Refractory concretes with additives of fine-milled high-alumina industrial wastes

The paper is discussing the results of the study of alumina binder and refractory concrete with additives of fine-milled high-alumina industrial wastes. The siftings of the catalyst support of dehydrogenation of hydrocarbons and ferrochromic aluminothermal slag by Kliuchevskoi Ferroalloys Corp. were used as additives. Selecting ferrochromic slag as additive is based on the fact that its content of alumina and phase composition is the closest to the alumina (CAC) and high-alumina cement (HAC). The siftings of the catalyst support of dehydrogenation of hydrocarbons consist of alumina in the active form. These additives provide increased refractoriness of cement. The information on the composition of additives is given. Superplasticizers, based on PCE, were introduced into the binder to compensate the reduction of strength. As PCE additives were used Melflux 1641F, Melflux 2641F, Melflux 2651F and Glenium 51 by BASF Contraction Polymers. The effect of additives on hydration is shown. It is established that the superplasticizers take a retarding effect on the concrete setting process. The optimal quantities of high-alumina additives and superplasticizers have been identified. The basic properties of obtained binders and concrete were investigated. The temperature of application of the developed concrete is 1,400-1,600 degrees C.