Improvement of periclase-carbon torcrete-mix slag resistance 1
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Vol. 53, No. 5, January, 2013
IMPROVEMENT OF PERICLASE-CARBON TORCRETE-MIX SLAG RESISTANCE1 V. G. Kutalov,2 V. A. Perepelitsyn,2 O. Yu. Sheshukov,3 V. S. Gulyakov,3 A. S. Vusikhis,3 D. V. Kuznetsov,4 and M. A. Kostitsyn4 Translated from Novye Ogneupory, No. 10, pp. 36 – 39, October, 2012.
Original article submitted May 5, 2012. Results are provided for an experimental study of an improvement in periclase-carbon torcrete-mix slag resistance by a reduction in molten slag corrosiveness and modification of refractory composite microstructure. Combination of the refractory microstructure modification obtained and slag with changed chemical composition makes it possible to improve torcrete-mix properties considerably and increase its corrosion slag resistance. Keywords: torcrete-mix, periclase, carbon, reducing reactions, slag resistance, carbon nanomaterial, vortex layer equipment.
Recently the problem of providing high quality raw material for the refractory industry in Russia has become more acute. Many years of experience of the activity of the Eastern Institute of Refractories has shown that one way of emerging from the raw material crisis is use of technogenic resources. Leading research institutes in the time of the Soviet Union (VIO, UNIIO, VOSTIO) carried out a series of works devoted to studying torcreting of heating units. It was revealed that the main refractory component of a torcrete mix should be material close in chemical composition to the lining being torcreted. OOO NPO Vostio-Ural has been concerned for more than ten years with development and manufacture of unmolded refractory materials based technogenic raw material, including torcrete-mix of different composition no worse in service properties than analogs of overseas producers. Recent work of the firm is a torcrete-mix of periclase-carbon composition, intended for restoring the most worn areas of steel smelting units. Substance and grain size composition of the mix have been developed taking account of intensification of sintering, molding, and develop1 2 3 4
ment of this material ceramic structure during operation over a wide temperature range. Work has been carried out with the aim of improving corrosive wear resistance of a magnesia-carbon torcrete-mix using innovative technology, in particular modification of a refractory mix with carbon nanomaterials with treatment in vortex layer equipment (VLE). Under the action of VLE alternating electromagnetic field ferromagnetic working bodies are placed in rapid eddy movement, providing uniform charge component distribution throughout the whole material volume. As is well known from practice, an increase in lining life is achieved by a combination of two groups of production measures: creation of optimum highly stable refractories and a reduction in corrosive activity of corrosion agents during operation of metallurgical units. Research has been carried out in these two areas. REDUCTION IN CORROSIVENESS OF CORROSION AGENTS BY CHANGING SLAG CHEMICAL COMPOSITION WITH INTRODUCTION OF ADJUSTMENT ADDITIO
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