Effect of talc and bauxite on sintering, microstructure, and refractory properties of Egyptian dolomitic magnesite

British Ceramic Transactions Pub Date : 2003-12-01 DOI:10.1179/096797803225009391

A. Othman

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引用次数: 15

Abstract

Abstract Refractories produced from mixes of Egyptian dolomitic magnesite with talc and low cost Chinese bauxite have been assessed as potential substitutes for the high temperature basic refractory bricks currently used in steelmaking and other industries. Fifteen batches of different compositions were prepared by firing for 2 h up to 1580° C. Six samples were selected for further investigation on the basis of their phase composition and densification parameters. The mineralogical composition and microstructure, pore size distribution, and mechanical and refractory properties of these samples were investigated. All six samples consisted mainly of MgO and MA spinel refractory phases, plus some calcium silicates and aluminoferrite phases. The latter phases contribute to densification during firing by promoting liquid phase formation. Most samples showed high refractoriness under load, good spalling resistance, better mechanical properties than current refractories, and compact microstructure. It is concluded that these new refractories are good candidate materials for the production of shaped linings for industrial kilns and furnaces.

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滑石和铝土矿对埃及白云质菱镁矿烧结、显微结构和耐火性能的影响

由埃及白云质菱镁矿与滑石和低成本的中国铝土矿混合制成的耐火材料被认为是目前用于炼钢和其他工业的高温碱性耐火砖的潜在替代品。在1580℃高温下焙烧2 h，制备了15批不同成分的样品，根据其相组成和致密化参数选择了6个样品进行进一步研究。研究了试样的矿物组成、微观结构、孔径分布、力学性能和耐火性能。6个样品主要由MgO和MA尖晶石耐火相组成，外加部分硅酸钙和铁素体铝相。后一相通过促进液相的形成，有助于烧结过程中的致密化。大部分试样在载荷作用下耐火度高，抗剥落性好，力学性能优于现有耐火材料，显微组织致密。结果表明，这些新型耐火材料是生产工业窑炉异形衬里的良好候选材料。

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来源期刊

British Ceramic Transactions

CiteScore

0.10

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0.00%

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