Separation and stabilization of arsenic in copper smelting wastewater by zinc slag

Duan, Xiaoxu; Li, Xuezhu; Li, Yongkui; Qi, Xianjin; Li, Guohua; Lu, Zhixu; Yang, Nina

doi:10.1016/j.jclepro.2021.127797

Cited by 42 publications

(8 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…No diffraction peaks of scorodite or iron arsenate were detected in XRD analysis, probably because the low crystallinity of the iron arsenate precipitate or the weaker signal of amorphous iron arsenate were shielded by gypsum. These findings are consistent with the results of Duan and Li [ 26 , 43 ]. The difference is that the diffraction peaks of scorodite were observed in the precipitation of the reaction for 12 h by Li et al, indicating that the formation of scorodite crystals takes some time; however, in our study, the formation of scorodite was not observed, which may be caused by the different reaction conditions.…”

Section: Resultssupporting

confidence: 93%

“…As the reaction proceeded, the band width gradually decreased, indicating an increase of crystallinity. The As–O–Fe bidentate–binuclear coordinating to ferrihydrite is attributed to this band, demonstrating arsenate adsorption on ferrihydrite [ 43 ]. A broad peak appeared at 1136 cm − 1 is assigned to structural SO 4 2- ions coordinating with CaSO4.2H 2 O or ferric sulfate compounds [ 50 , 51 , 52 ].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Utilization of Lead Slag as In Situ Iron Source for Arsenic Removal by Forming Iron Arsenate

et al. 2022

View full text Add to dashboard Cite

In situ treatment of acidic arsenic-containing wastewater from the non-ferrous metal smelting industry has been a great challenge for cleaner production in smelters. Scorodite and iron arsenate have been proved to be good arsenic-fixing minerals; thus, we used lead slag as an iron source to remove arsenic from wastewater by forming iron arsenate and scorodite. As the main contaminant in wastewater, As(III) was oxidized to As(V) by H2O2, which was further mineralized to low-crystalline iron arsenate by Fe(III) and Fe(II) released by lead slag (in situ generated). The calcium ions released from the dissolved lead slag combined with sulfate to form well-crystallized gypsum, which co-precipitated with iron arsenate and provided attachment sites for iron arsenate. In addition, a silicate colloid was generated from dissolved silicate minerals wrapped around the As-bearing precipitate particles, which reduced the arsenic-leaching toxicity. A 99.95% removal efficiency of arsenic with initial concentration of 6500 mg/L was reached when the solid–liquid ratio was 1:10 and after 12 h of reaction at room temperature. Moreover, the leaching toxicity of As-bearing precipitate was 3.36 mg/L (As) and 2.93 mg/L (Pb), lower than the leaching threshold (5 mg/L). This work can promote the joint treatment of slag and wastewater in smelters, which is conducive to the long-term development of resource utilization and clean production.

show abstract

Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Utilization of Lead Slag as In Situ Iron Source for Arsenic Removal by Forming Iron Arsenate

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Whatever the technology used to process arsenic-containing sulfide concentrates of non-ferrous metals, a series of solid, liquid, and/or gaseous streams containing arsenic in varying amounts will be generated. Thus, it is usually required to condense and stabilize it from gases [7][8][9][10][11][12], precipitate it from leaching solutions [13,14] or wastewaters [15][16][17], separate it from copper in smelter slag flotation [18], and/or minimize arsenic emissions to the atmosphere [19].…”

Section: Introductionmentioning

confidence: 99%

Behavior of As/AsxSy in Neutral and Oxidizing Atmospheres at High Temperatures—An Overview

Castro

Balladares

Jerez

et al. 2022

Metals

View full text Add to dashboard Cite

The reaction mechanisms in As and As-S systems during their oxidation and/or thermal decomposition are complex to describe due to the physicochemical characteristics of arsenic and its sulfides; the information highlighted in the literature was analyzed and correlated to determinate the predominant phases and reaction mechanisms during the thermal decomposition and oxidation of arsenic, in its elemental form and in sulfurate phases. As a result of this analysis, it was determined that the predominant phases are mainly composed of allotropies of arsenic, sulfides, and dimers. In addition, reaction mechanisms are provided that describe the behavior of arsenic and its sulfides during its thermal decomposition and oxidation.

