Acid rain-dependent detailed leaching characteristics and simultaneous immobilization of Pb, Zn, Cr, and Cd from hazardous lead-zinc tailing

Wang, Haojie; Ju, Chenxuan; Zhou, Min; Chen, Jiaao; Kan, Xiaoqing; Dong, Yiqie; Hou, Haobo

doi:10.1016/j.envpol.2022.119529

Cited by 33 publications

(5 citation statements)

References 34 publications

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“…This happens because the amorphous silica and alumina framework within the matrix can dissolve when the protons (H + ) in the acid react with the Si–O–Si and Al–O–Si bonds in the structure . Several factors, including the type and concentration of acid, temperature, composition, and structure of the AAMs, can affect the degree of leaching. , However, traced Al concentration (16 mg/L) in water is not considered a serious concern to human health and the environment, as it falls under the non-enforceable guidelines established by the US EPA for regulating contaminants…”

Section: Resultsmentioning

confidence: 99%

“…36 Several factors, including the type and concentration of acid, temperature, composition, and structure of the AAMs, can affect the degree of leaching. 37,38 However, traced Al concentration (16 mg/L) in water is not considered a serious concern to human health and the environment, as it falls under the non-enforceable guidelines established by the US EPA for regulating contaminants. 39 Contrastingly, sulfur (S) leaching was much faster, reaching the maximum of 31 mg/L in 7 days of 4A-specimen, i.e., 75CMT+25MK, immersed in an acidic solution.…”

Section: Leaching Analysismentioning

confidence: 99%

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Sustainable Alkali-Activated Mortars for the Immobilization of Heavy Metals from Copper Mine Tailings

Maqbool,

Mobili,

Blasi

et al. 2023

ACS Sustainable Resour. Manage.

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This study demonstrates a successful approach for immobilizing heavy metals in alkali-activated mortars (AAMs) by incorporating copper mine tailings (CMTs) and metakaolin (MK) as potential sources of aluminosilicates. Leachate concentrations of hazardous elements from AAM specimens were investigated up to 63 days of immersion in different solutions (pH = 4.5 and 7.0) using the static monolithic leaching method. Statistical analysis revealed that heavy metals such as Fe, Cu, Pb, and Cd were effectively immobilized in AAMs, contributing to the goal of mitigating environmental pollution. Moreover, the leaching of S was the highest in an acidic solution after 7 days (31 mg/L), while Si showed the highest concentration in an acidic solution after 28 days (18 mg/L). Sulfur exhibited a mean interval flux higher than those of Si and Al, indicating its faster release from AAMs. Although some elements were detected in relatively high concentration, such as Al in an acidic solution (16 mg/L), they fall within the non-enforceable guidelines set by the US Environmental Protection Agency (EPA), revealing that the manufactured AAMs can meet regulatory requirements. EDXS, FTIR, and XRD analyses provided valuable insights into the surface, chemical, and structural stabilities of AAMs, as well as the influence of pH, the presence of CMTs and MK, and the release of alkaline residues on leaching behavior.

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Section: Resultsmentioning

confidence: 99%

Section: Leaching Analysismentioning

confidence: 99%

Sustainable Alkali-Activated Mortars for the Immobilization of Heavy Metals from Copper Mine Tailings

Maqbool,

Mobili,

Blasi

et al. 2023

ACS Sustainable Resour. Manage.

View full text Add to dashboard Cite

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“…Zinc's leaching kinetics are driven by reaction because it has a higher reaction rate and chemical retardation than those of other heavy metal elements. This poorer immobilization efficiency is a result of Zinc's higher reaction rate [56].…”

Section: Discussionmentioning

confidence: 99%

Study on the Long-Term Durability and Leaching Characteristics of Low-Consumption Cement Backfill under Different Environmental Conditions

Wang,

Xing,

Yang

et al. 2024

Sustainability

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The high consumption and high cost of cement are the bottleneck problems that limit the development of cemented tailings backfilling technology. The low-consumption cement backfill is immersed in a weak acid/alkaline groundwater environment for a long time. Reducing the consumption of cement can easily lead to problems such as a sudden decrease in strength and the leakage of heavy metals. Through the monolithic leaching test in static and uniaxial compressive tests, the heavy metals’ leaching concentration and the compressive strength of low-consumption cement backfills in different pH soaking solutions were measured at different soaking times. Results show that a lower cement concentration will result in a lower CTB compressive strength and a higher rate of heavy metal leaching. Long-term exposure to an acidic/alkaline environment will lead to the instability and destruction of the CTB structure. A microscopic examination reveals that the creation of hydration products can improve the structure’s compactness while also lowering the internal porosity of CTB but can also solidify heavy metal ions in various ways. A first-order reaction/diffusion model (FRDM) can better evaluate the leaching behavior of CTB. This study helps to improve backfilling technology, thereby contributing to the creation of sustainable mining geotechnologies.

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“…Concerning soils subjected to simulated rainwater leaching, most researchers focus on changes in element speciation before and after leaching [ 20 ]. Wang et al [ 21 ] conducted leaching experiments on lead–zinc tailings using simulated acid rain. They found that the concentration of Cr in the leachate was only 20 mg/L, which was lower compared to the concentrations of other heavy metals in the leachate.…”

Section: Introductionmentioning

confidence: 99%

The Release and Migration of Cr in the Soil under Alternating Wet–Dry Conditions

Chen,

Liang

et al. 2024

Toxics

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In recent decades, chromium contamination in soil has emerged as a serious environmental issue, demanding an exploration of chromium’s behavioral patterns in different soil conditions. This study aims to simulate the release, migration, and environmental impact of chromium (Cr) in contaminated soils under natural rainfall conditions (wet–dry cycles). Clean soils sourced from Panzhihua were used to cultivate chromium-containing soils. Simulated rainfall, prepared in the laboratory, was applied to the cultivated chromium-containing soils in indoor simulated leaching experiments. The experiments simulated three years of rainfall in Panzhihua. The results indicate that soils with higher initial Cr contents result in higher Cr concentrations in the leachate, but all soils exhibit a low cumulative Cr release. The leachate shows similar patterns in total organic carbon (TOC), pH, electrical conductivity, and Cr content changes. An analysis of the speciation of Cr in the soil after leaching reveals a significant decrease in the exchangeable fraction for each Cr species, while the residual and oxidizable Cr fractions exhibit notable increases. The wet–dry cycle has the following effects on the soil: it induces internal reduction reactions in the soil, leading to the reduction of Cr(VI) to Cr(III); it alters the binding of Cr ions to the soil, affecting the migration of chromium; and it involves microorganisms in chemical processes that consume organic matter in the soil. After three years of rainwater leaching, chromium-containing soils released a relatively low cumulative amount of total chromium, resulting in a reduced potential risk of groundwater system contamination. Most of the chromium in the chromium-containing soil is fixed within the soil, leading to less biotoxicity.

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Acid rain-dependent detailed leaching characteristics and simultaneous immobilization of Pb, Zn, Cr, and Cd from hazardous lead-zinc tailing

Cited by 33 publications

References 34 publications

Sustainable Alkali-Activated Mortars for the Immobilization of Heavy Metals from Copper Mine Tailings

Sustainable Alkali-Activated Mortars for the Immobilization of Heavy Metals from Copper Mine Tailings

Study on the Long-Term Durability and Leaching Characteristics of Low-Consumption Cement Backfill under Different Environmental Conditions

The Release and Migration of Cr in the Soil under Alternating Wet–Dry Conditions

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