The bioaccumulation potential of heavy metals by Gliricidia sepium (Fabaceae) in mine tailings

Mussali-Galante, Patricia; Santoyo-Martínez, Miguel; Castrejón-Godínez, María Luisa; Bretón-Deval, Luz; Rodríguez-Solis, Alexis; Valencia-Cuevas, Leticia; Tovar-Sánchez, Efraı́n

doi:10.1007/s11356-022-24904-7

Cited by 6 publications

(2 citation statements)

References 51 publications

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“…The tailings used in the test were sourced from the dry bank of a tailing pond (Hengyang, China) in Hunan Province. The relative density of Gs is 2.499, with a natural dry density ρ = 1.539 g/cm 3 and a pore ratio of e = 0.78. Tailings were screened for particle size analysis, and the particle size distribution diagram of tailings was drawn, as shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

“…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%

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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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Section: Methodsmentioning

confidence: 99%