Copper Extraction from Dilute Solutions by Cementation in a Gas-Sparged Helical Coil Reactor

Awaad, I; Nosier, S. A.; Hussein, Mohamed; ElNahrawy, Mohamed; Sedahmed, G.H.; Abdel‐Aziz, M.H.; El-Naggar, M.

doi:10.1007/s11837-021-05102-1

Cited by 4 publications

(4 citation statements)

References 32 publications

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“…Treatment group 5 had the smallest pH value, possibly because rice husk ash (RHA) in the dried sludge is rich in potassium (K), phosphorus (P), calcium (Ca), magnesium (Mg), and silicon (Si), among others chemical elements with moderate alkalinity (Yin et al, 2022). In addition, ferrous sulfate lowers the pH of the system; therefore, it is often used in combination with alkaline materials (Awaad et al, 2022).…”

Section: Effect Of Adding Stabilizers On the Physical And Chemical Pr...mentioning

confidence: 99%

In-situ stability assessment and remediation mechanism of typical antimony (Sb) tailings by combined organic-inorganic solid waste in Southwest China

Yang

Han

Luo

et al. 2022

Preprint

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To explore the feasibility of reusing solid waste to stabilize high-content antimony ore arsenic (As) and antimony (Sb) tailings, red mud, fly ash, dried sludge, ferrous sulfate (FeSO4), and rice husk ash were used as the stabilizer. Different combinations of stabilizers were used to stabilize the Sb tailings in Qinglong and Dushan. The morphological transformation and leaching characteristics of As and Sb in the treated tailing samples were determined. The results showed that the stabilizer was beneficial for adjusting the pH of the tailings and increasing the organic matter content. The combined treatment with 5% red mud, 10% fly ash, 5% dried sludge, 1% FeSO4, and 1% rice husk ash had the best stabilization effects on As and Sb. The best stabilization efficiencies of As and Sb in Dushan were 86.97% and 79.11%, respectively, and in Qinglong were 87.42% and 70.36%, respectively. The leaching concentrations of As and Sb decreased considerably under neutral conditions, promoting the transformation of As and Sb from exchangeable, oxidizable, and reducible states to the residue state. Furthermore, “Correlation heat maps” and X-ray diffraction (XRD) analyses were undertaken to evaluate the best performance of the stabilized samples, which is related to (1) the adsorption and precipitation mechanism of iron-aluminum (hydroxide) compounds in red mud and fly ash; (2) complexation and chelation of the rich organic matter; (3) the main hydration products calcium silicate hydrate (C-S-H), the As/Sb precipitation process and (4) the mechanism of pH inhibition by FeSO4.

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Section: Effect Of Adding Stabilizers On the Physical And Chemical Pr...mentioning

confidence: 99%

In-situ stability assessment and remediation mechanism of typical antimony (Sb) tailings by combined organic-inorganic solid waste in Southwest China

Yang

Han

Luo

et al. 2022

Preprint

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“…In the event of extremely exothermic reactions, this relatively quick cooling would prevent the heat-sensitive biomass from thermal damage. -By using diffusion-controlled cementation on a less noble metal, the rotating packed-bed reactor can be utilized to remove heavy metals from wastewater [27][28][29]. -By using catalytic wet oxidation, rotating-bed reactors can be utilized to remove organic contaminants from wastewater [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

“…By using diffusion‐controlled cementation on a less noble metal, the rotating packed‐bed reactor can be utilized to remove heavy metals from wastewater 27–29.…”

Section: Introductionmentioning

confidence: 99%

“…Another advantage of using the rotating packed bed as a biochemical reactor is the higher rate of heat transfer between the rotating bed and an outer cooling jacket (around the container) due to the combined effect of the high thermal conductivity of the catalyst support and the well‐stirred solution in the gap between the bed and the container wall, as a result of the interaction between the radial flow coming out of the rotating bed and the flow induced by the outer surface of the bed, which acts as a rotating cylinder. In the event of extremely exothermic reactions, this relatively quick cooling would prevent the heat‐sensitive biomass from thermal damage. By using diffusion‐controlled cementation on a less noble metal, the rotating packed‐bed reactor can be utilized to remove heavy metals from wastewater 27–29. By using catalytic wet oxidation, rotating‐bed reactors can be utilized to remove organic contaminants from wastewater 30–32. The current reactor can be utilized as a photocatalytic reactor to remove organic pollutants from wastewater; in this case, the Raschig rings will support the TiO 2 catalyst to eliminate the tedious downstream process of separating the TiO 2 powder from the treated solution, and the rotating bed will be surrounded by an array of vertical UV lamps. The expensive post‐recovery of the catalyst particles after water treatment is currently the key technological challenge preventing the commercialization of the photocatalytic stirred‐slurry reactor 33–36.…”

Section: Introductionmentioning

confidence: 99%

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Mass Transfer Behavior of a Rotating Packed Bed of Raschig Rings Suitable for Wastewater Treatment

et al. 2023

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The mass transfer behavior of a rotating packed bed of Raschig rings was examined to increase the rate of liquid-solid diffusion-controlled reactions common in the production of fine chemicals, pharmaceuticals, and wastewater treatment. The aim was to measure the enhancing effect of the centrifugal force and the high area per unit volume of the bed, using diffusion-controlled copper dissolution in acidified dichromate as the experimental approach and the bed rotation speed, the Raschig ring diameter, and the bed height as variables. A dimensionless mass transfer equation suited for scaling up and reactor design was used to correlate the data. Measurement of the specific mechanical power consumption e of the rotating bed under different conditions revealed that the energy utilization efficiency increases with decreasing bed rotation speed.

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Recovery of Lead and Zinc from Complex Industrial Waste of Zinc Process with Ammonium Acetate

Alkan

Rüşen

Topçu

2023

JOM

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Copper Extraction from Dilute Solutions by Cementation in a Gas-Sparged Helical Coil Reactor

Cited by 4 publications

References 32 publications

In-situ stability assessment and remediation mechanism of typical antimony (Sb) tailings by combined organic-inorganic solid waste in Southwest China

In-situ stability assessment and remediation mechanism of typical antimony (Sb) tailings by combined organic-inorganic solid waste in Southwest China

Mass Transfer Behavior of a Rotating Packed Bed of Raschig Rings Suitable for Wastewater Treatment

Recovery of Lead and Zinc from Complex Industrial Waste of Zinc Process with Ammonium Acetate

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