Magnesite beneficiation can only remove SiO2, if the pursuit of high purity, can only choose Fe2O3, Al2O3 and CaO very low ore to remove SiO2 to achieve the purpose. If we consider the comprehensive utilization of resources and upgrade the grade, we can only choose high-silicon ore flotation.
The higher the purity, the less the combination, the more unstable, and not necessarily suitable for making refractories.
Sand from the market demand point of view
How big is the market demand for magnesia with MgO≥98%? The variety structure of refractory raw materials should meet the demand structure of the raw material market, in order to meet the demand of steel converter, in addition to the converter two side trunnion and slag line parts need to use MgO≥98% of high purity magnesite production products. Other areas do not need to use high purity magnesia production of refractory products.
Magnesia is a kind of magnesia raw materials such as magnesite by shaft kiln, rotary kiln and other high temperature equipment calcination or two-step calcination process to reach the product of sintering degree. There are different classifications of magnesia, among which the magnesia fired with natural magnesia ore as raw material is called sintered magnesia; To magnesite and other raw materials by electric arc furnace melting to reach a molten state after cooling is called; The magnesium oxide extracted from seawater is called seawater magnesia.
Seawater magnesia and sintered magnesia. Foreign high purity magnesia production technology advanced, high purity, but because of the high production cost did not form the overall advantage.
The market of high purity magnesia is stable, the downstream demand has not changed, and the manufacturer's quotation continues to be stable.
Magnesia can be divided into natural magnesia and seawater magnesia or synthetic magnesia two categories. Natural magnesia mainly comes from natural magnesia ore, but because of the quality of raw ore, it is difficult to obtain high purity products, so far, seawater magnesia has become the main source of magnesia used in industrial developed countries. The theoretical content of MgO in magnesite is 47.3%, and the remaining impurities are CaO, SiO2, iron, etc.
