Materials and Construction
Copper is dissolved from its ore by H₂SO₄ in a percolation tank made of

High silicon iron (14% Si)
Reinforced concrete lined with lead
Stainless steel
Wood

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Materials and Construction
Pure nickel is

Ferromagnetic above its curie point (i.e., 415°C)
Having h.c.p. crystal lattice
Not resistant to oxidation at high temperature
Ferromagnetic at room temperature

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