Bacterial Leaching
Dump leaching involves uncrushed waste rock which is piled up. These dumps generally contain about 0.1-0.5% copper, too low to recover profitably by conventional procedures. Some of these dumps are huge, containing in excess of 10 million tons of waste rock. Heap leaching requires the preparation of the ore,
اقرأ أكثرStudy on preferential flow in dump leaching of low-grade ores
The production of dump leaching at the Dexing Copper Mining in China was influenced by preferential flow. The mechanism of preferential solution flow was investigated by analyzing the relationship between dump permeability and surface tension, ore diameter. The negative pore water pressure was high due to the small particle and pore diameter.
اقرأ أكثرLixTRA 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...
اقرأ أكثرDump leaching - Big Chemical Encyclopedia
Recovery of copper from solutions generated in heap/dump leaching with sulfuric acid by cementation with iron. [Pg.544] Health R D (research and development) expenditures, 27 612 Health standards, at nuclear power facilities, 7 7 551-554 Health uses, for iodine, 74 372-373 Heap and dump leaching, 76 153 Heap leaching, 72 689-690, 699-700 76 128...
اقرأ أكثرLEACHING 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
اقرأ أكثرMethod of Heap Leaching of Copper from Off-Balance Ore …
The article deals with heap leaching of copper ores taken from the dump of the Kalmakyr mine. The depletion of the copper raw material base's reserves is focused on the Almalyk mining and metallurgical company's work. Despite the company also requires to find additional copper-containing geo-resources, the source of significant reserves of raw ...
اقرأ أكثرMicroflora of two industrial copper dump leaching operations
The present paper discusses the results obtained during, the 18-year period of the industrial copper dump) leaching operation. The flowsheet is presented and each separate component of the complex ...
اقرأ أكثرLixTRA™ – Novel Copper Leach Technology - BASF
Heap and Dump leaching are processes used to extract metals such as copper, gold, nickel and uranium from their ores by placing the ore on a pad in the form of a heap. A heap leach encompasses a level of comminution while a dump leach is run of mine (ROM), where the ore is moved directly from mining to lixiviation.
اقرأ أكثرChapter 6 Copper Production Technology - Princeton …
Solution of copper and leaching agent20-50 (water orHAO.) Copper, iron (0.2-2.00/0), trace amounts of85-90 silica and aluminum oxides, and oxygen ... dump leaching uses materials that have already been mined and broken UP withexdosives bpflma~ily Iow.grade oxidized minerals (e.g., malachite,azurite, chrysocolla,-cu prite, tenorite) ...
اقرأ أكثرRecovery of copper by dump leaching with use of bacteria and ...
The ore piles in the proximity of the Vlaikov Vrah mine, Bulgaria, contain about thirty million tons of waste low-grade copper sulphide and mixed ores. In 1972 industry began using these ores for recovering copper by means of microbial leaching. The present paper...
اقرأ أكثرDump leaching - Wikipedia
The solution containing gold and silver exits the base of the dump, is collected and precious metals extracted. The resultant barren solution is recharged with additional cyanide and returned to the dump. This method of leaching is usually suitable for low grade ores because it …
اقرأ أكثرRecovery of copper by dump leaching with use of …
In 1972 industry began using these ores for recovering copper by means of microbial leaching. The present paper discusses the results obtained during, the 18-year period of the industrial copper dump) leaching operation. The flowsheet is presented and each separate component of the complex production process is described.
اقرأ أكثرCopper Dump Leaching and Management Practices That …
In the copper industry, dump leaching methods are used to extract copper from ores too low in grade to concentrate by conventional beneficiation and froth flotation. The dissolved copper is subsequently recovered from solution by precipitation onto scrap iron …
اقرأ أكثرHow copper dump leaching works - ScienceDirect
The difference between heap and dump leaching is mostly related to scale, and is driven by the copper content of the ore ( Petersen, 2016, Marsden, 2008 ). Ores with relatively high copper grades are leached in heaps: the ore is crushed, agglomerated, stacked in lifts generally less than 10 m high, and irrigated for periods of less than 18 months.
اقرأ أكثرMines – Asarco
Copper-bearing solutions from the dump leach and rubble areas are collected and pumped to the solvent extraction plant where the copper in solution is concentrated over 30 times before being pumped to the tank house. In the tank house, the copper is recovered from solution using the electrowinning process and plated on stainless steel starter ...
اقرأ أكثرJetti Resources | A Technology Driven Natural Resources Company
Jetti has developed and commercially deployed a catalytic technology that allows for the efficient and effective heap and stockpile leach extraction of copper trapped in these challenging mineral ores. Jetti's catalysts enable the disruption of the sulfur metal bond of the mineral, allowing copper extraction to take place unimpeded.
اقرأ أكثرAlumina Recovery From Copper Dump Leaching Liquors …
covering aluminum from copper dump leaching liquors. These solutions contain up to 15 giL Al and represent more than 2,000 stld A~03 (alumina). Earlier efforts to recover the aluminum evaluated solvent extraction (1)3 and ion-exchange methods (2). Solvent extraction successfully recovered an aluminum product, but the need to maintain
اقرأ أكثرWaste Dump Leaching Copper - 911metallurgist.com
Some of the waste is leached with acidic solutions that percolate through the dump and dissolve a portion of the copper. Dump leaching is an important supplement to open pit-mill production of copper, providing about …
اقرأ أكثرCopper Dump Leaching and Management Practices That …
Introduction Dump leaching refers to percolation leaching of copper from run-of-mine low-grade ores that have been piled on native ground. These dumps typically cover hundreds of acres and contain millions of tons of low-grade ore. The leaching cycle covers a span of many years.
