ISSN 1995-4301
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ISSN 2618-8406
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Assessment of the composition and the microstructure of aluminiumcontaining waste for the substantiation of the directions of its use

A. A. Martynova, G. M. Batrakova
Section: Ecologization of industry
Complex recycling of industrial wastes involves the extraction of valuable components and the use of waste as secondary material resources. Implementation of resource-saving technologies reduces the anthropogenic load on the environment. In the process of thermal destruction of calorific materials, waste with a high content of aluminum oxide is generated. In order to determine the directions of usage of alumina-containing waste the initial study of its composition and structure was made. The methods of scanning electron microscopy and quantitative physicochemical analysis were used. The following samples were studied: construction samples with waste additives (15 and 30%), and a series of samples purified with mineral acids and water. The mineral composition of the alumina waste corresponded to the requirements for raw materials for use as a reinforcing additive in cement mixtures, heat-resistant concretes and for the manufacture of binders. Compaction of the structure by spherical particles Al2O3 affects the strength characteristics of gypsum binder samples. A comparison is made between the physico-mechanical characteristics of samples with different waste content and control sample of gypsum. A study of the microstructure and element analysis of waste, purified by mineral acids, was made. The analysis showed an inhomogeneous composition of impurities. Treatment of waste with acids and water is effectively remove impurities, at the same time mass content of aluminum in the purified samples is increasing. The results of evaluation of waste structure and composition can be used for explanation of materials formation with new structure on aluminum-oxygen basis and ceramic materials formation that can be manufactured using this type of waste.
Keywords: aluminum-containing wastes, aluminium oxide, sludge, energy-dispersive microanalysis

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Article published in number 2 for 2018
DOI: 10.25750/1995-4301-2018-2-062-069
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