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Choosing an alumina wear lining
Six questions decide most wear-lining designs. Each rule below says where it applies and where it stops applying. The rules come from Zibo factory practice and our team’s experience inside the industry; any value that matters is confirmed per order.
01 · What is wearing the surface?
Sliding abrasion — material moving along the surface — is what alumina tiles do best. Impact — lumps striking the surface — cracks bare ceramic; it needs rubber behind the ceramic. Most equipment has both, in different places.
- Sliding only → plain or weld-on tiles.
- Impact with sliding → rubber-ceramic panels at the impact point, tiles downstream.
- Heavy impact from large lumps and little sliding → alumina may not be the right material; ask us.
02 · How hot, and how fast does it change?
Alumina ceramics are fired at very high temperature and tolerate high steady temperatures. Two things limit a design instead:
- The fixing. Adhesives have temperature ratings far below the ceramic's. Above the rating, use welded tiles, interlocking shapes or inserted tubes.
- Thermal shock. Rapid heating, cooling or quenching can crack alumina. Ducts that swing between ambient and several hundred °C are usually better with a refractory lining.
Always give us the maximum temperature and how quickly it changes.
03 · What else is in the stream?
Alumina resists most acids and alkalis; exceptions include hydrofluoric acid and hot, concentrated alkalis. In practice the adhesive, the rubber or the steel stud is usually the part that limits chemical resistance. Tell us whether the duty is wet or dry and what acids, alkalis, oils or solvents are present.
04 · What shape is the surface?
- Flat or gently curved → plain or weld-on tiles; large silo walls can take flat tiles.
- Tightly curved → mosaic or hexagonal mats, or shaped tiles.
- Pipes → lined spools, lined elbows, inserted tubes.
- Complex parts → custom shapes to drawing.
05 · Which grade?
92 % alumina is the standard for linings and most grinding media. 95 % wears more slowly and costs more; choose it where wear is severe or purity limits are strict. For grinding media, 68 % and 75 % are economy grades where some contamination is acceptable.
06 · How thick?
Thickness follows from today's wear rate and the interval you want between relines. Send the current lining, its thickness and service life; we propose a thickness and show the trade-off against weight and cost. We do not quote a service life without that history.
Decision table
| Duty | Wear mode | Temperature | Recommended | Fixing | Watch for |
|---|---|---|---|---|---|
| Chute bed, hopper | Sliding | Ambient | Plain tiles, 92 % | Bonded | Vertical faces → weld-on |
| Chute walls, overhead | Sliding | Ambient to warm | Weld-on tiles | Stud + cap | Stud chemistry |
| Impact point | Impact + sliding | Ambient | Rubber-ceramic panels | Bolted | Rubber grade; oils |
| Slurry bends, tees | Sliding by particles | Ambient | Lined elbows, 92–95 % | Bonded or welded | Particle size, surges |
| Coarse slurry with surges | Impact + sliding | Ambient | Rubber-ceramic pipe | Vulcanised | Temperature |
| Pneumatic powder lines | Sliding | Ambient to warm | Lined bends or inserted tubes | Bonded / inserted | Adhesive rating |
| Hot fly ash | Sliding | Hot, steady | Welded tiles or inserted tubes | Mechanical | Not bonded unless rated |
| FGD, wet corrosive | Sliding, wet | Warm, fluctuating | Weld-on tiles | Stud + cap | Stud and cap chemistry |
| Hot gas, rapid swings | — | Cycling | Usually refractory, not alumina tiles | — | Thermal shock |
| Ball mill | Tumbling abrasion | Ambient | Lining bricks + balls, 92–95 % | Laid in mortar | Iron contamination |
When alumina is the wrong answer
Poor fits for alumina tiles
- Hot gas ducts and equipment with rapid temperature swings or quenching.
- Large lumps falling from height onto bare ceramic, with little sliding.
- Duties where hydrofluoric acid or hot concentrated alkali is present.
- Parts that flex or deform in service, which crack rigid ceramic.
If your duty looks like one of these, tell us. We would rather say so than sell the wrong lining.
What we ask for
- Surface to be linedA drawing, or photos with the main dimensions
- Material handledType, particle or lump size, moisture
- TemperatureMaximum, normal, and how quickly it changes
- ImpactDrop height and lump size, if material falls onto the surface
- ChemistryWet or dry; acids, alkalis, oils or solvents present
- Current liningWhat it is, how long it lasts and how it fails
- QuantitySquare metres, pieces or number of parts
Want a second opinion on a lining?
Send the duty and the current design. We will tell you what we would change, and why.
- inquiry@vuulcan.com
- Reply
- Within one business day (GMT+8)
- Based in
- Zibo, Shandong · FOB Qingdao