chemistry the chemistry of pper heap leaching

Heap Leaching - an overview ScienceDirect Topics

2.1 Leaching. 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.

Improvements in Copper heap leaching by use of wetting

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.

STUDIES ON THE CURING AND LEACHING KINETICS OF

Table 2.3 Copper oxide leaching reactions (Watlin 2006) ..... 14 Table 2.4 Copper sulfide leaching reactions (Watlin 2006) ..... 14 Table 2.5 Important gangue leaching reactions in copper heap leaching (Jansen and

Dump and Heap Leaching - HydroJex

Leach Chemistry. Leach chemistry factors and issues th at must be considered for successful heap leaching of gold and copper are provided in the chapters on gold, silver, and copper hydrometallurgy elsewhere in this handbook. Other metals of interest in heap or dump leaching include uranium, nickel, cobalt, zinc, and recently, some rare earth

Leaching copper from its ores Journal of Chemical Education

Analysis of Copper-Bearing Rocks and Minerals for Their Metal Content Using Visible Spectroscopy: A First Year Chemistry Laboratory Exploration. Journal of Chemical Education 2016, 93 (9) , 1616-1622. DOI: 10.1021/acs.jchemed.6b00235.

Leaching of Copper Sulphides - SAIMM

POX in a copper heap leach circuit. Figure 2. Simplified ferric leaching flowsheet. Figure 3. Copper chloride leach process. Leaching Chemistry As outlined earlier, the leaching chemistry that takes place within a total POX autoclave is very complex and will vary from case to case according to the mineralogy of the concentrate fed to the

(PDF) Heap Leaching: Practice and Fundamentals

Nov 26, 2004  Solution chemistry • Porous cups ... The conclusions reached in the paper are supported by observed responses from operating heap leach systems for copper, silver, and gold. Read more. Article.

STUDIES ON THE CURING AND LEACHING KINETICS OF

Table 2.3 Copper oxide leaching reactions (Watlin 2006) ..... 14 Table 2.4 Copper sulfide leaching reactions (Watlin 2006) ..... 14 Table 2.5 Important gangue leaching reactions in copper heap leaching (Jansen and

Acid leaching of copper ore heap with fluoroaliphatic ...

"Copper," Kirk-Othmer, Encyclopedia of Chemical Technology, vol. 6, pp. 819-820 (3rd ed., John Wiley and Sons, 1979. (UNKNOWN) "Effect of Nonionic Surfactants on Chalcopyrite Leaching Under Dump Chemical Conditions", U.S. Department of the Interior, Bureau of Mines, Report of Investigations 9311 (1990).

US20160258036A1 - Heap Leaching of Copper - Google Patents

A method of leaching copper from a heap of ore that includes at least one resting step followed by an irrigation step, wherein, during the irrigation step a leach solution that contains chloride ions is applied to the ore at a higher rate than during the resting step.

Dump and Heap Leaching - HydroJex

Leach Chemistry. Leach chemistry factors and issues th at must be considered for successful heap leaching of gold and copper are provided in the chapters on gold, silver, and copper hydrometallurgy elsewhere in this handbook. Other metals of interest in heap or dump leaching include uranium, nickel, cobalt, zinc, and recently, some rare earth

(PDF) Copper leaching from primary sulfides: Options for ...

ZnS þ 0:5O2 þ H2 SO4 →ZnSO4 þ S þ H2 O 423 424 407 The chemistry of the leaching processes can be 408 summarized according to the various steps in the Fe7 S8 þ 3:5O2 þ 7H2 SO4 →7FeSO4 þ 8S þ 7H2 O ED Feed Slurry Combined Raffinate Vent Oxygen or Air Copper Leach Leach Discharge Primary Chalcopyrite Leaching CT Flash Steam Flash ...

(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.

Minerals Special Issue : Heap Leaching: The State-of-the-Art

Minerals, an international, peer-reviewed Open Access journal. Dear Colleagues, Economically-significant quantities of gold, silver, copper, and uranium are currently extracted using heap leaching technology, and the technology is being explored also for nickel, zinc, PGMs, rare earths, as well as electronic circuit boards and nitrate minerals.

(PDF) Heap Leaching: Practice and Fundamentals

Nov 26, 2004  Solution chemistry • Porous cups ... The conclusions reached in the paper are supported by observed responses from operating heap leach systems for copper, silver, and gold. Read more. Article.

Leach Solution - an overview ScienceDirect Topics

For example, for low-grade copper oxide ores, conventional heap acid leaching may suffice. However, for lower grade secondary copper sulfides, heap bioleaching is the most likely process route. In recent years, heap bioleach processes are being developed to treat primary copper sulfides such as refractory chalcopyrite.

Optimization of parameters affecting recovery of copper ...

heap leaching and reservoir engineering aspects studied are summarized in Tables 3 and 4. Table 2. Names of world's major mines producing copper through mass bioleaching [12]. Heap bioleaching of copper ores (historical and current) Cu production (t/year) Region/mine Operation reserves (t) Ore processed (t/day) 14-15×103 Oxides/chalcocite

(PDF) Cyanide Leaching of Copper-Gold-Silver Ores

A tra de-off study of heap acid leaching versus heap cya nidation leaching for copper-gold-silver ores was conducted at a scoping level. The main concl usions are the following:

Optimization of the Heap Leaching Process through Changes ...

