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48 THE MANUFACTURE OF CHEMICALS BY ELECTROLYSIS disappear when the ratio reaches the value 1*70. The magnesium in the deposit apparently does not affect its pyrophoric nature, but the presence of carbon is essential. 2 Current density employed is usually 0*6-3*3 amps, per dm. These deposits may prove useful for the same purposes as those to which the cerium-iron alloys (Misch Metall) have been adapted. By substituting cerous chloride for magnesium chloride in the solution the pyrophoric nature of the deposit is not increased. Temperature has considerable influence, be- cause in certain cases the deposit formed in the cold is not pyrophoric, whilst that produced at 60° C. exhibits pro- nounced pyrophoric properties. Analysis of these alloys always shows the presence of a small quantity of mag- nesium, generally between 0'4 and 0'5 per cent. TUNGSTEN BRONZES. Complex tungstates (polytungstates) are formed at the anode during the electrolysis of normal alkali tungstates. 1 E. Engels has shown that tungsten bronzes can be pre- pared by electrolysing a fused mixture of tungstic acid and alkali carbonate. Mixtures of barium and sodium tungstates in the molten state give, with a current density of about 45 amps, per 2 dm. at a pressure of 1*6 volts, bronzes which correspond to the following formulae:— 2BaW4O12, 3Na2W5O15 and BaW4O12, 5Na2"W3O9. This may prove to be a convenient method for preparing various tungsten bronzes. 1 Zeitsch. anorg. Chem., 1903, 37,125.PDF Image | MANUFACTURE OF CHEMICALS BY ELECTROLYSIS
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