Este trabalho descreve as etapas de caracterização e purificação de quartzo para obtenção de um silício grau metalúrgico (SiGM) com baixo nível de impurezas. A amostra de quartzo, após as etapas de britagem, calcinação seguida de quenching e moagem autógena apresentou um teor de SiO2 de 99,5%, isto é, um aumento de aproximadamente 2% em relação a amostra original. A análise granulométrica indicou que a fração abaixo de 37 µm, correspondente a apenas 2,06% da amostra total, apresenta alto teor de impurezas, podendo ser removida, facilitando assim os ensaios de purificação. O estudo demonstrou que a amostra de quartzo beneficiada apresenta um potencial uso à produção de SiGM.
In the crystal structure of the ruthenium(III) complex, trans-[RuIII(dcbpy)2Cl2]ClO4 (dcbpy = 2,2′-bipyridine-4,4′-dicarboxylic acid, C12H8N2O4), the RuIII atom lies on an inversion centre, showing a small distortion in its octahedral environment. The Ru—Cl bond lengths are shorter than those present in the analogous trans-ruthenium(II) compound containing the bipyridine ligand. The C—O distances in the two symmetry-independent carboxylic acid moieties of the ligand are similar in one group, but different in the other. This is probably due to the different intermolecular interactions they experience with neighbouring cationic complexes. The hydrogen-bonding interactions in which they are involved form a three-dimensional structure, similar to those found in coordination polymers.
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