Engineering, Environmental Science. 1993. Keywords: Mecanique des sols ; Sols non satures Reference Record created on, modified on . 3,430. PDF. Semantic Scholar extracted view of "Study on preferential flow in dump leaching of low-grade ores" by A. Wu et al.

The objective of this study was to investigate the leaching of a non-sulfide copper ore by a new bioleaching process, the Ferredox process. In the Ferredox process, Acidithiobacillus ferrooxidans reduces ferric ions and oxidizes sulfur at low pH under anaerobic conditions. In this study, a bacterial culture (mainly A. ferrooxidans) was …

Property Value; dbo:abstract Dump leaching is an industrial process to extract precious metals and copper from ores. Dump leaching is similar to heap leaching, however in the case of dump leaching ore is taken directly from the mine and stacked on the leach pad without crushing where, in the case of gold and silver, the dump is irrigated with a dilute …

This contrasts with the parallel and older technology of dump leaching where ore is generally leached in its "run-of-mine" state, placed in very large tonnage and thick lifts …

Dump leaching and in-situ solution mining have received considerable attention during the past few years due to their apparent economic viability and minimal environmental impact. Solution mining …

The enriched leach liquor is collected at the base of the dump, treated to recover the copper, and recycled to the dump. Copper recovery methods currently used include either solvent extraction followed by electrowinning or cementation of the copper using scrap iron. Copper recovery by cementation has been practiced for hundreds of …

Publication Date: Jan 1, 1980. Abstract. Email to a Friend Leach water management is one of the few areas in dump leaching subject to operator control. As such, it is of considerable importance. Theoretical considerations indicate that high leach solution application rates are inefficient in washing solubilized copper from dumps. The high rates ...

Purchase this Article for $25.00. Dump leaching at Teller in its present form began in the fourth quarter of 1988 as an adjunct to milling operations. Initial plans called for a dedicated dump leach facility capable of processing ore at an annual rate of 2.0 million tonnes. Construction of a dump leach pad, collection and process ponds, carbon ...

A dump located in the proximity of the Vlaikov Vrah mine, Bulgaria, and containing about 120,000 tons of run-of-mine mining wastes (low-grade ores and rock mass), since 1968 was subjected initially to spontaneous natural bioleaching based on the rains as irrigating leach solutions, then from 1972 to 2003 to commercial-scale bioleaching by means of irrigation …

a) Dump Leaching In most applications, dump leaching is a convenience for open pit mining operations to dispose of lower grade or waste rock (typically below 0.2% Cu) (4) and stripped material with the intention of recovering the valuable metals contained therein (Figure 1). Dump design is dictated by topography and haulage costs.

Scheffel, R.D. Heap Leaching Design for Success-a Case Study. In Proceedings of the Low-Grade Uranium Dump and Heap Leach Technical Meeting, Vienna, Austria, 29–31 March 2010. Petersen, J. Heap leaching as a key technology for recovery of values from low-grade ores—A brief overview. Hydrometallurgy 2016, 165, 206–212.

Fluid flow is a critical process involved in the valuable metals extraction from low grade ore in heap and dump leaching as well as the release of harmful substances from waste rock piles. The mechanisms by which fluids move through the porous media depend on the fluid properties ... Date Available: . Provider: Vancouver : University ...

Copper waste dump leaching is growing in importance because of the.large tonnages (up to 250,000 ton/day) of low grade waste rock available from open cut mining of copper …

Dump leaching is a method that utilizes chemical or bacterial leaching to process noncommercial and low-grade commercial coarse ore stockpiles, the extraction …

In this case, the dump leaching technology may be used; i.e., a terrain is prepared on which the crushed ore is piled and the leaching acid is introduced at the top of the pile and collected at the bottom-a system that is also extensively used for gold, copper, and uranium ores (Habashi, 1969). In the present work, experiments were conducted to ...

The date of demolition is not known." (Oquirrh Mountains Mining and the Environment by Eva J. Hoffman, U. S. Environmental Protection Agency, Denver, April 21, 2005, page 56) ... "Dump leaching and precipitation plant operation is set up as a separate department to be headed by a general leaching foreman." (Salt Lake Tribune, March 2, …

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...

Copper waste dump leaching is growing in importance because of the.large tonnages (up to 250,000 ton/day) of low grade waste rock available from open cut mining of copper deposits and proof that controlled leaching of copper from such dumps can be profitable.Overburden or waste rock, ranging in size from large boulders to fines, is …

Percolation leaching techniques, such as heap leaching, dump leaching, bio-leaching and in-situ leaching have been extensively employed in the Chinese mining industry in recent decades, primarily ...

