The Recovery of Copper in Sulphide Ores by Roasting, Leaching, and Electrolysis

Sulphide ores of copper are insoluble in dilute sulphuric acid leaching solutions, but a very high extraction can be obtained if the copper ore is in the oxidized condition. The problem is to convert the sulphide into the oxide form. This can be done by giving the sulphide ore an oxidizing-sulphatizing roast. Copper sulphate is soluble in water, so acid will be saved in the leaching process if copper sulphate is present. The iron in the copper sulphide ores is present as pyrite, or in combinations as bornite, or chalcopyrite.

Alkali Leaching of Antimony Sulphide and Electrolytic Recovery of Antimony from the Resulting Leach Solution

It is the purpose of this investigation to obtain some insight into optimum conditions for leaching Stib­nite with sodium hydroxide solution and also to steady the factors affecting the electrolysis of the resulting solution.

Flotation of a Complex Sulphide Ore Containing Tetrahedrite

The ore investigated in this thesis is a zinc-copper-lead ore. Microscopic analysis of this complex sulphide ore showed it to contain pyrite, sphalerite, arsenopyrite, galena, chalcopyrite, tetrahedrite, and covellite, with quartz as the gangue constituent.

Three Lumps of Coal for the Working Poor

A Montana Public Radio Commentary by Evan Barrett. Published newspaper columns written by Evan Barrett on this topic, which vary somewhat in content from this commentary, appeared in the following publications: Missoulian, December 31, 2013 Montana Standard, February 7, 2014