The results of experimental studies of compositions of heat-resistant concretes used in metallurgical enterprises, in particular, in the production of steel, are presented. Special attention is paid to improving the construction and technical properties of compositions based on man-made products. The article shows that heat-resistant concretes are already used in many thermal units and building structures in metallurgical production: collectors and dust chambers of sintering machines, blast furnaces, cast iron buckets, slag buckets, converters, steel ladles, intermediate ladle continuous casting machines, large boiler installations of thermal power plants, coke batteries and so on. The problem of optimizing the compositions of heat-resistant concretes is being solved, which will positively affect the environmental and economic components of a full-cycle metallurgical enterprise. The results of the determination of the chemical composition in the studied samples were obtained: scrap lining furnaces and furnace equipment for the production of quicklime, chamotte and slag by X-ray fluorescence spectral and gravimetric methods. The samples were tested at high temperatures above 1300 ℃ in a cryptol furnace with an internal diameter of 60 mm. The rate of temperature rise in the range from 1000 to 1500 ℃ was assumed to be 15 ℃ per minute, and above 1500 ℃–5 ℃ per minute. Waste from metallurgical production with high fire resistance was used to develop compositions of heat-resistant concretes. Moreover, these materials were introduced into the composition both in pure form and in a mixture with each other. The choice of fillers was also made based on fire resistance and compatibility with other components. Large and small aggregates from scrap lining of steel ladles were most often used.