Immobilization of Cu(II) and Zn(II) in simulated polluted soil using sulfurizing agent

Wang, Xinyang; Wei, Dezhou; Mi, Jinyue; Shen, Yanbai; Cui, Baoyu; Han, Cong

doi:10.1016/j.cej.2015.04.106

Cited by 25 publications

(7 citation statements)

References 31 publications

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“…Factually, it is not fully advisable that the flotation response is an absolute positive correlation with its sulfidization extent. It is well known that copper and lead oxide minerals, except zinc oxide minerals, after treatment with Na 2 S can be well collected by xanthate 5 , 35 . The poor zinc recovery is mainly ascribed to a terrible surface sulfidization of ZnO mineral in the pulp.…”

Section: Resultsmentioning

confidence: 99%

Formation of zinc sulfide species during roasting of ZnO with pyrite and its contribution on flotation

Zheng

Wang

et al. 2018

Sci Rep

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In this paper, formation of zinc sulfide species during roasting of ZnO with FeS2 was investigated and its contribution on flotation was illustrated. The evolution process, phase and crystal growth were investigated by thermogravimetry (TG), X-Ray diffraction (XRD) along with thermodynamic calculation and scanning electron microscopy-Energy-dispersive X-ray spectroscopy (SEM-EDS), respectively, to interpret the formation mechanism of ZnS species. It was found that ZnS was initially generated at about 450 °C and then the reaction prevailed at about 600 °C. The generated FexS would dissolve into ZnS and then form (Zn, Fe)S compound in form of Fe2Zn3S5 when temperature increased to about 750 °C. This obviously accelerated ZnS phase formation and growth. In addition, it was known that increasing of ZnO dosage had few effects on the decomposition behavior of FeS2. Then, flotation tests of different zinc oxide materials before and after treatment were performed to further confirm that the flotation performances of the treated materials could be obviously improved. Finally, a scheme diagram was proposed to regular its application to mineral processing. It was systematically illustrated that different types of ZnS species needed to be synthetized when sulfidization roasting-flotation process was carried out to treat zinc oxide materials.

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Section: Resultsmentioning

confidence: 99%

Formation of zinc sulfide species during roasting of ZnO with pyrite and its contribution on flotation

Zheng

Wang

et al. 2018

Sci Rep

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“…Meanwhile, soil contamination with toxic heavy metals derived from anthropogenic activities such as smelting of metals and the use of metal‐containing products including pesticides and paint is a worldwide problem and requires increasingly high‐level attention . Heavy metals accumulation, which may cause long‐term risk to the environment and human beings, is not easy to remove or degrade from soil . Therefore, it is essential to implement effective and economical technologies to treat contaminations in both wastewater and contaminated soil.…”

Section: Introductionmentioning

confidence: 99%

“…1 Heavy metals accumulation, which may cause long-term risk to the environment and human beings, is not easy to remove or degrade from soil. 2 Therefore, it is essential to implement effective and economical technologies to treat contaminations in both wastewater and contaminated soil.…”

Section: Introductionmentioning

confidence: 99%

“…In soil, if PO 4 3− can be released from struvite which formed in the process of nutrients recovery from wastewater, heavy metals immobilization may be achieved by formation of metal‐phosphate, and a ‘bridge’ between wastewater treatment and soil remediation will be constructed. According to Equation , high alkalinity is beneficial to dissolution of struvite, and OH − can react with Mg 2+ easier than PO 4 3− . Hence, PO 4 3− may be released from struvite for heavy metals immobilization when plant ash is mixed with plant ash to increase pH of soil.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and optimization of struvite recovery from wastewater and reusing for heavy metals immobilization in contaminated soil

Wang

et al. 2016

J of Chemical Tech & Biotech

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BACKROUND Few studies have been carried out to connect nutrients recovery from wastewater and heavy metals immobilization in contaminated soil. To achieve the goal, ammonia nitrogen (AN) and phosphorus (P) were recovered from rare‐earth wastewater by using the formation of struvite, which was used as the amendment with plant ash for copper, lead and chromium immobilization. RESULTS AN removal efficiency and residual P reached 95.32 ± 0.73% and 6.14 ± 1.72 mg L−1 under optimal conditions: pH=9.0, n(Mg): n(N): n(P) = 1.2:1:1.1, which were obtained using response surface methodology (RSM). The minimum available concentrations of Cu, Pb and Cr (CPC) separately reduced to 320.82 mg kg−1, 190.77 mg kg−1 and 121.46 mg kg−1 with increasing immobilization time at the mass ratio of phosphate precipitate (PP)/plant ash (PA) of 1:3. Humic acid (HA) and fulvic acid (FA) were beneficial to immobilize Cu, both of which showed no effect or even a negative effect on Pb and Cr immobilization. CONCLUSION Building up a suitable ‘bridge’ to connect and achieve recovery of nutrients and reuse of struvite. © 2016 Society of Chemical Industry

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“…Currently, stabilization technology is one of the most cost-effective methods for pollution control of heavy metals contaminated soil (Cao, et al, 2009b, Liu, et al, 2015. Materials containing phosphorus, sulfur and iron are the common stabilizer for the heavy metals in soil (Bolan, et (Cao, et al, 2003, Basta and McGowen, 2004, Brown, et al, 2004, Cao, et al, 2009b, and especially exhibit the strongest stability for Pb; sulfur-containing materials can not only immobilize Pb, Zn, Cu and Cd, but also As in soil by forming arsenic sulfide precipitation (Hartley, et al, 2004, Liao, et al, 2005, Hinckley, et al, 2011.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Single and Composited Stabilizers on Enhancing Stability of Multiple Metals in Mine Soil

Xu¹,

Zhang²,

Cheng³

et al. 2017

dteees

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Abstract. The soil pollution is getting worse with the rapid development of industry in recent years, Heavy metals can ultimately affect human health through the food chain. So immobilization of heavy metals in soil is of great significance. Here, six single stabilizer and six composite stabilizers, including CaO, bone char (BC), Na 2 S, calcium superphosphate (SSP), sodium diethyldithiocarbamate (DDTC-Na) and FeSO 4 , were investigated to immobilize heavy metals and As in mine soil. Toxicity Characteristic Leaching Procedure (TCLP) was adopted to evaluate the stabilization effectiveness of the stabilizers on Pb, Zn, Cu, Cd and As, and the best stabilizers for simultaneously immobilizing Pb, Zn, Cu, Cd and As in soil were selected based on the TCLP results. The results in this study provide useful information for remediation of heavy metals contaminated soil.

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Immobilization of Cu(II) and Zn(II) in simulated polluted soil using sulfurizing agent

Cited by 25 publications

References 31 publications

Formation of zinc sulfide species during roasting of ZnO with pyrite and its contribution on flotation

Formation of zinc sulfide species during roasting of ZnO with pyrite and its contribution on flotation

Modeling and optimization of struvite recovery from wastewater and reusing for heavy metals immobilization in contaminated soil

Effectiveness of Single and Composited Stabilizers on Enhancing Stability of Multiple Metals in Mine Soil

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