(n.) Copper pyrites, or yellow copper ore; a common ore of copper, containing copper, iron, and sulphur. It occurs massive and in tetragonal crystals of a bright brass yellow color.
Example Sentences:
(1) On the basis of this experimental work, a flow sheet has been proposed for commercial scale biohydrometallurgical treatment of high-grade chalcopyrite materials.
(2) The bacterial oxidation of naturally occurring gallium-bearing chalcopyrite concentrate and a pure synthetic gallium (III) sulfide has been investigated at pH 1.8 and 35 degree C, using an active culture of Thiobacillus ferrooxidans.
(3) The main values for T. ferrooxidans grown on ferrous iron, chalcopyrite and lead sulfide concentrates were calculated to be 56.0, 60.1 and 54.4% GC respectively.
(4) The following compounds (at a concentration of 1%) were used as an energy source: pyrite, chalcopyrite, arsenopyrite, antimonite, galenite, sphalerite, and copper-zinc-pyrite ore. A considerable part of cells was found to be attached to the surface of crystals in the course of oxidation of the above sulfide minerals.
(5) Jarosite formation was observed during the leaching of the chalcopyrite concentrate.
(6) The microbiological leaching of a chalcopyrite concentrate has been investigated using a pure strain of Thiobacillus ferrooxidans.
(7) Among the methods tested, along with the recommended method of serial transfer in a liquid medium, were methods such as lyophilization, storage in a liquid nitrogen and mixing with sterile, inert carriers like lignite or chalcopyrite ores.
Haematite
Definition:
(n.) Same as Hematite.
Example Sentences:
(1) The study found an excess risk of non-malignant respiratory disease and of lung cancer among haematite miners.
(2) The only feature peculiar to haematite lung is the intense accumulation of iron-containing dust in and around the pulmonary blood vessels.
(3) A histological study was made of the pulmonary vasculature in two cases of haematite lung.
(4) The occlusive and obliterative vascular changes in 'haematite lung' are in reality those of silicosis which are brought about by the inhalation of silica particles with the iron sesquioxide.
(5) This could be linked to the presence of ferrous ions in this solid iron oxide, since the ferric oxides haematite and goethite are completely inactive.
(6) Two years ago, their excavations revealed that haematite-based pigments had been used to paint external walls – another transformation in our thinking about the Stone Age.
(7) The mortality risk of iron ore (haematite) miners between 1970 and 1982 was investigated in a retrospective cohort study of workers from two mines, Longyan and Taochong, in China.