The article presents the results of the development of aluminous and barium-containing cements with the use of worn out cobalt-containing catalyst for the hydrogenation of organic compounds of PJSC “Severodonetsk Azot Association” as similar an aluminum-containing component. The chemical and phase compositions of the test compositions are presented. The physical and mechanical properties and design melting points of cobalt-containing cements are determined. Based on the of the conducted researches it is established the possibility of obtaining refractory high-strength cements for resource-saving technology using worn out cobalt-containing catalysts of hydrogenation processes.

The basis of modern materials science is multicomponent systems, on their basis it is possible to create various combinations of phases in structural materials with a set of specified properties. The investigated system MgO-Al2O3-FeO-TiO2 is promising for the production of periclase-spinel refractories used as lining of rotary kilns during cement clinker firing, which are highly resistant to chemical corrosion when exposed to a gas environment and cement clinker components; thermomechanical stresses. However, in the reference literature and scientific articles, no information was found on the structure of the four-component diagram of the state of the MgO-Al2O3-FeO-TiO2 system, partial elements of its structure are given only in the composition of multicomponent systems [1-3]. Thus, research to the study of the subsolidus structure of the MgO-Al2O3-FeO-TiO2 system, which is the physicochemical basis for the development of compositions of periclase-spinel refractories, is urgent.

Inorganic chemistryInorganic chemistry Z 0100 Structure of the BaO-Al 2 O 3 -SiO 2 System (A Review) -[26 refs.]. -(SHABANOVA, G. N.; TARANENKOVA, V. V.; KOROGODSKAYA, A. N.; KHRISTICH, E. V.; Glass Ceram. 60 (2003) 1-2, 43-46; Polytech. Inst., Natl. Tech. Univ., Kharkov, Ukraine; Eng.) -Schramke 47-238

Abstract. One of the most important problems related to the development of new nonmetal materials and their performance characteristics is to predict the phase composition. The most comprehensive information on phase interactions and the thermodynamic stability of phase combinations is given by the state diagrams. The materials synthesized in the system subsolidus domain can be predicted the most accurately, because their sintering occurs without participation of the melt. Due to the above fact, the studies of the subsolidus structure of BaO -CoO -Fe 2 O 3 -Al 2 O 3 system are of great interest, because on the basis of this system we can obtain a huge amount of nonmetal materials with prescribed properties, for example ferrimagnetic materials to protect from electromagnetic radiation, because the system compounds have cementing, refractory and ferrimagnetic properties. To study the structure of BaO -CoO -Fe 2 O 3 -Al 2 O 3 system in detail the authors summed up already known data on the thermodynamic constants of system compounds. This allowed us to do the thermodynamic analysis of multiphase equilibrium processes that occur in the subsolidus of BaO -CoO -Fe 2 O 3 -Al 2 O 3 system that was used as a basis for the plotting of the state diagram for the subsolidus domain of the system. A promising field for the application of obtained data is the cement production technology. The produced cement can be used independently and as a binding material to produce special cements and materials that retain their properties when exposed to the action of high-frequency electromagnetic radiation.

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