- Time:Mar 14, 2023
The ironmaking system includes sintering machines, coking and blast furnaces and their ancillary equipment. The proportion of lining materials from shaped products to unshaped linings has gradually increased in recent years.
The ignition furnace of the belt sintering machine is made of refractory plastic and high alumina refractory castables, and phosphoric acid refractory castables are also used to make prefabricated parts for hoisting construction. Corundum castables are used for the ignition device and the furnace top, and light heat-insulating castables or refractory fibers are used as linings for parts of the furnace with good working conditions.
The heat insulation layer and the cladding layer of the coke oven roof are poured on-site with refractory castables. When the furnace head is damaged, it can be repaired with spray paint. In addition, CDQ equipment also uses heavy or light refractory castables, and the furnace door has changed from heavy castables to semi-heavy castables. Because the furnace door is frequently opened, too heavy heavy castables are not conducive to For on-site use, changing to a semi-heavy castable not only reduces the weight, but also improves the insulation effect.
Blast furnaces use low-cement and high-alumina castables to make prefabricated blocks for hoisting and masonry, and resin-bonded aluminum-carbon non-burning bricks can be used for masonry. Silicon carbide castables are used for the construction of large-scale blast furnace water walls, low cement castables and silicon carbide fillers are used for the furnace bottom cushion and surrounding brick joints, and refractory press-in mud and refractory spray paint are used for repairs when the furnace lining is damaged. The filling between the furnace hearth and the furnace wall is injected twice with anhydrous pressure-in mud. In recent years, there are also spray coatings that are directly combined with silica sol, and are directly sprayed as linings. This is a new technology, although not many manufacturers use it, but the effect is very good.
Blast furnace tapholes are generally blocked with loose anhydrous taphole mud to ensure stable tapping and smooth opening of the taphole. Castables for iron drop points and main trenches are used for blast furnace tapping trenches, low-cement castables are used for permanent layers, self-flowing refractory castables and non-baking castables are used for masonry in other parts, and non-baked ramming materials are used for residual trenches Carry out pounding construction.
In recent years, the inner lining of small and medium-sized hot blast stoves and hot blast stove burners have been built with refractory castable prefabricated blocks or cast on site, and the dome can also be cast with corundum castable as a working lining. Moreover, the repair can also be repaired outside the furnace roof with corundum castables.
The furnace body of a large hot blast stove is lined by the furnace shell, which can be sprayed with 1.0 ratio of light-weight spray paint, and the spherical top can also be sprayed with a layer of acid-resistant spray paint to form an integral lining to resist the penetration and erosion of the furnace shell by sulfur-containing flue gas.
In addition, blast furnace hot blast surrounding pipes and branch pipes, air supply pipes and hot blast valves and other parts have not been pre-built with various types of red stone products in recent years. The production is troublesome, and the construction is even more troublesome. The refractory castable with andalusite Overall pouring, the effect is quite good. Moreover, when the wind is off for rush repair, it can be repaired directly by hot patching, without delaying the construction period. Part or all of the torpedo tank and mixed iron furnace are made of castables, and refractory spray paint is used for repairs.
The high-alumina castable produced by ZHENJIN REFRACTORIES adopts modern ultra-fine powder and low CA cement addition technology, which improves the medium temperature strength and high temperature stability. The dense microstructure ensures the stability of the overall lining. The service life of high-alumina castables is 2-3 times that of traditional castables, and it has the characteristics of high density, high strength and low wear.
ZHENJIN REFRACTORIES is committed to the research and development of refractory materials in cement, lime, non-ferrous metals, steel, glass and chemical industries, technical solution design, construction and supply of supporting products and other one-stop general contracting services, integrating production, sales, research and export Kiln overall solution service provider. The service chain runs through the life cycle of the entire project, including preliminary consultation, scheme design, R&D and production, furnace construction and safety production. Through the optimized combination of various brand products, it can meet different process requirements and create value for customers.