$Rotary lime kiln lined with refractory brick$

Products — Lime industry

Linings for rotary and shaft lime kilns

From the preheating zone and transition to the burning zone, kiln mouth and coal injection pipe — wear-resistant brick and castables engineered for limestone abrasion, thermal cycling and lime-rich slag attack.

11: Lime-kiln product families
1780 °C: Maximum service temperature
100k t: Annual production capacity
1979: Making refractories since

Product catalogue

Grades & technical data

Shaped bricks

Zirconia-mullite composite wear-resistant brick

ZrO2-reinforced mullite brick with a very low wear coefficient — used in the preheating and transition zones of lime kilns where abrasion and thermal cycling coincide.

Model	RTSA-ZTM
Al2O3 (%) ≥	78
Fe2O3 (%) ≤	1.5
ZrO2 (%) ≥	6.0
Apparent porosity (%) ≤	18
Compressive strength at room temperature (MPa) ≥	100
Bulk density (g/cm³) ≥	2.7
Load softening point (°C)	1680
Thermal shock stability (times) ≥	15
Wear resistance coefficient (cc) ≤	4

Shaped bricks

High alumina high-strength wear-resistant brick

Dense high-alumina brick for lime kiln preheater and cooler zones subject to continuous mechanical abrasion from limestone charge.

Model	Value
Al2O3 (%)	63–67
Apparent porosity (%)	22–23
Compressive strength (MPa)	43–47
Bulk density (g/cm³)	2.35
Maximum service temperature (°C)	1350

Shaped bricks

Magnesia alumina spinel brick

Chrome-free spinel brick for the burning zone of rotary lime kilns — excellent thermal shock resistance and resistance to lime-rich slag attack.

Model	RTSA-LJ85	RTSA-LJ80	RTSA-LJ75
MgO (%) ≥	85	80	75
Al2O3 (%)	5–10	8–15	8–15
0.2 MPa load softening point (°C) ≥	1700	1700	1650
Compressive strength at room temperature (MPa) ≥	40	40	40
Apparent porosity (%) ≤	18	18	19
Thermal shock stability (1100 °C water cooling, times) ≥	20	20	15

$Wear-resistant and erosion-resistant refractory castable$

Castables

Wear-resistant and erosion-resistant refractory castable

High-alumina low-cement castable for lime kiln hoods, ducts and cyclones exposed to dust-laden gas streams up to 1600 °C.

Model	RTSA-17M
Maximum service temperature (°C)	1600
Al2O3 (%) ≥	75
Bulk density 110 °C×24 h (g/cm³) ≥	2.75
Flexural strength 110 °C×24 h (MPa) ≥	10
Flexural strength 1100 °C×3 h (MPa) ≥	11
Compressive strength 110 °C×24 h (MPa) ≥	100
Compressive strength 1100 °C×3 h (MPa) ≥	110
Linear change after firing 1100 °C×3 h (%)	±0.4

Castables

Anti-stripping castable for kiln mouth

Al2O3–SiC bonded castable engineered against spalling and thermal shock at the discharge end of the lime kiln.

Model	RTSA-PA80K
Maximum service temperature (°C)	1650
Al2O3 + SiC (%) ≥	80
SiO2 (%) ≥	10
Bulk density 110 °C×24 h (g/cm³) ≥	2.60
Flexural strength 110 °C×24 h (MPa) ≥	7
Flexural strength 1100 °C×3 h (MPa) ≥	7
Compressive strength 110 °C×24 h (MPa) ≥	80
Compressive strength 1100 °C×3 h (MPa) ≥	80
Linear change after firing 1100 °C×3 h (%)	-0.1 to -0.5
Reference water for installation (%)	5–6

Shaped bricks

Direct bonded magnesia chrome brick

Direct-bonded MgO–Cr2O3 brick with high hot strength for severe burning-zone conditions and aggressive alkali/lime slag.

