Development of fireclay aluminosilicate refractory from lithomargic clay deposits

Andrews, Anthony P.; Adam, Joseph; Gawu, Simon K. Y.

doi:10.1016/j.ceramint.2012.06.091

Cited by 39 publications

(21 citation statements)

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“…The uses for fireclay refractory brick comprise of porous refractory insulation behind furnace linings, refractory fireclay bricks and ladles [7].Refractories are frequently consumed basically in the iron and steel industries [8]. Contamination of refractories clays are usually with limited amount of impurity as contained in the oxides which are CaO, MgO, TiO 2 , Fe 2 O 3 , Mn, SO 3 , ZnO, Cl, K 2 O, P 2 O 5 , Cr 2 O 3 and alkali oxides that acts as fluxing mediator at very high temperature [9]. In the process ofiron and steel production, the use of basic oxygen furnace (BOF) for the molten iron that comes from the blast furnace is decontaminated from the scums.Refractories belonging to silica-alumina have heterogeneous microstructure with bulky grain size and reasonable rate of porosity [10].…”

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confidence: 99%

Influence of Sintering Temperatures on Physico-Mechanical Properties and Microstructure of Refractory Fireclay Bricks

Amkpa¹,

Badarulzaman²,

Aramjat³

2016

IJET

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Abstract-ThisI. INTRODUCTION The up surge application and request for refractory bricks had motivated this research to investigate the raw clay materials used for production of refractory bricks. The raw clay materials were subjected to standard refractory fireclay brick tests requirement through the tests procedures for chemical, thermal, physical and mechanical properties [1]. Clay as a raw material varied considerably in terms of workability, structure, particle-size distribution, plasticity and mineralogical composition. These differences paved way for clays being categorized or classified into plastic clays, flint clays, kaolin clays, fireclays and ball clays [2]. In the refractory industries, they are grouped and referred to as illite, Montmorillonite and kaolinite [3]. Refractories are clay materials that are generally capable of enduring very high temperatures without deformation, structural changes or softening [4]. The type of refractories is determined by the type of refractory requirement for a specific purpose. The types are classified as acid, basic and neutral refractories [5]. Traditionally these clay materials containAl 2 O 3 .SiO 2 .H 2 O to produce alumino-silicates refractory fireclay bricks. They are further classified by temperature. When the temperature is between 1500-1700 0 C, it is branded as refractory e.g. fireclay.The temperaturebetween 1700-2000 0 Cis recognized as high refractory e.g. chromite. When thetemperature is 2000 0 C, it is referred to as super refractory e.g. zircon [5].The applications of refractories are employed in the construction of furnaceslinings, ladles, reactors, ovens and kiln [6]. This disposition proved that the raw clay material is a fireclay and belongs to the alumino-silicate subgroup. The uses for fireclay refractory brick comprise of porous refractory insulation behind furnace linings, refractory fireclay bricks and ladles [7].Refractories are frequently consumed basically in the iron and steel industries [8]. Contamination of refractories clays are usually with limited amount of impurity as contained in the oxides which are CaO, MgO, TiO 2 , Fe 2 O 3 , Mn, SO 3 , ZnO, Cl, K 2 O, P 2 O 5 , Cr 2 O 3 and alkali oxides that acts as fluxing mediator at very high temperature [9]. In the process ofiron and steel production, the use of basic oxygen furnace (BOF) for the molten iron that comes from the blast furnace is decontaminated from the scums.Refractories belonging to silica-alumina have heterogeneous microstructure with bulky grain size and reasonable rate of porosity [10]. In Nigeria, previous investigation work has been done on the characterization of the native refractory raw clay materials for the making of quality refractory fireclay bricks for furnace lining, ladles, ovens and kilns [11]. In many cases, the outcome and results of such previous work were inconclusive and not comprehensive enough to be used or adopted for industrial uses. They were not subjected to standard test requirement for refractory bricks production.The researches for an alterna...

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Influence of Sintering Temperatures on Physico-Mechanical Properties and Microstructure of Refractory Fireclay Bricks

Amkpa¹,

Badarulzaman²,

Aramjat³

2016

IJET

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“…Finely-ground ceramic powder is a waste material of major scientific interest in the Czech Republic. Its potential for practical use in the building industry has been confirmed by several research studies [14][15][16][17][18][19]. However, its use for substituting aluminous cement is a quite novel approach.…”

Section: Methodsmentioning

confidence: 99%

“…The refractory quality of high-alumina materials is usually higher than that of fireclay-bearing refractories. Nevertheless, fireclay refractories are still the most widely used type, due to their ease of fabrication, their resistance to chemical attack and their relatively low cost [14].…”

Section: Methodsmentioning

confidence: 99%

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Residual Properties of Fiber-Reinforced Refractory Composites With a Fireclay Filler

et al. 2016

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Abstract. The aim of our study was to develop a composite material for industrial use that is resistant to the effect of high temperatures. The binder system based on aluminous cement was modified by adding finely-ground ceramic powder and metakaolin to reduce costs and also to reduce adverse effects on the environment due to high energy consumption for cement production. Additives were applied as a partial aluminous cement replacement in doses of 10, 20 and 30 % by weight. The composites were evaluated on the basis of their mechanical properties and their bulk density after gradual temperature loading. The influence of basalt fibers and modifications to the binder system were studied at the same time. Basalt fibers were applied in doses of 0.5 % and 2.0 % by volume. The results confirmed the potential of the mineral additives studied here for practical applications, taking into account the residual mechanical parameters after thermal loading. The addition of ceramic powder reduced the bulk density by 5 % for each 10 % of cement substitution, but the residual values were very similar. The bulk density and the compressive strength were reduced when basalt fibers were applied, and the flexural strength was significantly increased in proportion to the fiber dosages. Metakaolin seems to be a more suitable additive than the ceramic powder that was applied here, because there was a significant increase in the mechanical parameters and also in the residual values of all properties that were studied.

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“…Lithomargic clay consists mainly of alumina (31.3–45.9%) and silica (27–38.3%). Oxides of iron (Fe 2 O 3 ), potassium (K 2 O, potash), and sodium (Na 2 O, soda) are some of the impurities found in the clay . The mineralogical composition of the clay consists mainly of kaolinite and small fraction of gibbsite .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Lightweight Anorthite Bodies from Lithomargic Clay

Andrews

Amoah

Anaman

et al. 2016

Int J Applied Ceramic Tech

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Lightweight anorthite bricks were fabricated by firing lithomargic clay with varied lime content. Mfensi clay was added as a binder, while sawdust was added to control porosity. The effect of lime on firing shrinkage, bulk density, apparent porosity, water absorption, and compressive strength of the anorthite bricks was investigated. Increasing lime content decreased firing shrinkage from 12% to 2% upon addition of 40 wt% lime. The bulk density and apparent porosity ranged from 0.77 to 0.96 g/cm 3 and 45 to 56%, respectively. Water absorption was between 46 and 73%, while compressive strength was between 0.2 and 1.2 MPa.

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Development of fireclay aluminosilicate refractory from lithomargic clay deposits

Cited by 39 publications

References 1 publication

Influence of Sintering Temperatures on Physico-Mechanical Properties and Microstructure of Refractory Fireclay Bricks

Influence of Sintering Temperatures on Physico-Mechanical Properties and Microstructure of Refractory Fireclay Bricks

Residual Properties of Fiber-Reinforced Refractory Composites With a Fireclay Filler

Fabrication of Lightweight Anorthite Bodies from Lithomargic Clay

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