our products

D&Q Mining is a high-tech company integrating R&D, production and sales. It provides mature products and solutions such as crushers, sand making, milling equipment, mobile crushing stations, etc., for aggregate, mining and waste recycling.

heap leaching copper ores

Heap leaching - Wikipedia

The mined ore is usually crushed into small chunks and heaped on an impermeable plastic or clay lined leach pad where it can be irrigated with a leach solution to dissolve the valuable metals. While sprinklers are occasionally used for irrigation, more often operations use drip irrigation to minimize evaporation, provide more uniform distribution of the leach solution, and avoid damaging the exposed mineral. The solution then percolates through the heap and leaches both the target and other minerals. This process, called the "leach cycle," generally takes from one or two months for simple oxide ores (e.g. mo

More

Heap Leaching - an overview ScienceDirect Topics

Most copper leaching is done by piling broken ore (∼0.5% Cu) into flat-surface, 3–10m high, 10 4 –10 5 m 2 heaps of ore and then sprinkling dilute sulfuric acid lixiviant on to the heap surface. The lixiviant trickles down through the heap and leaches copper from its minerals to produce a pregnant leach solution containing 1–5kg Cum −3.

More

Heap Leaching Mining Techniques, Metals Mining, Copper ...

Heap leaching is an industrial mining method to dig out precious metals and copper compounds from ore. Process of heap leaching The mined ore is crushed into tiny chunks and heaped on an impermeable plastic and/or clay lined leach pad where it may be

More

Dump and Heap Leaching - HydroJex

Dump leaching has mostly been applied to gold, silver, and copper ores, whereas heap leaching has been applied to many different minerals including copper, gold, silver, ura- nium, vanadium, zinc, nickel, and cobalt. However, as the principal applications are copper and precious metals, most of the following discussion will refer to these metals.

More

(PDF) THE ART OF HEAP LEACHING Lee JOHN - Academia.edu

Typical GAC for a copper heap leach is 10 to 40 kg/t H2SO4 acid and GLC for a gold heap leach is 0.3 to 1 kg/t NaCN. Ultimate GAC of a base metal ore often increases with leach time and with poor percolation. It is thus imperative to achieve maximum permeability to avoid severe pH differentials through the lift. 2.2.4.

More

Copper heap leach development – not as easy as it looks ...

2016-08-04  Heap leaching has become increasingly popular in the copper industry for treating oxide and secondary sulphide ores, and is now being extended to primary sulphide ores. The ability to use heap ...

More

Heap Leach: Mining's breakthrough technology -

2015-08-20  Copper Heap Leaching (Solvent Extraction-Electrowinning – SX-EW) In 2014, more than 50 major HL-SX-EW operations worldwide recovered approx. 3 million tonnes of copper, which represents roughly ...

More

Agglomeration technique improves heap leaching

Heap leaching relies on a leaching agent moving through a bed of heaped ore to extract the metallic components: Crushed ore is stacked on a leaching pad and irrigated with the leaching agent. The leaching agent chemically reacts with the metal in the ore to dissolve the copper into the solution as it percolates through the heap.

More

(PDF) THE ART OF HEAP LEACHING Lee JOHN - Academia.edu

The heap leaching of nickel laterites is problematic in that the GAC is around 500 kg/t and this has also restricted the commercialisation of nickel heap leaching. Typical GAC for a copper heap leach is 10 to 40 kg/t H2SO4 acid and GLC for a gold heap leach is 0.3 to 1 kg/t NaCN.

More

HEAP LEACHING OF AFRICAN COPPER-COBALT ORES

HEAP LEACHING OF AFRICAN COPPER-COBALT ORES Lewis G., Bastin D., Alvayai C. Frenay J. University of Liege, Chemin des Chevreuils B52/-l, 4000 Liege, Belgium E-mail: [email protected] ABSTRACT 115 Heap leaching is now largely applied to recover copper from oxidized ores. However it is not yet applied in central Africa. Laboratory tests have been carried out in order to study the

More

Copper heap leach development – not as easy as it looks ...

2016-08-04  Leachable copper is the true head grade for heap leaching, and the orebody should be modelled accordingly. Select the appropriate leachable copper assay procedure. Better to

More

Heap Leach: Mining's breakthrough technology - MINING.COM

2015-08-20  Heap leaching (HL) is a flexible and constantly developing mineral processing and extraction technology that is gaining popularity and recognition for

More

Heap Leaching: Is it something that could be an ...

2019-11-29  Heap leaching is an industrial mining process used to extract precious metals, copper, uranium, and other compounds from ore using a series of chemical reactions that absorb specific minerals and re-separate them after their division from other earth materials.

