The "soluble deep blue ammoniacal copper solution" that Philip Keene refers to in his answer is an example of a transition metal coordination complex ion In this case the major species in solution is a complex ion with copper at the center bond We have leaching of copper from tailings using ammonia Thus in this study to recover valuable metals and reduce pollution a cleaner metal extraction method from copper sulfide tailings using a combined leaching method employing ammonia solution and a novel strain of alkaline bacteria under alkaline condition was explored

Ammonia Gold Dissolution Leaching

Due to these limitations and increasingly stringent pollution control regulations the use of lixiviants other than cyanide has received considerable attention in the past few years Ammonia has already been established as an effective complexing agent for transition metals such as copper

Ammonia leaching research is carried out on a certain oxidised copper ores The effects of oxidized copper ores which came from Yunnan Province were studied in laboratory in order to find out the optimum leaching conditions under normal temperature and pressure The ores belonged to typical high binding rate minerals The optimum conditions obtained were as follows granding fineness about 90%

What is Ammonia? Ammonia is one of several forms of nitrogen that exist in aquatic environments Unlike other forms of nitrogen which can cause nutrient over-enrichment of a water body at elevated concentrations and indirect effects on aquatic life ammonia causes direct toxic effects on aquatic life

Copper Cookware Is the choice of many because it conducts heat so well Copper cookware releases copper into the food to be eaten and usually also has nickel in the coating which is another toxic heavy metal and can be very allergenic Don't cook vegetables in copper or iron pots Copper can kill vitamin C vitamin E and folic acid

Fertilized soils as well as livestock operations are also vulnerable to nutrient losses to the air Nitrogen can be lost from farm fields in the form of gaseous nitrogen-based compounds like ammonia and nitrogen oxides Ammonia can be harmful to aquatic life if large amounts are deposited from the atmosphere to surface waters

Corrosion behaviour of copper alloys in natural sea water

cracking tests with ammonia pollution are also conducted The copper alloys compared have shown rather similar behaviour in sea water In near stagnant conditions risk of corrosion initiation in sea water is high with these alloys (localised corrosion crevice corrosion close to the gasket corrosion under deposit stress corrosion cracking)

Abstract Although ammonia leaching of copper from slags has been reported generally as a part of copper slag utilization methods but no detailed studies have been reported in the literature In this research we tried to investigate the effect of different parameters on ammonia leaching of copper from copper smelting slag by identifying

The ammonia leaching plant was built in 1915 where ammonia liquefied the copper but kept the limestone in solid form The ammonia-copper solution was heated to drive off the ammonia which left behind a copper oxide containing 75% copper This was then sacked for shipment

The Phase I objective is to demonstrate the feasibility of applying recently developed enhanced ammoniacal leaching techniques and solvent extraction reagents to recycle nickel copper cobalt zinc and cadmium from hydroxide sludges such as those produced by electroplating shops metal finishers treatment of acid mine drainage and

•Lower capacity of leaching of acidic compounds •The use of ammonia is limited due to its high evaporation •May have potential at hydrostatic pressures associated with ISL •Difficulty in maintaining high concentrations of dissolved NH 3 •Extractors used for copper recovery from ammonia medium do not have high efficiency

by neutralizing the acid leach liquor or by leaching oxide copper with ammonia but neither solution was economical a molecule that extracted copper well from typical dump leach liquors (pH ~1 8) had to be built The reagent LIX 64 containing the ketoxime LIX Copper recovery using leach/solvent extraction/electrowinning technology

Copper-Ammonia Complex When concentrated ammonia solution (ammonium hydroxide) is added to a clear light blue aqueous solution of copper(II) chloride a powdery light blue precipitate of copper(II) hydroxide forms Further addition of ammonia causes the copper ion to go back into solution as a deep blue ammonia complex

A low grade copper flotation tailing from Telfer containing 1 2% Cu as chalcocite and cuprite and 5 gt-t Au was leached with ammonia cyanide and ammonia-cyanide mixtures to extract copper and/or gold Direct cyanidation extracted both copper and gold but consumed about 30 kgt 1 NaCN Pre-leaching the tailing with an aerated ammonia solution containing

Adsorption of Copper Complexes on Anion Exchange Resin in

The leaching of copper using thiosulfate reagent as an alternative reagent to cyanide has been investigated Hence limiting the presence of oxygen and ammonia in the leach solution would be worthy to investigate the adsorption of copper complexes on

may contain 0 5-0 7% copper and is frequently used as construction material or for sandblasting Leaching processes produce residues while effluent treatment results in sludges which can be sent for metals recovery The smelting process typically produces less than three tons of solid waste per ton of copper produced Pollution Prevention and

The leaching speed of copper in an ammonia solution containing ammonium chloride was higher than that in an ammonia solution containing ammonium sulfate Key words Copper Dissolution Ammonia Solution Waste Leaching Hydrometallurgical Process 1 Introduction The metals recovery from waste materials is important for

Ammonia is alkaline and corrosive It reacts strongly with oxidisers acids halogens and attacks copper aluminium silver zinc and their alloys It is corrosive to copper Liquid ammonia will attack some forms of plastics rubbers and coatings It is very soluble in water chloroform and ether and is moderately soluble in alcohol

The technology of using sulphuric acid to leach non-ferrous metals from ores has been around for over 50 years Copper and nickel are the major metals using acid leaching Heap leaching is the predominant technology for copper recovery High pressure acid leach (HPAL) is the predominant system used for nickel leaching Get Price