Abstract
AbstractIndustrial rejects are considered secondary resources for several applications involving recovery of mineral values, preparation of low-cost precursors for onward processing as well as raw materials for product development. The scope of utilization of industrial rejects broadly considers material detoxification, process efficiency, overall economics, energy use, impact on environment and the extent of byproduct generation. Aluminium, steel, power and biomass-based industries seemingly generate solid rejects at various stages of production process and remained unusable leftover material. In recent past, selectivity of material input based on synergistic utilization of industrial rejects of different origin has been found useful for converting rejects in to quality product. Choice of making mix designs based on chemical and mineralogical balance among the reject material enabled reduced consumption of commercial ingredients. Also, the choice of selectivity in raw material input provide flexible control in the regulation of physical properties of geo-polymer products such as crushing strength, surface finish, porosity, water absorption, efflorescence and leaching properties. Products of hard, light-weight and multi layered type comprising single, double and tertiary component mix design used for developing geo-polymer based products which are useful for interior and exterior construction needs such as flooring, walling, decoration, paving etc. It is observed, geo-polymer made from the combination of alumino-siliceous industry rejects are a cleaner source of raw material input for low-carbon infrastructure generation which holds ample scope for consuming large volume of underutilized industrial leftover.KeywordsIndustrial rejectsMaterial synergyGeo-polymerizationLow-carbon infrastructureProduct development
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