More

A BACTERIAL HEAP LEACHING APPROACH FOR THE TREATMENT

recovery for Cu ores. Heap leaching is currently employed for copper oxides and secondary sulphides, e.g. Quebrada Blanca (Chile)(2) ... The above approach has been applied to the leaching of copper oxide ores and to a lesser extent secondary copper sulphide ores, where leaching can be carried out at ambient temperatures. The microbially assisted generation of ferric iron, at typical mine ...

More

Heap leaching Process, Environmental Concerns, Examples ...

Heap leaching is an industrial mining process used to extract precious metals, copper, uranium, and other compounds from ore using a series of chemical reactions that absorb specific minerals and re-separate them after their division from other earth materials.

More

Precious Metal Heap Leach Design and Practice - Ore-Max

Heap leaching of gold and silver ores is conducted at approximately 120 mines worldwide. Heap leaching is one of several alternative process methods for treating precious metal ores, and is selected primarily to take advantage of its low capital cost relative to other methods. Thirty-seven different heap leach operations with a total production of 198 tonnes of gold per year (6,150,000 ounces ...

More

Agglomeration technique improves heap leaching process ...

Heap leaching relies on a leaching agent moving through a bed of heaped ore to extract the metallic components: Crushed ore is stacked on a leaching pad and irrigated with the leaching agent. The leaching agent chemically reacts with the metal in the ore to dissolve the copper into the solution as it percolates through the heap.

More

Evaluation of stucco binder for agglomeration in the heap ...

2011-07-01  Although the cement has been used in precious metal ore agglomeration (gold ores) for heap leaching from the 1980s, very few, if any, copper heap leaching operations add any binder to the sulfuric acid solution, possibly because of the binder cost, large consumption and curing issues, and limited selection of acid tolerant and microbial resistant binders (McClelland, 1988, Bouffard, 2005).

More

Heap leaching of copper ores opportunity through science

Heap leaching of copper ores – opportunity through science Jochen Petersen. 2 A typical heap leach operation. Heap leach process ? What is going on inside a heap. Grain/Surface Scale Particle Scale Agglomerate Scale Heap Scale What is going on inside a heap. 6 Solution flow downwards Heat generation through reaction Gas (humid air) transport up Surface evaporation and radiation The heap ...

More

Investigation into the heap leaching of copper ore from ...

2009-08-01  Heap leaching is applied worldwide to extract copper from low grade oxide and sulphide ores and from different plant residues (McMahon, 1964, Dopson et al., 2009, Bingöl et al., 2005, Rich, 2008, Helle et al., 2005, Bouffard, 2008, Quast, 2000). The technique is currently being developed at the Disele mine in Kakanda, South East of the Democratic Republic of the Congo, where it is applied to ...

More

Heap leaching of copper from the ores of Volkovskoe ...

Heap leaching of oxidized, complex, and waste copper ores of the Volkovskoe deposit is considered. Based on the results of an investigation, the preliminary granulation of milled ore with sulfuric acid (25–75 kg/t ore) is recommended. Introduction of this procedure leads to a decrease in the leaching time by 15–30% and allows one to obtain solutions more concentrated by copper.

More

A BACTERIAL HEAP LEACHING APPROACH FOR THE TREATMENT

recovery for Cu ores. Heap leaching is currently employed for copper oxides and secondary sulphides, e.g. Quebrada Blanca (Chile)(2) ... The above approach has been applied to the leaching of copper oxide ores and to a lesser extent secondary copper sulphide ores, where leaching can be carried out at ambient temperatures. The microbially assisted generation of ferric iron, at typical mine ...

More

Pretreatment of copper ore prior to heap leaching ...

Pretreatment of copper ore prior to heap leaching: Date: 2010: Description: Pretreatment of copper ore prior to heap leaching includes crushing and agglomeration processes which were studied in this thesis research. Crushing is a high energy consuming process. In mining operations generally jaw and gyratory crushers are used for primary crushing and cone crushers are used for secondary ...

More

Copper heap leach development – not as easy as it looks ...

2016-08-04  Heap leaching has become increasingly popular in the copper industry for treating oxide and secondary sulphide ores, and is now being extended to primary sulphide ores. The ability to use heap ...

More

Acid leaching of copper ore heap with fluoroaliphatic ...

Briefly, the present invention provides, in one aspect, an improved method for aqueous acid leaching of copper values from a heap of low grade copper oxide ore, comprising: contacting, for example by spraying, with dilute aqueous sulfuric acid a heap of low-grade copper oxide ore (which is optionally pretreated with strong aqueous sulfuric acid) and allowing said aqueous acid to trickle, or ...

