Influence of Aluminum Coating Technology on Industrial Waste Management

Author Name(s): Lenar N. Shafigullin, Alsu A. Yusupova, Galina A. Medvedeva
Author Email: misharin_82@mail.ru

Abstract

The work is devoted to the urgent issues of processing of sulfur-containing and ash-and-slag waste of industrial enterprises. The process flow scheme for obtaining of protective coatings on cement concrete, by impregnation in sulfur melt with high strength, performance properties, and resistance to aggressive environments, was developed. The technological parameters of the process were determined. The addition of ash and slag to the cement concrete allows not only to utilize the waste of heat power industry, but also to increase the strength of the material. Moreover, the applied technology of impregnation provides low thermal conductivity of concrete, and good thermalinsulation characteristics of the material. The increase in strength of samples, containing ash and slag waste, is due to the high dispersion and active surface of ash and slag. The influence of aluminum chloride, an electrophilic agent, on the properties of sulfur binder, was considered. It was shown, that the introduction of aluminum chloride contributed to a more effective protective coating, which provided the samples of cement concrete with high strength, density, and water resistance. The use of an electrophilic agent made it possible to intensify the process of obtaining of inorganic sulfides and composite materials, based on them. It was found, that the application of an electrophilic additive – aluminum chloride – significantly reduced the viscosity of sulfur melt, that was due to the formation of short-chain sulfur radicals. Such a sulfur melt has a fairly high penetrating ability, that provides the formation of a high-quality protective coating.

Introduction

An important area of scientific and technological development is the creation and implementation of new technologies and materials, which ensure the resource saving and meet the environmental requirements. In this regard, the problems of processing and utilization of industrial waste and by-products are of particular importance. In the last decade, in Russia, it is observed the increase in production of industrial sulfur as a by-product in the processing and refining of oil, natural and flue gases [1]. Ash and slag wastes appeared as a result of the work of thermal power plants. They occupy large areas and are a source of pollution of air and water basins [2]. The issue of processing of sulfur-containing and ash-and-slag wastes of industrial enterprises remains unresolved. Ash and slag mixtures are widely used as aggregates and fillers in concrete for various purposes [3-5]. This is determined by the grain and chemical composition, as well as the physical and mechanical characteristics. The most promising is the use of sulfur as a binder, impregnating composition and as an additive in asphalt concrete. The use of sulfur as a raw material for the production of sulfides relates to the methods for improving the operational properties and increasing the products life. It is known the methods of impregnation of wood, ceramic bricks, concrete structures in a sulfur melt. Sulfur impregnation is used for the products with a capillary-porous structure. However, in the literature there is no information about the impregnation of silicate materials in sulfuric melts, using various modifying reagents, as well as about the properties of the resulting coatings.

Conclusion

It is shown, that the introduction of aluminum chloride contributes to the obtaining of a more effective protective coating, which provides the samples of cement concrete with high strength, density, water resistance, and resistance to aggressive environments. The use of electrophilic agent allows to intensify the process of obtaining of inorganic sulfides and composite materials, based on them

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