Papers by Keyword: Ternary Compounds

Abstract: Pelletising, i.e. transformation of fine dusty materials into lump materials (pellets, briquettes, pellets), is an important technical task solved in many sectors of the national economy - ferrous and non-ferrous metallurgy, chemical industry and in a number of other industries. The process of pelletising ores and ore concentrates is of the greatest importance for the production of iron and steel, i.e. for ferrous metallurgy. The most common method of pelletising is pelletising - granulation of iron ore concentrates in special granulation plants, usually with the use of binders. As a result of pelletising, so-called pellets are produced, which are subjected to hardening firing (roasting pellets) or achieve the required level of properties without high-temperature treatment (non-roasting pellets) through the use of special binders. The current trend is the transition from firing methods of pellet hardening to non-firing (low-temperature) methods.

Abstract: In this article in order to verify the probability of the formation of the compound CaBaAl₄O₈, a thermodynamic analysis of the following possible solid-phase reactions of its formation was carried out: formation of CaBaAl₄O₈ from the initial components - calcium carbon dioxide, barium carbon dioxide and aluminum oxide; the probability of formation of dual compounds CaAl₂O₄ and BaAl₂O₄ from the same raw materials (since the compound CaBaAl₄O₈ is located on the BaAl₂O₄-CaAl₂O₄ conjugate) and the possibility of formation of the compound CaBaAl₄O₈ from binary compounds CaAl₂O₄ and BaAl₂O₄. As a result of our experimental studies, the existence of ternary compounds Вa₃CaAl₂O₇ and ВaCa₂Al₈O₁₅ was confirmed, and it was found that the Вa₃CaAl₂O₇ compound exists in the system at least up to a temperature of 1400 °C. Thus, our studies have determined an increase in the temperature limits of its existence, in contrast to the data of previous researchers, who indicated 1250 °C as the upper temperature of existence of Вa₃CaAl₂O₇.

Abstract: In this work, the partial isothermal section of the Al-Ca-Zn system in the region between 33.3 and 100 at.% Ca has been investigated at 350°C using key alloys. The actual composition of the alloys is measured by inductively coupled plasma technique. Phase relations and solubility limits of the binary and ternary compounds have been determined by means of electron probe microanalysis and X-ray diffraction. In the current work, a new ternary compound has been identified in this region with the Al₉Ca₃₁Zn₁₀ (IM1) composition. Binary compound Al₁₄Ca₁₃ (IM2) has an extended solid solubility into the ternary system. The homogeneity ranges of the Al₂Ca, the MgNi₂-type C36 phase Al_2-xCaZn_x (0.28≤x≤0.70) (IM3) at 350°C and CaZn₂ compounds in the pseudobinary Al₂Ca-CaZn₂ section have been determined at 350°C and the results are combined with the literature to construct the partial vertical Al₂Ca-CaZn₂ section and partial isothermal Al-Ca-Zn section at 350°C.

Abstract: Ceramic compound with the formula BaLi2Ti6O14 was prepared by sol-gel method at basic conditions, using ammonium hydroxide as hydrolysis catalyst. Some portions of gel sample obtained were heat treated at 200, 400, 600, and 800°C. Samples were characterized by X-ray diffraction (XRD), thermal analysis (DTA-TGA), UV-Vis and FTIR. Crystalline phase was formed when a sample was treated at 800°C for 6h. This material has been previously synthesized by solid state reaction using temperatures as high as 900-1150°C for 2 to 10 days. The crystal structure of BaLi2Ti6O14 is similar to that corresponding strontium containing phase, SrLi2Ti6O14, which has been reported as catalyst for oxidative dehydrogenation of lower alkanes.