The Rare Earths: Their Occurrence, Chemistry, and Technology

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E. Arnold, 1915 - Всего страниц: 345
 

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Стр. x - Transactions of the Faraday Society. Transactions of the American Institute of Mining Engineers. Transactions of the New York Academy of Science.
Стр. xi - Zeitschrift für analytische Chemie. Zeitschrift für angewandte Chemie. Zeitschrift für anorganische Chemie. Zeitschrift für Biologie. Zeitschrift für Elektrochemie. Zeitschrift für Farben- und Textil-Chcmie.
Стр. x - Journal fiir praktische Chemie. Journal of the Physical and Chemical Society of Russia. Journal of the Society of Chemical Industry. Journal of the Society of Dyers and Colourists.
Стр. xiii - They form a group to themselves, sharply demarcated from the other elements, and it is my belief that by following the study of them to the utmost limits, we may arrive at the explanation of what the chemical elements really are and how they originated, and discover the reasons for their properties and mutual relations.
Стр. 256 - ThF4,4H2O, is precipitated by addition of hydrofluoric acid to a solution of a thorium salt, or by the action of the acid on the hydroxide. Hydrofluosilicic acid also throws down the fluoride, even in 1 Cf.
Стр. 257 - Chem. 1907, 53, 74. the cold, from solutions of thorium salts. The fluoride is insoluble in water and mineral acids, as well as in excess of precipitant ; this behaviour allows of a complete and easy separation of thorium from titanium and zirconium.
Стр. 324 - In 1906 it was proposed s for the manufacture of crucibles in which rock-crystal (quartz) is fused for the preparation of quartz-glass, since zirconia is not attacked by molten silica. It promises to be of the greatest use in all cases where a very refractory material, stable towards the ordinary chemical reagents, is required.
Стр. 318 - Salts of cerium find an application as catalysts in the manufacture of aniline black and have been proposed for use as a catalyst in the contact process for the manufacture of sulphuric acid. The oxidizing powers of cerium salts have been applied to the manufacture of a number of organic substances. Cerium sulphate has been employed in photography for removing silver from overdeveloped negatives; cerium salts are used in color photography; and the oxalate finds a very slight use in...
Стр. 70 - O'Ol per cent, of scandium, wiikite was found to contain more than one hundred times that amount. Wiikite is a black amorphous mineral found with monazite in a felspar quarry at Impilaks, Lake Ladoga, Finland. It is named after Professor WIIK, of Helsingfors (' Min. Mag.,
Стр. xiii - The rare earths constitute the most striking example of the association of chemical substances with others which are closely allied to themselves, and from which they are separable only with extreme difficulty.

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