Model	RTSA-DMC12	RTSA-DMC9
MgO (%) ≥	60	70
Cr2O3 (%) ≥	12	9
SiO2 (%) ≤	3.2	2.8
0.2 MPa load softening point (°C) ≥	1600	1650
Compressive strength at room temperature (MPa) ≥	35	40
Apparent porosity (%) ≥	19	19
Bulk density (g/cm³) ≥	3	2.98
Thermal shock stability (1100 °C water cooling, times) ≥	10	10

Castables

New plate-shaped corundum castable

Tabular corundum castable rated to 1750 °C for the hottest monolithic sections of lime and calcining kilns.

Model	RTSA-AM92
Maximum service temperature (°C)	1750
Al2O3 (%) ≥	90
Bulk density 110 °C×24 h (g/cm³) ≥	2.90
Flexural strength 110 °C×24 h (MPa) ≥	8
Flexural strength 1100 °C×3 h (MPa) ≥	9
Flexural strength 1500 °C×3 h (MPa) ≥	12
Compressive strength 110 °C×24 h (MPa) ≥	80
Compressive strength 1100 °C×3 h (MPa) ≥	90
Compressive strength 1500 °C×3 h (MPa) ≥	120
Linear change after firing 1100 °C×3 h (%)	±0.3
Reference water for installation (%)	5–6

Shaped bricks

Silicon mullite red brick

SiC-bearing mullite brick combining wear resistance with high hot strength — the workhorse lining for transition zones of rotary lime kilns.

Model	RTSA-1650	RTSA-1680	RTSA-1680T
Al2O3 (%) ≥	65	67	70
Refractoriness (°C) ≥	1790	1800	1800
0.2 MPa load softening point (°C) ≥	1650	1680	1690
Compressive strength at room temperature (MPa) ≥	95	90	90
Bulk density (g/cm³) ≥	2.65	2.68	2.70
Wear resistance (cc) ≤	5	5	5
Thermal shock stability (1100 °C water cooling, times) ≥	12	12	15
Thermal conductivity W/(m·K)	2.5	2.3	2.3

Castables

New low-expansion kiln mouth castable

Low-expansion Al2O3–SiC castable for kiln mouths and nose rings, minimising crack formation through repeated heating cycles.

Model	RTSA-75MK
Maximum service temperature (°C)	1780
Al2O3 + SiC (%) ≥	75
Al2O3 + SiO2 (%) ≥	80
Bulk density 110 °C×24 h (g/cm³) ≥	2.70
Flexural strength 110 °C×24 h (MPa) ≥	6
Flexural strength 1100 °C×3 h (MPa) ≥	7
Flexural strength 1500 °C×3 h (MPa)	> 12
Compressive strength 110 °C×24 h (MPa) ≥	110
Compressive strength 1100 °C×3 h (MPa) ≥	120
Linear change after firing 1100 °C×3 h (%)	-0.1 to -0.5
Reference water for installation (%)	5–6

Shaped bricks

Anti-stripping high alumina brick

Alkali- and spalling-resistant high alumina brick for the kiln tail preheating zone, with a proven service life of over two years.

Model	RTSA-KBL70
Al2O3 (%) ≥	70
Bulk density (g/cm³) ≥	2.50
Apparent porosity (%) ≤	23
0.2 MPa load softening start temperature (°C) ≥	1500
Compressive strength at room temperature (MPa) ≥	60
Thermal shock stability (1100 °C water cooling, times) ≥	5
Service life	Kiln tail preheating zone: over 2 years

$Special refractory castable for coal injection pipe$

Castables

Special refractory castable for coal injection pipe

Prefab-grade castable for burner and coal injection pipes, resisting flame impingement and thermal shock up to 1780 °C.

Model	RTSA-75MP
Maximum service temperature (°C)	1780
Al2O3 (%) ≥	75
Al2O3 + SiO2 (%) ≥	80
Bulk density 110 °C×24 h (g/cm³) ≥	2.70
Flexural strength 110 °C×24 h (MPa) ≥	7
Flexural strength 1100 °C×3 h (MPa) ≥	7
Flexural strength 1500 °C×3 h (MPa)	> 12
Compressive strength 110 °C×24 h (MPa) ≥	110
Compressive strength 1100 °C×3 h (MPa) ≥	120
Linear change after firing 1100 °C×3 h (%)	±0.3

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