Copper cuprite

Cryolite, see Sodium hexafluoroaluminate Cryptohalite, see Ammonium hexafluorosilicate Cupric and cuprous, see under Copper Cuprite, see Copper(I) oxide... 

Ores of copper native copper, cuprite, chalcocite, chalcopyrite, malachite, azurite. Metallurgy of ores containing native copper, oxide and carbonate ores, sulfide ores. Gangue, flux, flotation, roasting of ores, matte, blister copper. Cupric compounds copper sulfate (blue vitriol, bluestone), Bordeaux mixture, cupric chloride, cupric bromide, cupric hydroxide. Test for cupric ion with Fehling s solution. Cuprous compounds cuprous chloride, cuprous bromide, cuprous iodide, cuprous oxide. Covalent-bond structure of cuprous compounds. 

Copperil) oxide, CujO, occurs naturally as the red cuprite. It is obtained as an orange-yellow precipitate by the reduction of a copper(II) salt in alkaline solution by a mild reducing agent, for example glucose, hydroxylamine or sodium sulphite ... 

Copper occasionally occurs native, and is found in many minerals such as cuprite, malachite, azurite, chalcopyrite, and bornite. 

Copper Oxides. Coppet(I) oxide [1317-39-17 is a cubic or octahedral naturally occurring mineral known as cuprite [1308-76-5]. It is ted or reddish brown in color. Commercially prepared coppet(I) oxides vary in color from yellow to orange to ted to purple as particle size increases. Usually coppet(I) oxide is prepared by pytometaHutgical methods. It is prepared by heating copper powder in air above 1030°C or by blending coppet(II) oxide with carbon and heating to 750°C in an inert atmosphere. A particularly air-stable coppet(I) oxide is produced when a stoichiometric blend of coppet(II) oxide and copper powder ate heated to 800—900°C in the absence of oxygen. Lower temperatures can be used if ammonia is added to the gas stream (27-29). 

Kupfer-asche, /. copper scale, -azetat, n. copper acetate, -azetylen, n. copper acetylide. -bad, n. copper bath, -barre, /. copper bar copper ingot, -belze, /. copper mordant, -blatt, n. copper foil, -blau, n. blue verditer, azurite. -blech, n. sheet copper, copper foil, -blel, n. copper-lead alloy, -bleiglanz, m. Min.) cuproplumbite. -bleivitriol, m. linarite. -blende, /. tennantite. -blute, / copper bloom (capillary cuprite), -braim, n. tils ore (earthy ferruginous cuprite),... 

Rot-kali, n. red prussiate of potash (potassium ferricyanide). -kiefer,/. red pine, -klee, m. red clover, -kohl, m. red cabbage, -kohle, /. red charcoal, -kupfer, -kupfererz, n. red copper, red copper ore (cuprite), -lauf, m. erysipelas. 

Cuprite (CuO) is formed as a black, nonmagnetic mineral under boiler conditions. The copper originates from brasses and cupronickels used in condensers and FW heaters. 

A single metal may be extracted from several minerals. Thus there are many minerals of copper, such as chalcocite, bornite, chalcopyrite, cuprite, native copper, and malachite one or more of these may occur in an individual deposit. Also, more than one metal may be obtained from a single mineral stannite, for example, yields both copper and tin. A mineral deposit, therefore, may yield several metals from different minerals. 

Shakudo. Shakudo is a copper alloy used in Japan since the third century b.c.e. for making decorative and ornamental objects. In addition to copper it also includes gold (1—4%), silver (about 2%), and lead (about 1%). Occasionally gold replaced part or even all of the silver. Exposed shakudo surfaces acquire a layer of patina consisting mainly of the mineral cuprite (composed of cuprous oxide), which exhibits a characteristic shine. Varying amounts of gold in the alloy are said to have a marked effect on the color and the shine (Notts 1988 Oguchi 1983). 

Copper oxide mixed ore - Type 2. In contrast to Type 1, this ore type contains cuprite, malachite and azurite as the main copper oxide minerals. This ore type predominantly contains carbonaceous gangue, and usually, significant amounts of clay-like slimes. 

Mixed copper sulphide oxide ores. These contain varieties of both sulphide and oxide minerals, and are the most complex copper-bearing ores from a beneficiation point of view. The major copper minerals present in this ore type include bomite, chalcocite, covellite, malachite, cuprite and chrysocolla. In some cases, significant amounts of cobalt minerals are also present in this ore. 

Copper oxide gold ores. Although this ore type is not abundant, they are of significant value because they contain gold. Only a few deposits in Brazil and Australia are known. The copper in these ores is represented by cuprite, native copper, antlerite and tenorite. The gold is associated with cuprite, as an auricupride and several sulphosalts. The major problem associated with treatment of this ore type is the presence of large amounts of clay slimes in the form of iron hydroxide and illite. 

Tenorite (CuO Cu = 80%, SG = 6.5) is usually present in mixed copper oxide and sulphide ore. The flotation properties of tenorite are similar to that of cuprite. 

The mixed sulphide oxide ores usually contain two or more oxide minerals, including cuprite, malachite and tenanntite. The sulphide copper minerals are represented by covellite and bomite. Examples of this type of operation are located in the former Republic of Zaire (Komoto, Dima 1 and 2 plants), and the Nchanga open pit plant in Zambia. 

Both Cu and Zn are base metals. Copper is largely mined from chalcopyrite (CuFeSj), chalcocite (CujS), cuprite (CujO), and malachite (Cu2C03(0H)2). Zinc is essentially produced from sphalerite (ZnS) and smithsonite (ZnCOs). 

Copper is the 26th most abundant element on Earth, but it is rare to find pure metallic deposits. It is found in many different types of mineral ores, many of which are close to the surface and easy to extract. It is found in two types of ores (1) sulfide ores, such as covellite, chalcopyrite, bornite, chalcocite, and enargite and (2) oxidized ores, such as tenorite, malachite, azurite, cuprite, chrysocolla, and brochanite. 

It is found in most countries of the world, but only a few high-grade deposits are cost-effective to mine. Examples of some of its ores are cuprite (CuO ), tenorite (CuO), malachite [CuCOj Cu(OH)2], chalcocite (Cu S), covellite (CuS), bornite (CugFeS ), and chalcopyrite, also known as copper pyrite. 

Leach caps have a significantly lower amount of Cu than in enrichment blankets due to downward migration and precipitation of leached copper in the form of chalcopyrite (CuFeS2) chalcocite (CU2S) and cuprite (CuO). 

Copper is distributed widely in nature as sulfides, oxides, arsenides, arsenosulfides, and carbonates. It occurs in the minerals cuprite, chalcopyrite, azurite, chalcocite, malachite and bornite. Most copper minerals are sulfides or oxides. Native copper contains the metal in uncombined form. The principal copper minerals with their chemical compositions and percentage of copper are listed below ... 

Copper(I) oxide occurs in nature as the mineral cuprite. 

Copper(I) oxide is found in nature as the mineral cuprite. Copper(I) oxide can be prepared by several methods, which include ... 

Elemental composition Cu 88.42%, 0 11.18%. The oxide may be dissolved in excess hydrochloric acid, diluted appropriately and analyzed by AA or ICP techniques (see Copper). The mineral cuprite may be identified nondestruc-tively by various x-ray methods. 

In 1826 Carl Kersten of Gottingen detected selenium in the capillary cuprite or so-called copper bloom from Rheinbreitenbach on the Rhine, which Councilor Hausmann had presented to him (39). He also found this element to be present in the earthy ferruginous cuprite (tile ore) from the same locality (39). 

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