Chrome Zirconium Corundum Series Bricks

Chrome zirconium corundum brick is a composite refractory product. It is a new generation of glass kiln products made of fused dense corundum as the main raw material, industrial chromium oxide green, fused zirconium oxide, sand and binder. After mixing in a certain proportion, it is pressed and sintered at high temperature. This brick has the characteristics of high load softness, high strength, low apparent porosity and good corrosion and erosion resistance. It has a wide range of applications and is suitable for various high-temperature industrial environments, such as steel, non-ferrous metals, glass, ceramics and other industries, and is used for equipment parts that withstand high temperature and corrosive environments. Its use improves the durability and safety of equipment, reduces the frequency of maintenance and replacement, and thus improves production efficiency and economic benefits.

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Description

Chrome-zirconium corundum products have good resistance to glass liquid erosion and can be used in the flue of glass fiber kilns, glass wool, rock wool, green glass melting furnaces

Pool walls, pool bottoms, channels, and checker bricks on the top of various glass kiln regenerators.

Chrome corundum bricks

Chrome-zirconium corundum series bricks are corundum refractory products containing Cr2O3. At high temperatures, Cr2O3 and Al2O3 form a continuous solid solution, so the high-temperature performance of chrome corundum products is better than that of pure corundum products. Chrome corundum bricks used in petrochemical gasification furnaces should be low in silicon, low in iron, low in alkali, high in purity, and have high density and strength. The Cr2O3 content of chrome corundum products, which are widely used, is mostly in the range of 9%~15%.

Performance Chrome-zirconium corundum series bricks have good high temperature resistance and slag corrosion resistance, especially better resistance to molten coal slag corrosion than low-silicon corundum bricks. Its slag corrosion resistance increases with the increase of Cr2O3 content. The physical and chemical properties of chrome corundum bricks (examples) are as follows: Al2O389.62%, Cr2O39.07%, SiO20.17%, FezO30.08%, K2O+Na2O 0.33%, bulk density 3.29g/cm3, apparent porosity 18%, room temperature compressive strength 88.8MPa, reburning line change (1600℃, 3h) -0.07%, load softening temperature greater than 1700℃.

Manufacturing process Chrome zirconium corundum series bricks use high-purity industrial alumina powder and high-purity chromium oxide as raw materials, accurately weigh and mix according to the designed proportion, fully finely mix and add a certain amount of binder, mix and knead evenly, and then press into rough pieces. After the rough pieces are dried, they are electrofused or calcined to make chrome corundum. Chrome corundum is crushed and sieved, and part of it is ground into fine powder. The granular material and fine powder are mixed according to the best grading, a certain amount of binder is added, and after being fully mixed, they are formed by a friction brick press or a hydraulic brick press. After the green body is dried, it is fired at 1800℃.

products/Index	Unit %	Chromic-alumina-zircon-blocks
		HX-CAZ-60	HX-CAZ-30	HX-CAZ-15	HX-CAZ-10
Cr₂O₃≥	%	60	30	15	10
ZrO₂≥	%	12	4	4	2
Al₂O₃≥	%	15	60	75	84
Apparent porosity≤	%	18	18	17	17
Bulk density≥	g/cm³	3.7	3.4	3.35	3.3
Cold crushing strength≥	Mpa	100	100	100	100
0.2Mpa Refractoriness under load≥	℃	1700	1700	1700	1700

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

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