Detoxification of lead-bearing zinc plant leach residues from Kabwe, Zambia by coupled extraction-cementation method

Silwamba, Marthias; Ito, Mayumi; Hiroyoshi, Naoki; Tabelin, Carlito Baltazar; Fukushima, Tetsuya; Jeon, Sanghee; Igarashi, Toshifumi; Satō, Tsutomu; Nyambe, Imasiku; Chirwa, Meki; Banda, Kawawa; Nakata, Hokuto; Nakayama, Shouta M.M.; Ishizuka, Mayumi

doi:10.1016/j.jece.2020.104197

Cited by 58 publications

(22 citation statements)

References 69 publications

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“…These results suggest that most of the toxic and hazardous elements detected by XRF are likely hosted by sulfide minerals in the MT sample. Even in minor to trace amounts, sulfide minerals play crucial roles in the mobility of environmentally regulated elements like As, Cd, Cu and Zn as noted by several authors ( Kamata and Katoh, 2019 ; Mar et al., 2013 ; Silwamba et al., 2020a , b ; Tabelin et al., 2010 , 2012d ; 2014b ; 2017b ). Kamata and Katoh (2019) , for example, reported that the release of As and heavy metals like Cu, Zn and Pb from marine sedimentary rocks is strongly influenced by the oxidation of sulfide minerals and the subsequent precipitation of iron-oxyhydroxides.…”

Section: Resultsmentioning

confidence: 94%

Synthesis and characterization of coal fly ash and palm oil fuel ash modified artisanal and small-scale gold mine (ASGM) tailings based geopolymer using sugar mill lime sludge as Ca-based activator

Opiso

Tabelin

Maestre

et al. 2021

Heliyon

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The continuous accumulation of artisanal and small-scale gold mining (ASGM) tailings in the Philippines without adequate storage and disposal facility could lead to human health and environmental disasters in the long run. In this study, ASGM tailings was simultaneously stabilized and repurposed as construction material via geopolymerization using coal fly ash, palm oil fuel ash and a powder-based alkali activator. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) identified iron sulfides in the tailings containing arsenic (As), cadmium (Cd), copper (Cu), lead (Pb) and zinc (Zn), which could be released via weathering. The average unconfined compressive strengths (UCS) of tailings-based geopolymers at 14 days curing were 7.58 MPa and 7.7 MPa with fly ash and palm oil fuel ash, respectively. The tailings-based geopolymers with palm oil fuel ash had higher UCS most likely due to CASH reaction product formation that improved strength formation. The toxicity characteristic leaching procedure (TCLP) results showed very low leachabilities of As, Pb and Fe in the geopolymer materials suggesting ASGM tailings was effectively encapsulated within the geopolymer matrix. Overall, the geopolymerization of ASGM tailings is a viable and promising solution to simultaneously stabilize mining and industrial wastes and repurpose them into construction materials.

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Section: Resultsmentioning

confidence: 94%

Synthesis and characterization of coal fly ash and palm oil fuel ash modified artisanal and small-scale gold mine (ASGM) tailings based geopolymer using sugar mill lime sludge as Ca-based activator

Opiso

Tabelin

Maestre

et al. 2021

Heliyon

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“…Sequential extraction is a widely used technique to identify the solid-phase partitioning of trace contaminants in soils ( Tabelin et al., 2014a ; Tack and Verloo, 1995 ), sediments ( Huyen et al., 2019a , b ; Tack and Verloo, 1995 ; Tabelin et al., 2012b ), rocks ( Clevenger, 1990 ), underground tunnelling wastes ( Tamoto et al., 2015 ), hydrometallurgical residues ( Silwamba et al., 2020 ) and mine tailings ( Anju and Banerjee, 2010 ). In this study, the sequential extraction procedure was based on the earlier works of Marumo et al.…”

Section: Methodsmentioning

confidence: 99%

Solid-phase partitioning and release-retention mechanisms of copper, lead, zinc and arsenic in soils impacted by artisanal and small-scale gold mining (ASGM) activities

et al. 2020

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“…In both cases, the results showed that the effects of Fe ions on Au recovery were negligible. This could be explained by the very low solubility of Fe ions under basic conditions [31]; hence, Fe precipitates are readily formed in the solution, which neither favors nor hinders Au recovery. The precipitate in the solution was analyzed by SEM-EDX and showed that Fe precipitates were formed in the solution as shown in Figure 4c.…”

Section: Recovery Of Au Ions With Varying Fe Co Ni and Zn Concentrations In The Solutionmentioning

confidence: 99%

The Effects of Coexisting Copper, Iron, Cobalt, Nickel, and Zinc Ions on Gold Recovery by Enhanced Cementation via Galvanic Interactions between Zero-Valent Aluminum and Activated Carbon in Ammonium Thiosulfate Systems

Jeon

Bright

Park

et al. 2021

Metals

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The use of galvanic interactions between zero-valent aluminum (ZVAl) and activated carbon (AC) to recover gold (Au) ions is a promising technique to overcome the challenges due to the poor recovery in ammonium thiosulfate systems, but the applicability to practical Au ore processing remains elusive so far. The present study describes (1) the recovery of Au ions from low Au concentrations, which are typical concentrations used in Au ore processing; and (2) an investigation into the effects of various coexisting base metal ions that can be present in pregnant ore-leached solutions. The results showed that high Au recovery (i.e., over 85%) was obtained even at low Au concentrations under the following conditions: 1:1 of 0.15 g of ZVAl and AC with 10 mL of ammonium thiosulfate solution containing 5 mg/L of Au ions at 25 °C for 1 h in an anoxic atmosphere. Selected coexisting metal ions (i.e., copper, iron, cobalt, nickel, and zinc) were studied to establish their effects on Au recovery, and the results showed that the Au recovery was enhanced (about 90%) when copper ions coexist in the solution with minimal effects from other competing base metal ions.

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Detoxification of lead-bearing zinc plant leach residues from Kabwe, Zambia by coupled extraction-cementation method

Cited by 58 publications

References 69 publications

Synthesis and characterization of coal fly ash and palm oil fuel ash modified artisanal and small-scale gold mine (ASGM) tailings based geopolymer using sugar mill lime sludge as Ca-based activator

Synthesis and characterization of coal fly ash and palm oil fuel ash modified artisanal and small-scale gold mine (ASGM) tailings based geopolymer using sugar mill lime sludge as Ca-based activator

Solid-phase partitioning and release-retention mechanisms of copper, lead, zinc and arsenic in soils impacted by artisanal and small-scale gold mining (ASGM) activities

The Effects of Coexisting Copper, Iron, Cobalt, Nickel, and Zinc Ions on Gold Recovery by Enhanced Cementation via Galvanic Interactions between Zero-Valent Aluminum and Activated Carbon in Ammonium Thiosulfate Systems

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