Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Refining of copper

Silver is also recovered during electrolytic refining of copper. Commercial fine silver contains at least 99.9% silver. Purities of 99.999+% are available commercially. [Pg.64]

Acetonitrile also is used as a catalyst and as an ingredient in transition-metal complex catalysts (35,36). There are many uses for it in the photographic industry and for the extraction and refining of copper and by-product ammonium sulfate (37—39). It also is used for dyeing textiles and in coating compositions (40,41). It is an effective stabilizer for chlorinated solvents, particularly in the presence of aluminum, and it has some appflcation in... [Pg.219]

Impurities can be removed by formation of a gaseous compound, as in the fire-refining of copper (qv). Sulfur is removed from the molten metal by oxidation with air and evolution of sulfur dioxide. Oxygen is then removed by reduction with C, CO, in the form of natural gas, reformed... [Pg.169]

Primary smelting and refining of copper 3334 Primary production of aluminum 3339 Primary smelting and refining of nonferrous metals, except copper and aluminum 3341 Secondary smelting and refining of nonferrous metals... [Pg.56]

We have already described the refining of copper and the electrolytic extraction of aluminum, magnesium, and fluorine. Another important industrial application of electrolysis is the production of sodium metal by the Downs process, the electrolysis of molten rock salt (Fig. 12.15) ... [Pg.634]

Silver, Ag, is rarely found as the metal. Most is obtained as a by-product of the refining of copper and lead, and a considerable amount is recycled through the photographic industry. Silver has a positive standard potential, and so it does not... [Pg.786]

C20-0022. Refer to the standard reduction potentiais for various metai cations (see Appendix F) and use these to predict which metais wiii be found in the anodic residue that resuits from the eiectroiytic refining of copper. [Pg.1480]

In contrast to the fire refining of copper, where the oxidation stage needs to be followed by a deoxidation step, no deoxidation step is necessary in the fire refining of lead. This is because the solubility of oxygen in liquid lead at typical refining temperatures is quite low (2 10 2 to ltT1 at-% at 600 to 700 °C). [Pg.430]

M. Owen and J. S. Jacobi, High Intensity Refining of Copper at James Bridge, J. of Metals, p. 10, April 1975. [Pg.735]

Preparation. Selenium is normally extracted as a by-product from electrolytic refining of copper. [Pg.515]

Selenium is recovered from anode muds or slimes in electrolytic refining of copper. Anode mud is treated with sulfuric acid and roasted. Selenium is converted to its dioxide, which vaporizes and is collected in a wet scrubber system. [Pg.813]

Electrolytic Refining of Copper. Immerse a carbon cathode and an anode cut out from a strip of crude copper into a 300-ml beaker. Pour a 20% sulphuric acid solution into the beaker. The current... [Pg.89]

Also the description by Theophilus of the refining of copper is characterized by the same authority as the first notice of the process of poling, essential in the production of malleable copper. [Pg.226]

Tellurous acid can be prepared from the residues from the electrolytic refining of copper by treating them with a solution of ammonia. On the addition of acetic acid to the resulting solution tellurous acid is obtained as a precipitate. When this precipitation is carried out in the cold the product obtained is readily soluble in alkali hydroxide, but if the precipitation takes place in a hot solution the product tends to be insoluble in the alkali hydroxides.2... [Pg.382]

In the electrolytic refining of copper, blister copper is used as the anode and oxidized. The copper(II) ion that is produced from its oxidation is then reduced at the cathode to give a metal with a much higher purity. The impurities in the blister copper include iron, nickel, silver gold, cobalt, and trace amounts of other metals. The material that is not... [Pg.742]

FIGURE 18.19 Electrorefining of copper metal, (a) Alternating slabs of impure copper and pure copper serve as the electrodes in electrolytic cells for the refining of copper, (b) Copper is transferred through the CuS04 solution from the impure Cu anode to the pure Cu cathode. More easily oxidized impurities (Zn, Fe) remain in solution as cations, but noble metal impurities (Ag, Au, Pt) are not oxidized and collect as anode mud. [Pg.798]

These are very unreactive metals. Silver exists mainly as silver sulfide, Ag2S (silver glance). The extraction involves treatment of the pulverised ore with sodium cyanide. Zinc is then added to displace the silver from solution. The pure metal is obtained by electrolysis. Silver also exists to a small extent native in the Earth s crust. Gold is nearly always found in its native form (Figure 10.17). It is also obtained in significant amounts during both the electrolytic refining of copper and the extraction of lead. [Pg.171]

Each industrial chemical process has as its objective the economical production of a particular primary product. It is frequently true that, in attaining this objective, one or more by-products may become available. If these by-products can be disposed of at a profit, this serves to decrease the overall cost of operation and to permit the sale of the primary product at a lower, more favorable, competitive price. Thus, the cost of electrolytically refined copper is dependent on the recovery and sale of the by-products—silver, gold, platinum, and palladium. These precious metals are recovered in large quantities from accumulated anode sludges. Fully one-fourth of the total production of silver, about one-eighth of the gold, and lesser quantities of platinum and palladium are obtained as by-products of the electrolytic refining of copper. [Pg.527]

Large quantities of this acid are used in the metallurgical industries in the pickling of iron and steel, in the production of zinc, in the electrolytic refining of copper and other metals, in electroplating operations, and so forth. [Pg.618]


See other pages where Refining of copper is mentioned: [Pg.421]    [Pg.421]    [Pg.379]    [Pg.169]    [Pg.256]    [Pg.458]    [Pg.754]    [Pg.378]    [Pg.1475]    [Pg.5]    [Pg.428]    [Pg.718]    [Pg.524]    [Pg.458]    [Pg.95]    [Pg.141]    [Pg.792]    [Pg.917]    [Pg.467]    [Pg.379]    [Pg.576]    [Pg.867]    [Pg.526]    [Pg.556]    [Pg.501]    [Pg.335]    [Pg.183]    [Pg.343]   
See also in sourсe #XX -- [ Pg.1080 ]




SEARCH



Electrolytic Refining of Copper

© 2024 chempedia.info