ammonia leaching of copper ore

Characterization and kinetic study on ammonia leaching of ...

In general, the major advantage of ammonia leaching process lies in its selectivity towards copper since ammonia forms soluble ammine complex with Cu ions and iron is completely rejected as iron oxides. Aqueous ammonia as a leaching agent is fairly non-corrosive and leaching reactions occur in relatively mild conditions 9 .

PDF Ammonia Leaching: A New Approach of Copper Industry in ...

Ammonia leaching is a promising method for processing low-grade copper ores, especially those containing large amounts of oxidized copper. In this paper, we study the effect of Si-containing ...

Ammonia Leaching: A New Approach of Copper Industry in ...

The investigations in this field indi e more frequent use of this method for extracting copper from ore and concentrate relative to other basic metals. In this paper, an attempt was made to describe the basis and different ammonia leaching methods and present the major research activities in this field for copper.

COPPER II EXTRACTION FROM AMMONIA LEACH SOLUTION

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

Characterization and kinetic study on ammonia leaching of ...

Ammonia leaching kinetics of a complex Cu-ore assaying 8.8% Cu and 36.1% Fe was examined. Mineralogical characterization indi ed that the major phase of the ore was siderite with chalcopyrite as the major sulfide mineral.

Ammoniacal Percolation Leaching of Copper Ores: Canadian ...

The general feasibility of ammoniacal percolation leaching of copper sulphide ores has been demonstrated. The rates are comparable to those of conventional ferric sulphate-sulphuric acid systems, but without the attendant problems of carbonate or iron dissolution, For the ore column heights studied, the copper leaching rate increased approximately as the square root of the total NH 3 ...

ammonia leaching of copper ores - Triple Helix

Ammonia leaching was first used for recovery of non-ferrous metals such as copper from oxide ores or ores containing pure copper. although it has been less studied than the chemical agents used in leaching. nickel and cobalt to the extractive metallurgy of zinc. silver and gold Meng and Kenneth.INTRODUCTION Although the use of sulfuric acid

Leaching of copper from tailings using ammonia/ammonium ...

Abstract: The leaching of copper from the tailings of Baifang Copper Mine in Hunan province in China by aqueous ammonia/ammonium chloride solutions has been studied. The tailings belong to a low-grade and high-alkaline copper ore. The effect of leaching time, the concentration of ammonia, solid/liquid ratio and temperature were investigated.

Ammonia Leaching: An Alternate Route for Copper Recovery - AusIMM

The use of ammonia as a leaching agent in the recovery of copper from ores and concentrates has a number of potential benefits. These include the ability to treat ores with an acid consuming gangue, non-corrosivity, the insolubility of iron in the solution and increased selectivity.

Optimal Conditions for Ammonia Leaching of Copper/Chalcocite ...

Ammonia leaching can be used in non-oxidative, oxidative and reductive leaching 16 . The ammonia leaching process is more environment friendly than conventional acid heap leaching, which uses sulphuric acid to dissolve copper and cobalt 11 . The reported difficulty encountered with the ammonia leaching approach, however,

Ammonia Leaching: A New Approach of Copper Industry in ...

Ammonia and ammonium salts have been recognized as effective leaching agents in hydrometallurgical processes due to low toxicity and cost, easy recovery and high selective recovery of metals.

Ammonia/nitric Acid Leaching of Copper- Cobalt Oxidized Ore

acid/ammonia ratio on the leaching of rich - cobalt copper oxidised ore. It will also evaluate the effect of key parameters time, ammonia concentration, and pH on the recovery of Cu, during nitric acid/ammonia leaching of copper- cobalt oxidised ore. II. EXPERIMENTAL A. Materials . Copper ores present in the southern Democratic Republic of

Ammonia Leaching: A New Approach of Copper Industry in ...

The investigations in this field indi e more frequent use of this method for extracting copper from ore and concentrate relative to other basic metals. In this paper, an attempt was made to describe the basis and different ammonia leaching methods and present the major research activities in this field for copper.

Industrial Appli ion of Ammonia Assisted Cyanide Leaching ...

A description of the agitation

Use of Ammonia Salts in Selective Copper Extraction from ...

The highest copper extraction efficiency was obtained in the leaching process that was conducted with the solutions obtained by mixing ammonia salts in the best conditions. Accordingly, as a result of 6 h of leaching at 30 C in the presence of 22.5% NH 4 OH and 100 g/L NH 4 2 S 2 O 8 , 91.47% of the copper was transferred into the solution ...

The treatment of copper-gold ores by ammonium thiosulfate ...

The appli ion of ammonium thiosulfate for the treatment of copper-gold ores has been investigated. Leaching studies were conducted with copper minerals, copper minerals with gold addition to solution and copper-gold samples of different copper and gold grades. The behaviour of thiosulfate, tetrathionate and sulfate in solution was studied using ion chromatography. The copper sulfide minerals ...

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