Physicochemical Basis of Sulfide Technology of Iron Polysilicate

Author Name(s): Lenar N. Shafigullin, Linara R. Baraeva, Alsu A. Yusupova, Alexander A. Bobryshev, Vladimir T. Erofeev
Author Email: misharin_82@mail.ru

Abstract

The physicochemical basis of iron polysilicate sulfide technology is considered. Using a variety of physicochemical studies, the system of “amorphous silicon dioxide – iron chloride” was studied, not only the interaction between the components in this system with the formation of iron polysilicate was proved, but also the activating effect of the modifier on the filler. In the study of the “iron chloride – sulfur” system, the interaction of the components and the activating effect of the Lewis acid were also proved. Using the Priroda 6 quantumchemical program, the spatial structure of the interaction product was simulated in the ternary system “amorphous silicon dioxide – iron chloride – sulfur” – iron polysilicate sulfide, its stability, and strength were substantiated. Based on the results, the technology of sulfide materials is proposed. The optimal composition of the sulfide material and the optimal synthesis mode were selected. Samples of optimal composition were tested for frost resistance and resistance to aggressive environments (frost resistance of 170-180 cycles, a coefficient of stability in alkalis of 0.96-0.98%, strength 70 MPa, water absorption of 5%). The high physical and mechanical properties of the materials obtained are due to the chemical interaction of the components. Reducing the cost of synthesized sulfide materials based on silica-containing rocks of the Dobrinsk deposit and the waste of iron chloride compared to the analog – silicate concrete grade M350 amounted to 25.4% or 2611.8 rubles. for 1m3.

Introduction

Elemental sulfur is one of the important and large-capacity types of chemical raw materials. The main consumer of sulfur is the chemical industry. About half of the sulfur mined in the world goes to the production of sulfuric acid, whose role in the chemical industry is great. 10-15% of sulfur is used to control pests of crops, about 10% is used by the rubber industry to vulcanize rubber, as well as in the production of matches, medicines, etc. About 15% of the sulfur is sent to obtain sulfides, which are widely used in the national economy. Sulfides are the feedstock for the production of metals, as well as sulfuric acid and sulfates (FeS2). Despite such widespread use of sulfur and its compounds, there is a steady overproduction and there is an acute question of the utilization of sulfur in the oil and gas complex [1-4]. One of the directions of expanding the application of sulfur in the production of sulfides and sulfide materials, which have several advantages, including a quick set of strength, the ability to cure at low temperatures and in the aquatic environment, the property of reuse when heated, low cost. In addition, sulfide-based materials have water resistance, weather and frost resistance, chemical resistance, low heat, and electrical conductivity and, with the appropriate feasibility study, can be used in various structures and structures.

Conclusion

The development of the production of sulfide materials solves not only technical, economic but also environmental problems. The cost of the materials obtained is lower than based on a cement binder, and many physical and mechanical characteristics are much higher. Based on the results of the studies, it can be concluded that the issues of integrated large-scale development of technology for the processing of industrial waste and the production of durable, chemically resistant materials will always remain relevant and in demand in the near and long term in solving both environmental and technical problems.

 

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