Using hazardous barium slag as a novel admixture for alkali activated slag cement

Huang, Xiao; Chen, Xin; Li, Jiangshan; Wang, Ping; Liao, Shuai; Poon, Chi Sun; Xue, Qi‐Kun

doi:10.1016/j.cemconcomp.2021.104332

Cited by 26 publications

(4 citation statements)

References 30 publications

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“…The leaching concentration of lead increased significantly with an increase in temperature, and the leaching concentration at 55 • C was about an order of magnitude higher than that at 25 • C. The concentration of lead ions declined slowly and then increased in the early stages of the semi-dynamic leaching test. This was mainly due to the uncertain replacement time of the leaching solution in the initial stages of the test, and the comprehensive influence of the mineral composition on the surface of the S/S monolith and the dissolution and diffusion of pollutants [8,9]. After 1 day of leaching, the concentration of heavy metals in the leaching solution showed a slow decreasing trend as the replacement time of the leachant became regular.…”

Section: Effect Of Temperature On Lead Ion Leachingmentioning

confidence: 99%

“…However, some countries, such as Denmark and South Korea, have rejected this technology due to the uncertainty of its long-term performance and durability [7]. The long-term effectiveness of S/S treatment technology has been a concern of scholars for a considerable time [4,8,9]. Exploring the long-term leaching behavior of heavy metals from S/S monoliths at different temperatures is of great significance for evaluating the long-term effectiveness of S/S treatment.…”

Section: Introductionmentioning

confidence: 99%

“…The most widely used of these are the diffusion model and the series of modified models based on the improvement of the diffusion model [10]. The leaching process of heavy metals in S/S monoliths is mainly controlled by diffusion, dissolution, and surface washing [8,16]. The main influencing factors in the leaching process include external factors and internal factors.…”

Section: Introductionmentioning

confidence: 99%

“…The main influencing factors in the leaching process include external factors and internal factors. The internal factors include pollutant type, concentration, curing agent, and pore structure, and the external factors mainly include pH, redox potential, temperature, and other environmental conditions [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Temperature on the Leaching Behavior of Pb from Cement Stabilization/Solidification-Treated Contaminated Soil

et al. 2022

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Solidification/stabilization (S/S) is one of the most widely used techniques in the disposal of heavy-metal-contaminated soil, though the long-term effectiveness of S/S technology remains implicit. Temperature is an important factor affecting the leaching behavior of heavy metals and the long-term effectiveness of S/S treatment. This study systematically explored the influence of temperature on the leaching behavior of lead in an S/S monolith through semi-dynamic leaching test at different temperatures. The results showed that an increase in temperature could accelerate the leaching concentration and cumulative leaching amount of lead ions in the S/S monolith. The cumulative leaching amount of lead ions in the S/S monolith after 11 days at 55 °C was about 5.8 times that at 25 °C. The leaching rate of lead ions in the S/S monolith increased with the increase in temperature. The leaching index of lead ions was larger than 9, which met the requirements for “controlled utilization” in the environment. The leaching mechanism of lead ions was diffusion control and did not change in the temperature range of 25–55 °C. These findings indicate that temperature affects the leaching behavior and the long-term effectiveness of S/S treatment, and temperature variation should be considered in the effectiveness evaluation of S/S treatment.

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Section: Effect Of Temperature On Lead Ion Leachingmentioning

confidence: 99%