TAILIEUCHUNG - CRYSTALLIZATION – SCIENCE AND TECHNOLOGY_2

Crystallization is one of the most ancient and interdisciplinary topics of research known to mankind. Crystals can be organic or inorganic and may be produced from melts, liquid solutions, vapors or even in solid state. Notwithstanding its inherently high complexity, the crystallization process is part of our everyday lives, from ice making in our homes to the most state-of-the-art chemical and electronic industry. In this book, our purpose was to present new insights to the reader, as well as crucial and very useful information for researchers working in this field, while simultaneously creating a comprehensive text about crystallization processes which. | 10 Crystallization of Iron-Containing Oxide-Sulphide Melts Evgeniy Selivanov and Roza Gulyaeva Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences Russia 1. Introduction The processing of the sulphide raw materials ores concentrates and mattes of non-ferrous metallurgy is related to the formation of a large amount of iron containing slags. The initial product of the oxidation of sulphides in real commercial plants is an oxide-sulphide melt in which decomposition under the action of fluxes is accompanied by matte and slag formation Selivanov et al. 2009a . The fraction of oxygen in a sulphide melt and the fraction of sulphur in an oxide melt are each controlled by the contents of silicon dioxide and iron oxides in a slag and the contents of non-ferrous metals in a matte. According to modern concepts the heterogeneity of slags is caused by mechanical matte magnetite and spinel inclusions where the spinel inclusions form during oxidation processes Selivanov et al. 2000 Spira Themelis 1969 Tokeda et al. 1983 Vanyukov Zaitsev 1969 1973 . The cooling . the crystallization of a slag leads to the formation of new oxide and sulphide phases within it. Information on the available forms of the useful components is important for the reduction of metal loss through a slag and for the selection of their re-extraction methods. A number of works are devoted to the study of the kinds of copper existing in slags. Major results are generalized in the monographs of Ruddle 1953 Vanyukov et al. 1988 Vanyukov Zaitsev 1969 1973 . Phase equilibria in the systems relevant to copper pyrometallurgy have been discussed mostly for molten states Elliott 1976 Kopylov 2001 Yazawa 1974 . It is considered that the loss of non-ferrous metals through slags is caused by their oxide sulphide and metal solubility. It was discovered that a part of copper is presented in the crystallized slag by matte mechanical inclusions Vanyukov Zaitsev 1969 1973 . Data on the copper .

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