Leaching characteristics and stabilization of heavy metals in tin-polymetallic tailings by sodium diethyl dithiocarbamate intercalated montmorillonite (DDTC-Mt)

Wang, Guifang; Xiao, Huizhen; Liang, Guangchuan; Zhu, Jingyi; He, Chunlin; Ma, Shengqian; Zhang, Shuai; Komarneni, Sridhar

doi:10.1016/j.jclepro.2022.131041

Cited by 16 publications

(2 citation statements)

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“…Except for Cr, the released contents of Cd, Cu, Mn, and Ni followed the opposite trend to the pH values of the leaching solutions, where the pH of the solution decreased but the dissolution of PTMs increased, which is consistent with the results obtained by Wang et al and Zhang et al [ 49 , 58 ]. Low pH can actually weaken the strength of metal association and reduce the negative surface charge of organic matter and Fe-Mn-Al oxides [ 59 ], thereby causing the adsorbed PTMs to desorb into the leaching solutions and an increase in the released contents of PTMs in the leaching solutions.…”

Section: Resultssupporting

confidence: 90%

“…The potential for generating acid was greater for the waste slag than the sintered slag, probably due to the different properties of the slag samples. According to Table 1 , the sulfur content was greater in the waste slag than the sintered slag, and the sulfur content affected the pH of minerals and the potential to generate acid to a certain extent [ 38 , 48 , 49 ].…”

Section: Resultsmentioning

confidence: 99%

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Leaching Characteristics of Potentially Toxic Metals from Tailings at Lujiang Alum Mine, China

Zhou

Ren³

et al. 2022

IJERPH

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To investigate the leaching characteristics and potential environmental effects of potentially toxic metals (PTMs) from alum mine tailings in Lujiang, Anhui Province, soaking tests and simulated rainfall leaching experiments were conducted for two types of slag. PTMs comprising Cd, Cr, Cu, Mn, and Ni were detected in the slag. Cu and Cd contents exceeded the national soil risk screening values (GB 15618-2018). pH values of the two slag soaking solutions were negatively correlated with the solid:liquid ratio. pH values of the sintered slag soaking solutions with different solid:liquid ratios finally stabilized between 4.4 and 4.59, and those of the waste slag soaking solutions finally stabilized between 2.7 and 3.4. The concentrations of Cd, Cr, Cu, Mn, and Ni leached from waste slag were higher than those from sintered slag, and the dissolved concentrations of these PTMs in sintered slag were higher under rainfall leaching conditions than soaking conditions (the difference in Cr concentration was the smallest, 5.6%). The cumulative release of Cd, Cr, Cu, Mn, and Ni increased as the leaching liquid volume increased. The kinetic characteristics of the cumulative release of the five PTMs were best fitted by a double constant equation (R2 > 0.98 for all fits). Single factor index evaluations showed that Mn and Ni were the PTMs with high pollution degrees (Pi for Mn and Ni exceed 1) in the leaching solutions. However, considering the biotoxicity of PTMs, the water quality index evaluations showed that the water quality of the sintered slag soaking solution, the waste slag soaking solution, and the sintered slag leachate was good, poor, and undrinkable, respectively. The health risk assessment showed that the total non-carcinogenic risk (HI) values in adults for both the sintered slag leachate and waste slag soaking solution exceeded the safe level of 1, with HI values of 3.965 and 2.342, respectively. The hazard quotient (HQ) for Cd was 1.994 for the sintered slag leachate, and Cd and Cr make up 50.29% and 15.93% of the total risk, respectively. Cr makes up 28.38% of the total risk for the waste slag soaking solution. These results indicate a high non-carcinogenic risk of exposure to Cd and Cr in the leaching solution used for drinking purposes. These findings may provide a reference for the evaluation and ecological control of PTM pollution in alum mining areas.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%