Once the process workflow of heap leaching has been characterized, it is possible to model the heap leach stage sequentially with the Arena simulation software. The update of copper recovery over time is simulated by parametrizing the analytical models retrieved from the literature, and incorporating them into the Arena simulation [ 23 ].

Heap Leaching - Mineral Processing Metallurgy

Metallurgical ContentHeap Leaching Copper OresIngress of Solutions into OresSurface TensionSolubility of Gas in VoidsTemperatureVarious SolutionsManner of PenetrationDissolution of Various Copper MineralsLeaching Oxidized MineralsCuprite LeachingLeaching ChalcociteBornite LeachingCovellite LeachingChalcopyrite LeachingRemoval of Soluble Copper from Leached OresConclusionsHEAP LEACHING ...

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

Aug 04, 2016  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.

Acid leaching of copper ore heap with fluoroaliphatic ...

"Copper," Kirk-Othmer, Encyclopedia of Chemical Technology, vol. 6, pp. 819-820 (3rd ed., John Wiley and Sons, 1979. (UNKNOWN) "Effect of Nonionic Surfactants on Chalcopyrite Leaching Under Dump Chemical Conditions", U.S. Department of the Interior, Bureau of Mines, Report of

Leaching copper from its ores Journal of Chemical Education

Analysis of Copper-Bearing Rocks and Minerals for Their Metal Content Using Visible Spectroscopy: A First Year Chemistry Laboratory Exploration. Journal of Chemical Education 2016, 93 (9) , 1616-1622. DOI: 10.1021/acs.jchemed.6b00235.

Acid-Gangue Interactions in Heap Leach Operations: A ...

Heap leaching accounts for a fifth of global copper production, sourced primarily from porphyry ores, yet metal recoveries are often not optimal. Gangue, and its interaction with acid, plays an important role in such processes. Thus, a proper understanding of gangue minerals present in the ore, their textural relationships relative to particle size distribution, reactivity with acid under ...

Minerals Special Issue : Heap Leaching: The State-of-the-Art

Minerals, an international, peer-reviewed Open Access journal. Dear Colleagues, Economically-significant quantities of gold, silver, copper, and uranium are currently extracted using heap leaching technology, and the technology is being explored also for nickel, zinc, PGMs, rare earths, as well as electronic circuit boards and nitrate minerals.

Leaching of Copper Sulphides - SAIMM

POX in a copper heap leach circuit. Figure 2. Simplified ferric leaching flowsheet. Figure 3. Copper chloride leach process. Leaching Chemistry As outlined earlier, the leaching chemistry that takes place within a total POX autoclave is very complex and will vary from case to case according to the mineralogy of the concentrate fed to the

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 irrigated with a leach solution to melt the valuable metals.

Optimization of parameters affecting recovery of copper ...

heap leaching and reservoir engineering aspects studied are summarized in Tables 3 and 4. Table 2. Names of world's major mines producing copper through mass bioleaching [12]. Heap bioleaching of copper ores (historical and current) Cu production (t/year) Region/mine Operation reserves (t) Ore processed (t/day) 14-15×103 Oxides/chalcocite

(PDF) Cyanide Leaching of Copper-Gold-Silver Ores

A tra de-off study of heap acid leaching versus heap cya nidation leaching for copper-gold-silver ores was conducted at a scoping level. The main concl usions are the following:

(PDF) On the optimization of heap leaching Luis ...

Results the restrictions of the SX plant do not have a direct effect on the kinetics of the leaching, although they do have Many of the commercial simulation models (Quast, effects on the economic aspect as observed in Fig. 3, where 2000; Bartlett, 1992) of heap leaching consider the restric- it is seen that the optimum economic conditions are ...

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

Aug 20, 2015  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 ...

EXTRACTION AND ECONOMIC UTILIZATION OF COPPER

2.2.2 Dump and Heap Leaching 21 2.2.3 Pressure Leaching 22 ... roasting with and without oxidants/ additives prior to leaching. The chemical analyses have shown that on an average these ore samples contained 20 percent Copper, 2.01 ... to increase copper leaching was also investigated during roasting of sulfide ores sample

Copper recovery using leach/solvent extraction ...

leaching of high-grade copper oxide ore followed by EW of copper from the leach solution, produced low quality copper cathode at relatively high cost. In 1968 the tonnage of high-grade oxide ores was decreasing and vat leaching was on the decline. The second process, heap and dump leaching of low-

US8070851B2 - Chloride heap leaching - Google Patents

A heap leaching method to recover copper from a primary copper sulphide mineral wherein the mineral is leached in an acidic chloride/sulphate solution in the presence of oxygen with the surface potential of the mineral below 600 mV (vs. SHE) to cause dissolution of the copper sulphide.

Studies on the curing and leaching kinetics of mixed ...

Heap leaching is a metal extraction process from low grade ores where crushed ore is stacked on an impermeable pad and irrigated from the top with a solution of chemical reagents. An enriched solution containing the targeted metal is collected at the bottom. This technique involves complex chemical/electrochemical reactions and transport processes. Among the main features of this method