Calcium oxide

About: Calcium oxide is a research topic. Over the lifetime, 7600 publications have been published within this topic receiving 66104 citations. The topic is also known as: caustic lime & quicklime.

Method and apparatus for smelting titanium metal

Abstract: A method for smelting a titanium metal Ti wherein titanium oxide TiO2 is subjected to thermal reduction to produce a titanium metal, characterized in that it comprises charging a mixed salt of calcium chloride CaCl2 and calcium oxide CaO into a reaction vessel, heating the mixed salt to prepare a molten salt as a reaction region, electrolyzing the molten salt to thereby convert the reaction region to a strong reducing molten salt containing an 1-valent calcium ion Ca+ and/or calcium Ca, supplying titanium oxide into the strong reducing molten salt, to reduce the titanium oxide by the 1-valent calcium ion Ca+ and/or calcium Ca and deoxidize the titanium metal having been formed by the reduction of the titanium oxide and an apparatus for practicing the method. The method can be employed for producing a titanium metal suitable for various applications advantageously from a commercial view point.

Alumina-rich refractory concretes with added spinel, periclase and dolomite: A comparative study of their microstructural evolution with temperature

Abstract: Three processing routes for obtaining refractory castables within the alumina-rich zone of the Al 2O3–MgO–CaO ternary phase equilibrium diagram were studied starting from mixtures of: (a) calcined alumina, synthetic spinel and calcium aluminate cements, (b) calcined alumina, magnesia and calcium aluminate cement, and (c) calcined alumina, dolomite and calcium aluminate cement. The evolution of the phases and microstructure was studied as a function of temperature and the processing route for both refractory concretes and their corresponding matrices (<125m). © 2004 Elsevier Ltd. All rights reserved.

Development of supported iron oxide catalyst for destruction of PCDD/F.

Abstract: Studies on the development of supported iron oxide catalysts for PCDD/F decomposition using 2-monochlorophenol as a surrogate test compound are presented. Iron oxide catalysts supported on titania were prepared by two methods: impregnation and the sol−gel method. The latter preparation method resulted in better dispersion of iron oxide on the surface and the formation of γ-Fe2O3. This is in contrast to the impregnated samples where α-Fe2O3 crystallites were formed. Formation of γ-Fe2O3 resulted in improved reducibility of the active phase that favorably affected the catalytic oxidation properties of the catalyst, i.e., the light-off curves for the sol−gel samples were shifted toward lower temperature. Addition of calcium oxide to iron oxide catalyst further improved the performance of the system through stabilization and increase in the concentration of γ-Fe2O3 in the sol−gel prepared samples. Addition of calcium oxide has a dual effect on the performance of the catalyst. First, it creates oxygen vacanci...

Lapping abrasive of aluminazirconia system and method for producing the same

Abstract: Alumina-zirconia lapping abrasives containing at most 30% tetragonal zirconia and optionally containing at least one oxide selected from the group consisting of yttrium oxide, calcium oxide, magnesium oxide, titanium oxide and other rare earth oxides in the form of solid solutions, which are obtainable and preferably obtained by fusing alumina-zirconia abrasive materials, quenching fused materials to obtain an ingot, crushing the ingot and subjecting the crushed ingot to a heat treatment at a higher temperature than the phase transition temperature of zirconia