Electrofused magnesia refractory raw material industry is a typical resource-based industry. 1980s, since China’s reform and opening up, due to the rapid increase in demand for magnesia raw materials, the low threshold of access to primary raw material processing, resulting in the rational development of magnesia ore has been seriously damaged. Due to economic reasons, 97 electrofusion magnesia, magnesite special grade ore sells for about 5 times of the third-grade ore. The mining rough, mining rich abandoned the phenomenon of serious, resulting in a great waste of resources, and more serious is the mining stripping disorder. Or will be scattered mining of raw materials, concentrating on the construction of a number of large raw material base. Magnesium refractory raw materials industry is a typical resource-based industry.
Since China’s reform and opening up, due to the rapid increase in demand for magnesium raw materials, the low threshold of entry for primary raw material processing, resulting in the rational development of magnesite has been seriously damaged. High-grade natural magnesite, lightly burned magnesium oxide powder or other materials containing magnesium oxide are used as raw materials, which are melted in electric arc furnace and then naturally cooled to make magnesite crystals crystallize and grow from the melt. After cooling, remove the underfused material on the big block, the melt is electric fused magnesia. Underfused material can be returned to the electric arc furnace again.
At present, Liaoning province has opened the production limit of electrofusion magnesium kiln, Haicheng, Dashiqiao, Gaizhou and other places of electrofusion magnesia enterprises have resumed production, electrofusion magnesia market has been a certain relief, but the enterprise also said that because of just production, ore is also insufficient, production capacity should not be higher than before, and large enterprises in the sale of the same time also in the grasp of replenishment of inventory, electrofusion magnesia prices should not drop significantly.
The production process of electrofused magnesia is short and simple, but the equipment input and resource consumption is large. China’s electric fusion magnesia industry more than the use of electric arc furnace melting natural magnesite preparation electric fusion magnesia, production process technology and equipment backward, low power, small capacity, low efficiency, low automation, the production of electric fusion magnesia product grade is not high, resulting in low utilization rate of magnesium resources, environmental pollution is serious.