Refractory Materials for Glass Kiln

Refractory materials of sillimanite, andalusite and mullite have good high temperature thermal stability, resistance to erosion and scouring of glass liquid, and little pollution to glass liquid. They are the most commonly used refractory materials in thermal equipment such as feeders, pipe drawing machines, and regenerators in the glass industry at home and abroad, which can significantly improve productivity. Products include material channel bricks, flow troughs, rotating tubes, material basins, material bowls, stirring paddles, punches, barrels, fire and slag bricks, gate bricks, front arch bricks, rear arch bricks, material basin covers, port bricks, burner bricks, beams, cover bricks, muffle furnace bricks and other varieties and specifications. Andalusite bricks, re-sintered fused mullite and corundum mullite products also have the characteristics of low high temperature creep rate and better physical and chemical properties. They can be used in the upper structure of glass kilns such as borosilicate glass and glass fiber and in the regenerators of various glass kilns.

Send Inquiry

Description

Sillimanite, andalusite, and mullite refractories have the property of kyanite minerals to expand slightly when heated, which can improve the creep resistance and thermal shock resistance of the material. In terms of thermal expansion performance, sillimanite, andalusite, and mullite will turn into mullite when heated to a certain temperature.

Sillimanite, andalusite, and mullite refractories, the temperature at which kyanite begins to transform into mullite is 1200~1500℃, and the volume expansion rate is 16%~18%; the temperature at which andalusite transforms is 1350~1450℃, and the volume expansion rate is about 5%; the temperature at which sillimanite transforms is 1500~1650℃, and the volume expansion rate is 5%~8%. In terms of transformation temperature, kyanite has the lowest temperature, followed by andalusite, and sillimanite has the highest temperature. In terms of expansion, kyanite has the largest temperature, sillimanite is in the middle, and andalusite has the lowest temperature. High-purity kyanite, andalusite, and sillimanite can be used to smelt aluminum-silicon alloys to manufacture aircraft and ships, or to manufacture spark plugs, thermocouple sleeves, stacks and other ceramic parts.

Of course, kyanite family minerals are also used to manufacture refractory materials. When using kyanite family minerals, it is necessary to give full play to the specialties of kyanite, andalusite and sillimanite raw materials as much as possible according to the needs of refractory process.

Products Description

1. Since kyanite has a large expansion, a smaller dosage can compensate for the high-temperature shrinkage of refractory materials. Since kyanite has a low transformation temperature, it is suitable for refractory materials that shrink at lower temperatures. Therefore, kyanite is suitable as an additive for low-grade refractory materials such as sillimanite, andalusite, and mullite.

2. Andalusite has a low expansion caused by heat, and the dosage is less restricted. However, a larger dosage is required to compensate for the same shrinkage. As the dosage of andalusite increases, the anti-deformation and thermal shock resistance of refractory materials will be greatly improved. However, the manufacturing cost also increases significantly. Therefore, andalusite is suitable for high-grade refractory materials such as sillimanite, andalusite, and mullite.

3. Sillimanite has a high transformation temperature, and it is difficult to compensate for the shrinkage of refractory materials at lower temperatures. Therefore, sillimanite is suitable for refractory materials sintered at higher temperatures. For example, sintered refractory materials for glass kilns are manufactured by slurry casting, using synthetic mullite as coarse aggregate, natural sillimanite as fine aggregate, and ground sillimanite, high-alumina clay and kaolin as the matrix.

Produts/Index	Unit	Casting sillimanite		Casting corundum- mulite		Sillimanite		Sintered mulite				Fused mulite	Sintered corundum mulite		andalusite
		CS65	CS60	CCM85	CCM80	S65	S60	SM65	SM70	SM75	SM80	FM75	SCM85	SCM80	A60	A76
Al₂O₃ ≥	%	65	60	85	80	65	60	64	68	74	78	73	85	80	60	76
Fe₂O₃ ≤	%	0.8	0.8	0.5	0.5	0.8	1.0	1.2	1.2	0.8	0.6	0.3	0.3	0.3	0.9	0.7
Apparent porosity ≤	%	22	24	21	22	18	18	18	18	17	17	16	17	17	16	16
Bulk density	g/cm³	2.35 -2.6	2.25-2.5	2.75 -3.0	2.7 -2.9	2.5	2.4	2.45	2.50	2.60	2.75	2.65	2.9	2.80	2.52	2.76
Cold cushing strength	MPa	60	50	80	75	80	70	65	70	80	90	90	90	90	80	100
Refractoriness under load (0.2Mpa)	℃	1580	1520	1680	1650	1650	1600	1580	1600	1650	1700	1700	1700	1700	1650	1700
Thermal shock resisance(1100℃ water cooling)≥	cycles	15	15	20	20	15	15	15	15	15	15	15	20	20	20	20

Note: The indicators in the table are typical values of standard bricks.

Hot Tags: refractory materials for glass kiln, China refractory materials for glass kiln manufacturers, suppliers, factory, Refractory Materials for Glass Kiln, Sintered Mullite Bricks