acid leaching dump

  • Home
  • acid leaching dump

Copper Dump Leaching and Management Practices That ...

Leaching of copper from massive dumps of sulfide ore is accomplished bacterial activity and, often, by the addition of sulfuric acid. Ferric sulfate, the major, lixiviant, forms in the presence of oxygen and bacterial activity. The bacteria generate acid in situ, which provides acid for acid-consuming reactions, including oxygen reduction.

Read More

US4039405A - Leaching copper ores and solvent extraction ...

This invention relates to a process whereby recovery of copper from copper ores using leaching and solvent extraction techniques can be increased. The process generally comprises leaching to obtain a pregnant leach liquor, washing ore residues with an extra quantity of water to obtain extra dissolved copper values, recovering said copper values, combining the extra wash water …

Read More

Innovations : Technology Changes Forge The Future Of ...

The leaching of the "oxide" materials is relatively easy and relies on dump, vat and agitation leaching using dilute sulfuric acid solutions. Leaching sulphide materials, whether in ore or concentrate, requires a chemical oxidizing agent – ferric ions (Fe3+). These special ferric ions can be generated by reactions with air.

Read More

Dump leaching - Big Chemical Encyclopedia

Dump leaching The foHowing factors are important in dump leaching (/) the role of bacteria (2) the appHcation of acid to prevent or delay precipitation of hydrated ferric sulfate (J) oxidation to remove excess iron from mine water in settling pools, as shown in equations 38 and 39 (4) optimization of dump configuration for good solution distribution and (5) avaHabHity of oxygen.

Read More

CN101768665A - Method for reducing acid consumption during ...

The invention discloses a method for reducing acid consumption during heap leaching and high-pressure leaching of nickel laterite ore, which combines the heap leaching technology with the high-pressure leaching technology to reduce acid consumption during the treatment of nickel laterite ore; residual sulfuric acid in coarse particle immersion of limonite heap is sufficiently …

Read More

Acid-leaching - Big Chemical Encyclopedia

Acid-leaching Nickel and Cobalt. Often present with copper in sulfuric acid leach Hquors are nickel [] and cobalt []. Extraction using an organophosphoric acid such as D2EHPA at a moderate (3 to 4) pH can readily take out the nickel and cobalt together, leaving the copper in the aqueous phase, but the cobalt—nickel separation is more difficult (274).

Read More

Toxic Treasure at the Agbogbloshie Dump in Ghana - The ...

In the Agbogbloshie dump in Ghana, workers strip electronic cables in order to uncover "gold, silver, copper and other valuable metals.". Workers resort to "acid leaching and cable burning" to more easily and economically strip cables, but these practices release harmful chemicals and byproducts that impact the health of people and the ...

Read More

US3809549A - Acid leaching of lateritic ore - Google Patents

nickel values are acid leached from nickeliferous oxide orres by forming an aqueous slurry of ore and pyrites in an autoclave and oxidizing the pyrites at a temperature between about 200*c. and 260*c. to provide a sulfuric acid solution for selectively leaching the nickel values contained in the nickeliferous oxide ore without encountering undue scale formation on the autoclave walls …

Read More

Situ Leaching - an overview | ScienceDirect Topics

Dump Leaching. Dump leaching was initiated during the late 1960s. One of the well-known dump leaching operations is located in Bingham Canyon, Utah (The United States) of the Kennecott Copper mines. The largest of the dumps at this site contained about 4 billion tons of low-grade copper ore.

Read More

LEACHING OF LOW-GRADE COPPER ORES: A CASE STUDY …

minerals). The leaching experiments were performed using sulphuric acid solutions, whereby the kinetics of copper leaching was investigated with respect to acid concentration and solid to liquid ratio. The copper concentration in the leach solution ranged from 0.80 to 1.75 g dm-3. The total Cu recovery rate ranged from 30 to 56 %, whereas the

Read More

XA04N0873 - OSTI.GOV

Heap leaching is used principally for dilute sulfuric acid leaching of copper from uncrushed porous, oxidized ore that has been piled on prepared drainage pads. The leach cycle duration is in months. Dump leaching is used to extract copper from low tenor uncrushed strip waste material that must be moved during mining. Both oxide and sulfide ...

Read More

Use of Thiourea Leaching During Gold-Containing Dump ...

Results of sample analysis after leaching shoed that acid treatment is adequate during an hour in order achieve the maximum extraction of valuable component at the level of 80%, which corresponds to data presented in Fig. 1. It should be noted that the residual amount original thiourea increased from 7–10 to 18–20%.

Read More

dump leaching_dump leaching - iChaCha

dump leaching,dump leaching,dump leaching,dump leaching,dump leaching,dump leaching in Chinese,dump leaching,dump leaching,,,,。

Read More

(PDF) A comparison of uranium recovery from low-grade ore ...

The low-grade uranium ore used in the experiments was collected from Radoniow's 'small' dump, Poland. Bioleaching and acid leaching studies were carried out in identical columns. The isolated ...

