Hello, welcome to the official website of Liaoning Hongyu Refractories Group Co., Ltd.
Liaoning Hongyu refractory Group Co., Ltd.
Address: two room village, Guan Tun Town, Dashiqiao, Liaoning, China
Web site: www.hy-ref.com
Contact: high general
Zip code: 115100
Magnesia carbon brick plant, magnesia ball, gunning material, magnesia brick factory, castable plant, magnesia chrome brick factory
The large amount of silica brick and clay brick. Silica brick is a siliceous product containing more than 93% SiO2. The raw materials used include silica and waste silica bricks. The corrosion resistance of silica brick is strong, but it is easily eroded by alkaline slag, and its load softening temperature is very high, it is close to its refractoriness, and the volume does not shrink or even expand slightly after repeated calcination, but the resistance to thermal shock is poor. Silica bricks are mainly used in coke oven, glass furnace, acid steelmaking furnace and other thermal equipment. Clay brick contains 30% ~ 46% alumina, which is a refractory clay as the main raw material, the refractoriness is 1580~1770 degrees C, and it has good thermal shock resistance. It is a weak acid refractory material. It has corrosion resistance to acid slag and is widely used. It is a kind of refractory material with the largest production capacity.
The main crystalline phase in high alumina products is mullite and corundum. The content of corundum increases with the increase of alumina content. The corundum with more than 95% alumina is a kind of high quality refractory material. Chromium bricks are mainly made of chrome ore, and the main phase is chromite. Its corrosion resistance to steel slag is good, but its thermal shock resistance is poor, and the deformation temperature of high temperature load is low. Chrome magnesite bricks made of chrome ore and magnesia at different proportions have good thermal shock resistance and are mainly used as top bricks of basic open hearth furnace.
Carbonaceous products are another kind of neutral refractories. According to the composition of the carbon containing raw materials and the mineral composition of the products, it is divided into three types: carbon bricks, graphite products and carbonized siliceous products. The carbon brick is fired by using high-grade petroleum coke as raw material, tar and bitumen as adhesive, and air separation at 1300 C. Graphite products (except natural graphite) were made of carbon materials in an electric furnace at 2500~2800 degree graphitization. Silicon carbide products are made of silicon carbide as raw material, and clay, silicon oxide and other binders are sintered at 1350~1400 degrees. Silicon carbide and silicon powder can also be made into silicon nitride silicon carbide products under nitrogen atmosphere in an electric furnace.
Carbonaceous products have low thermal expansion coefficient, high thermal conductivity, good thermal shock resistance and high temperature strength. It is not softened at high temperature for a long time. It is not eroded by any acid and alkali. It has good salt resistance. It is also not wetted by metal and slag. It is light quality. It is a high quality high temperature resistant material. The disadvantage is that it is easy to oxidize at high temperature and is not suitable for use in oxidizing atmosphere. Carbonaceous products are widely used in lining of high temperature furnace (hearth, hearth, lower part of furnace body) and lining of nonferrous metal furnace. Graphite products can be used as reactor tanks and petrochemical autoclave lining. Silicon carbide and graphite products can also be used to make crucible for smelting copper with gold and light alloy.
It is represented by magnesia products. It contains more than 80% to 85% of Magnesium Oxide, and the main crystal phase is calcite. The main raw materials for magnesia brick production are magnesite and magnesia, which are calcined from seawater and calcined at high temperature. It has a good resistance to alkaline slag and iron slag. The melting point of pure Magnesium Oxide is as high as 2800 degrees. Therefore, magnesia brick has higher refractories than clay bricks and silica bricks. Since the mid 1950s, the production of clay brick and silica brick has been reduced because of the use of oxygen blowing converter steelmaking and the use of alkaline flat furnace top, the production of alkaline refractory has gradually increased. Basic refractories are mainly used in open hearth, oxygen converter, electric furnace, non-ferrous metal smelting and some high temperature thermal equipment.