Improvement of OAO BKO oxide-carbon refractories

Abstract

Properties are provided for oxide-carbon refractories produced by OAO BKO, used for lining various zones of steel-pouring ladles and converters. The dynamics of lining life for a OAO NLMK 350-ton converter, executed with refractories produced by OAO BKO, are demonstrated.The crisis year of 2009 brought changes in metallurgical production. A sharp and repeated fall in the price of ferrous metals and rolled product made steel producers reconsider plans of the development of production in the direction of greater profit. Open-hearth production was finally closed down in OAO Severstal'; the open-hearth workshop was closed in OAO Ashinsk Metallurgical Plant, etc. Contemporary and innovative technology is replacing outdated methods.Even higher specifications are laid down for the refractory objects in lining metallurgical units, which compels OAO BKO refractory workers to steadily improve oxide-carbon refractories, produced currently in contemporary production in China. From 2006 OAO BKO refractories are favorably recommended for lining steel-pouring ladles, converters, furnace-ladle devices for extra-furnace treatment of steel, and other steel smelting production units.The improvement in oxide-carbon refractories is complex in nature and combines several areas simultaneously. Use of the latest achievements in science and technology, the OAO BKO scientific center (technology and production are improved in the center) using contemporary equipment carries out research on the physiochemical and technical property indices for refractories. The research work attracts specialists and refractory technology faculties of institutes of St Petersburg, Belgorod, and Moscow. In production there is use of high quality mixing and pressing equipment from leading world companies.In order to provide production of high quality raw material is use of the resources of Chinese stockholders, having their own plant for melting magnesite, which makes it possible to use in the production of periclase with purity up to 99%. Material filling of the charge and technology for producing oxide-carbon refractories in a joint enterprise is determined by OAO BKO specialists in relation to the service conditions of the consumer. Quality control of refractories is carried out by OAO BKO specialists. Use of contemporary methods for logistical control makes it possible to shorten the time for movement of a load from production to the consumer to three weeks, thereby making it possible to track the location of a load daily.In order to provide uniform life for all lining elements and their uniform wear there is optimization of lining design combined with choice of refractories. As a result of selecting the optimum grades of objects fro different zones of a lining in a steel-pouring ladle, based on continuous monitoring of unit operation and realization of the zonal principle of lining construction, its life entirely satisfies consumer operating, providing the guaranteed commitments of the supplier.The plant produces objects of grades PU-1, PU-6 (Table 1) for ...