Read More

Bacterial Leaching

dump and heap leaching involve the application of the lixiviant to the top of the dump or heap surface and the recovery of metal laden solution that seeps to the bottom by gravity flow. The dilute sulphuric acid sprinkled on top percolates down through the dump, lowering the pH and promoting the growth of acido­ philic microorganisms.

Read More

Minerals | Free Full-Text | Study of Copper Leaching from ...

This study evaluates the suitability of Copper recovery in mining wastes, coming from waste dump, with a high percentage of metal oxides and granite. This recovery is carried out through leaching in 0.05, 0.10, 0.15 and 0.20 molar Sulphuric Acid solutions, at ambient temperature and atmospheric pressure.

Read More

Copper Dump Leaching and Management Practices That ...

The acid strength of the leach solution varies proportionately with the rate of leaching,-the grade of the copper ore leached, and the amount of acid-consuming gangue present in the ore.10 The pregnant liquors produced by heap leaching are generally much higher in copper content than those produced by dump leaching because ore grades are higher ...

Read More

SRFN acid plant still an environmental issue after 64 ...

The Spanish dump has tons of debris in it from the first remediation, but still more work is done, and it truly may never be fully repaired." Fifty-eight years after the acid plant closed in SRFN the issue of environmental damage is unresolved as is the matter of compensation to the First Nation.

Read More

Heap Leaching - an overview | ScienceDirect Topics

The best parameters for mixed-acid leaching of the stone coal from Guizhou, China are as follows: 15% sulfuric acid and 8% fluorosilicic acid, leaching time of 12 h, leaching temperature of 95°C, and leaching liquid-to-solid ratio of 1:1, resulting in a …

Read More

Leaching in Metallurgy and Metal Recovery

1) Vat Leaching: Also known as "agitated tank" leaching, the lixiviant comes into contact with the metal material in large vats or tanks, which can be stirred, enhancing the reaction kinetics. The metal containing solid, such as concentrate, ore, residue, or slag, often undergoes size reduction via crushing and grinding prior to leaching.

Read More

US3834760A - In-situ generation of acid for in-situ ...

In-situ leaching of underground, copper-bearing ore deposits or waste dumps containing copper sulfide minerals is accomplished by introducing a hydraulic fluid containing particulate pyrite into the underground ore deposit or waste dumps under sufficient pressure to fracture the formation and to deposit the pyrite particles contained in the fluid in the fractures as a propping agent.

Read More

A Guide to Leaching Tests-Final

leaching tests, interpretation of leaching test results, factors ... dilution), as well as a pH of 5 ± 0.2 using 0.5 N acetic acid. The 20:1 L/S ratio was used based on the assumption that 5 percent of the potentially hazardous waste was co-disposed in an MSW landfill. The

Read More

(PDF) In situ and Dump Leaching of Phosphate Rock

Habashi proposed in situ, dump or vat leaching of phosphate rocks with dilute HNO 3 (20%) or HCl (10%) to get a solution of monocalcium phosphate, and …

Read More

Dump and Heap Leaching - HydroJex

Dump and Heap Leaching 33 LEACH PADS. The leach pad itself is a key element of the heap or dump leach process. Selection of the type of leach pad, detailed pad . design, liner selection, construction techniques, and assess-ment of geotechnical risks are all part of the overall leach pad development process. Types of Leach Pad

Read More

A comparison of the uranium recovery from low-grade ore by ...

uranium ores are based on heap leaching, dump leaching, percolation leaching, mine waters biotransformation (Chmielewski et al., 2016; Rewerski et al., 2013). The goal of the present study was to compare uranium recovery by bioleaching and acid leaching in identical columns under similar process conditions for the same material.

Read More

Implementation of Sulfuric Acid Leaching for Aluminum and ...

Implementation of Sulfuric Acid Leaching for Aluminum and Iron Removal for Improvement of Low-Grade Silica From Quartz Sand of Sukabumi, Indonesia

Read More

(PDF) Evaluation of Copper Leaching for Subsequent ...

The material from the waste dump selected as potentially viable is leached with different sulfuric acid solutions (0.25, 0.5, 1, and 2 mol) and at different times, obtaining copper concentrations ...

Read More

How copper dump leaching works - ScienceDirect

Abstract. In copper dump leaching, run-of-mine ore is irrigated with acidic leaching solution to generate aqueous cupric ions for further processing. The very large size of the ore particles being leached, as much as two meters in diameter, should preclude any significant metal recovery. Dump leaching should not work; and yet it does.

Read More

【Dump Leaching】-SCIdict …

Heaper Dump Leaching . In-situ Mining and Dump Leaching . coal mine dump . Acid column leaching . Leaching Residues . leaching quota . selectively leaching ; ; . chloridizing leaching

Read More

(PDF) In-situ and dump leaching technology: Application to ...

In the nitric acid leaching of phosphate rock 20 kg of barium nitrate can be added to the leach solution followed by 20 kg of potassium sulfate per tone rock to produce 23 kg of a precipitate ...

Read More