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Removal of arsenic from liquid blister copper during remelting in an induction vacuum furnace
Author(s) -
J. Łabaj,
L. Blacha,
A. Smalcerz,
Bartosz Chmiela
Publication year - 2021
Publication title -
journal of mining and metallurgy. section b, metallurgy/journal of mining and metallurgy. section b, metallurgy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.42
H-Index - 20
eISSN - 2217-7175
pISSN - 1450-5339
DOI - 10.2298/jmmb210108033l
Subject(s) - mass transfer , copper , arsenic , refining (metallurgy) , metallurgy , smelting , chemistry , mass transfer coefficient , mixing (physics) , impurity , induction furnace , evaporation , metal , analytical chemistry (journal) , alloy , materials science , chromatography , thermodynamics , physics , organic chemistry , quantum mechanics
Using a reduced pressure during the smelting and refining of alloys removes dissolved gasses, as well as impurities with a high vapor pressure. When smelting is carried out in vacuum induction furnaces, the intensification of the discussed processes is achieved by intensive mixing of the bath, as well as an enhanced mass exchange surface (liquid metal surface) due to the formation of a meniscus. This is due to the electromagnetic field applied to the liquid metal. This study reports the removal of arsenic from blister copper via refining in an induction vacuum furnace in the temperature range of 1423? 1523 K, at operating pressures from 8 to 1333 Pa. The overall mass transfer coefficient kAs determined from the experimental data ranged from 9.99?10-7 to 1.65?10-5 ms-1. Arsenic elimination was largely controlled by mass transfer in the gas phase. The kinetic analysis indicated that the arsenic evaporation rate was controlled by the combination of both liquid and gas-phase mass transfer only at a pressure of 8 Pa.

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