Latest Developments in Carbon Block for Blast Furnace
The Key State Laboratory Breeding Base of Refractories and Ceramics, Wuhan University of Science and Technology, Wuhan 430081/China
Revision 21.04.2013, 30.06.2013
Volume 5, Issue 4, Pages 109 - 114
Abstract
High thermal conductivity (TC), excellent micropore structure (MS) and molten iron erosion resistance (MIE) are required for high-performance carbon block to achieve the longer service life of blast furnace (BF). Firstly, the micropore structure and properties of carbon block could be improved by optimization of processing parameters. For example, the MS can be further optimized by the addition of microsilica besides incorporating Si powder and reactive alumina. Also, directly adding carbon nanotubes as an additive or in situ forming phases, e.g. finer SiC whiskers, Al4C3 and AlN phases is an alternative approach to improve the TC of carbon block. Meanwhile, MIE resistance combining with optimized micro-porous structure and higher thermal conductivity can be improved by the decomposition of zircon micropowders in the matrix of carbon block at high temperature. Secondly, ceramic-bonded carbon (CBC) technique could be used to prepare high performance carbon block. In this paper, the latest developments in carbon block for BF are summarized.
Keywords
carbon block, micropore structure, thermal conductivity, molten iron erosion, ceramic-bonded carbon technique
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