Heap leaching copper from oxide and secondary sulfide ores has been practiced commercially since the late 1960's. This methodology is mostly used for low-grade ores and involves the following basic processing steps: Mining, Crushing, Leaching, Solvent Extraction (SX) and Electrowinning (EW). Depending on ore characteristics other …

This report presents a description of the magnitude and distribution of copper dump leaching, the design and operation of Teaching facilities, the potential for environmental …

A one dimensional, nonsteady-state model of the copper waste dump leaching process has been developed which incorporates both chemistry and physics. The model is based …

Dump leaching practice generally consists of dumping the low-grade run-of-mine material. The material is dumped over the edges of mining terrain under which a liner has been placed. It is sometimes placed on lined leaching pads. Leaching solutions are applied at the top of the dump and allowed to percolate through the dump.

LixTRA™ is a surfactant that boosts copper heap and dump leach performance by increasing metal recovery and reducing mining costs in an environmentally sound and sustainable manner. It is a liquid, which is added in small (ppm) quantities to the irrigation system of the leaching process. It is a non-hazardous, low ing, non-ionic oligomer.

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 to allow recovering uranium and rare earths ...

dump copper acid days Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. ... Generally, dump leaching is performed with minimal solution control and recoveries do not exceed 40 to 60% of the copper present in the ore after periods up to five years of leaching. Recoveries are even poorer when ...

Dump leaching began at Teller in late-1988 at a rate of 4 MTPA and has been progressively expanded to the present rate of 10 MTPA. Teller's on-going commitment to dump leaching is driven by the amenability of gold ores to the process and the availability of large tonnages of low grade gold ore. The sequence of evaluating ores for dump …

The copper heap leaching, solvent extraction, and electrowinning process has revolutionized the copper industry and significantly reduced the capital and operating costs for the production of copper from low-grade ores.A schematic of a typical heap leach/SX/EW operation is shown in Fig. 4.29.The SX part of the flowsheet recovers …

The dump leaching of low-grade copper ores, as an integral part of the open-pit mining operations in the Southwest, has been practiced for the last fifty years and is …

A one dimensional, nonsteady-state model of the copper waste dump leaching process has been developed which incorporates both chemistry and physics. The model is based upon three equations relating oxygen balance, heat balance, and air convection. It assumes that the dump is composed of an aggregate of rock particles containing nonsulfide …

Abstract. Preferential flow in dump leaching of low-grade ores was investigated in this paper. The production of the dump leaching plant at Dexing Copper Mining in China was significantly influenced by preferential flow due to the heterogeneity of the ores in dump. Surface tension, negative pore water pressure, matrix suction and …

diverse aspects of dump leaching into a coherent all- embracing model. %3 While we do not feel that the model presented in this paper is the final answer to a clarification of the dump leaching process, we be- lieve that it forms a basis upon which subsequent re- search in this area might be coordinated.

Design and Operation of Copper Leaching Systems 24 Dump leaching 24 Heap leaching 28 Other leaching processes 31 Copper recovery processes 34 4. Potential for Environmental Impact 39 Potential mechanisms for the release of contamination 40 Sources and characteristics of potential ground-water contamination 41 Ground-water …

Dump leaching. Heap and in-situ leaching characteristics are combined in dump leaching. Depending on the dump location, an impermeable layer may or may not be employed in a dump leach. The ore is dumped to allow similar processing to heap leaching, but the geological conditions of the area allow a valley or pit to act as the …

Publication Date: Sun Aug 01 00:00:00 EDT 1982 Research Org.: Arizona Univ., Tucson (USA). Dept. of Chemical Engineering OSTI Identifier: ... The technology selected is the dump leaching of copper and other metal values from low-grade copper ores. The portion of the presently used process to be placed in this case is the solvent extraction (SX ...

CA1093837A CA278,624A CA278624A CA1093837A CA 1093837 A CA1093837 A CA 1093837A CA 278624 A CA278624 A CA 278624A CA 1093837 A CA1093837 A CA 1093837A Authority CA Canada Prior art keywords ore dump copper h2so4 acid Prior art date Legal status (The legal status is an assumption and is not a legal …

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 to allow recovering uranium and rare earths ...

Using dump leaching as an example, we analyzed the aerial images of a dump leach pad acquired by a camera installed on a drone while the leach pad was under construction. The image analysis results showed that the dump leach pad contained an extremely wide range of particle sizes. A spatial segregation of fine and coarse particles …

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, …