Characterization of electroosmotic drainage: application to mine tailings and solid residues from leaching

Cánovas, Manuel; Valenzuela, Julio; Romero, Leonardo; González, Paul

doi:10.1016/j.jmrt.2020.01.046

Cited by 21 publications

(19 citation statements)

References 49 publications

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“…Lee et al [5] dewatered mine wastes with 83.4% water content using DSA electrodes by applying increasing and decreasing voltages in pressurized and nonpressurized electroosmosis experiments. In Chile, the electroosmotic method was found to be effective in the dewatering of copper plant tailings [26]. Valenzuela et al [27] obtained lower moisture levels in their electroosmosis experiments for copper leaching than those obtained from gravity drainage tests.…”

Section: Introductionmentioning

confidence: 99%

Electroosmotic Dewatering of Iron Ore Tailings: A Laboratory Study to Improve Geotechnical Properties

Yüksek

2022

Advances in Civil Engineering

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Minerals are subjected to ore processing to turn them into usable and saleable raw materials. First of all, the ore is reduced to the smallest size with the crushing-grinding process, and after using water and chemical additives, according to the characteristics of the ore, useful minerals are taken, and unwanted minerals are stored in the tailings pools. Approximately, 26 million tons of mineral wastes were generated annually from ore processing facilities in Turkey. The construction of tailings pools, the stability of the tailing sludge, and the safety of dams are a burdensome issue faced by miners. In the ore plants, an average of 3 tons of water is used to enrich 1 ton of ore, and most of the wastewater cannot be removed by traditional methods, causing various economic, environmental, and stability problems. In this study, the dewatering of an iron ore tailing by applying different voltages by the electroosmosis method was investigated in the laboratory environment. By discharging the water of the iron ore tailings by the electroosmosis method, the solid content was increased from 43.01% to 87.63%. Thus, it has been observed that there will be a significant improvement in the geotechnical properties of the tailings’ material. It has been estimated that electroosmotic dewatering rises with increasing the voltage gradient and the energy consumption varies in the range of 0.588–30.645 kWh/dry ton. The void ratio decreased from 5.58% to 0.23%. In the dewatering experiments, different parameters such as the amount of water discharged, density, void ratio, water content, and power consumed were measured or calculated and the relationships between them were discussed with graphics. In electroosmosis experiments, it has been observed that besides the voltage applied in the discharge of water, the mineralogy of the tailings has a significant effect. Since there are serious abrasions on the electrodes used in the experiments, alternative electrodes should be tried.

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Section: Introductionmentioning

confidence: 99%

Electroosmotic Dewatering of Iron Ore Tailings: A Laboratory Study to Improve Geotechnical Properties

Yüksek

2022

Advances in Civil Engineering

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“…Electroosmotic dewatering is preferable to traditional dewatering techniques when dealing with low-permeability materials, such as fine soils, sediments, and sludge [7]. The pioneering work conducted by Casagrande to accelerate dewatering in consolidated clay soils with low hydraulic conductivity [8] is a technique that has been successfully applied to industrial applications, including soil consolidation [9,10], remediation of contaminated soils [11][12][13], food engineering [14], the dewatering of sludge [15], residues from metallurgical processes [16][17][18][19], and the nuclear industry [20], among other applications.…”

Section: Introductionmentioning

confidence: 99%

A Network Model for Electroosmotic and Pressure-Driven Flow in Porous Microfluidic Channels

et al. 2022

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In this work, the network simulation method is presented as a tool for the numerical resolution of the electroosmotic and pressure-driven flow problem in microchannels with rectangular and cylindrical geometries. Based on the Brinkman equation for steady flow and constant porosity, the network model is designed using spatial discretization. An equivalent electrical circuit is obtained by establishing an analogy between the physical variable fluid velocity and electric potential. The network model is solved quickly and easily employing an electrical circuit resolution code, providing solutions for the velocity profile in the channel cross-section and the total circulating flow. After simulating two practical cases, the suitability of the grid is discussed, relating the relative errors made in the variables of interest with the number of cells used. Finally, two other applications, one for rectangular geometries and the other for cylindrical channels, show the effects the main parameters controlling the flow in these types of channels have on velocities and total flow: the zeta potential of the soil pores, applied potential and pressure gradients, and the boundary condition modified by the zeta potential in the walls of the channel.

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“…Leaching is a process used to achieve the recovery of copper from oxidized minerals and secondary sulphides [2,3]. There are numerous challenges in maintaining copper production in Chile due to the location of the deposits and their natural conditions, including energy costs, environmental impacts, and water scarcity [4][5][6]. However, Chile's copper production from hydrometallurgy will suffer a sharp decrease, from 28.8% in 2017 to 11.6%, by 2029 [7] due to the depletion of oxide and secondary sulphides ores, leaving copper extraction from primary sulphides as the almost only alternative [8].…”

Section: Introductionmentioning

confidence: 99%

Pretreatment to Leaching for a Primary Copper Sulphide Ore in Chloride Media

Quezada

Roca

Benavente

et al. 2021

Metals

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The dissolution of copper sulphide ores continues to be a challenge for the copper industry. Several media and leaching alternatives have been proposed to improve the dissolution of these minerals, especially for the leaching of chalcopyrite. Among the alternatives, pretreatment prior to leaching was proposed as an option that increases the dissolution of copper from sulphide ores. In this study, a mineral sample from a copper mining company was used. The copper grade of the sample was 0.79%, and its main contributor was chalcopyrite (84%). The effect of curing time (as pretreatment) in a chloride media on copper sulphide ore was evaluated at various temperatures: 25, 50, 70 and 90 °C. The pretreated sample and leaching residues were characterized by X-ray diffraction, scanning electron microscopy, and reflected light microscopy. Pretreatment products such as CuSO4, NaFe3(SO4)2(OH)6, and S0 were identified although with difficulty, due to the low presence of chalcopyrite in the initial sample (1.99%). Under the conditions of 15 kg/t of H2SO4, 25 kg/t of NaCl, and 15 days of curing time, a copper extraction of 93.1% was obtained at 90 °C with 50 g/L of Cl− and 0.2 M of H2SO4.

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Characterization of electroosmotic drainage: application to mine tailings and solid residues from leaching

Cited by 21 publications

References 49 publications

Electroosmotic Dewatering of Iron Ore Tailings: A Laboratory Study to Improve Geotechnical Properties

Electroosmotic Dewatering of Iron Ore Tailings: A Laboratory Study to Improve Geotechnical Properties

A Network Model for Electroosmotic and Pressure-Driven Flow in Porous Microfluidic Channels

Pretreatment to Leaching for a Primary Copper Sulphide Ore in Chloride Media

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