Extraction of elemental elements of the copper subgroup

1.
Extraction of Copper

Copper oxide ore and coke can be heated together to directly obtain metallic copper
.

A large amount of copper is produced using chalcopyrite as a raw material
.

In an electrolytic cell containing a mixed solution of CuSO ₄ and H ₂ SO ₄ , blister copper is used as an anode and pure copper is used as a cathode for electrolysis to obtain refined copper
.

2.

Gold Au exists as a simple substance, and its density (19.
3g·cm ^-3 ) is much larger than that of sand (about 2.
5g·cm ^-3 ).
The gold brought into the river sinks into the lower part of the sand under the erosion of water.
The traditional "gold rush" is mainly to obtain gold from the river sand
.

The silver in the ore is converted into silver cyanide , and then replaced with a more active metal such as zinc to obtain elemental silver.
Finally, pure silver is refined by electrolysis
.

There are two methods for smelting gold from ore, namely amalgam and cyanidation
.

In actual production, the amalgam method is used first, followed by the cyanidation method, and the two methods are used in combination
.