The invention relates to an energy-saving
slag thermal insulator, and belongs to the technical field of
energy conservation, emission reduction and comprehensive utilization in the
metallurgy industry. The thermal insulator comprises the following main chemical components in percentage by weight: 25 to 70 percent of SiO2, 1 to 25 percent of Al2O3, 1 to 40 percent of CaO, 0 to 20 percent of MgO, 0 to 10 percent of F<->, 0 to 10 percent of R2O (R is a monovalent
metal ion), 0 to 10 percent of Fe2O3, 5 to 60 percent of
fixed carbon with
bulk density of 0.25 to 0.75g / cm<3>. The thermal insulator has high
thermal insulation performance and can reduce the thermal loss of high-temperature
slag; the thermal insulator contains a certain amount of
fixed carbon, so heat generated in the
chemical reaction of the
fixed carbon can be used for further making up the thermal loss of the
slag; meanwhile, the thermal insulator belongs to a
silicon-aluminum material, and part or all of the thermal insulator can be dissolved in the slag finally so as to improve the
chemical composition of the slag and reduce the
melting point of the slag. The thermal insulator has the advantages of simple production process, low cost, and suitability for various processes for utilizing the
sensible heat of the slag, increasing the fluidity of the slag or improving the performance of the slag.