The heap leaching process has been widely used for recovering different metals since its first application at the end of the 1960s. In Chile, copper production via heap leaching has accounted for between 30 and 40% of annual copper production over the past 10 years. This level of production has been achieved through and supported by the use of a mathematical …
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.
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 …
10. Dump leaching or slope leaching In dump leaching, the size of the dump varies; The ores used here may be in the range of several hundred thousand tons of ore. The top of the dump is sprinkled with water or acidified water or acid ferric sulphate solution containing inoculum. The percolated water is collected at the bottom. Before recirculation, the collected …
with different leaching characteristics. Seasonal variations such as rainfall or cold weather can also have a significant impact on production. The irrigation scheme introduces a new level of complexity. Leaching may be single stage or multi-stage, with intermediate solution recycled to the heaps to build up solution grades. The new nickel
The Satbayev dump sample was pretreated using a bacterial solution, with a lower concentration of sulfuric acid during the first 20 days for the biochemical variant of the leaching process, after which the leaching process was performed with 2.5% sulfuric acid solution, initially, followed by a subsequent decrease in concentration.
Dump leaching: metode hidrometalurgi yang dilakukan pada material off-grade (kadar rendah) yang sudah di-reject saat proses penambangan normal sudah diletakkan di tempat pembuangan besar (dump). Larutan diberikan ke permukaan dump lalu meresap dan dikumpulkan di kolam atau ditch di dasar dump. Ukuran partikelnya besar, tingkat recovery …
7.4.5: Heap Leaching Method. Heap leaching was first used to extract very low grades of metal ore from piles of plant tailings or waste rock. In the case of copper, for example, a solution of sulfuric acid was released at the top of the pile and allowed to percolate down through the pile. The effluent was collected and washed over scrap tin.
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 ...
ren in gold leaching, is refortified with the lixiviant chemicals and pumped to the top of the heap. Heap leaching is often broken into two principle distinc-tions, run-of-mine or ROM dump …
Heap leaching is the most important method of hydrometallurgical copper extraction. Heap leaching is used for treating oxide and lower-grade secondary sulfide ores that contain up to ∼2% Cu. The ore is crushed to a uniform particle size (typically 12–50 mm), often agglomerated, and then stacked on large flat-topped heaps in a controlled manner.. Heaps are typically ∼7 m high …
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 ...
Dump leaching is a method that utilizes chemical or bacterial leaching to process noncommercial and low-grade commercial coarse ore stockpiles, the extraction of useful components from which by conventional bene-ficiation or …
Dump leaching consists of truck end-dumping of ore broken only by the drilling and blasting of mining activity. After completion of ore placement, the surface is ripped using bulldozers to break up compaction layers and improve solution …
Table of Contents. 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 increasing in importance as one of the …
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 typically …
The weathering and leaching of slag dump by rain water is responsible for high concentration of Mn in groundwater near the slag dump site. 4.2 Saturation index Thermodynamic equilibria of the groundwater samples with mineral phases were assessed solving equation 10 using PHREEQCI software (Toran and Grandstaff 2002 ).
As a means of dump leaching of run-of-mine ore or mining waste that encouraged the growth of iron-oxidizing acidophilies, ... elemental sulfur can be biologically oxidized to produce sulfuric acid that maintains acidity of the bioleaching medium. The overall reactions of the pathway can be summarized as Eqs.
• If it is a dump leach, a leaching cycle time will define the mining delivery rate and dumping . ... although the dump design maintains smoothed boundaries. Figure 4. Minimum costs .
Dump and Heap Leaching. Randall Pyper, Thom Seal, John L. Uhrie, and Glenn C. Miller. Heap leaching is a hydrometallurgical recovery process where A simplistic heap …
1. Introduction. Heap leaching forms part of the group of technologies known as percolation leaching, which includes in situ leaching, dump leaching, heap leaching and vat leaching (Bartlett, 1998, John, 2011)mon to all these technologies is migration of leach solution through a fixed bed of ore particles, on its path interacting with the solid, releasing the …
Ind. Eng. Chem. Res. zyxwvu 1988,27, zyxwvu 2165-2169 2165 zyxwvutsrqp In Situ and Dump Leaching of Phosphate Rock Fathi Habashi* and Farouk T. Awadalla Department of Mining zyxwvutsrq & Metallurgy, Lava1 University, Quebec City, Canada GlK 7P4 Phosphate deposits with low carbonate content can be leached in situ or in dumps by dilute HC1 or HNO, to get a …
Dump leaching is an important supplement to open pit-mill production of copper, providing about 1.0 percent of the total copper recovered. Because dump leaching is slow and incomplete, much copper remains in the dumps after leaching has been terminated. Research to improve leaching efficiency is carried out by the Bureau of Mines as part of its ...
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.
Dump leaching requires years to extract part of the copper, and leach dumps often become impermeable owing to precipitation of iron salts which greatly reduces the …
Dump Leaching Ore Preparation. Although waste rock from either underground or open pit mines is of too low a grade to warrant conventional milling, some gold or silver may be recovered by leaching it. ... or it can be directed upward through the charcoal at a rate that maintains the charcoal in a suspended state (fluidized). Although columns ...
The leaching mining method is an ore mining method in which useful components in the deposits, ores, and waste rocks are dissolved, leached, and recovered by using chemical solvents or microorganisms through the effects of chemical leaching, mass transfer, heat, and hydrodynamics, according to the physical and chemical characteristics of minerals.
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.
The successful introduction of the technology of copper production using a dump leaching method is associated with low capital investments, low cost of copper extraction, quick payback, high labor productivity, and the absence of energy- and material-intensive operations. The experience of implementing dump leaching technology has shown that negative …
Heap leaching and dump leaching are well-known metallurgical processing methods used to extract gold from low-grade ore (Kappes, 2002). This method is typically used for ore containing <1 g gold per metric ton of ore where the contained gold value does not warrant the increased cost of milling, flotation and subsequent use of tank leaching ...
Dump leaching is rather cruder, though, than heap leaching, as the word implies. 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 crushed. Thus dump leach ore rock may exceed 1 m in size. Dump leaching is a way to ...
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. ... Agitators are …
of dump leaching opera tions implies that the . mining company sh ould proactively adopt . the best available practices in the design, con-struction, operation, maintenan ce, closure .
In contrast to dump leaching, heap leaching refers to the application of chemicals to low-grade ore that has been crushed and deposited on a specially designed pad. The pad is lined with synthetic or natural materials such as polyethylene or compacted clay. Copper heap leach operations are much smaller than copper dump leaches.
model of dump leaching presented here is simply that the exothermic sulfide oxidation reactions generate heat and consume oxygen from the air, and by so do- ing drive air convection through the dump. This air convection is the only significant source of oxidant to the dump. A system is envisioned in which a countercurrent ...
DOI: 10.1016/J.HYDROMET.2007.03.001 Corpus ID: 97060348; Study on preferential flow in dump leaching of low-grade ores @article{Wu2007StudyOP, title={Study on preferential flow in dump leaching of low-grade ores}, author={Aixiang Wu and Sheng-hua Yin and Bao-hua Yang and Jun Wang and Guan‐zhou Qiu}, journal={Hydrometallurgy}, year={2007}, volume={87}, …
