Mineral mining

Mineral mining

The extraction of valuable minerals or other geological materials from the earth for economic interests.

Industry: Mining

Contributors in Mineral mining

Mineral mining

A process for making sulfuric acid. Sulfur dioxide gas (obtained by burning pyrite) is purified by electrical precipitation, and is passed over a catalytic agent to form sulfur trioxide that combined ...

Siemens direct process

Mining; General mining

A process for making wrought iron directly from iron ore, without the previous production of pig iron.

lime-soda sinter process

Mining; General mining

A process for manufacturing alumina, Al 2 O 3 . The raw material, such as clay or anorthosite, is sintered with limestone and soda ash to form sodium aluminate and calcium silicate. This sinter is ...

open-hearth process

Mining; General mining

A process for manufacturing steel, either acid or basic, according to the lining of the reverberatory furnace, in which selected pig iron and malleable scrap iron are melted, with the addition of ...

Sperry process

Mining; General mining

A process for manufacturing white lead in which softened and desilverized lead anodes, preferably containing some bismuth, are placed in the Sperry cells. Direct current dissolves the lead from the ...

Talbot process

Mining; General mining

A process for protecting the inside of cast-iron pipes with a coating of sand and bitumen.

MacArthur and Forest cyanide process

Mining; General mining

A process for recovering gold by leaching the pulped gold ore with a solution of 0.2% to 0.8% potassium cyanide, KCN, and then with water. The gold is obtained from this solution by precipitation on ...