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- W4238790738 abstract "Massive specimens of the mineral chalcocite (Cu2S), when subjected to anodic decomposition in copper refinery electrolyte (CuSO4−H2SO4) increase in potential abruptly at a transition time τ, the value of τ having a dependence on current density as defined by the equation I2τ=constant This constant is typically 2.5×108A2sec m−4, in 0.1M CuSO4, 0.1M H2SO4 solutions and is approximately proportional to the solubility of the copper salt in the electrolyte. The cause of the polarization appears to be crystallization of copper salts at the bottom of anode slime pores and cracks of steadily increasing depth, through which diffusive transport must carry the dissolving copper. With the chalcocite crushed into coarse particles and held by a textile diaphragm against a current distributor, the abrupt potential increase is delayed until the mineral is essentially decomposed because (a) local current densities on individual particles are much lower, yielding τ values longer than necessary for decomposition to penetrate to the center of the particles, and (b) the diffusive transport processes driven by the cross-sectional cell current density are supplemented by conductive and convective contributions, which successfully eliminate salt crystallization at points where such salts might impede current flow. Details of studies made on massive chalcocite (and covellite) anodes and on particulate anodes of various particle size enclosed by a diaphragm are described." @default.
- W4238790738 created "2022-05-12" @default.
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- W4238790738 date "1981-02-10" @default.
- W4238790738 modified "2023-10-16" @default.
- W4238790738 title "Direct electrorefining of chalcocite" @default.
- W4238790738 doi "https://doi.org/10.1016/0368-1874(81)87027-x" @default.
- W4238790738 hasPublicationYear "1981" @default.
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