Sintering of sepiolite-rich by-products for the manufacture of lightweight aggregates: technological properties, thermal behavior and mineralogical changes

IF 1.1 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
José Manuel Moreno-Maroto, B. González-Corrochano, J. Alonso-Azcárate, C. Martínez-García
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引用次数: 2

Abstract

A sepiolite mining by-product (SEP) has been studied as major component for lightweight aggregate (LWA) manufacture. Pellet bursting during firing was avoided by the addition of 2.5 wt% of thermoplastic waste (P) and 2.5 wt% P + 2.5 wt% carbon fiber residue (FC) in powder form. The mixtures were pelletized and then sintered at 1225o˚C for 4 minutes in a rotary kiln. Highly porous white LWAs with good mechanical strength were produced. A mineralogical study revealed the formation of amorphous phase ( > 50%) and minor proportions of enstatite, protoenstatite and diopside. Quartz was the only inherited mineral, appearing in the form of isolated phenocrysts within a general porphyritic texture. The result of this study suggests the promising use of sepiolite (whether or not in residue form) for the manufacture of high quality LWAs.
烧结富含海泡石的副产品生产轻质骨料:技术性能、热行为和矿物学变化
对海泡石开采副产物(SEP)作为生产轻骨料的主要原料进行了研究。通过添加2.5 wt%的热塑性废渣(P)和2.5 wt%的P + 2.5 wt%的碳纤维渣(FC)以粉末形式避免了球团在烧制过程中爆裂。将混合物制成球团,然后在12250℃的回转窑中烧结4min。制备了具有良好机械强度的高孔白色LWAs。矿物学研究表明,该矿床形成无定形相(bbb50 %)和少量顽辉石、原顽辉石和透辉石。石英是唯一的遗传矿物,以孤立斑晶的形式出现在一般的斑岩结构中。本研究结果表明,海泡石(无论是否以残留物形式)在制造高质量LWAs方面具有广阔的应用前景。
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来源期刊
Materiales de Construccion
Materiales de Construccion 工程技术-材料科学:综合
CiteScore
3.20
自引率
9.50%
发文量
38
审稿时长
>12 weeks
期刊介绍: Materiales de Construcción is a quarterly, scientific Journal published in English, intended for researchers, plant technicians and other professionals engaged in the area of Construction, Materials Science and Technology. Scientific articles focus mainly on: - Physics and chemistry of the formation of cement and other binders. - Cement and concrete. Components (aggregate, admixtures, additions and similar). Behaviour and properties. - Durability and corrosion of other construction materials. - Restoration and conservation of the materials in heritage monuments. - Weathering and the deterioration of construction materials. - Use of industrial waste and by-products in construction. - Manufacture and properties of other construction materials, such as: gypsum/plaster, lime%2
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