Integrated UF–NF–RO route for gold mining effluent treatment: From bench-scale to pilot-scale

Amaral, Míriam Cristina Santos; Grossi, Luiza B.; Ramos, Ramatisa L.; Ricci, Bárbara C.; Andrade, Laura Hamdan de

doi:10.1016/j.desal.2018.02.030

Cited by 52 publications

(11 citation statements)

References 24 publications

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“…The specific energy consumption SEC (kW h/m 3 ) of RO was defined as in eqs and . , Here, W represents the rate of work done by the pump (kW h/s), ΔP (N/m 2 ) represents the difference between the pressure of raw wastewater and the feed pressure at the entrance of membrane, Q f represents the feed flow rate (L/h), and Q p represents the permeate flow rate (L/h). A conversion factor 1 kW h/m 3 ≈ 3.6 × 10 6 Pa was computed in Pascal or kW h/m 3 .…”

Section: Methodsmentioning

confidence: 99%

Study on Recovering High-Concentration Lithium Salt from Lithium-Containing Wastewater Using a Hybrid Reverse Osmosis (RO)–Electrodialysis (ED) Process

Qiu

Ruan

Tang

et al. 2019

ACS Sustainable Chem. Eng.

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A novel industrial lithium-containing wastewater depth concentrating process integrating reverse osmosis (RO) and electrodialysis (ED) into a system is presented. A systematic analytical study was accomplished to optimize the studied parameters and minimize the energy consumption. The tested parameters were as follows: RO recovery by adding pressure, ED voltage drop, the concentration of RO retentate in ED feed solution, ED volume ratio, and ED operating mode. By using RO retentate instead of initial wastewater in the ED process, water energy consumption was reduced by 3.41 times from 26.67 to 7.81 kW h/m3, while optimizing the RO retentate concentration for the ED feed solution reduced the cost to 0.47 $/kg. The results showed that RO is crucial to preconcentrate lithium salt and save energy. Furthermore, the final LiCl concentration can approach as high as 87.09 g/L with the secondary ED process (V d:V c = 3:1), while the energy consumption can be saved as 7.71 kW h/m3 when the experiments stopped in region 1. The concentration factor of 12.32 can be achieved to justify the feasibility of integration of a high volume ratio concentrating with a mutistage concentrating protocol. As a consequence, the hybrid RO–ED process allows for lithium salt extraction and concentrating from industrial lithium-containing wastewater, which is appropriate for industrial applications.

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Section: Methodsmentioning

confidence: 99%

Study on Recovering High-Concentration Lithium Salt from Lithium-Containing Wastewater Using a Hybrid Reverse Osmosis (RO)–Electrodialysis (ED) Process

Qiu

Ruan

Tang

et al. 2019

ACS Sustainable Chem. Eng.

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“…Studies have been conducted also on membrane processes application to PLS from a pressure-oxidation (POX) of refractory gold ores [38,39]. POX represents a hydrometallurgical oxidation of concentrated ore pulp under high pressure (20 bar) and temperature (135-200 o C).…”

Section: Membrane Technologies For Pls Concentrationmentioning

confidence: 99%

Application of membrane processes in mining and mineral processing

Panayotova

Panayotov

2021

E3S Web Conf.

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Sustainable mining and mineral processing is of paramount importance for producing metals needed for our society development. Membrane processes are able to contribute to the comprehensive extraction of metals from mined ores, while at the same time decrease the amounts of used water and reagents and ensure discharge to the environment of wastewater meeting the legislation requirements. Membranebased technologies are still underused in metals obtaining although their development and price have made their application affordable. The paper presents in brief membrane processes and displays examples of their application in various areas of mining and mineral processing, such as coping with acid mine drainage and mine influenced water, recovery of metals, reagents and water in hydrometallurgy, recovery of lithium from brines, and treatment of wastewater. Emphasis is placed on pressure driven membrane processes, as well as on the very recent studies in the area. Advantages of membrane processes application in mining and mineral processing are pointed out as well as constrains to be overcome.

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“…A synthetic effluent was prepared based on concentration levels similar to those reported on the literature (Amaral et al, 2018). All reagents used were of analytical grade and were dissolved in ultrapure water (MilliQ).…”

Section: Synthetic Effluent Preparationmentioning

confidence: 99%

“…Usually, toxic compounds such as heavy metals, metalloids and acids are commonly found in their composition. One of the techniques commonly used in their treatment is the neutralization process, that uses alkalinizing reagents such as calcium carbonate, calcium oxide, calcium hydroxide, magnesium hydroxide or sodium hydroxide (Amaral et al, 2018). Even though it is considered a simple treatment process, it presents the disadvantage of sludge generation, which hamper metals and acid recovery that present an added value.…”

Section: Introductionmentioning

confidence: 99%

Metals Recovery From the Gold Pressure Oxidation Stage Effluent Using Solvent Extraction

Moreira¹,

Amaral²,

Lebron³

et al. 2019

Blucher Chemical Engineering Proceedings

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The gold mining, accompanied with the production increase, generates a large effluent amount throughout its process, resulting in several environmental impacts if not correctly destined. In this context, the solvent extraction emerges as an alternative to recover value-added compounds present in this effluent. In this work, Cyanex 272 was employed, in different aqueous/organic (A/O) ratios, to recover metals from a pressure oxidation stage synthetic effluent. The metals concentration in the aqueous phase was determined by atomic absorption spectroscopy. Distribution coefficient and separation factors were calculated. The highest concentration in the organic phase was iron due to the higher driving force for the extraction. The highest average removal was for manganese (40.8 %). Furthermore, the highest selectivity was obtained for the 2/1 A/O ratio, being the manganese the metal that presented greater selectivity against iron.

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Integrated UF–NF–RO route for gold mining effluent treatment: From bench-scale to pilot-scale

Cited by 52 publications

References 24 publications

Study on Recovering High-Concentration Lithium Salt from Lithium-Containing Wastewater Using a Hybrid Reverse Osmosis (RO)–Electrodialysis (ED) Process

Study on Recovering High-Concentration Lithium Salt from Lithium-Containing Wastewater Using a Hybrid Reverse Osmosis (RO)–Electrodialysis (ED) Process

Application of membrane processes in mining and mineral processing

Metals Recovery From the Gold Pressure Oxidation Stage Effluent Using Solvent Extraction

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