Experimental study on thermal and mechanical properties of tailings-based cemented paste backfill with CaCl2·6H2O/expanded vermiculite shape stabilized phase change materials

Zhang, Xiaoyan; Ke, Yaping; Du, Qiangqiang

doi:10.1007/s12613-022-2503-7

Cited by 7 publications

(2 citation statements)

References 36 publications

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“…The results showed that the addition of paraffin resulted in the loss of backfill soil structure, and decreased thermal conductivity, density and compressive strength, but effectively improved the thermal properties of the filling material, such as specific heat capacity and heat storage capacity. Other scholars have prepared composite phase-change materials using CaCl 2 •6H 2 O/expanded vermiculite [10], paraffin (PA)/expanded graphite (EG) [11] and decanoic acid/lauric acid [12], and have reached similar conclusions.…”

Section: Introductionmentioning

confidence: 74%

Experimental Study on Mechanical and Thermal Properties of Backfill Body with Paraffin Added

Zhang,

Han,

Liu

et al. 2023

Energies

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Based on phase-change heat storage backfill, paraffin microcapsules were selected as the phase change material and were directly mixed with backfill materials for preparing backfill specimens. The mechanical and thermal properties of specimens with different paraffin percentages and slurry concentrations were tested and analyzed. The results show that compressive strength gradually decreases with an increasing paraffin percentage while it significantly increases with increasing slurry concentration, thermal conductivity decreases with increasing paraffin percentage and specific heat capacity increases with an increasing paraffin percentage and slurry concentration. For a paraffin percentage from 0% to 10%, compressive strength decreases by an average of 22.5%, thermal conductivity decreases by an average of 43.8% and specific heat capacity increases by an average of 8.7% at a phase-change temperature of 30 °C. For a slurry concentration from 68% to 72%, compressive strength increases by an average of 4.12 times, and specific heat capacity increases by an average of 3.5% at a phase-change temperature of 30 °C. The weakening effect of phase-change materials on compressive strength can be effectively improved by the increase of slurry concentration, and the increases of paraffin percentage and slurry concentration can both improve the sensible heat storage capacity of backfill materials.

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Section: Introductionmentioning

confidence: 74%

Experimental Study on Mechanical and Thermal Properties of Backfill Body with Paraffin Added

Zhang,

Han,

Liu

et al. 2023

Energies

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“…However, the remaining mining waste after treatment with various additives is depleted of heavy metals and has strong intermolecular bonds and therefore is very stable and impervious to atmospheric conditions. Remediation of these materials as construction or backfill materials [44,45] can prevent environmental damage and reduce the costs of the transportation and storage of potentially harmful materials [46][47][48].…”

Section: Environmental Considerationsmentioning

confidence: 99%

Feasibility of Recovering Valuable and Toxic Metals from Copper Slag Using Iron-Containing Additives

Mitrašinović,

Yuankun,

Stopic

et al. 2023

Metals

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One of the greatest environmental challenges in metal extraction is the generation of a large amount of slag. Most of these slags contain insufficient amounts of valuable metals for economical revalorization, but these concentrations may be harmful for the environment. At present, more than 80% of the global copper products are obtained by the smelting process, where the major by-products are various slags containing a broad range of almost all known elements. In this study, valuable and potentially harmful elements were recovered from mining waste using gravity separation and gravity settling. The settling process was enhanced by injecting coke, ferrocarbon, ferrosilicon, and ferrosulfide. In total, 35 elements were detected in the samples using electron probe microanalysis. After the treatment, 89.4% of the valuable, toxic, and trace elements gathered in the newly formed matte after maintaining the copper slag for four hours at 1300 °C and adding ferrosilicon. The metallic constituents of slags could be an important source of raw materials and they could be considered an environmentally beneficial source of copper and other materials. Suggested practices can prevent harmful elements from entering the environment, generate value from the gathered metals, and make the remaining slag suitable for construction or mine backfill materials. The present article also assesses the challenges in slag processing by the pyrometallurgical route and provides a roadmap for further investigations and large-scale studies.

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Paraffin–CaCl2·6H2O dosage effects on the strength and heat transfer characteristics of cemented tailings backfill

Li,

Jin,

Chen

et al. 2024

Int J Miner Metall Mater

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Experimental study on thermal and mechanical properties of tailings-based cemented paste backfill with CaCl2·6H2O/expanded vermiculite shape stabilized phase change materials

Cited by 7 publications

References 36 publications

Experimental Study on Mechanical and Thermal Properties of Backfill Body with Paraffin Added

Experimental Study on Mechanical and Thermal Properties of Backfill Body with Paraffin Added

Feasibility of Recovering Valuable and Toxic Metals from Copper Slag Using Iron-Containing Additives

Paraffin–CaCl2·6H2O dosage effects on the strength and heat transfer characteristics of cemented tailings backfill

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