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In the electrolytic refining of blister ...

In the electrolytic refining of blister copper, the total number of main impurities, from the following, removed as anode mud is __________.
Pb, Sb, Te, Ru, Ag, Au and Pt

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Total number of main impurities in electrolysis of blister copper: Au,Ag,Pt,Ru,Th,Te,Sb,Se

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