Analysis of leaching behavior and chemical speciation of heavy metals in a landfill of electrolytic manganese residue indicates that Mn, Co, As, and Cu within EMR pose a potential risk when this material is placed in landfills and should be given particular attention when managing the land disposal of EMR. ABSTRACT We analyzed the …
DetailsThis study provides novel insight into the leaching characteristics of Pb, Zn, As, and Mn from the Zn-Pb mine tailings and the immobilization performance of montmorillonite …
DetailsAging effect can influence the fractions distribution and mobility of metals after they are added into soil. In this study, incubation and soil column experiments under simulated acid rain condition were conducted to evaluate aging effect on the leaching characteristic of Cu, Zn, and Cd in artificial polluted red paddy soil.
DetailsFurther, heavy metal ions leaching behavior of SMS and mortars containing SMS were researched to evaluate the environmental risks during SMS utilization as SCMs. Section snippets Raw materials. Ordinary Portland cement P.O 42.5R (OPC) was supplied by Lafarge Cement Co., Ltd., Sichuan Province, China. Silicomanganese slag (SMS) …
DetailsAbstractThe heavy metals leaching potential of lime fly ash cements was evaluated for one low loss on ignition (LLOI) and one high loss on ignition ash (HLOI). ... Daniels, J., and Das, G. (2006). "Leaching behavior of lime-fly ash mixtures." Environ. Eng. Sci., 23(1), 42–52. Crossref. Google Scholar. Duchesne, J., and Reardon, E. J ...
DetailsThese samples were subjected to external attack posed by sodium and magnesium sulfate. The investigation encompassed a range of aspects, including mass and length changes, the evolution of strength, changes in phase assemblages, alterations in microstructure, and the leaching behavior of heavy metals.
DetailsIn contrast, Cr, Cu, and As were mostly present in residual speciation forms owing to their parasitism in quartz, sillimanite, and amorphous Fe solid solution in CGFA. Additionally, the study revealed that there was no significant relationship between heavy metal content, leaching behavior, and carbon content in CGFA.
DetailsThe leaching amounts of metals tended to decrease with increment of initial pH and leaching time, although some metal elements were also detected at alkaline conditions. Similar results were reported by Cappuyns and Swennen (2008). It is likely that iron phase precipitation occurs when the pH of a solution changes from acidic to neutral.
DetailsTotal heavy metal content (T) represents overall content in mg/kg. Available heavy metal content (A) represents maximum leachable fraction of the component. The available fraction was tested by available leaching test – NEN 7341 [17]. Heavy metal analysis was carried out by atomic absorption spectrophotometer (GBC Avanta, 13.1).
DetailsGiven the current research mainly focuses on the solidification of heavy metals in calcium sulfoaluminate cement in an ideal environment or a single environment, there still lacks of researches on the leaching behavior of heavy metal ions in harsh environments and their solidification capabilities and leaching mechanisms.
DetailsWith the extensive use of nonferrous metals and metal catalysts, solid wastes containing heavy metals release metal ions into soil and surface water through erosion and …
DetailsThe leaching mechanism of heavy metals can be assigned to chemical (mineral dissolution and effective amount of components) and physical (advection, surface …
DetailsThe leaching rates of Mn and Zn were much higher than the other Heavy metals. • The leaching results can be well fitted by the DoseResp model. • Heavy metals were accumulated in paddy soil under the impact of Pb–Zn mine tailings. • Ecological risks of heavy metals caused by Pb–Zn mine tailings cannot be ignored.
DetailsTherefore, this work aims to i) evaluate the difference in environmental pollution caused by heavy metals in NMT through R A C, I g e o, E F, and R I, and the four results are weighted to obtain a comprehensive pollution risk score result; ii) understand the static leaching behavior of Pb, Cd, Mn, Mo, Sr in NMT under different solid-liquid ...
