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It is generally believed that the global high-end refractory market requires 98% MgO content in high-grade magnesia, 3.40 g/cubic centimeter volume density of sintered magnesia and 3.50 g/cubic centimeter volume density of fused magnesia. General fused magnesia market global steel, cement and other high-temperature industrial sectors of high-grade magnesia annual consumption of about 1 million tons.
The total annual output of sintered magnesia in China is about 4 million tons. Around 1980, China's cheap natural magnesia export volume soared, has occupied the international low-end magnesia market. Generally speaking, the supply of middle and low-end magnesia in the market exceeds the demand, so the output of this part of sintered magnesia should be controlled, especially the production of reburned magnesia should be gradually reduced. The quality of middle-grade magnesia and high-purity magnesia decreased obviously because of the decrease of ore grade and the rise of fuel and labor prices. In the future, the market demand for middle-grade and high-purity magnesia will increase, because the downward substitution of middle-grade magnesia, high-purity sand up to replace part of the trend has been obvious.
After more than 30 years of disorder mining, it is an indisputable fact that the quality magnesite ore has been reduced and the quality of magnesia has decreased. At present, relevant enterprises gradually realize the importance of ore flotation and purification, and it is an inevitable trend to popularize mineral processing technology. Starting from mineral processing, the ore grade is improved, the high activity light burned magnesia is produced by energy-saving and efficient light burning equipment, and the quality of high purity sand is improved by dry high pressure dry pellet and high temperature burning of clean fuel. It is necessary to explore new technology and process of magnesia production so as to produce high grade sintered magnesia with 98% MgO content and 3.40 g/cubic centimeter bulk density at low cost. The construction of large-scale production plants integrating mineral processing and production of high purity magnesia is in line with the development direction in the future.