acid leaching dump

Copper Dump Leaching and Management Practices That ...

The pH of the leaching reagent averages approximately 2.4 and contains 4-5 gpl of sulfuric acid. The pregnant liquor solutions from Dumps 2, 2A and 3 are collected in ponds and pumped to a solvent extraction/electrowinning (SX-EW) plant. The SX-EW plant is currently …

Alumina Recovery From Copper Dump Leaching Liquors …

Alumina Recovery From Copper Dump Leaching Liquors Using a Supported Liquid Membrane By S. P. Sandoval and L E. Schultze UNITED STATES DEPARTMENT OF THE INTERIOR Manuel Lujan, Jr., Secretary BUREAU OF MINES T S Ary, Director

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 ...

Dump and Heap Leaching - HydroJex

Dump leaching consists of truck end-dumping of ore broken only by the drilling and blasting of mining activ - ity. After completion of ore placement, the surface is ripped using bulldozers to break up compaction layers and improve solution distribution uniformity.

Placement of waste rocks in waste dump for prevention of ...

This study presents the effects of pH on the progress of AMD with the results of leaching test under various pH conditions using rock samples taken in coal mine: pH was set at 3.0, 6.0, and 8.0. ... Placement of waste rocks in waste dump for prevention of Acid Mine Drainage (AMD) by Cover system in open cast coal mine : Effects of water quality ...

Leaching - SlideShare

Dec 29, 2015· Lab: Percolator leaching Suspension leaching in shake flasks Column leaching Technical leaching process: Dump leaching Heap leaching In situ leaching Stirred tank Process. 13. Kennecott copper corp. at Bingham Canyon, USA. – dump leaching. Chino Mine in New Mexico, USA.

Research on Reinforcing Acid Leaching of a Refractory ...

The characteristics of Yangla copper oxide ore and acid leaching of this copper ore were investigated. The results indicate direct dump acid leaching of raw ore is not feasible for the treatment of this copper ore in practice. Sieve sizing-warming-stirring-acid leaching process was employed for the treatment of the fine grain materials below 1m, while 66.19% copper leaching efficiency and10.92 ...

Uranium processing - Leaching | Britannica

Uranium processing - Uranium processing - Leaching: Roasted uranium ores are leached of their uranium values by both acidic and alkaline aqueous solutions. For the successful operation of all leaching systems, uranium must either be initially present in the more stable hexavalent state or be oxidized to that state in the leaching process. Acid leaching is commonly performed by agitating an …

Copper extraction - Wikipedia

Such oxide ores are usually leached by sulfuric acid, usually in a heap leaching or dump leaching process to liberate the copper minerals into a solution of sulfuric acid laden with copper sulfate in solution.

Tailings - Wikipedia

Piles of coal refuse can have significant negative environmental consequences, including the leaching of iron, manganese, and aluminum residues into waterways and acid mine drainage. The runoff can create both surface and groundwater contamination. Because most coal refuse harbors toxic components, it is not easily reclaimed by replanting with plants like beach grasses.

Heap Leaching - an overview | ScienceDirect Topics

The sulfuric acid produced in Eqns. (6) and (8) is used for leaching "oxide" minerals (like Eqn. (5)) and for Eqn. (7). It also makes up for some of the acid lost by neutralization in the basic host rock of the ore (e.g., limestone). Pyrite in leach dumps is often an important provider of sulfuric acid for leaching.

Dump leaching and similar topics | Frankensaurus

Dump leaching is similar to these topics: Gold extraction, Copper extraction, Heap leaching and more. Topic. ... Such oxide ores are usually leached by sulfuric acid, usually in a heap leaching or dump leaching process to liberate the copper minerals into a solution of sulfuric acid laden with copper sulfate in …

Ferric Cure Dump Leaching Process

Oct 13, 2018· This dump leach process for treatment of mixed oxide/sulfide ore includes: strict mineralogical control of ore placed for leaching, controlled leach pad construction, solution saturation and curing of the pads with higher acid concentrations, and, finally, rinsing of the cured pads for removal of dissolved copper.

(PDF) HEAP AND DUMP LEACH PROCESS AT THE BUCHIM …

Operating parameters such as particle size, leach time, flow rate, heap height and acid addition are evaluated. Physical tests and water tests are also was conducted to provide additional design information. A dump leach-ion exchange-solvent extraction-electrowinning process was selected to treat the Buchim ore to produce 2500 tpy of cathode ...

