The Hunt method-calls for the direct treatment of the ore with a solution of potassium cyanide to which ammonium hydroxide has been added. The gold is thus extracted together with some copper, and the metals are recovered by electrolytic precipitation, the gold, silver and copper falling to the bottom of the vats as a sludge.
copper gold ore treatment
Typical Smelter Treatment Charges: SCHEDULE: COPPER SMELTER: LEADS SMELTER: ZINC SMELTER: CRUDE LEAD-ZINC MILLING ORE: TREATMENT CHARGE: $ 12.50 per dry ton: $ 12.50 per dry ton on lead content 25% wet assay plus 10c per ton for each unit under 25%. $ 51.50 per dry ton based on 12c market price. Add $1.25 per net ton for each 1c or fraction ...
TREATMENT OF A COPPER. TREATMENT OF A COPPER- RICH GOLD ORE BY AMMONIA ASSISTED CYANIDE LEACHING Figure 4 Effect of Pb(NO 3) 2 on the extraction of gold (NaCN: 15 g/L) The pretreatment of the ore by ammonia (1 M) was therefore, investigatedin an attempt to remove easily solubilised copper,...
Demonstration of economic treatment options allows gold companies to maintain and increase their ore reserves. Refractory gold ores are those that do not yield high gold recoveries in conventional cyanide-leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be either
The practice of gold minerals beneficiation is optimized by using the information obtained from applied mineralogy. In this way, at the moment of development and select a process for treatment a gold ore, try to identify the gold minerals is the first step. Obviously, the detection of non-valuable minerals is …
Dry ore is the term often used. The second class of gold ores is auriferous copper ores. These are widely distributed throughout the United States and much of the chalcopyrite is gold bearing. These auriferous copper ores are especially abundant in Colorado, Utah, Montana and British Columbia.
Once the ores are fully roasted, and the sulfur is driven off, the extraction of the gold or silver from the ore is not especially difficult. Treatment of the roasted ores was done by normal methods such as amalgamation or cyanide treatment.
The unpurified gold ore is fashioned into a 100-ounce anode, whereas pure gold strips make up the cathode. The electrolyte solution is a mix of gold chloride and hydrochloric acid. When an electric current passes from the anode to the cathode through the electrolyte, the gold at the anode dissolves and collects at the cathode.
Many reports have been published on the effect of ammonia with cyanide for the treatment of copper–gold ores, with a recent review published by Muir (2011). The addition of ammonia to the cyanide solution (with lower cyanide addition) results in a lower cyanide consumption and an increased selectivity of gold leaching over copper.
2, 3 Poor cyanidation results are often obtained when sulfide minerals are present in gold ores. 4 Common sulfide minerals associated with gold ores are pyrite, pyrrhotite, marcasite, copper ...
The value of the free copper, gold and silver in a copper concentrates for a copper smelter is depending on the recovery rate, LME copper price and LMBA gold and silver price. In this example the recovery rate for a copper smelter is 98.0%. The value of free gold and silver is normally greater than the value of the free metal for copper.
Iron oxide copper gold ore deposits (IOCG) are important and highly valuable concentrations of copper, gold and uranium ores hosted within iron oxide dominant gangue assemblages which share a common genetic origin. These ore bodies range from around 10 million tonnes of contained ore, to 4,000 million tonnes or more, and have a grade of between 0.2% and 5% copper, with gold contents ranging ...
The average grade of copper ores in the 21st century is below 0.6% copper, with a proportion of economic ore minerals (including copper) being less than 2% of the total volume of the ore rock. A key objective in the metallurgical treatment of any ore is the separation of ore minerals from gangue minerals within the rock.
Pre-treatment of a Copper-rich Gold Ore for Elimination of Copper Interference Conference Paper (PDF Available) · June 2015 with 3,320 Reads How we measure 'reads'
Copper minerals present difficulties during the cyanide leaching of gold ores leading to excessively high consumption of cyanide (and oxygen) coupled with low extraction of gold. Copper cyanide species, if present at high levels, adversely affects
The application 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 …
Gold bearing ores that include base-metal mineralization, particularly copper, are classified as complex ores. These ores will often consume cyanide and create issues in CIP and elution. Preg-robbing carbon is defined as the phenomenon whereby the gold cyanide complex is removed from solution by constituents of the ore (Rees & van Deventer, 2000).
Water Treatment; Froth Flotation (Sulphide & Oxide) ... Copper/gold mine. Flotation help with oxidized ore. (3 replies and 1 comment) B. ... The addition of 6494 depends on the content of copper oxide ore. The pH should not be more than 10. The addition of soda ash could be useful to regulate the pH.
Copper–gold ores form a type of refractory gold ore. Large quantities of this ore type are available for processing. Cyanide treatment of ores with a high cyanide soluble copper to gold ratio is unfavourable due to high cyanide consumption resulting from the formation of copper–cyanide complexes.
Feb 15, 2020· There is no one universal way of treating sulfide rich precious metal ores - in the mineral kingdom there are all sorts of complex minerals which contain, in addition to gold or silver, complex combinations of lead, zinc, copper, iron, nickel, manganese, palladium, …
Copper-gold ore treatment options and status. Author La Brooy, S.R. Randol Gold Forum, Vancouver 1992, Randol International, Golden Colorado, USA, pp. 173-177. Contact us for a …
The gold extraction from leaching gold-copper oxides ore, containing 12.9 ppm gold and 0.04% copper, has been studied. The copper in such ore is present at nuisance levels, meaning that copper presence adds additional cost for treatment without bringing any additional revenue.
Keywords: ammoniacal cyanide leaching, pre-treatment, lead nitrate, copper-gold ore, gold . INTRODUCTION . Cyanidation process is extensively usedfor leaching of gold from ores since cyanide forms strong complexes with gold. In this process, some impurities such as copper and arsenic problems are present (Hayes and Corrans, 1992; Bas . et al
The high copper grade in the Igarapé Bahia (Brazil) gold-copper ore restricts the direct application of the classical cyanidation process. Copper oxide and sulfide minerals react with cyanides in solution, causing high leach-reagent consumption, raising processing costs and decreasing gold recovery.
The application of ammonium thiosulfate for the treatment of copper–gold ores has been investigated. Copper minerals and copper–gold samples were leached in an ammonium thiosulfate solution under varying experimental conditions, i.e. aeration, temperature and reagent addition.
Copper-gold-pyrite ore types with an elevated pyrite head grade utilise a sequential flotation circuit to recover initially a copper-gold concentrate with a pyrite-gold concentrate being produced from the tailing of the initial circuit. A simpler flotation circuit with lower operating and capital costs for treatment of such copper-gold-pyrite ...
Cyanide consumption can result in the ore being uneconomic to treat by conventional means. Loading of copper onto carbon can also have deleterious effects on gold recovery and subsequent stripping and bullion recovery. The recovery of gold from high copper ores has been previously reviewed by Muir, LaBrooy and Cao (1989).
The treatment of a copper sulphide-bearing gold ore by direct cyanide leaching, ammonia pretreatment and ammoniacal cyanide leaching was investigated.
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