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46 THE MANUFACTURE OF CHEMICALS BY ELECTROLYSIS solutions of the precipitating salt and a low current density, if regular precipitates are to be obtained and the formation of crusts avoided. But, on the other hand, a more finely divided product is obtained by high concentration of the precipitating salt and a high current density, so that there are two opposing sets of conditions which must be suitably adjusted to ob- tain a good product. ZINC WPITE has been produced with some success, and a brief account of the processes employed has been given 1 by E. Leriche. It is certainly difficult to prepare by electrolysis a white lead afc good as that formed in the older Dutch process. This aspect of the problem was discussed after a paper 2 read by F. M. Perkin in 1911. before the Paint and Varnish Society THE SEPARATION OF THE EARE EARTH OXIDES. 3 Eecent work by L. M. Dennis and his co-workers has shown that electrolysis may be of considerable value in effecting a complete or partial separation of the oxides of the rare earth metals. From a neutral solution of the nitrates of neodymium, praseodymium, lanthanum, and samarium, nearly all the lanthanum is deposited as hy- droxide in the last fractions discharged on the cathode. The hydroxides are deposited fractionally in order of their basicity, and the deposition is not dependent upon the 1 2 3 Int. Gong. App. Chem., 1909, X, 45. Oil cmd Colour Trades Journal, 1911,39, 457,578. J. Am&r* Ghent. Soc, 1915, 37,131,1963.PDF Image | MANUFACTURE OF CHEMICALS BY ELECTROLYSIS
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