Synthesis of tailing slurry-based geopolymers for the highly efficient immobilization of heavy metals: Behavior and mechanism

Jiang, Jie; Luo, Haohao; Wang, Shufei; Ou, Xiaoduo; Su, Jian; Lyu, Zhengfan; Chen, Junlin; Wei, Dengtao

doi:10.1016/j.clay.2023.107199

Cited by 7 publications

(1 citation statement)

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“…When exceeding a certain limit, a large number of cracks will be generated inside CTB, which will reduce CTB's compressive strength. The stronger the acid/alkaline environment is, the more obvious the effect of acid erosion/alkaline erosion, and the shorter time for the UCS to reach the peak [35].…”

Section: The Uniaxial Compressive Strength Of Ctbmentioning

confidence: 99%

Study on the Long-Term Durability and Leaching Characteristics of Low-Consumption Cement Backfill under Different Environmental Conditions

Wang,

Xing,

Yang

et al. 2024

Sustainability

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The high consumption and high cost of cement are the bottleneck problems that limit the development of cemented tailings backfilling technology. The low-consumption cement backfill is immersed in a weak acid/alkaline groundwater environment for a long time. Reducing the consumption of cement can easily lead to problems such as a sudden decrease in strength and the leakage of heavy metals. Through the monolithic leaching test in static and uniaxial compressive tests, the heavy metals’ leaching concentration and the compressive strength of low-consumption cement backfills in different pH soaking solutions were measured at different soaking times. Results show that a lower cement concentration will result in a lower CTB compressive strength and a higher rate of heavy metal leaching. Long-term exposure to an acidic/alkaline environment will lead to the instability and destruction of the CTB structure. A microscopic examination reveals that the creation of hydration products can improve the structure’s compactness while also lowering the internal porosity of CTB but can also solidify heavy metal ions in various ways. A first-order reaction/diffusion model (FRDM) can better evaluate the leaching behavior of CTB. This study helps to improve backfilling technology, thereby contributing to the creation of sustainable mining geotechnologies.

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Section: The Uniaxial Compressive Strength Of Ctbmentioning

confidence: 99%