Corundum Refractory Production Process

Casting corundum products used in raw materials are mainly industrial alumina and quartz sand. The mixed batch is made from industrial alumina 97% (requires Al2O3 content greater than or equal to 98.5%) and quartz sand 3%, and add a small amount of admixture, in the wheel mill after 30-40min mixture.

In the absence of an admixture, the melting furnace bath temperature to reach 2200-2300 degrees, in which case the melt has a great expansion, after pouring cooling will inevitably produce a large shrinkage, it is difficult to obtain a dense uniform Castings; at the same time because of the low viscosity of alumina melt, crystal capacity is very strong, too late to heat on the solidification, casting will also form a large number of microporous. In order to reduce the shrinkage of the cast brick, it is necessary to add a small amount of extrude material to the batch to reduce the melting temperature and thereby reduce the volume expansion of the melt. Add different materials depending on the product type.

For casting a-Al2O3 bricks, add a small amount of flux, such as the introduction of 0.25% -1% B2O3, not only can accelerate the melting process, but also improve the melt viscosity.

In addition to the mixed batch, into the charge there are recycling waste, such as scrap castings, risers, etc., and foreign clean corundum fragments, but the number can not exceed 30% of the amount of loading.

Introduction of our company

Gongyi Taurus Refractory Material Factory is a professional refractory materials manufacturers and refractory materials suppliers,mainly supply Unshaped Refractories,Silicon Carbide Refractory Castable,Castable Refractory Cement,Pouring Material,Castable Refractory Concrete,Silica Ramming Mass etc. series of refractory materials products, sincerely welcome everyone to visit.

Contact information

Contact: Mr. Niu
Tel: +86-371-64372566
Fax: +86-371-64372588
Whatsapp: +86-15137151612
Mobile Phone: +86-15137151612
Email: info@jnrefractory.com