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[June 2003]
Chinese Development in Corundum Based Block for I&S Industry
'China's Refractories' has reported that a micropored corundum based block for blast furnace (BF) ceramic cups - developed jointly by Gongyi No 5 Refractories Head Factory and the Technical Center and Ironmaking Plant of Wuhan Iron & Steel Co - passed an appraisal of scientific achievement organised by the Science & Technology Bureau of Henan Province. The appraisal committee consisted of nine experts, professors and officials from the refractories and the iron and steel industries.
The block is composed of corundum as the main starting material, resin as a binder plus multi-additives - and is processed by a special technique. From the technological point of view, three technical difficulties have been tackled, i.e. alkali resistance, corrosion resistance to furnace slag, and the formation of micropores.
Experts reportedly deemed that comprehensive properties of the brick had reached those of the product for the same application imported from abroad, and that the alkali resistance and slag-corrosion resistance had surpassed those of imported products.
The product has been used in zones such as the BF bottom and hearth at Hangzhou Iron & Steel Co and has won the bid for the overall repair project of the No 6 BF - at 3,200 square metres - at Wugang. This latter is said to have laid a good foundation for prolonging the service life of the Wugang BF and even for large and mid-sized blast furnaces in domestic ironmaking plants.
The product is said to be suitable for use as assembled sets in ceramic cup, slag and iron tapping holes to meet the requirements of 10 to 15 years' campaign life of blast furnaces. The price of the product is much lower than that of imported ones. It is predicted that the micropored corundum based brick will be widely adopted in the Chinese market.
ENDS