Thermite process

What is Goldschmidt thermite process?

Solution

The process of reduction of a metal oxide to the metal with the help of aluminium powder, which liberates large amount of heat to produce the metal in its molten state, is called Goldschmidt thermite process.

How is gold recovered?

Solution

Gold being a noble metal occurs in its native form. It is further purified by the process of leaching or precipitiation called hydrometallurgy. The native gold in its complex form is first precipitated with potassium cyanide solution. It is then recovered from the solution by adding scrap zinc.