Effects of free lime content in fly ash on sulfate expansion of cement–fly ash mixtures

Visvalingam, Sharaniya; Saengsoy, Warangkana; Tangtermsirikul, Somnuk

doi:10.1007/s10163-022-01460-3

Cited by 12 publications

(1 citation statement)

References 32 publications

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“…In recent years, researchers have combined the reuse of solid waste with backfilling and mining to develop new filling materials such as tailings [8], fly ash [9][10][11][12][13], coal gangue [14][15][16][17][18] and coal gasification slag [6,[19][20][21]. The reuse of solid waste can alleviate the cost pressure of backfill mining to a large extent, but most solid waste materials (tailings, coal gangue and coal gasification slag, etc.)…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Study on the Improvement of Gangue/Tailing Cemented Fill by Bentonite: Flow Properties, Mechanical Properties and Permeability

Wang,

Chen,

Guo

et al. 2023

Materials

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Backfill mining has significant advantages in safe mining, solid waste utilization and ecological environmental protection, but solid waste materials (tailings, gangue and coal gasification slag, etc.), as derivative residues of the chemical and metallurgical industries, contain a large number of heavy metal elements, which is posing great challenges to the underground environment after backfill. In order to study the feasibility of bentonite for reducing the permeability of gangue/tailing sand cemented backfill body, relevant tests were carried out from the basic performance index, flow performance and mechanical properties of paste backfill materials. The test results show that bentonite has a significant effect on the water secretion rate of cemented fillers, and also promotes the improvement of slump and diffusion diameter of backfill slurry. The enhancement effect of mechanical properties in the early stage is not obvious, mainly concentrated in the middle and late stages of specimen curing. With the increase of bentonite content, the 28-day uniaxial compressive strength increased from 7.1 MPa and 7.9 MPa to 8.7 MPa and 9.0 MPa, respectively. Bentonite is filled between the pores of the cemented backfill with its fine particles and water swelling, which can reduce the porosity and permeability of the gangue and tailings cemented backfill. Therefore, on the premise of satisfying the flow and mechanical properties of paste backfill, bentonite can be used to improve the permeability of cemented backfill and reduce the leaching and migration of heavy metal ions.

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Section: Introductionmentioning

confidence: 99%

A Preliminary Study on the Improvement of Gangue/Tailing Cemented Fill by Bentonite: Flow Properties, Mechanical Properties and Permeability

Wang,

Chen,

Guo

et al. 2023

Materials

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Ecological treatment of El Kriymat boiler ash for recovering vanadium, nickel and zinc from sulfate leach liquor

Khalafalla

Abdellah

Khoziem

et al. 2022

J Mater Cycles Waste Manag

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The primary goal of this work is to develop a technology that allows for the recovery of metal values from waste products, thereby promoting the wise and efficient use of our nation's resources. To achieve this goal, an industrial waste of El Kriymat boiler fly Ash was used for recovering its content of vanadium, nickel and zinc. About 97, 95 and 99% respectively of these economic elements were first dissolved from boiler fly ash magnetic concentrate (after physical concentration). Leaching experiments using optimum conditions include: 180 g/L sulfuric acid concentration and 4% solid/solid proportion manganese dioxide acts as an oxidant at 80 °C. The recovery of vanadium (V) metal ions was carried out using 3% Alamine 336 in kerosene at an equilibrium pH value of 0.9. Subsequently, 15% sodium sulfide solution was used for co-precipitation of nickel and zinc metal ions in the raffinate solution at pH value of 3.5. Graphical Abstract

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Water retention property and microscopic mechanism of shallow soil in inner dump improved by fly ash and polyacrylamide

Wang,

Zhang

et al. 2024

Environ Monit Assess

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Effects of free lime content in fly ash on sulfate expansion of cement–fly ash mixtures

Cited by 12 publications

References 32 publications

A Preliminary Study on the Improvement of Gangue/Tailing Cemented Fill by Bentonite: Flow Properties, Mechanical Properties and Permeability

A Preliminary Study on the Improvement of Gangue/Tailing Cemented Fill by Bentonite: Flow Properties, Mechanical Properties and Permeability

Ecological treatment of El Kriymat boiler ash for recovering vanadium, nickel and zinc from sulfate leach liquor

Water retention property and microscopic mechanism of shallow soil in inner dump improved by fly ash and polyacrylamide

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