Refractories

Refractory bricks, mortars and castables

Bricks, mortars and castables for cement kilns, supplied through our representation of LZR, a producer established in 1979 with capacity of about 200,000 MT per year.

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LZR refractory lining in a rotary cement kiln, with brick grades by zone

We have supplied about 3,000 tonnes of refractory bricks. The grades below cover every kiln zone, from the sintering zone to the preheater and cooler.

Magnesia spinel bricksSilicon-mullite bricksAlkali-resistant bricksMortarsCastables

LZR products by kiln position. Source: LZR product data sheets.

Download LZR data sheets (PDF)

1979LZR established (current corporate structure since 2002)

~200,000 MTAnnual production capacity

40+Countries supplied, according to the producer

Zibo, ChinaShandong Province, China

Bricks by kiln zone

Typical values from LZR product data sheets. Properties are average values and are not guaranteed values.

Grade	Type	Used in	Typical chemistry, %	Bulk density, g/cm³	Porosity, %	CCS, MPa	RUL, °C
Sintering zone
MTL-I	Magnesia-hercynite spinel brick	Sintering zone	MgO 85-88 · Al2O3 4-6	2.9-2.95	17	60	1650
Transition and burning zone
MLJ88	Magnesia-alumina spinel brick	Transition / burning zone	MgO 87-89 · Al2O3 9-11	2.9-3.0	16	65	1700
MLJ85	Magnesia-alumina spinel brick	Transition / burning zone	MgO 85-87 · Al2O3 10-11	2.9-3.0	16	65	1700
MLJ83	Magnesia-alumina spinel brick	Transition zone	MgO 83-85 · Al2O3 10-12	2.9-3.0	17	60	>1700
MLJ85FH	Low thermal conductivity (LTC) magnesia-alumina spinel brick, working layer	Transition zone	MgO 85-87 · Al2O3 10-11	2.9-3.0	17	60	1700
Safety zone, inlet, calcining zone and cooler
GMH-I	Silicon-mullite andalusite brick	Safety zone / inlet zone	Al2O3 60-66 · SiC+SiO2 35	2.65-2.7	20	80-100	1650
GM1650	Silicon-mullite brick	Safety zone, calcining zone, cooler	Al2O3 63-68 · SiC 12-15	2.65-2.7	17-19	90	1650
GM1550	Silicon-mullite brick	Cooler	Al2O3 57-60 · SiC+SiO2 33	2.5-2.55	20	90-95	1560
DDR30	Low thermal conductivity anti-spalling brick	Safety, preheating and calcining zone	Al2O3 32-34 · SiO2 62-64	2.1-2.2	16	57	1320
KBL70	Anti-spalling alumina brick	Calciner, kiln hood, cooler, tertiary air ducts	Al2O3 69-72	2.45-2.55	20-23	68	1450
GM1450FH	Silicon-mullite compound brick (working + insulating layer)	Tertiary air ducts	Al2O3 ≥45 · SiC >6	≥2.30	≤20	≥50	≥1450
Preheater and calciner
RK-A	High-strength alkali-resistant brick	Preheater, calciner, tertiary air ducts	Al2O3 30-40	2.1-2.2	19.5	40	1350
RK-H	High-strength alkali-resistant brick	Preheater, calciner, tertiary air ducts	Al2O3 36	2.1-2.2	19.5	45	1250

CCS: cold crushing strength. RUL: refractoriness under load. MLJ85FH also has an insulating layer (bulk density 2.6-2.7, CCS 35 MPa, RUL 1600 °C) and GM1450FH has an insulating layer (bulk density ≤1.8); see data sheets.

Castables

LZR castables for kiln inlet, hood, cooler, preheater and calciner. All grades are installed by vibration, delivered dry, packed in 50 kg bags with a storage life of 6 months.

Grade	Type	Max service temp., °C	Used in	Al2O3, %	Bulk density, g/cm³	CCS after drying, MPa
LN-90K	Corundum-mullite castable with steel fiber	1550	Kiln eye, outlet	50-55	2.65-2.7	80
LN-90P	Corundum-mullite castable	1550	Burner	50-55	2.60-2.65	80
LN-70SC	Mullite castable	1550	Kiln hood, cooler	60-68	2.60	100
LN-70F	Steel fiber wear-resistant castable	1500	Kiln inlet, kiln hood, cooler	68-73	2.7	100
LN-70	Low cement high strength castable	1500	Kiln inlet, kiln hood, cooler, tertiary air duct, inlet chamber	68-73	2.7	100
LN-60	Low cement high strength castable	1450	Cooler, preheater, kiln hood	60-65	2.65	80
LN-50	Low cement high strength castable	1400	Cooler, preheater, kiln hood	49-54	2.50	80
LN-40SC	SiC anti-crusting castable	1400	Preheater, calciner, inlet chamber	35-40	2.4	70
LN-30	High-strength alkali-resistant castable	1200	Preheater, calciner	33-35	2.2-2.3	50

Where LZR products are used

Rotary cement kilns (sintering, transition, burning and cooling zones), lime kilns, steel ladle linings and other high-temperature industrial processes.

Full technical data sheets for every grade are available on request. Send us your kiln data and operating conditions and we propose the lining.