show abstract

“…With a surface-exposed crystal population of both copper and copper oxides, CuNFs are thus able to simultaneously catalyze both oxygen evolution and oxygen reduction reactions. , This is of particular interest in the adsorptive reduction of heavy-metal oxyanions, where the dynamics of electron and hydrogen transfer are key to the metalloid capture pathway. ,− Arsenic water contamination, in particular, raises a worldwide concern for its high toxicity for concentrations above 10 μg·L –1 . , In this study, the removal of arsenic(V) [As(V)] from water by CuNFs by adsorption reduction was explored, with an initial ion concentration of 120 mg·L –1 simulating a severe groundwater contamination occurrence, a common adsorbent dose of 0.20 g·L –1 , and without the addition of electrolytes. , CuNFs were first found to exhibit ultrafast kinetics, reaching a capacity of 168 mg·g –1 after 60 s of contact, entailing the formation of a coprecipitate. A subsequent leg of chemisorption yielded up to 97% removal of As(V).…”

Section: Introductionmentioning

confidence: 99%

In Situ Growth of Cu/CuO/Cu₂O Nanocrystals within Hybrid Nanofibers for Adsorptive Arsenic Removal

Ligneris

Merenda

Chen

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Nanomaterials such as copper nanoparticles have attracted significant attention because of their interesting size-and shape-dependent properties. However, their increased instability remains a challenge. This study therefore focuses on the growth of copper/copper oxide nanocrystals within nanofiber scaffolds, achieved by thermal reduction of poly(vinyl alcohol) nanofibers cross-linked with copper(II) acetate. A reduction temperature of up to 800 °C in 15% H 2 balanced in N 2 was found to lead to the formation of copper-based nanofibers (CuNFs) of sub-250-nm diameter that presented a core−sheath morphology, resulting from copper efflorescence. Enrobing a hydrolysis-resistant polymer core, the sheath layer was found to be composed of a discrete distribution of polymer-embedded crystalline nanospheres with diameters below 20 nm and of round crystallites of up to 65 nm protruding at the surface of CuNFs. With a significant proportion in copper intermediary states, this heterogeneous material is promising for various applications benefiting from the surface reactivity and versatile efficiency from the simultaneous presence of a transition metal and transitionmetal oxide. For instance, with a material dose of 0.20 g•L −1 and an initial arsenic(V) concentration of 120 mg•L −1 , CuNFs yielded up to 96.5% arsenic(V) removal. This route for the manufacture of copper hybrid nanofibers can be adapted to other transition metals and blends.

show abstract

Separation and stabilization of arsenic in copper smelting wastewater by zinc slag

Cited by 42 publications

References 55 publications

Utilization of Lead Slag as In Situ Iron Source for Arsenic Removal by Forming Iron Arsenate

Utilization of Lead Slag as In Situ Iron Source for Arsenic Removal by Forming Iron Arsenate

Behavior of As/AsxSy in Neutral and Oxidizing Atmospheres at High Temperatures—An Overview

In Situ Growth of Cu/CuO/Cu₂O Nanocrystals within Hybrid Nanofibers for Adsorptive Arsenic Removal

Contact Info

Product

Resources

About

Separation and stabilization of arsenic in copper smelting wastewater by zinc slag

Cited by 42 publications

References 55 publications

Utilization of Lead Slag as In Situ Iron Source for Arsenic Removal by Forming Iron Arsenate

Utilization of Lead Slag as In Situ Iron Source for Arsenic Removal by Forming Iron Arsenate

Behavior of As/AsxSy in Neutral and Oxidizing Atmospheres at High Temperatures—An Overview

In Situ Growth of Cu/CuO/Cu2O Nanocrystals within Hybrid Nanofibers for Adsorptive Arsenic Removal

Contact Info

Product

Resources

About

In Situ Growth of Cu/CuO/Cu₂O Nanocrystals within Hybrid Nanofibers for Adsorptive Arsenic Removal