Gangues and Clays Minerals as Rate-Limiting Factors in …
Acid curing is performed before heap leaching to accelerate the reaction with copper ores through concentrated H 2 SO 4. However, a critical consequence for …
Copper Mineral Leaching Mathematical Models—A …
Leaching processes can be defined as the selective removal and/or extraction of metallic values from a mineral, causing a suitable solvent of the leaching agent to percolate into and through a mass of heap or mineral containing the metallic values [1]. Leaching is of great importance in the field of metallurgy since it is frequently used in the ...
Ore agglomeration behavior and its key controlling factors in …
The particle segregation, stratification, excessive feed size of non-agglomerated heaps chronically leads to poor heap permeability and leaching efficiency.
Review of gold leaching in thiosulfate-based solutions
TERARAKELYAN et al [28] from Soviet Union reported that the presence of copper ions (Cu2+) can accelerate the dissolution of gold in thiosulfate solutions [28]. In 1994, Newmont Gold Corporation published a patent on the use of copperâˆ'ammoniaâˆ'thiosulfate solution for heap leaching of pre-robbing …
Copper Mineral Leaching Mathematical Models—A Review
Leaching processes can be defined as the selective removal and/or extraction of metallic values from a mineral, causing a suitable solvent of the leaching agent to percolate into and through a mass of heap or mineral containing the metallic values [ 1 ]. Leaching is of great importance in the field of metallurgy since it is …
metals Pretreatment of Copper Sulphide Ores …
leaching of a copper sulphide ore. here, a copper sulphide was used, which contained 1.21% chalcopyrite and 0.54% bornite—these being the minerals with the highest contribution of copper .
Study of Factors Affecting the Copper Ore Leaching Process …
The composition of copper ore samples was analyzed with the use of fluorescence and chemical methods. Table 1 shows the content of the main valuable component—copper—as well as metals with the highest content that affect the leaching process. Table 1. Amount of copper and other metals in copper ore samples (%).
Bioleaching and Biomining | SpringerLink
Dump leaching was popularly used for the extraction of copper sulfide ores (Brierley 2008). 13.4.3 Heap Leaching. Heap bioleaching is a speedily rising method for the extraction of base metals from sulfide minerals. Bioheaps are a big amount of low-grade ores and effluents from extraction strategies that include trace quantities of minerals.
Gangues and Clays Minerals as Rate-Limiting …
In heap leaching, the crushed ore is stacked on an impermeable pad, and leaching reagents (a strong acid, commonly sulfuric acid for copper or nickel ores or a dilute cyanide solution for gold and …
23.3: Hydrometallurgy
If there are no other economic elements within the ore a mine might choose to extract the uranium using a leaching agent, usually a low molar sulfuric acid. Similar to copper oxide heap leaching, also using dilute sulfuric acid. The final product is yellowcake ((U_3O_8)) and requires significant further processing to produce fuel-grade feed.
Flow through porous media with applications to heap leaching of copper ores
Conclusions. A mathematical model in Ω ⊂ ℜ 2 was developed for the heap leaching process of copper ores which considers simultaneously a two phase flow (leach solution and gas) and transport of two components by the fluid phase (leach solution), i.e., sulfuric acid and copper, for the production of copper. Our model generalizes previous ...
Copper heap leaching: Process, principles and practical …
Low-grade ores are treated by dump leaching, while vat leaching can be used to treat higher grade oxide ore. Agitation leaching in stirred tanks is applied to both oxide and sulfide...
Heap bioleaching of chalcopyrite: A review
Cost of bio heap leachingCopper is recovered from the bio heap leach liquor by solvent-extraction and electrowinning to produce high-grade copper cathode. There are four major processing components (Fig. 1): • A crushing plant reduces ore size. • A heap-leach operation dissolves copper by using the chemical and bacteriological agents. •
(PDF) Leaching of Copper Sulphides
Atmospheric leaching of copper sulphides is carried out in challenging conditions of elevated. temperature, low pH and high chloride ion concentrations. In addition, the reacto rs need to ...
Minerals | Special Issue : Heap Leaching: The State-of-the …
Special Issue Information. 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. Design of heap leach operations, …
Study of Factors Affecting the Copper Ore …
It was established that during the leaching process, silicate compounds of alkaline earth metals, in addition to calcium and magnesium carbonate compounds, would affect the levels of sulfuric acid …
Leaching of chalcopyrite ore agglomerated with high …
One of the most important unresolved problems in the development of a heap leach process for copper sulfide ores is the inhibited leaching of chalcopyrite at ambient temperature. Numerous studies have reported the formation of a layer on the surface of chalcopyrite during the dissolution process; however, the nature of this …
Crushed ore agglomeration and its control for heap leach …
Abstract. Based on the extensive experience of heap leaching operations, crushed ore agglomeration can be successfully considered and utilized as a pretreatment step for the heap leaching of ores containing significant amounts of fines and clay minerals. The drum agglomeration is considered as a pretreatment step for the heap …
Ore permeability methods of evaluation and application to heap leach …
Copper heap leaching is a rate-dependent process sensitive to copper mineralogy (copper oxides > secondary sulfides > hypogene sulfides), driven by the pH of the leach solution, the activity of ...
Heap Leaching
Heap leaching of copper ores is widely practiced, particularly in North and South America, for the leaching of acid-soluble oxide minerals and secondary sulfides, such as …
In situ leaching of copper: Challenges and future prospects
1. Introduction. In situ leaching (ISL) is the circulation of a fluid through an ore deposit to dissolve a target metal or mineral, with subsequent return of the liquor to the surface for processing. In some cases, lixiviant is applied to formations using a system of injection and recovery wells (see Fig. 1 ).
Ore agglomeration behavior and its key controlling factors in heap …
In 1970s, to ameliorate the undesirable leaching condition and obtain better extraction efficiency, the agglomeration and its processing controls were firstly mentioned in Nevada of the United States (Johnson and Roberto, 1997; Potter, 1981).As Fig. 2 shows, the basic operating procedure of agglomerated heap could be described that: 1) the …
Optimal design and planning of heap leaching process.
The design and planning of heap leaching systems is a coupled problem. Padilla et al. ... This section illustrates the application of the model for the copper heap leaching process in systems of one, two and three heaps to analyze the effects of variables such as copper price, heap size, ore grade, acid price and variable cost on the process ...
Copper heap leach development – not as easy as it looks
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 start correctly than ...
Percolation leaching of clay mixed copper ores | Request …
Abstract. The present work addresses the problem of improving the percolation properties of heap leaching piles of clay, slime-oxidised and mixed ores. These ores are prone to colmatation, which ...
Copper Mining and Processing: Processing Copper Ores
The leaching reagent (dilute sulfuric acid) is sprayed through sprinklers on top of the heap pile and allowed to trickle down through the heap, where it dissolves the copper from the ore. The resulting "pregnant" leach solution of sulfuric acid and copper sulfate is collected in a small pool. The copper compound can now be seen at ...
Producing Copper Nature's Way: Bioleaching
Three of the processes introduced above have made great strides in solving these problems for the extraction of copper from chalcopyrite: 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 …