Liaoning magnesia chrome brick

Another example is phosphate refractory castable Liaoning magnesia chrome brick can be widely used in heating furnace and soaking furnace for heating metal, but also can be used in coke oven and cement kiln directly contacting with materials. In some parts of metallurgical furnace and other vessels in direct contact with slag and molten metal, the use of high-quality phosphate refractory castable can also achieve good results.

They are mainly siliceous raw materials, such as quartz, tridymite, cristobalite, chalcedony, chert, opal, quartzite, silica sand and diatomite. These siliceous raw materials contain at least 90% SiO2 and 99% pure raw materials. Siliceous raw materials are acidic in high temperature chemical dynamics. When metal oxides exist or contact with them, they play a chemical role and combine to form fusible silicates. Therefore, if a small amount of metal oxide is contained in the silicon material, its heat resistance will be seriously affected. Magnesia carbon brick is made of magnesia, reburning magnesia, fused magnesia, high purity magnesia, high quality graphite and bauxite additives. The price and performance of magnesia carbon brick are closely related to the graphite content in the brick. With the increase of graphite content, the strength of the brick decreases, the thermal expansion rate decreases, and the residual expansion increases. Magnesia chrome brick manufacturer

Therefore, the graphite content in the brick should be controlled at about 20%. MgO-C brick has low wettability to molten slag, and has excellent spalling resistance and corrosion resistance. It is suitable for slag line of ladle, especially for multi furnace continuous casting. In order to meet the needs of clean steel production, the application of magnesia carbon brick has been expanded from slag line to side wall in ladle refining. The main raw materials of reinforced magnesia carbon brick and tapping hole are fused magnesia and sintered magnesia with high purity, high bulk density, high CaO / SiO2, low porosity, crystallization; high purity flake graphite is used for graphite; phenolic resin, which can form inlaid structure at high temperature, is used as binder. Japan, as the origin country of magnesia carbon fixed products in the world, has shut down most of its domestic products Magnesia carbon brick production line, some small carbon brick production lines, have changed their functions and used as new technology research and development. China has the world's best magnesium ore and graphite resources, coupled with China's low labor costs, so that China's magnesium carbon shaped products have a very strong competitiveness in the world market. At present, there are nearly 200 magnesia carbon brick production enterprises in China, with an annual total output of more than 2 million tons. The reinforced magnesia carbon brick and tapping hole are in the domestic magnesia chrome brick manufacturers

Liaoning magnesia chrome brick

The annual domestic market demand is more than 600000 tons, and there are also nearly 50 cubic tons of export forecast in the world. Metal and non oxide magnesia carbon unburned bricks and tapping bricks replace ordinary bricks, which has huge market space and potential. The open porosity of sintered oxide refractories is about 12%, most of which can be filled with tar pitch or resin. Due to the relatively low volatilization and density of volatiles, the residual carbon rate of these products is about 2% ~ 3%. The alumina magnesia carbon brick was developed by using special bauxite clinker, fused magnesia, phenolic resin and high purity graphite as the main raw materials and various additives. It was applied to the 80 ton converter ladle of Xuanhua Iron and Steel Co., Ltd, Wet gunning is a method of mixing refractory aggregates, binders, additives and water into a certain consistency slurry, and then the slurry is sprayed onto the gunning surface with compressed air magnesia alumina carbon brick by gunning machine. It is characterized by simple operation, high adhesion and rapid sintering. However, due to the large water content and fine grain size, the shrinkage is also large. At the same time, due to the thin gunning layer, the durability is not very good.

Flame gunning is a repair method that uses compressed oxygen to transport refractory aggregate, flux or heating agent mixture to the nozzle, and then burns it with high calorific value fuel, and instantly heats the surface of magnesia alumina carbon brick fire aggregate particles to molten or semi molten state, and then spray adheres to the furnace lining. The gunning layer obtained by this construction method has compact structure, high strength, corrosion resistance and erosion resistance Strong ability, solid and durable. However, the cost of flame gunning device is high, the technology is complex, and the construction energy consumption is also large