THE USE OF METALLURGICAL CALCIUM, ALUMINUM AND IRON-CONTAINING SLAGS IN THE PRODUCTION OF HEAT-RESISTANT CONCRETE BASED ON ORTHOPHOSPHORIC ACID

Abstract

The objects of research are: ferropyl from self-disintegrating slags of low-carbon ferrochrome, slag from smelting without carbon ferrochrome, ferrite-calcium slag and heat-resistant concrete. Due to the fact that the Russian budget does not provide funding for geological exploration and other survey work to determine the quantity and quality of raw materials for the production of construction products, it is necessary to conduct research on the use of technogenic raw materials as raw materials. The use of technogenic raw materials in the production of construction materials practically reduces many costs not only for geological exploration, but also for the arrangement, including the operation of quarries, to zero. Metallurgical industries (non-ferrous and ferrous) in Russia emit a third of all available emissions from industrial enterprises into the atmosphere, while the volume of metallurgy products (non-ferrous and ferrous) is only 17 % of the total domestic industry. In this work, metallurgical waste was used for the production of heat-resistant concrete: as a calcium-containing component, ferropyl from self-disintegrating slags of low-carbon ferrochrome, as an iron-containing component, ferrite-calcium slag, waste from the processing of copper-zinc concentrates, which is a light yellow material slowly cooled to complete scattering, resembling fine sand, and as an aluminum-containing slag from smelting without carbon ferrochrome. Studies have shown that ferrite-calcium slag contains ferrous iron oxide (fayalite) reacts quickly with Н2РO4 and heats the mixture to the required temperature for the appearance of astringent properties. Studies have shown that thanks to the use of orthophosphoric acid as a binder, it is possible to dispose of up to 85 % of non-ferrous metallurgy waste and at the same time obtain heat-resistant concretes with high physical and mechanical properties.