Leaching Behavior of Heavy Metals from Pb–Zn Tailings and Remediation by Ca- or Na-Montmorillonite

Wang, Guifang; Cao, Wensheng; Liang, Guangchuan; Xiang, Jie; Chen, Yanli; Liu, Haiyan

doi:10.1007/s11270-023-06116-y

Cited by 6 publications

(3 citation statements)

References 43 publications

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“…For instance, Zhao [46] et al found that at an initial concentration of 1.6g/L of montmorillonite and 100 ppm Sr 2+ concentration, the Sr 2+ removal rate was only 27.15%. Wang [47] et al investigated the fixation behaviour of natural Ca-montmorillonite and Na-montmorillonite on heavy metals in tailings, and the results showed that the fixation of Pb 2+ was around 5% and 50%, respectively. Similarly, in this study, as shown in Figure 3a, under conditions where the initial Pb 2+ concentration was 327.4 mg/L, the maximum removal rate of Pb 2+ by montmorillonite was only 35.30%.…”

Section: Montmorillonite Structure and Adsorption Propertiesmentioning

confidence: 99%

“…Modification and intercalation of montmorillonite are currently key research areas which have demonstrated a marked enhancement in the adsorption ability of montmorillonite through these processes. For example, Wang [47] et al found that the removal efficiency of Pb 2+ and Mn 2+ increased from about 5% and 8% initially to 80% and 28%, respectively, after montmorillonite was modified by Na 2 CO 3 . Ma [55] et al found that montmorillonite modified with sodium lignosulfonate could increase the adsorption of Pb 2+ from an initial 40 mg/g to about 52.5 mg/g, while the adsorption of Cu 2+ increased from an initial 6.5 mg/g to about 7.5 mg/g.…”

Section: Performance Evaluation Of Mmt-cmb System For Heavy Metal Pol...mentioning

confidence: 99%

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Study on the Combined Behaviour of Montmorillonite and Carbonate Mineralizing Bacteria on Lead Retention and Fixation

Dai

Wang

et al. 2023

Minerals

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Heavy metal pollution management is a global environmental problem that poses a great threat to the ecological environment. Adsorption and biomineralization are considered to be the two most promising heavy metal pollution remediation techniques among the numerous available ones. In this work, a combined heavy metal removal system was constructed employing the adsorption of montmorillonite and the mineralization of carbonate mineralizing bacteria to expand their application potential for controlling heavy metal water pollution. Analysis of changes in pH, CO32− concentration, Pb2+ concentration in the liquid phase, and changes in microscopic morphology, mineral phase, and functional group on sedimentary minerals was done to study the retention and fixation behaviour of montmorillonite and carbonate mineralizing bacteria on Pb2+. The results show that the liquid phase pH may be slightly altered by the ions dissolved in montmorillonite. Based on the conditions of montmorillonite and carbonate mineralizing bacteria functioning separately, the elimination of Pb2+ may reach 35.31% and 45.75%, respectively. However, when montmorillonite is combined with carbonate mineralizing bacteria, which is the heavy metal removal system constructed in this study, montmorillonite can buffer part of the Pb2+ rapidly and reduce its biotoxicity. Subsequently, these buffered Pb2+ are gradually desorbed by carbonate mineralizing bacteria and removed by the effect of mineralized deposition. Results from SEM, FTIR, and XRD indicate that Pb2+ is primarily removed from the liquid phase as rod-shaped PbCO3. It is worth noting that this process is able to significantly increase the removal of Pb2+ up to 90.06%. In addition, the presence of carbonate mineralizing bacteria can increase montmorillonite’s desorption rate to over 81%, greatly enhancing its capacity for reuse. Therefore, our research work contributes to expanding the potential of montmorillonite and carbonate mineralizing bacteria in the treatment of heavy metal-polluted waters.

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Section: Montmorillonite Structure and Adsorption Propertiesmentioning

confidence: 99%

Section: Performance Evaluation Of Mmt-cmb System For Heavy Metal Pol...mentioning

confidence: 99%

Study on the Combined Behaviour of Montmorillonite and Carbonate Mineralizing Bacteria on Lead Retention and Fixation

Dai

Wang

et al. 2023

Minerals

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“…Furthermore, the storage and treatment of tailings require significant amounts of land and water resources; severe disturbances might be caused [2]. In order to minimize the detrimental impact of tailings on the environment, there is a great necessity to reduce or remove harmful substances from tailings [3,4], meanwhile ensuring by containment that they are safe and stable [5], reducing their impacts on both the ecosystem and human health. Therefore, it is of utmost importance that we urgently develop new technical approaches that make tailings reinforcement easy and efficient while remaining green and pollution-free, effectively reducing the environmental pollution risk associated with tailings.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of an Organic Matrix on Improving the Strength of Tailings Strengthened by MICP

Hu,

Zheng,

et al. 2023

Materials

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In order to improve the effect of microbial-induced calcium carbonate precipitation (MICP) in tailings reinforcement, sodium citrate, an organic matrix with good water solubility, was selected as the crystal form adjustment template for inducing calcium carbonate crystallization, and the reinforcements of tailings by MICP were conducted in several experiments. The effects of sodium citrate on the yield, crystal form, crystal appearance, and distribution of calcium carbonate were analyzed by MICP solution test; thus, the related results were obtained. These showed that the addition of a proper amount of organic matrix sodium citrate could result in an increment in the yield of calcium carbonate. The growth rate of calcium carbonate reached 22.6% under the optimum amount of sodium citrate, and the crystals of calcium carbonate were diverse and closely arranged. Based on this, the MICP reinforcement test of tailings was carried out under the action of the optimum amount of sodium citrate. The microscopic analysis using CT and other means showed that the calcium carbonate is distributed more uniformly in tailings, and the porosity of samples is significantly reduced by layered scanning analysis. The results of triaxial shear tests showed that adding organic matrix sodium citrate effectively increased the cohesion, internal friction angle, and peak stress of the reinforced tailings. It aims to provide a novel idea, a creative approach, and a method to enhance the reinforcement effect of tailings and green solidification technology in the mining environment.

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A critical review on the migration and transformation processes of heavy metal contamination in lead-zinc tailings of China

Chen,

Wen,

Zhou

et al. 2023

Environmental Pollution

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Leaching Behavior of Heavy Metals from Pb–Zn Tailings and Remediation by Ca- or Na-Montmorillonite

Cited by 6 publications

References 43 publications

Study on the Combined Behaviour of Montmorillonite and Carbonate Mineralizing Bacteria on Lead Retention and Fixation

Study on the Combined Behaviour of Montmorillonite and Carbonate Mineralizing Bacteria on Lead Retention and Fixation

Experimental Study on the Effect of an Organic Matrix on Improving the Strength of Tailings Strengthened by MICP

A critical review on the migration and transformation processes of heavy metal contamination in lead-zinc tailings of China

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