DetailsHeavy metal ions (including Cu, Mn, Pb, Ni, Cr, Cd, V, Mo, Sb, and Se) leaching behavior of SMS powder under attacking of leaching solution with different pH were evaluated. This experiment set eight parallel tests by using leaching solutions with pH ranging from acid to alkaline. 1 mol/L HNO 3 and 0.5 mol/L NaOH was used to adjust …
DetailsRecycling of heavy metal contaminated river sludge into unfired green bricks: Strength, water resistance, and heavy metals leaching behavior – A laboratory simulation study Author links open overlay panel Yierfan Maierdan a b, Kang Gu a b, Bing Chen a b, M. Aminul Haque a b, Ying Zhang c, Ling Zhao c
DetailsIn order to evaluate the validity of the intraparticle pore-diffusion (intraPD) model, we simulated a heavy metal leaching test from soil consisting of 2 mm diameter particles under conditions outlined in Table 1 and Table 2.The simulation parameters were selected in accordance with prior research findings and Japanese standards, as detailed …
DetailsThe objectives of this study were to characterize the heavy metal contamination status of surface soils sampled at two dredged sediment land disposal sites (the Baimao and Kongwan landfills) in Meiliang Bay, Lake Taihu, China, as well as to investigate the effect on their leaching behaviors due to acid rain. Among all the …
Details2.2. Leaching tests and chemical analysis. The batch leaching test conducted in this study was performed using standard procedures prescribed by HJ/T 557–2010, which can simulate the process of tailings, soil, and sediment samples being leached into the environment by the surface and groundwater (Chinese Standard HJ …
DetailsAbstractThis study aimed to study the effects of different carbonation–hydration processes and carbonation degrees on the mechanical properties and leaching behavior of heavy metals in stainless steel (SS) slag paste. SS slag powders were carbonated at ...
DetailsLeaching behavior of MSWI ash can be influenced by ash properties such as the bulk content, particle size distribution, ... It was concluded that hundreds of pollutants are generated through leaching from MSWI ash, in which heavy metals and organic contaminants are the most toxic and concerned. Ash properties, pH and L/S ratio are the …
DetailsLeaching is defined as the process whereby a waste component is removed mechanically or chemically into a solution from a solidified matrix by the passage of solvent such as …
DetailsMINTEQ modeling for evaluating the leaching behavior of heavy metals in MSWI fly ash J Environ Sci (China). 2008;20(11):1398-402. doi: 10.1016/s1001-0742(08)62239-1. Authors Yan Zhang 1, Jianguo Jiang, Maozhe Chen. Affiliation 1 Department of …
DetailsNumerous studies have been carried out to investigate leaching behavior of heavy metals from mine tailings and their impacts under different rainfall conditions (Sun et al., 2022; …
DetailsThe leaching behaviour of heavy metal in cement-solidified MSWIFA was investigated. •. Pb leaching was mainly controlled by the diffusion mechanism. •. Long-term …
DetailsThe durability and heavy metal leaching behavior of red mud-class F fly ash based geopolymers (RFFG) were investigated in this study. RFFG specimens were soaked in sulfuric acid solutions (pH = 3.0) and deionized water (pH = 7.0) for 1–120 days, and then their remaining mechanical properties and the change in the microstructures …
Details[13] studied the leaching behavior of heavy metals in CGS based on the extraction procedure of leaching toxicity of solid waste. The leaching concentration of Cr exceeds the groundwater-related regulatory limit in China, and the potential adverse environmental effects of Cr in CGS should be noted. The aforementioned research has …
DetailsThe aim of this study was to assess the effect of pretreatment on volatilization and leaching behavior of heavy metals during thermal plasma melting fly ash, focusing on weight loss, volume reduction, residual fractions of target heavy metals and leaching behavior. In this paper, a 30-kW thermal direct current (DC) arc plasma …
DetailsThe leaching data for selected heavy metals (Ni, Cu, Zn and Pb) were elaborated with a diffusional leaching model based on penetration theory, which is aimed to identify the release mechanisms of these heavy metals and to predict the long-term leaching behavior of cement solidified sludge.
DetailsHeavy metals that leach from contaminated soils under acid rain are of increasing concern. In this study, simulated acid rain (SAR) was pumped through columns of artificially contaminated purple soil.
DetailsSite Ordovician limestone karst water plays a key role in the release of heavy metals from abandoned coal gangue or filled-in goafs in closed coal mines. In this study, a series of immersion experiments was performed to evaluate the leaching behavior of heavy metals in coal gangue from the Baizhuang coal mine in Shandong Province. …
DetailsMost of leached heavy metals are produced at early ages. The leaching concentration of heavy metals and leaching time has strong positive relationships. In factual utilizing circumstances, heavy metals' leaching from MSWI fly ash-cement hardened pastes is a very slow and gradually diluting process.
DetailsHowever, environmental risks from the leaching of toxic contaminants (mainly heavy metals and polycyclic aromatic hydrocarbons) that are components of industrial effluents, urban sources, human excreta and storm run-off and their bioavailability limits the reutilization of biosolids as soil amendments/conditioners (Chanaka Udayanga et al., …
DetailsMINTEQ model was used to simulate carbonation process and the form of product on MSWI fly ash carbonation technology study (Meima and van der Weijden, 2002); and it was also applied to simulate heavy metal leaching behavior and transfer behavior of solidified/stabilized fly ash (Li et No. 11 MINTEQ modeling for evaluating the leaching …
DetailsPE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
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