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Lime kiln preheaters are used to “preheat” the limestone prior to the limestone being fed into the kiln. Hot kiln exit gases that might otherwise be exhausted to the environment are used to heat the limestone. This improves operating efficiency and reduces operating costs.

Lime preheater floors are very abrasive service environments. Limestone is preheated and pushed along the floor by hydraulic rams. This action is extremely abrasive, and wear on the refractory floor is common. The use of high-wear-resistant refractories is a necessity. HarbisonWalker International offers a number of products containing silicon carbide and alumina-zirconia-silica (AZS), such as HARBIDE, THOR® AZS, and THOR® AZSP. Our THOR® product line offers superior wear resistance in a variety of application methods. THOR® AZS CASTABLE and THOR® AZSP PLUS both offer outstanding wear resistance for preheater floors.

The limestone leaves the preheater and enters the kiln through the transfer chute. Abrasion and buildup are the main concerns within this area. Limestone continually falls through the transfer chute, where it can erode refractories easily unless the right refractories are installed in this area. HWI offers abrasion-resistant products such as THOR® AZS, THOR® 60, and VERSAFLOW® 80 C PLUS, which are all outstanding products for this application.

The bullnose is a general term that refers to a corner or edge. In preheaters, the corner connects the flat surface of the ceiling to the vertical wall of the internal chamber of the preheater. This area is prone to failure from abrasion due to dust-laden air and buildup, causing air and material-flow restrictions. HWI’s THOR® 30 products contain silicon carbide and offers a high degree of wear and buildup resistance in an economical package. THOR® AZS products offer our highest degree of wear and buildup resistance through the use of both silicon carbide and zirconia. The result is an outstanding product that delivers protection in the severest of service environments.

The throat is the top portion of the transfer chute in the preheater floor. Again, this is an area of high abrasion, and refractory choices must take this into consideration. THOR® AZS, THOR® 60, and VERSAFLOW® 80 C PLUS products offer the abrasion-resistant properties ideal for this environment.

Products
Preheaters

Product SDS
‘SAIRBOND A dry, air-setting, fireclay mortar
‘SAIRSET A wet, air-setting, fireclay mortar
‘SAIRSET 3000 A high alumina air-setting mortar English
CLIPPER® DP A super duty fireclay brick
CORAL® BP A burned, phosphate bonded 80% alumina brick
CORAL® PLASTIC 28-82 ADTECH® An 82% alumina, phosphate bonded refractory plastic English
D-CAST® 85TMCC CASTABLE An ultra-low cement, high alumina castable English
EXPRESS®-27 PLUS A 50% alumina, cement bonded, self flowing castable English
GREENLITE®-HS A high strength insulating firebrick
GREENTHERM 23 LI A 2300°F rated insulating firebrick
HARBIDE A silicon carbide brick English
HARWACO BOND (DRY) A 50% alumina, air setting, dry mortar English
HARWACO BOND (WET) A 50% alumina, air setting, wet mortar English
KALA® A 50% alumina brick
KRUZITE®-70 A 70% alumina brick
KX-99® A high fired, super duty fireclay brick
KX-99®-BF A high fired, super duty fireclay brick English
MAGNEL® RS A magnesia spinel, burned brick
MAGNEL® ULTRA A magnesia spinel, burned brick English
MAGNEL® ULTRA AF A magnesia spinel, burned brick English
NARCON® 65 CASTABLE A 65% alumina, low-cement castable English
NARMAG® 95 CASTABLE A 95% magnesia castable English
NARMAG® CB MORTAR A chemically bonded, magnesia based mortar English
ON-LINE® 60 A 60% alumina, low-cement castable designed for rapid curing English
SHOT-TECH® 60Z A high alumina, low-cement, zirconia containing shotcrete mix English
SUPER NARMAG® B A 98% magnesia, burned brick
THOR® AZS-PT ADTECH® A 14% zirconia, pumpable, low moisture castable English
TUFSHOT® LI PLUS A fireclay based, conventional-cement, low iron gunning mix
UFALA® A 60% alumina brick shape English
ULTRA-GREEN® SR An 86% alumina, ultra-low cement castable English
VERSA-TECH 60G ON-LINE A 60% alumina, lower-cement, gunning mix English
VERSA-TECH 60G ON-LINE A 60% alumina, lower-cement, gunning mix English
VERSA-TECH 60G ON-LINE A 60% alumina, lower-cement, gunning mix English
VERSAFLOW® 45 C PLUS A coarse, fireclay-based, low-cement castable for high-abrasion environments
VERSAFLOW® 55/AR C PLUS A 55% alumina, coarse aggregate, low-cement castable English
VERSAFLOW® 60 PLUS A 60% alumina, low cement castable
VERSAFLOW® 80 C PLUS An 80% alumina, coarse aggregate, low-cement castable
VERSAGUN® 60 Z ADTECH® A high alumina, zirconia containing, low-cement gunning mix

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