Electrochemical and metallurgical industry . concludes liial llie separation of tin andlead is practicable in a galvanic couple or short-circuited cell,in which solid lead oxide serves as cathode .and the lead-tinalloy as anode with an alkaline electrolyte at a temperatureof over 35° C. The tin from the lead-tin alloy passes into thesolution, while the lead oxide is reduced to lead. If the platesof the tin-lead alloy arc thick, it is necessary to remove atintervals the layer of spongy lead from the surface from whichthe tin has been leached out. The author recommends to usealloy plates of not
Electrochemical and metallurgical industry . concludes liial llie separation of tin andlead is practicable in a galvanic couple or short-circuited cell,in which solid lead oxide serves as cathode .and the lead-tinalloy as anode with an alkaline electrolyte at a temperatureof over 35° C. The tin from the lead-tin alloy passes into thesolution, while the lead oxide is reduced to lead. If the platesof the tin-lead alloy arc thick, it is necessary to remove atintervals the layer of spongy lead from the surface from whichthe tin has been leached out. The author recommends to usealloy plates of not more than I mm. thickness, since withthicker plates losses of tin are unavoidable. IncrcasiuR the Speed of Copper Deposition.—\i has longbeen known that the deposition of a metal from its salt byelectrolysis depends essentially on the condition that a suffi-cient number of metal ions are always in contact with the sur-face of the cathode. For this reason stirring or heating areadvantageous, since both means tend to bring new ions to the. FIG. I.—OZONIZER. cathode. In Electrochem. Zcit. of November, S. von Max-imowitsch describes another metiiod which has the same consists simply in a horizontal arrangement of the elec-trodes, the anode being placed above the cathode. Since thesolution of the copper salt when giving off copper to thecathode becomes lighter, the light solution rises upwards, andnew fresh solution of the copper salt is carried to the cathode. Ozouizer.—A new ozonizer devised by A. Rosenberg andshown in Fig. i, is described in the Loud. Elec. Rev.,of Novem-ber II, as follows: Each element of the ozonizer consists of athin sheet of highly insulating material, such as micanite,against which arc applied, on either side, sheets of coppergauze having 40 meshes to the inch. These sheets are con-nected alternately to the two poles of the step-up transformer,which gives a potential difference of 4300 volts, this havingbeen found by experiment to be the bes
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectmetallurgy
