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Corundum Plastic Refractory: Properties, Applications & Construction Guide
Product Introduction
Corundum plastic refractory is a high‑performance monolithic unshaped refractory material, compounded of fused or sintered corundum aggregates, fine alumina powder, micro‑powders, composite binders and functional additives. It maintains stable plasticity under normal storage conditions, and can be directly rammed, tamped or trowelled on‑site without formwork. After heating and sintering under working temperature, it forms a dense and integrated furnace lining.
Compared with pre‑fired refractory bricks and conventional castables, corundum plastic refractory shows unique advantages for irregular furnace areas and emergency lining repair. It effectively reduces risks of slag penetration along brick joints and partial lining spalling, and shortens on‑site construction and overhaul time for high‑temperature equipment.
Core Performance Characteristics
- Outstanding abrasion resistance: Corundum‑based raw materials bring high hardness, resisting long‑term particle scouring, ash impact and material wear in heavily loaded furnace zones.
- Good thermal shock resistance: Optimized grain composition relieves thermal stress during frequent temperature fluctuation, lowering cracking and peeling probability under cyclic heating and cooling.
- Superior slag and alkali corrosion resistance: Stable chemical property against molten slag, alkali vapour and high‑temperature corrosive medium, keeping lining structure intact for long‑term operation.
- Excellent workable plasticity at ambient temperature: No mixing water required for construction. Workers can ram and shape the material freely for curved surfaces, corners and special‑shaped positions where bricks are hard to install.
- High hot strength and volume stability: Low permanent linear change after sintering, no obvious shrinkage or expansion during continuous high‑temperature service.
Typical Application Scenarios
Corundum plastic refractory is widely used in industries where high abrasion, thermal shock and local rapid repair are required.
Power Industry
Circulating fluidized bed boiler cyclone separator, return valve, dense‑phase zone, water‑wall protective layer, ash hopper lining and other severely scoured positions.
Circulating fluidized bed boiler cyclone separator, return valve, dense‑phase zone, water‑wall protective layer, ash hopper lining and other severely scoured positions.
Metallurgical Industry
Partial repair for ladle, steel trough, tap‑hole area, slag line zone; lining parts for non‑ferrous smelting furnaces contacting molten metal and slag.
Partial repair for ladle, steel trough, tap‑hole area, slag line zone; lining parts for non‑ferrous smelting furnaces contacting molten metal and slag.
Cement & Lime Industry
Kiln burner pipe, nose ring, transition zone and other composite wear‑and‑thermal‑impact working areas.
Kiln burner pipe, nose ring, transition zone and other composite wear‑and‑thermal‑impact working areas.
Petrochemical & Waste Incineration
Reformer lining, burner block, incinerator local repair parts under complex high‑temperature corrosive atmosphere.
Reformer lining, burner block, incinerator local repair parts under complex high‑temperature corrosive atmosphere.
Construction Key Points
Anchor nails shall be pre‑welded on the furnace steel shell before construction, and the spacing shall be set according to actual lining thickness.
Construct layer by layer by ramming to ensure sufficient bulk density. For repair projects, remove all loose residual refractory and clean the base surface completely before applying corundum plastic refractory.
Make vent holes on the finished lining surface to discharge internal moisture during heating‑up. Strictly follow the standardized heating curve; rapid temperature rise is forbidden to prevent cracking and spalling of the plastic refractory lining.
Customized Solution
We supply multiple grades of corundum plastic refractory with different alumina content to fit different working temperature, abrasion and corrosion conditions. Raw material grading and binder formula can be adjusted based on customers’ real furnace operating parameters. On‑site technical support for installation and maintenance is available. Please contact us for technical data sheet and quotation.
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