9 Terms
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Mineral mining
The extraction of valuable minerals or other geological materials from the earth for economic interests.
Industry: Mining
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Mineral mining
Acheson process
Mining; General mining
A process for the production of artificial or synthetic graphite. It consists of sintering pulverized coke in the Acheson furnace at 2,760 to 3,316 degrees C.
Dow process
Mining; General mining
A process for the production of magnesium by electrolysis of molten magnesium chloride.
Pidgeon process
Mining; General mining
A process for the production of magnesium by the reduction of magnesium oxide with ferrosilicon.
Hopfner process
Mining; General mining
A process for the recovery of copper in which a solution of cuprous chloride in sodium or calcium chloride is used to dissolve copper sulfides. The solution is then electrolyzed in tanks with ...
Moissan process
Mining; General mining
A process for the reduction of chromic oxide with carbon in an electric furnace, the hearth of which is lined with a calcium chromite prepared by heating together lime and chromic oxide.
dense-medium process
Mining; General mining
A process for the washing of coal, in which the desired separation is effected in a dense medium.
Lehmann process
Mining; General mining
A process for treating coal by disintegration and separation of the petrographic constituents (fusain, durain, and vitrain). It consists of subjecting the coal to resilient disintegrating or ...
