01. Frontier Overview
The ironmaking system includes sintering machines, coking and blast furnaces and their ancillary equipment. The proportion of lining materials gradually changing from shaped products to unshaped linings has been gradually increasing in recent years.
The belt sintering machine ignition furnace uses refractory plastics and high-aluminum refractory castables, and can also be made into prefabricated parts with phosphate refractory castables for hoisting construction. Use corundum castables for the ignition device and the top of the furnace, and use lightweight insulating castables or refractory fibers as linings for the parts of the furnace with good working conditions.
02. Damage to the burner can be repaired with spray paint
The heat insulation layer and covering layer of the coke oven roof are cast on-site with refractory castables. When the furnace head is damaged, it can be repaired with spray paint. In addition, dry coke quenching equipment also uses heavy or light refractory castables. The furnace door has been changed from heavy castables to semi-heavy castables. Because the furnace door is frequently opened, heavy castables are too heavy and are not conducive to For on-site use, changing to semi-heavy castables reduces the weight and also achieves thermal insulation effect.
03.What unshaped refractory materials to use?
The blast furnace is made of prefabricated blocks made of low-cement and high-aluminum castables for hoisting and masonry construction, and can be constructed with resin-bonded aluminum-carbon unburned bricks. The water-cooled walls of large blast furnaces are constructed with silicon carbide castables. The furnace bottom cushion and surrounding brick joints are made of low-cement castables and silicon carbide fillers. When the furnace lining is damaged, refractory pressed mud and refractory spray paint are used to repair it. The filling between the furnace hearth and the furnace wall is filled with waterless mud and is injected in two steps. In recent years, there have also been spray coatings directly combined with silica sol, which can be directly sprayed and used as linings. This is a new technology. Although not many manufacturers use it, the effect is very good.
Blast furnace tapholes are generally blocked with loose anhydrous clay to ensure stable taphole tapping and smooth opening. The blast furnace tap trench is constructed with iron point castables, main trench castables, low cement castables for the first layer, other parts are constructed with self-flowing refractory castables and no-bake castables, and the remaining trench is constructed with no-bake ramming materials. Ramming construction.
04. Medium and small hot blast stove lining
In recent years, small and medium-sized hot blast furnace linings and hot blast stove burners have been built with prefabricated blocks of refractory castables or cast on site. The dome can also be cast with corundum castables to form a working lining. Moreover, the repair can also be carried out outside the furnace roof with corundum castable.
The furnace body of a large hot blast furnace is lined with the furnace shell. You can spray a light spray paint with 1.0 Bicarbonate. The dome 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.
05.Conclusion
In addition, blast furnace hot blast surrounds and branch pipes, air supply ducts, hot blast valves and other parts have no longer been pre-built with various types of red stone products in recent years. The production is troublesome, and the construction is more troublesome. Refractory castables added with andalusite are used. The overall pouring effect is also quite good. Moreover, during the emergency repair period, hot patching can be performed directly without delaying the construction period. The torpedo tanks and mixing furnaces are partially or entirely made of castables, and refractory spray paint is used for repairs.
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