More

HEAP LEACHING TECHNIQUE in MINING

Heap leaching is BAT for suitable ores because it allows the economical processing of ore that would otherwise be uneconomic under con ditions that can technically achieve regulatory acceptable levels of environmental risk mitigation. All of the materials used in heap leaching process and industry specifications of materials are available globally. Also, slope stability evaluations of stacked ...

More

What is Heap Leaching? (with picture)

2021-02-17  The heap leaching process is used to extract metals such as gold, copper, and nickel and may be used on low grade ores and mining tailings which are generally considered to be of no commercial value. The process also produces yellowcake, a concentrate leached from uranium ore used in the production of nuclear reactor fuel.

More

Precious Metal Heap Leach Design and Practice - Ore-Max

Heap leaching of gold and silver ores is conducted at approximately 120 mines worldwide. Heap leaching is one of several alternative process methods for treating precious metal ores, and is selected primarily to take advantage of its low capital cost relative to other methods. Thirty-seven different heap leach operations with a total production of 198 tonnes of gold per year (6,150,000 ounces ...

More

Heap leaching of copper ores opportunity through science

Heap leaching of copper ores – opportunity through science Jochen Petersen. 2 A typical heap leach operation. Heap leach process ? What is going on inside a heap. Grain/Surface Scale Particle Scale Agglomerate Scale Heap Scale What is going on inside a heap. 6 Solution flow downwards Heat generation through reaction Gas (humid air) transport up Surface evaporation and radiation The heap ...

More

Improvements in Copper heap leaching by use of wetting agents

Heap leaching belongs to the group of percolation leaching processes and operates over ground. The procedure is illustrated in Figure 1.The oxide copper ore is piled up on leach pads, which have a slight slope of approx. 3° and a rubber lining, which seals the ground under the heap.

More

A BACTERIAL HEAP LEACHING APPROACH FOR THE TREATMENT

Copper is primarily produced by smelting and refining (80% of worldwide production), followed by oxide heap leaching (13%), secondary copper sulphide heap leaching (5%), and other hydrometallurgical routes such as concentrate pressure leaching and bacterial leaching.

More

Heap leaching of copper from the ores of Volkovskoe ...

Heap leaching of oxidized, complex, and waste copper ores of the Volkovskoe deposit is considered. Based on the results of an investigation, the preliminary granulation of milled ore with sulfuric acid (25–75 kg/t ore) is recommended. Introduction of this procedure leads to a decrease in the leaching time by 15–30% and allows one to obtain solutions more concentrated by copper.

More

Advances in high-temperature heap leaching of refractory ...

The heap leaching of copper ores is an example of such a trend, where heap leaching was initially applied only to the acid leaching of oxide ores. The most important factors to be considered in oxide heap leaching are the copper dissolution, acid consumption, and gangue chemistry. The rate at which acid can be supplied to the heap is constrained by the increase in undesirable gangue reactions ...

More

Pretreatment of copper ore prior to heap leaching ...

Pretreatment of copper ore prior to heap leaching: Date: 2010: Description: Pretreatment of copper ore prior to heap leaching includes crushing and agglomeration processes which were studied in this thesis research. Crushing is a high energy consuming process. In mining operations generally jaw and gyratory crushers are used for primary crushing and cone crushers are used for secondary ...

More

Innovations in Copper: Mining Extraction: Producing ...

The GEOCOAT™ Process - A heap leaching process that is capable of bioleaching copper concentrates. It does this by coating the concentrate slurry onto a support rock, or substrate material, and stacking this coated material in a bioxidation heap. The support rock itself may be a low-grade copper ore.

More

What is Heap Leaching? (with picture)

2021-02-17  The heap leaching process is used to extract metals such as gold, copper, and nickel and may be used on low grade ores and mining tailings which are generally considered to be of no commercial value. The process also produces yellowcake, a concentrate leached from uranium ore used in the production of nuclear reactor fuel.

More

Precious Metal Heap Leach Design and Practice - Ore-Max

CHEMISTRY OF GOLD/SILVER HEAP LEACHING The chemistry of leaching gold and silver from their ores is essentially the same for both metals. A dilute alkaline solution of sodium cyanide dissolves these metals without dissolving many other ore components (copper, zinc, mercury and iron are the most common soluble impurities).

More

LixTra - BASF

LixTRA™ Copper Leach Technology now offers the industry its first leaching additive that is compatible with the entire Leach à SX EW process. History Heap leaching copper from oxide and secondary sulfide ores has been practiced commercially since the late 1960’s. This methodology is mostly used for low-grade ores and involves

More