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

collected from Radoniow''s ''small'' dump, Poland. Bioleaching and acid leaching studies were carried out in identical columns. The isolated bacterial consortium from the Radoniow''s mine was used for the bioleaching process. A solution of sulphuric acid and H 2 O 2 …

LixTRA leaching technology for copper heap and dump leach ...

The ever-increasing demand for minerals and metals poses major challenges for the mining industry, especially when faced with depleting ore grades and more c...

Metal Leaching in Mine-Waste Materials and Two Schemes …

The surface samples were subjected to two leaching techniques to determine the concentration of water-soluble, deposit-related trace elements in the dump materials. Net acid production, an indication of the ability of a material to pro-duce acid when oxidized over a long period of time, was also determined.

CN103173612A - Acid dump leaching technology of atacamite ...

The acid dump leaching technology comprises the following steps of: crushing atacamite ores in two sections; screening; directly conveying oversize products to a stock dump to carry out the acid...

Distribution of heavy metal pollution in sediments from an ...

Nov 15, 2014· The results showed that the sediments from the acid leaching site were significantly contaminated with Cu, Zn, Cd, Sn, Sb and Pb, especially in the middle sediments (30-50 cm), with average concentrations of 4820, 1260, 10.7, 2660, 5690 and 2570 mg/kg, respectively.

Technical Document: Acid Mine Drainage Prediction

generating acid on Forest Service lands, and that drainage from these mines is impacting between 8,000 and 16,000 kilometers of streams (U.S. Forest Service 1993). In addition to the acid contribution to surface waters, AMD may cause metals such as arsenic, cadmium, copper, silver, and zinc to leach …

The process design of gold leaching and carbon-in-pulp ...

Leaching reagents in the form of cyanide and an oxidant such as air or oxygen are added after thickening. Leaching takes place in a series of agitated leach reactors or pachucas. Before leaching the pH of the pulp is normally adjusted to a value of around 9.5–11 to ensure minimum loss of cyanide as hydrogen cyanide.

Innovations in Copper: Mining & Extraction: Producing ...

Dump leaching - waste rock, low grade ore or concentrator tailings (low grade, oxides and secondary sulfides) are leached where placed for disposal. (Mature technology, widely used)

(PDF) In-Situ and Dump Leaching Technology: Application to ...

The purpose of the present work was to introduce to the a terrain is prepared on which the crushed ore is piled and phosphate industry a technology widely used in the hy- the leaching acid is introduced at the top of the pile and drometallurgy of nonferrous metals, namely, in situ and collected at the bottom-a system that is also extensively dump leaching (Habashi, 1969; Schlitt and Hiskey, 1981; used for gold, …

Dump Leaching Copper Recovery

Aug 26, 2017· Dump leaching of low-tenor ores is a simple procedure whereby leach solution is distributed over the top of the dump to dissolve the copper minerals as the solution percolates through the bed. The enriched leach liquor is collected at the base of the dump, treated to recover the copper, and recycled to the dump.

Hydrometallurgical Options to Add Value to Copper …

In-Situ Leaching • Minerals – Oxides • Lixiviant – Acid or Alkaline • Not widely applied, needs the right geology and permitting • e.g. Mount Gordon - QLD • e.g. Florence,Arizona ex- BHP Copper still on hold Dump/Heap Leaching • Minerals – Oxides / Sulphides • Lixiviant – Acid or …

A partial equilibrium chemical model for the dump leaching ...

In a dump, chalcopyrite can dissolve in two ways: CuFeS 2 + 4Fe 3+ → Cu 2+ + 5Fe 2+ + 2S° CuFeS 2 + O 2 + 4H + → Cu 2+ + Fe 2+ + 2S° + 2H 2 O CuFeS 2 dissolution is not at equilibrium in a leach dump. However, there are a large number of homogeneous reactions taking place in the leach liquor.

A Method for Leaching or Dissolving Gold from Ores or ...

The hydrometallurgical leaching of native gold from gold-bearing ores or the dissolution of gold metal during the recycling of electronic and precious ... Note that the vapor pressure of the acid corresponds to the sum of the vapor pressure of HCl and water above the solution taken from tabulated data found in …

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