اقرأ أكثرCapstone Copper - Pinto Valley Mine
Pyrite Agglomeration: To divert acid-generating minerals including chalcopyrite from tailings to the dump leaching operations, where additional Copper can be recovered and some acid necessary for production can be generated. This is a low-capital project (~7M with a quick one-year payback).
اقرأ أكثرChallenges Faced by Dexing Copper Mine ― A Case Study of Dump Leaching …
The height of the dump exceeds 70 m, and the inclination of the slope is 55°. The failure of dump could result in a dangerous disaster. Mechanical properties of the waste rock before and after leaching were investigated. The result shows that the normal stress, shear strength and cohesion decreased sharply during the leaching process.
اقرأ أكثرMETHOD OF HEAP OR DUMP LEACHING OF COPPER FROM COPPER SULFIDE ORE ...
1. A method of leaching copper from a copper sulfide ore, characterized by comprising leaching copper from an ore comprising a copper sulfide ore by means of heap or dump leaching with the use of a sulfuric acid solution containing ferric (III) ions and iodide ions at a total iodine concentration of 8 to 100 mg/L as a leaching solution.
اقرأ أكثرInfluence of Chelating Reagents on Leaching of Copper Ore
gents to simulated dump leaching 1ixi viants could increase the dissolution of metals and the liquid flow rates. The research was divided into three phases. In phase 1, an assortment of synthetic copper dump 1ixiviants (with and without chelating reagents, molybdenum, titani um, etc.) were prepared, and their pH's
اقرأ أكثرDump Leaching Copper Recovery - Metallurgist
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.
اقرأ أكثرDump and Heap Leaching - HydroJex
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 elements.
اقرأ أكثرTechnological assessment of a mining-waste dump at the Dexing copper …
In order to extract copper metal from the waste dump of Dexing copper mine and resolve the environmental problems caused by acidic water and heavy metals, a dump bioleaching plant was designed based on a series of experimental investigations. ... To evaluate the potential unstability of the dump, the leaching process, ore surface erosion ...
اقرأ أكثرCapstone Copper - Operations - Mantoverde
For material sent to the run-of-mine dump leach, the processing cost was US$2.12/t. Total copper recoveries average 88.4% for sulphides and gold recoveries average 71.2%. Soluble copper recoveries average 76.4% for material sent to the heap leach and 45.8% for material sent to the dump leach process. Inter-ramp angles vary from 26˚ to 60˚.
اقرأ أكثر(PDF) Industrial copper dump leaching operation at …
The present paper discusses the results obtained during, the 18-year period of the industrial copper dump) leaching operation. The flowsheet is presented and each separate component of the complex ...
اقرأ أكثر(PDF) Large-scale application of biological copper dump leaching …
The observations cover two periods: from 1968 t0 1972, when the dump was an area of natural leaching processes, and since 1972, when industry began using it for recovering copper by means of ...
اقرأ أكثرDump Leaching and Cathode Copper Extraction (SX-EW) Plant …
Dump Leaching and Cathode Copper Extraction (SX-EW) Plant EIA Supplementary for Erdmin Co.,/Marubeni Japan, Capital Resources Inc., USA, 1998. Erdmin SX/EW plant began commercial activity in 1997 based on Erdenet Mine Low grade ore Dumps. The main technology is Solvent extraction and Electro wining. The Plant has been producing …
اقرأ أكثرHeap Leaching - Mineral Processing & Metallurgy
Copper heap and dump leaches in southern Spain were common by about 1700. Gold and silver heap leaching began with the first Cortez heap leach in 1969. While many projects have come and gone, Cortez is still going – their new 63,000 tonne/day South Area leach is scheduled to start up in 2002. The largest U.S. precious metal heap leach gold
اقرأ أكثرWaste Dump Leaching Copper - 911metallurgist.com
Dump leaching is an important supplement to open pit-mill production of copper, providing about 1.0 percent of the total copper …
اقرأ أكثرCopper Dump Leaching and Management Practices That …
Estimates indicate that more than 5.5 billion metric tons of leach ore now exist in copper leach dumps scattered around the United States and in excess of 40 million metric tons of new material is being added to these dumps annually. Dump leaching and heap leaching are distinguished by the use of liners. Dump leaching refers to the leaching of ...
اقرأ أكثرHeap 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.
اقرأ أكثر[PDF] Copper recovery using leach/solvent …
The concept of selectively extracting copper from a low-grade dump leach solution followed by stripping the copper into an acid solution from which electrowon copper cathodes could be produced occurred to the Minerals Group of General Mills in the early 1960s. This simple, elegant idea has resulted in a technology by which about 2.2 million tonnes of …
اقرأ أكثرDump leaching - Big Chemical Encyclopedia
In the dump leaching of copper waste dumps, an average value of 0.30% is... [Pg.7] Between 45 and 90°C, the reaction of cubanite with acidic ferric sulfate solutions followed linear kinetics, indicating that the rate-controlling step was some reaction occurring on …
اقرأ أكثرLeaching Aids - BASF
leaching technology for copper heap and dump leach processes. The ever-increasing demand for minerals and metals poses major challenges for the mining industry, especially when faced with depleting ore grades and more complex …
اقرأ أكثر