Prominent copper sulfide minerals include Cu2S (chalcocite) and CuS (covellite). In the mining industry, the minerals bornite or chalcopyrite, which consist of mixed copper-iron sulfides, are often referred to as "copper sulfides". In chemistry, a "binary copper sulfide" is any binary chemical compound of the elements copper and sulfur. Whatever their source, copper sulfides vary widely in composition with 0.5 ≤ Cu/S ≤ 2, including numerous of non-stoichiometric compounds.
Monosulfides, 1.6 ≤ Cu/S ≤ 2: their crystal structures consist of isolated sulfide anions that are closely related to either hcp or fcc lattices, without any direct S-S bonds. The copper ions are distributed in a complicated manner over interstitial sites with both trigonal as well as distorted tetrahedral coordination and are rather mobile. Therefore, this group of copper sulfides shows ionic conductivity at slightly elevated temperatures. In addition, the majority of its members are semiconductors.
Mixed monosulfide and disulfide compounds of copper contain both monosulfide (S2−) as well as disulfide (S2)n− anions. Their crystal structures usually consist of alternating hexagonal layers of monosulfide and disulfide anions with Cu cations in trigonal and tetrahedral interstices. CuS, for example, can be written as Cu3(S2)S. Several nonstoichiometric compounds with Cu:S ratios between 1.0 and 1.4 also contain both monosulfide as well as disulfide ions. Depending on their composition, these copper sulfides are either semiconductors or metallic conductors.
At very high pressures, a copper disulfide, CuS2, can be synthesized. Its crystal structure is analogous to that of pyrite, with all sulfur atoms occurring as S-S units. Copper disulfide is a metallic conductor due to the incomplete occupancy of the sulfur p band.
Publication No. AU2009201732 (A1) Published on Feb. 11, Assigned to Nippon Mining & Metals for Copper Sulfide Ore Leaching Method
Feb 18, 2010; PHILLIP, ACT, Feb. 18 -- Manabu Manabe has developed a method of leaching copper sulfide ore with the use of iodine. The patent...
US Patent Issued to Tatung and Tatung University on March 27 for "Porous Copper Sulfide Nano/ micro Hollow Sphere and Method for Preparing the Same" (Taiwanese Inventors)
Mar 31, 2012; ALEXANDRIA, Va., March 31 -- United States Patent no. 8,142,755, issued on March 27, was assigned to Tatung Co. and Tatung...