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Address (Add): Nanzhao Tie Village, Pailou Town, Haicheng City, Liaoning Province
It is generally believed that the global high-end refractory market requires high-grade magnesia with a MgO content of 98%, sintered magnesia with a bulk density of 3.40 g/cubic centimeter and fused magnesia with a bulk density of 3.50 g/cubic centimeter. The annual consumption of high-grade magnesia in high-temperature industrial sectors such as steel and cement is about 1 million tons. The total annual output of sintered magnesia in China is about 4 million tons. Around 1980, the export volume of cheap natural magnesia in China increased sharply, and it has occupied the international middle and low-end magnesia market. Generally speaking, the supply of middle and low-end magnesia in the market exceeds the demand. The output of this part of sintered magnesia should be controlled, especially the production of re-burned magnesia should be gradually reduced. Due to the decline of ore grade and the rise of fuel and labor prices, the quality of mid-grade magnesia and high-purity magnesia has decreased significantly. In the future, the market demand for mid-grade and high-purity magnesia will increase, because the trend of mid-grade sand replacing reburned sand downwards and high-purity sand replacing part of fused sand upwards is obvious. After more than 30 years of disorderly mining, it is an indisputable fact that the quantity of high quality magnesite ore decreases and the quality of light burnt magnesia spheroidal magnesite decreases. At present, the related enterprises have gradually realized the importance of ore flotation and purification, and it is an inevitable trend to popularize mineral processing technology. Starting from beneficiation, the grade of ore is improved, high activity light-burning magnesia is produced by energy-saving and efficient light-burning equipment, and the quality of high purity sand is improved by means of dry high pressure dry ball and high temperature calcination of clean fuel. It is also necessary to explore new technology and process of magnesia production in order to produce high-grade sintered magnesia with 98% MgO content and 3.40 g/cubic centimeter bulk density at low cost. It is in line with the future development direction to build a large-scale production plant integrating mineral processing and production of high-purity magnesia. Improving the technology and equipment of fused magnesia, because the price of fused magnesia in China is very competitive, a large number of Western seawater magnesia production enterprises closed down. At present, China accounts for 90% of the world market of fused magnesia with MgO content > 98.5%, and its application is more extensive. However, the product has high energy consumption and needs high-grade raw materials. Therefore, the comprehensive promotion and improvement of technical equipment measures in fused magnesia industry will help to reduce energy consumption and control quality, which is the inevitable trend of future development.
At present, the main synthetic materials based on magnesium oxide in Liaoning Province are fused magnesia-chrome sand, sintered magnesia-calcium sand, sintered magnesia-alumina spinel sand and sintered magnesia-alumina-iron sand, with an annual output of more than 200,000 tons. Magnesium-calcium refractories have excellent performance, but their application is limited due to the hydration of CaO. Therefore, the waterproofing problem of magnesia-calcium refractories should be studied emphatically. It should be pointed out that MgO-CaO refractories have the effect of removing sulphur and phosphorus impurities in steelmaking due to the presence of CaO, while CaO is not possible without hydration, only to prevent its hydration. With the increase of environmental protection, chromium-containing refractories will withdraw from the market. It is imperative to research and produce alternative products. Therefore, high-quality synthetic magnesium materials such as MgO-Al2O3, MgO-CaO, MgO-ZrO 2, MgO-SiO 2, MgO-Fe2O3, MgO-CaO-FeO 2, MgO-CaO-FeO 2, MgO-Al2O3-ZrO 2, MgO-CaO-ZrO 2, MgO-Al2O3-FeO should be further developed and produced for different purposes. Generally speaking, magnesite as a non-renewable and indispensable strategic resource, restricting and reducing its mining and improving its resource utilization rate, is the focus of all related work in the future. Therefore, the state should greatly reduce the export quota of magnesia and limit the export of low value-added raw materials and ordinary magnesia products. At the same time, enterprises with mining resources and conditions are encouraged to carry out large-scale technological renovation and equipment renewal, or to diversify the exploitation of raw materials and concentrate on building a number of large-scale raw material bases. Mine rock stripping, purification of low-grade ore, construction of large-scale light-burning and calcining equipment, industrialization of new sand-making process require a large amount of funds and new technical support, and there are certain risks. I hope relevant departments of the state will give support to policies, funds, science and technology. Only by establishing large-scale raw material bases, adopting systematic advanced technology and forming economies of scale, and under the guidance of strong national policies and regulations, can it be possible to eliminate seriously polluted raw material production enterprises and realize the elimination of backward ones in accordance with the principles of market economy. As the largest production base of magnesia refractory raw materials in the world, China can achieve long-term, stable and sustainable development only by adhering to the effective and rational utilization of magnesite resources, adhering to the business philosophy of low carbon, low energy consumption, low emission, low pollution, unity of economic benefits, resources and environmental protection, adhering to scientific and technological innovation and adjusting product structure.