scholarly journals Recovery of Copper from Leached Tailing Solutions by Biosorption

Minerals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 158 ◽  
Author(s):  
Sonia Cortés ◽  
Elizabeth E. Soto ◽  
Javier I. Ordóñez
Keyword(s):  
Acid Leaching ◽  
Operational Parameters ◽  
Kinetics Of Adsorption ◽  
The North ◽  
Low Concentrations ◽  
Gold Silver ◽  
Refractory Composition ◽  
Composition Of Minerals ◽  
Solid Liquid ◽  
Solid Liquid Separation

Due to the progressive fall of the ore grades and the increasingly refractory composition of minerals, concentrating plants have increased which has led to an increase in the generation of tailings. Tailings, especially those obtained in the past, have remaining copper and other valuable species in quantities that can potentially be recovered, such as gold, silver, vanadium, and rare earth elements which transforms this abundant waste into a potential source of precious or strategic metals for secondary mining. One of the techniques of solid–liquid separation that processes solutions with low concentrations of metals corresponds to adsorption, and more recently biosorption, which is based on the use of biological matrices that do not constitute an environmental liability after application. Biosorption occurs as a consequence of the wide variety of active functional groups present in different types of biomass. Bacterial, fungal, plant, and algal biomasses have been described as biosorbents, mainly for the treatment of diluted and simple solutions. This work aims to recover copper from leached tailings using biomass of the red algae Gracilaria chilensis as a biosorbent. The tailing samples were taken from an abandoned deposit, in the north of Chile, and after an acid leaching copper was biosorbed, kinetics of adsorption and the equilibrium isotherms were studied, applying the Freundlich and Langmuir models. Operational parameters such as adsorbent dose, pH, and initial metal concentration were studied.

scholarly journals Recovery of Copper from Leached-Tailing Solutions by Biosorption

2020 ◽  
Author(s):  
Sonia Cortés ◽  
Elizabeth E. Soto ◽  
Javier I. Ordóñez
Keyword(s):  
Acid Leaching ◽  
Operational Parameters ◽  
Economic Activities ◽  
Kinetics Of Adsorption ◽  
The North ◽  
Gold Silver ◽  
Refractory Composition ◽  
Composition Of Minerals ◽  
Solid Liquid ◽  
Solid Liquid Separation

Mining is one of the main economic activities of several developing countries as Chile. Due to the progressive fall of the ore grades and the increasingly refractory composition of minerals, concentrating plants have increased that has led to an increase in the generation of tailings. Tailings, especially those obtained in the past, have remaining copper and other valuable species in quantities that can potentially be recovered, such as gold, silver, vanadium and rare earth elements. This transforms this abundant waste into a potential source of precious or strategic metals for secondary mining. One of the techniques of solid-liquid separation that allows the processing of solutions with low concentrations of metals corresponds to the adsorption, and more recently the biosorption, which is based on the use of biological matrices that do not constitute an environmental liability after application. Biosorption occurs as a consequence of the wide variety of active functional groups present in the different types of biomass. Bacterial, fungal, plant and algal biomasses have been described as biosorbents, mainly for the treatment of diluted and simple solutions. This work aims to recover copper from leached tailings using biomass of the red algae Gracilaria chilensis as a biosorbent. The tailing samples were taken from an abandoned deposit in the north of Chile and after an acid leaching copper was biosorbed, for which the kinetics of adsorption and the equilibrium isotherms were studied, applying the Freundlich and Langmuir models. Operational parameters such as adsorbent dose, pH and initial metal concentration were studied.

Recovery of cobalt from spent lithium ion batteries using sulphuric acid leaching followed by solid–liquid separation and solvent extraction

RSC Advances ◽  
2016 ◽  
Vol 6 (88) ◽  
pp. 85303-85311 ◽  
Author(s):  
Feng Wang ◽  
Rong Sun ◽  
Jun Xu ◽  
Zheng Chen ◽  
Ming Kang
Keyword(s):  
Solvent Extraction ◽  
Lithium Ion Batteries ◽  
Sulphuric Acid ◽  
Precious Metal ◽  
Acid Leaching ◽  
Lithium Ion ◽  
Liquid Separation ◽  
Solid Liquid ◽  
Solid Liquid Separation

Herein, the method of hydrometallurgy is adopted to recycle the precious metal cobalt in spent lithium ion batteries (LIBs).

Pilot scale evaluation on ferric floc sludge concentration with pelleting flocculation blanket process

2010 ◽  
Vol 62 (9) ◽  
pp. 2021-2027
Author(s):  
Huang Ting-lin ◽  
Zhang Gang ◽  
Guo Ning ◽  
He Wen-jie ◽  
Han Hong-da ◽  
...  
Keyword(s):  
Flow Rate ◽  
Pilot Scale ◽  
Operational Parameters ◽  
Experimental Conditions ◽  
High Efficient ◽  
High Turbidity ◽  
Solid Liquid ◽  
Solid Liquid Separation ◽  
The Relationship ◽  
Sludge Concentration

