black copper


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black copper

[¦blak ′käp·ər]
(metallurgy)
The more or less impure metallic copper (70-99% copper) produced in blast furnaces when running on oxide ores or roasted sulfide material.
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With black copper, it always effloresces a little; with iron, though, it seems to have no dealings at all, nor will it agree to join with it except by artifice; lead and tin easily and swiftly go into it.
Each individual unit consists of two glass tubes--one inside the other, separated by a vacuum--that enclose a heat pipe attached to a black copper absorber plate.
But if Sergeant Nicky Cole thought he had it bad in 'The Smoke' after being labelled a whistle blower then the racism he is about to encounter up north among his colleagues as a black copper looks set to be even worse.
Matte had to undergo further treatment before being converted into black copper, which itself had to be refined again to produce a more pure copper metal.
In this case, the globe thermometer is a black copper ball, 6 centimeters in diameter, into which is inserted a temperature-standard thermometer with a 30[degrees]-to-120[degrees] F range.
They include fluted vases and tapered bases, available in antique copper, black copper, silver plate or 24K gold-plate finish and paired with natural ivory linen shade or black lacquered parchment shade and topped with distinctive finial.
Seeking a black stain I tested copper oxide and manganese oxide at a range of concentrations preferring to work with the greeny/black of fired black copper oxide--again finding the best results around a 10 per cent concentration in water.
Neometrics square metal planter in black copper ($37 for 9-in.
Kellie-Anne was given a 'dramatic' black copper look but with subtle tones.
Seraphim, Treminco's consulting geologist for the El Magistral Project, reports that within the trenches sampled, the copper appears mainly as a black copper oxide (tenorite).

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