Copper Refining

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McGraw-Hill Book Compay, 1921 - Copper - 211 pages
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Page ii - Electrical \Xforld v Engineering News-Record American Machinist <? Ingenieria Internacional Engineering 8 Mining Journal ^ Power Chemical 6 Metallurgical Engineering Electrical Merchandising ELECTRICAL METERS PREPARED IN THE EXTENSION DIVISION OF THE UNIVERSITY OF WISCONSIN CYRIL M.
Page 197 - At moderate densities copper readily gives a good adherent deposit. The same may be said of gold. Silver gives normally a loose crystalline deposit. Nickel is nodular, while lead and zinc tree very badly. By the proper use of addition agents all of these deposits may be made smooth and coherent. In fact it was not until the value of addition agents was more or less understood that lead could be handled at all. In the early copper plants a great deal of trouble was...
Page 199 - ... electrolysis. In the electrolysis of zinc sulphate using an insoluble anode the content of free sulphuric acid gradually increases and unless the cathode is absolutely pure zinc resolution is very active. Perfectly pure zinc is so nearly insoluble in sulphuric acid that it is quite difficult to get it in solution for analysis. But if a nodule of cathode zinc is immersed in dilute sulphuric acid in a test...
Page 195 - ... of the copper being recovered as cement. Electrolytic silver has to compete with the older sulphuric acid method of parting. The latter is easy to operate and ties up less silver, but it will not make a product so low in gold as the electrolytic. It is still indicated, however for small plants and for those which are used spasmodically.
Page 145 - ... of these tests is presented in the diagram on figure 37. While the presence of all the impurities experimented with lowered the conductivity of the copper, it will be noted, remarked Addicks, that those elements — such as lead, bismuth, and tellurium — which are known to make copper brittle, have but slight effect upon the conductivity; while those which make excellent bronzes — such as phosphorus, aluminum, and silicon — cause a marked depression in the conductivity curve. To remove...
Page 196 - When electrolyzing silver a nitrate electrolyte is employed, as silver sulphate is not a readily soluble salt. The amount of free acid carried is necessarily low, as nitric acid is expensive and decomposes under the conditions of electrolysis. Copper concentrates in the electrolyte and is removed by withdrawals, while gold remains unattacked in the slimes.
Page 199 - ... a vigorous evolution of hydrogen will start at once. This is probably due to galvanic action, and the whole secret of successful zinc electrolysis lies in the passivity of pure zinc in sulphuric acid. This calls for a degree of purity in the electrolyte which would be quite uncommercial were it not for the fact that zinc dust readily throws down most of the impurities to be dealt with after the liquor from the leaching tanks has been neutralized. The last traces of some difficult elements, such...
Page 199 - As soon as a complex or insoluble anode is substituted, however, the oxidizing effect of the current is in part or in whole employed in the solution of anode impurities, the oxidation of suitable salts in the electrolyte or in the decomposition of water with escape of oxygen as such. This introduces several new problems. A moderate amount of an oxidizable impurity, such as nickel...
Page 13 - The great difficulty is that the actual losses made are clearly discernible only after several years, as the results from single yearly inventories are always more or less clouded by anode furnace bottom absorptions which vary from year to year, and the punishment comes so long after the crime that it is very easy to be lax to the immediate benefit of apparent operating costs. Molten silver should be handled like a volatile liquid.
Page 197 - Moebius system or shoveled by hand from the horizontal carbon cathode of the Thum cell. These crystals are readily washed free of electrolyte and fed to retorts for melting. Lead may be beautifully controlled by addition agents. The exact amount to be added varies from time to time and is determined by experiment and careful watching of the fresh deposit on special strips hung for the purpose. Zinc is generally plated in coherent form on an aluminum cathode, from which it is peeled every forty-eight...

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