetic magnesia. Natural magnesite mainly comes from natural magnesite, but due to the restriction of raw ore quality, it is difficult to obtain high-purity products. So far, seawater magnesite has become the main source of magnesite used in industrialized countries. The theoretical content of MgO in magnesite is 47.3%, and the remaining impurities include CaO, SiO2, iron and so on.