Pelleting flocculation blanket (PFB) process has been successfully applied to high turbidity suspensions for high efficient solid/liquid separation. In this paper, by using the PFB process, a dynamic experimental study was carried out on concentrating ferric flocs sludge with a scale of 1.3–5.4 m3/h. The pilot experiment aimed to optimize the conditioning system and determine the operational parameters. Under the raw sludge concentrations of 103–1,154 mg/L, the system could achieve ideal conditioning effect with polyacrylamide (PAM) dosages of 0.3–2.7 mg/L, agitation speed of 10 rpm, and water up-flow rates of 18–48 m/h. Under the experimental conditions, the increase of polymer dosage would improve effluent turbidity and pellets settling behaviour, the moderate up-flow rate had no marked effect on treatment results, while too large surface loading could worsen effluent turbidity. The experimental results also revealed that there existed an approximately linear relationship between the raw sludge concentration and optimum PAM dosage, that is, the optimum dosage of PAM increased synchronously as the raw sludge concentration increased. While the relationship between the raw sludge concentration and maximum up-flow rate reflected another linear dependence, namely, the maximum up-flow rate would decreased linearly as the raw sludge concentration increased.

scholarly journals Reaction Mechanism of Simultaneous Removal of H2S and PH3 Using Modified Manganese Slag Slurry

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1384
Author(s):  
Jiacheng Bao ◽  
Xialing Wang ◽  
Kai Li ◽  
Fei Wang ◽  
Chi Wang ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Liquid Phase ◽  
Metal Ions ◽  
Acid Leaching ◽  
Promoting Effect ◽  
Simulation Experiments ◽  
Waste Solid ◽  
Manganese Slag ◽  
Solid Liquid ◽  
Solid Liquid Separation

The presence of phosphine (PH3) and hydrogen sulfide (H2S) in industrial tail gas results in the difficulty of secondary utilization. Using waste solid as a wet absorbent to purify the H2S and PH3 is an attractive strategy with the achievement of “waste controlled by waste”. In this study, the reaction mechanism of simultaneously removing H2S and PH3 by modified manganese slag slurry was investigated. Through the acid leaching method for raw manganese slag and the solid–liquid separation subsequently, the liquid-phase part has a critical influence on removing H2S and PH3. Furthermore, simulation experiments using metal ions for modified manganese slag slurry were carried out to investigate the effect of varied metal ions on the removal of H2S and PH3. The results showed that Cu2+ and Al3+ have a promoting effect on H2S and PH3 conversion. In addition, the Cu2+ has liquid-phase catalytic oxidation for H2S and PH3 through the conversion of Cu(II) to Cu(I).

Nitrogen Removal in a Real-Time Controlled Sequencing Batch Membrane Bioreactor

2010 ◽  
Vol 5 (3) ◽  
Author(s):  
Cheng-Nan Chang ◽  
Li-Ling Lee ◽  
Han-Hsien Huang ◽  
Ying-Chih Chiu
Keyword(s):  
Real Time ◽  
Nitrogen Removal ◽  
Membrane Bioreactor ◽  
Synthetic Wastewater ◽  
Real Time Control ◽  
Time Control ◽  
Cake Layer ◽  
On Line ◽  
Solid Liquid ◽  
Solid Liquid Separation

The performance of a real-time controlled Sequencing Batch Membrane Bioreactor (SBMBR) for removing organic matter and nitrogen from synthetic wastewater has been investigated in this study under two specific ammonia loadings of 0.0086 and 0.0045g NH4+-N gVSS−1 day−1. Laboratory results indicate that both COD and DOC removal are greater than 97.5% (w/w) but the major benefit of using membrane for solid-liquid separation is that the effluent can be decanted through the membrane while aeration is continued during the draw stage. With a continued aeration, the sludge cake layer is prevented from forming thus alleviating the membrane clogging problem in addition to significant nitrification activities observed in the draw stage. With adequate aeration in the oxic stage, the nitrogen removal efficiency exceeding 99% can be achieved with the SBMBR system. Furthermore, the SBMBR system has also been used to study the occurrence of ammonia valley and nitrate knee that can be used for real-time control of the biological process. Under appropriate ammonia loading rates, applicable ammonia valley and nitrate knee are detected. The real-time control of the SBMBR can be performed based on on-line ORP and pH measurements.

Investigations on the filtration of natural aquatic suspensions supported by dosing small amounts of Fe(III)-salts (βFe ≤ 0.1 mg.L-1): mode of action and basic design criteria

2002 ◽  
Vol 2 (2) ◽  
pp. 91-98
Author(s):  
R. Winzenbacher ◽  
R. Schick ◽  
H.-H. Stabel ◽  
M. Jekel
Keyword(s):  
Large Scale ◽  
Suspended Solids ◽  
Iron Hydroxides ◽  
Essential Step ◽  
Iron Salts ◽  
Alkaline Earths ◽  
Co Precipitation ◽  
Solid Liquid ◽  
Solid Liquid Separation

Improved removal of particles during the treatment of natural aquatic suspensions has been achieved by pre-ozonation and the addition of small quantities of iron salts (βFe ≤ 0.1 mg.L-1; “Fe(III)-assisted filtration”) followed by rapid filtration. As shown by investigations on a large-scale installation at Lake Constance Water Supply, this procedure reliably reduces suspended solids by at least 2-3 powers of ten in long-term use. However, the high efficacy of Fe(III)-assisted filtration cannot be explained on the basis of known coagulation mechanisms (like adsorption-charge neutralization, co-precipitation). Instead, the essential step was found to be the conditioning of the filter medium by coating it with colloids containing Fe(OH)3, and this “Fe coating” process occurs only in the presence of alkaline earths (especially Ca2+). According to further experiments, the enhanced solid-liquid separation was ultimately traced to chemical interactions such as the formation of calcium-organic association structures between the iron hydroxides and other solids. For design of Fe(III)-assisted filtration steps, finally, a βCa/DOC ratio above 40 mg.mg-1 and pre-oxidation with ozone dosages not exceeding 2 mg O3/mg DOC was recommended.

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