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Keywords: hydrometallurgy, hydroxyoximes, LIX, copper ore, copper concentrate Introduction Ammonia leaching is frequently used in hydrometallurgy for processing of oxide and sulfide ores, concentrates or by-products, particularly those containing significant amounts of carbonate rocks, which during the acidic leaching contribute to increased
applied to leach copper, due to its numerous advantages on the ... dissolution kinetics of malachite in ammonia- ammonium carbonate solution at room temperature, and reached an ... Ammonia/nitric Acid Leaching of Copper- Cobalt Oxidized Ore Kalanga Gracias. Tshilombo, A.F. Mulaba-Bafubiandi
Aug 21, 1979· By this step of leaching copper values with aqueous ammonium carbonate at elevated temperatures in the presence of an oxygen-containing gas, an aqueous leach liquor is obtained containing ammonia complexes of copper carbonate, principally Cu(NH 3) 4 CO 3, and ammonia complexes of copper sulfate, principally Cu(NH 3) 4 SO 4.
The leaching solution is a mixture of ammonium carbonate and ammonium hydroxide and it is preferably carried out in the presence of an oxidizing gas, for example air or oxygen to oxidize cuprous ions into cupric ions. Further, depending on the potential pH diagram of Cu-NH 3-H2O system, metallic copper can be easily oxidized in an ammonical ...
Copper-bearing scrap materials are charged into large leaching vats and flooded with a dilute oxidized solution of ammoniacal copper ammonium carbonate. After the vessels are full of solution, the latter is gently circulated through the tanks, pumped through an oxidizing tower and returned to the tanks.
PDF | The leaching of oxide copper ore containing malachite, which is the unique copper mineral in the ore, by aqueous ammonia solution has been studied. The effect of leaching time, ammonium ...
Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate solution with persulfate LIU Zhi-xiong1, 2, YIN Zhou-lan 1, HU Hui-ping1, CHEN Qi-yuan1 1. School of Chemistry and Chemical Engineering, Central .
The rate of copper leaching shows that the surface reaction model applies best to this system. The activation energy was 11.5 kJ/mol at 25 °C and 57.6 kJ/mol at 60 °C. The reaction order with respect to ammonia was 1.9 and for ammonium carbonate it was 4.0. The leaching kinetic data for cobalt from monometallic cobalt sulfide, showed that the
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METAL RECOVERY FROM SECONDARY COPPER CONVERTER DUST BY AMMONIACAL CARBONATE LEACHING By Robert C. Gabler, Jr.,1 and Jack R. Jones2 ABSTRACT Effective recycling or disposal of flue dusts is a continuing problem, particularly for secondary smelters
After an initial reduction step with at 600°C, leaching at room temperature and atmospheric pressure with aqueous ammonia-ammonium carbonate and ammonia-ammonium sulfate solutions yielded high ...
AMMONIA LEACHING Abstract-of the Disclosure An improved process for obtaining copper from a copper sulfide, in which: the copper sulfide is treated with oxygen and an aqueous leaching solution of ammonium carbonate, to form a leach liquor which contains ammonia complexes of copper sulfate and copper carbonate; the leach liquor is heated to form gaseous ammonia and carbon dioxide; the leach ...
Flue dust was leached at room temperature with an alkaline solution of (NH4)2CO3 and NH4OH to solubilize ZnO and Zn metal. Some copper, lead, tin, and most of the zinc were dissolved in the leach step. Copper, lead, and tin were recovered in the cement product. The Zn in the filtrate was precipitated by pH adjustment to neutral using CO2 injection.
Aug 21, 1979· An improved process for obtaining copper from a copper sulfide, in which: the copper sulfide is treated with oxygen and an aqueous leaching solution of ammonium carbonate, to form a leach liquor which contains ammonia complexes of copper sulfate and copper carbonate; the leach liquor is heated to form gaseous ammonia and carbon dioxide; the leach liquor is treated with a .
Copper ammonium carbonate is an inorganic fungicide primarily utilized for wood treatment and in copper tolerant crops such as wheat, tomato, barley, sugarbeets, cherries, carrots, strawberries, almonds, apples, lettuce and bananas among several others. The fungicide is available in aqueous solution formulation in the market.
The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue. The main copper minerals contained in the flotation tailings are chrysocolla, malachite, and cuprite, with the copper .
Nickel and copper were co-extracted from ammoniacal ammonium sulfate leach liquors (pH-9.5) with LIX 64N extractant in a laboratory-size mixer-settler continuous circuit. Three extraction stages resulted in >99-pct extraction of nickel, substantial copper extraction, and essentially no cobalt extraction from leach .
The leaching kinetic data for cobalt from monometallic cobalt sulfide, showed that the process follows the surface reaction model similar to copper, with a steady activation energy of 6.5 kJ/mol. In contrast to nickel, the leaching of cobalt from cobalt sulfide had a higher order with respect to ammonium carbonate of 1.8 than with respect to ...
As given in Fig. 1, ammonium chloride shows the lowest copper leaching rate while copper is more favourable to be leached when ammonium carbonate is used than other ammonium salts (Temperature: 18 °C, ammonia content 7.8 wt.%, solid to liquid .
copper scrap leaching ammonia · By this step of leaching copper values with aqueous ammonium carbonate at elevated temperatures in the presence of an oxygen-containing gas, an aqueous leach liquor is obtained containing ammonia complexes of copper carbonate, principally Cu(NH 3) 4 CO 3, and ammonia complexes of copper sulfate, principally Cu(NH 3) 4 SO 4.
· An improved process for obtaining copper from a copper sulfide, in which: the copper sulfide is treated with oxygen and an aqueous leaching solution of ammonium carbonate, to form a leach .
Leaching Coarse Native Copper Ore With Dilute Ammonium. Experiments on ammonium carbonate leachng of native copper ores crushed to 1-inch size showed that in 30 days 55 percent of the copper was extracted from 0.7 percent copper conglomerate-type ore, and 85 percent was extracted from 2.1 percent copper amygdaloid-type ore.
Ammonium carbonate is a salt with the chemical formula (NH 4) 2 CO 3. Since it readily degrades to gaseous ammonia and carbon dioxide upon heating, it is used as .
Alternatives were developed to the conventional ammoniacal carbonate leaching-steam stripping procedure for recovering copper as an oxide from contaminated scrap metal. By entraining air bubbles in the leach solution, the copper dissolution rate was increased to 1.5 G/in2 of copper surface per hour ...
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