Removal of impurities, V-groupe elements (As, Sb, Bi), oxygen and sulfur in crude copper during Na//2CO//3-treatment has been investigated in order to propose the new process of copper refining. The test were carried out by molten copper (15g) and the various compositions of Na//2CO//3-SiO//2 flux (5g) in an alumina crucible at 1150-1250 degree C in air and Ar. V-groupe elements, especially As, Sb, were rapidly removed from crude copper melts by Na//2CO//3-treatment. For example, the arsenic level in the copper dropped sharply from 1750 ppm to 150 ppm after 30 min. . The elimination of V-groupe elements increases with increasing the basicity of flux and lowering the temperature of treatment. On the other hand, the atmosphere of treatment seems to have little influence on the elimination of impurities in these tests.
|Number of pages||6|
|Publication status||Published - 1984 Jan 1|
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