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ELECTEOLYTIO PEEPABATION OP PIGMENTS 43 ing of 9 parts of sodium chlorate and 1 part of sodium carbonate. Carbon dioxide is passed in near the cathode during electrolysis, and the anode of lead remains clean. 2 Luckow employed a current density of 0*25 amp. per dm. , and obtained 3*5-4 kgs. of white lead per K.W.H. l Lead chromate and lead sulphate can be produced in a similar manner, but instead of carbon dioxide it is neces- sary to add chromic acid in the first case, and sulphuric acid in the second case, to maintain the concentration of sodium chromate or sodium sulphate. 2 Cuprous oxide may be formed by electrolysing a com- mon salt solution which contains a small quantity of alkali, if a copper anode be employed. It has been found that the formation of large particles of dark colour is favoured by low current density and high temperature, whilst the addition of a small quantity of gelatin diminishes the size of the particles and lightens their colour. The colour and regularity of the product are improved by the addition of 3 a small quantity of sodium nitrate to the electrolyte. The nitrate must be replenished at intervals since it is converted into nitrite during the process. 4 LEAD PEROXIDE is formed if between lead electrodes a 1*5 per cent, solution of sodium sulphate (99'5 parts) and sodium chlorate (0*5 part) be electrolysed with a current 2 density of *5amp. per dm. this solution, and it should be acidified with sulphuric acid. 1 2 J. Phys.Ohm., 1909,13, 256,332. Eng, Pat. 14310 (1915). U.S. Pat. 626330 (1899). 34 Air should be blown through Le Blanc and Bindsohedler, Zeitsch. EUMrochem., 1902, 8, 255.PDF Image | MANUFACTURE OF CHEMICALS BY ELECTROLYSIS
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