dump leaching ores

Dump leaching refers to as-mined ore that is piled in rock depositories ('dumps'), ... gold ores, acid leaching for copper oxide ores and oxidative acid leaching of secondary .

The principal methods of leaching copper ores at the present time are heap, dump, in-place, and vat. A number of references are presented in the bibliography on the theoretical and practical aspects of these methods. In the heap-leaching method, crushed or uncrushed oxidized copper ore is placed on a prepared drainage pad.

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 materials: the ...

Unique to heap leaching is the relatively coarse particle size, typically 12–25 mm top size for crushed and agglomerated ores and larger for run-of-mine dump leaching operations.

Extracting non-ferrous and noble metals from the low-grade ores by using heap and dump leaching methods has become widely used abroad and nowadays – in Kazakhstan. Global practices [ 4, 5, 6 ] along with the experience of Kazakhstan metal mining enterprises that utilize heap and dump leaching of oxidized and sulfide ores [ 7 ] …

Gold and silver can be recovered from their ores by a variety of methods, including gravity concentration, flotation, and agitated tank-leaching. Methods similar to heap leaching can be employed: dump leaching and vat leaching (vat leaching is the treatment of sand or crushed ore in bedded vats with rapid solution percolation). …

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...

This distinguishes heap leaching from dump leaching. In dump leaching, ores are stacked and leached in the most economical way possible, and success is achieved with any level of net positive cash flow. The bibliography of precious metals heap leaching is quite extensive, and because of time ...

Dump leaching is characterized by very low-grade ore leaching. It involves run-of-mine material that has not undergone significant crushing or processing. Dump …

This has resulted in renewed interest in heap leaching of uranium ores, and in the development of processes for the bacterial heap leaching of low-grade chalcopyrite ores and the acid heap leaching of nickel laterites. ... The status globally and in Southern Africa 2011 L W John Heap or dump leaching can also be considered as a means to pay for ...

Heap leaching is a hydrometallurgical technique that is far less sensitive (economically) to low grade ores compared to other mineral processing techniques (Ilankoon and Neethling, 2016, Petersen, 2016).The crushed (-25 mm particles) and/or agglomerated ore is piled to construct the heap and leaching solution is applied to the …

Dump leaching is applied to rejected ore, e.g. from an open pit mine, that has a grade that is too low for the main process in use and to oversize ore from the mine that cannot be …

In this study, a mixed culture of meso-acidophilic bacteria, A. ferrooxidans and L. ferrooxidans, from the Davidschacht dump in Freiberg, Germany, was used. For the cultivation of the leaching bacteria, ... Germany, confirmed that this approach could be applied to the leaching of oxidized metalliferous ores. The results obtained by reductive ...

1. Slope leaching: Finely ground ores (up to 100,00 tons) are dumped in large piles down a mountainside and continuously sprinkled with water containing Thiobacillus. The water is collected at the bottom and reused after metal extraction and possible regeneration of the bacteria in an oxidation pool. 2.

Dump and heap leaching (via irrigation and percolation of acid onto and through the material) is often the selected process option for many marginal low-grade orebodies typically for Cu, Uranium and Ni ores. This process …

Copper recovery is about 80%. In Uzbekistan, the heap leaching method is planned to be applied to the Kalmakyr deposit dump's poor ores. Copper should be in …

The phenomenon of preferential solution flow during dump leaching of low-grade ores was studied. The formative mechanism of preferential solution flow was investigated through analyzing the relationship between permeability and ore diameter, and the relationship between surface tension and ore diameter. The preferential solution flow …

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.

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.

Dump leaching is an efficient process for the use of lower-grade ores and a new process to deal with ores that cannot be handled by conventional technology. In the dump leaching process, unsaturated lean liquor solution flows in the ore bed where chemical reactions take place (Sheikhzadeh, 2005).

Dump leaching is a way to economically extract some value from what is otherwise waste material. Dumps are located on natural slopes and leach solutions flow to a natural drainage basin. ... Leaching Chemistry. Copper ores are typically heap leached when a concentrate cannot be made. This may occur in the case of low-grade Cu ores (e.g. <0.5% ...

This paper deals with the investigation of column leaching of low-grade ores from the copper mine Cerovo, Serbia (the approximate Cu content in the ore ranges from 0.2 - 0.3 % with >10 % copper in the form of oxide ... Dump, heap and in-situ leaching are the most common hydrometallurgical methods for copper recovery from these raw materials on ...

In situ leaching (ISL) is an attractive technique that enables copper recovery from copper oxide ores that are either low-grade or located at depths too great to be economically exploited through conventional methods. At present, in situ leaching (ISL) has been applied to intact copper oxide ores, in particular, those which (i) present a good …

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 materials: the ...

[13], or vacuum separation in the example of ores of rare-earth metals [14]. Liquid extrac-tion technology of the sulfuric acid leaching method remains the main processing method for off-balance ores and waste dumps which predominantly comprise oxidized forms of copper. Therefore, the study of the effect of the composition of copper …

13.4.2 Dump Leaching. Dump leaching is the oldest method. Dump leaching essentially includes the piling up of uncrushed waste rock in dumps (Siddiqui et al. 2009). It's used for mineral extraction which involves low-grade ores. The greater rocks are cracked via blasting in the pit and are carried as big fragments to dumps.

Dump leaching has mostly been applied to gold, silver, and copper ores, whereas heap leaching has been applied to many different minerals including copper, gold, silver, ura …

Percolation leaching methods have been very effective in extracting metals from low grade ores, which could not otherwise be economically extracted. 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 …

Unique to heap leaching is the relatively coarse particle size, typically 12–25 mm top size for crushed and agglomerated ores and larger for run-of-mine dump …

Dump leaching is an efficient process for the use of lower-grade ores and a new process to deal with ores that cannot be handled by conventional technology. In the …

Tank leaching is more expensive to construct and to operate than dump, heap, or in situ leaching processes. But the rate of metal extraction is much higher and currently this technique is successfully used for bioleaching of refractory gold ores.

Therefore, the study of the effect of the composition of copper dump ores on the copper recovery rate and the final consumption of sulfuric acid, ... IC C01G 3/00 Acid Heap Leaching of Copper Ores with Addition of Fluoroaliphatic Surfactants/Minnesota Mining and Manufacturing Company. U.S. Patent 5207996, 10 October 1991.

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 …