Waste valorization of coal mining waste from a circular economy perspective: A Brazilian case study based on environmental and physicochemical features

Acordi, J.; Simão, Lisandro; Faraco, M.N.S.; Borgert, Carlos Henrique; Olivo, Eduarda Fraga; Montedo, Oscar Rubem Klegues; Raupp-Pereira, F.

doi:10.1016/j.resourpol.2022.103243

Cited by 23 publications

(7 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The available part of silicon dioxide reacts with the hydration of the binder and promotes the formation of additional hydrosilicates [58]. The dependence of the flexural strength of the mortar (R M tb ) on the content of CD (%) presented in Figure 13 is described by a polynomial of the 4th degree: R M tb == 1.79 + 0.0300 x − 0.0036 x 2 − 0.00243 x 3 + 0.0001432 x 4 , R 2 = 0.96 (10) When replacing part of the cement in the mortar with CD in an amount of 2%, the flexural strength increases by 1.7%; when replacing 4%, it increases by 5.6%; and with 6%, 8% and 10% CD, the flexural strength decreases compared to the control composition by 4.4%, 9.4% and 19.4%, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…This problem is inherent in many countries and regions of the world where the mining industry is well developed. Enterprises and scientific institutes in such countries face a serious challenge in developing proposals at the fundamental and applied levels to study the possibility of using such coal dust [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…The use of coal dust in building materials and in particular in cement composites was considered in works [8][9][10]34]. Overall, the addition of coal dust in certain quantities can facilitate its efficient use in the production of cement and concrete and thus make a significant contribution to the sustainable development of the construction industry in terms of long-term energy savings, a reduction in greenhouse gas emissions and the mitigation of global climate change [8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Eco-Friendly Sustainable Concrete and Mortar Using Coal Dust Waste

Shcherban’,

Stel’makh,

Beskopylny

et al. 2023

Materials

View full text Add to dashboard Cite

Finding the solution to the problem of the accumulating waste from the mining and processing industries, as well as reducing their carbon footprint, is among the most important tasks today. Within the construction industry, in the field of the production of building materials such as concrete, these problems may be solved through the use of waste and by saving the binder component. The purpose of this study is to substantiate the feasibility of using waste coal dust (CD) in concrete and cement–sand mortars as a partial replacement for cement. Test samples were made by partially replacing cement with CD in an amount from 0% to 10% in increments of 2% by weight. The following main characteristics were studied: mobility and density of mixtures, as well as density, compressive strength, bending strength and water absorption of concrete and mortars. X-ray diffraction and microscopic analysis methods were used in this work. The introduction of CD to replace part of the cement, up to 10%, did not have a significant effect on the density of concrete and mortar mixtures but reduced their workability. The best values of physical and mechanical characteristics were recorded for concrete and mortar with 4% CD. The increases in the compressive strength of concrete and mortars were 6.6% and 5.7%, and in flexural strength 6.1% and 5.6%, respectively. Water absorption decreased by 9.7% for concrete and by 9.3% for mortar.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Eco-Friendly Sustainable Concrete and Mortar Using Coal Dust Waste

Shcherban’,

Stel’makh,

Beskopylny

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…The total storage capacity of coal gangue in China has exceeded 7 billion tons, and accumulating a large amount of coal gangue will bring severe environmental problems while occupying land resources [1,[4][5][6]. These environmental issues are of great concern in China and have gained widespread attention globally [7,8].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Gangue Slurry Deposition Behavior in Pipelines Considering Viscosity Change

Gu,

Wang,

et al. 2024

Minerals

View full text Add to dashboard Cite

Pipeline conveying is a crucial method for realizing gangue slurry filling. In order to avoid the blockage of gangue slurry in pipeline conveying, it is necessary to clarify the deposition behavior of gangue particles in the pipeline. This paper analyzes coal gangue’s microstructure and mineral composition in the Zhaozhuang No. 2 coal mine through electron microscope scanning and X-ray diffraction tests. We studied the viscosity characteristics of gangue slurry at different mass concentrations and particle sizes and analyzed the change rule of viscosity of gangue slurry with time. Based on determining the nature of the slurry material, a simulation analysis of the deposition behavior of the gangue slurry in a pipeline was carried out using the coupled fluid dynamics–discrete element (CFD-DEM) method. The results show that gangue slurry with a particle size larger than 1.0 mm is likely to lead to the blockage of the pipeline. A small increase in viscosity will promote a uniform distribution of particles inside the pipeline. The deposition behavior of particles is jointly influenced by gravity, fluid interaction force, inter-particle force, and the interaction between particles and the pipeline surface. The research results can be used as a reference for the design and study of gangue slurry grouting systems.

show abstract

“…At the same time, for numerous countries, especially those where coal mining is widely developed, there is a problem of the accumulation of coal dust in large quantities near populated areas. This problem increases the risk of environmental pollution and hinders the achievement of sustainable development goals [46,47].…”

Section: Introductionmentioning

confidence: 99%

Structural Formation and Properties of Eco-Friendly Foam Concrete Modified with Coal Dust

Stel’makh,

Shcherban’,

Beskopylny

et al. 2023

J. Compos. Sci.

View full text Add to dashboard Cite

Foam concrete is a popular energy-efficient construction material with a fairly wide range of usage in buildings and structures. Increasing ecological efficiency and reducing construction costs by the application of different types of industrial waste in the manufacturing technology of this composite is a promising direction. The main goal of this study is to investigate the possibility of coal dust (CD) waste inclusion in the technology of energy-efficient cellular concrete produced by foam concrete technology. Test samples of foam concrete were made using coal dust by partially replacing cement in the range of 0–10% in increments of 2%. The following primary characteristics of foam concrete were studied: fluidity of mixtures; compressive strength; density; thermal conductivity of foam concrete. An X-ray diffraction analysis of foam concrete composites was performed, which showed changes in their phase composition when using coal dust as a modifier. Coal dust in rational quantities from 2% to 6% improves the physical and mechanical characteristics of foam concrete and increases the structure uniformity. The optimal values of the foam concrete characteristics were recorded at a dosage of coal dust of 6%. At the same time, the density decreased by 2.3%, the compressive strength increased by 15.6%, and the thermal conductivity coefficient decreased by 8.9% compared to the ordinary composition. The use of the resulting foam concrete is advisable in enclosing structures to create high energy efficiency of buildings and structures due to the improved structure and properties.

show abstract

Waste valorization of coal mining waste from a circular economy perspective: A Brazilian case study based on environmental and physicochemical features

Cited by 23 publications

References 61 publications

Eco-Friendly Sustainable Concrete and Mortar Using Coal Dust Waste

Eco-Friendly Sustainable Concrete and Mortar Using Coal Dust Waste

Numerical Study of Gangue Slurry Deposition Behavior in Pipelines Considering Viscosity Change

Structural Formation and Properties of Eco-Friendly Foam Concrete Modified with Coal Dust

Contact Info

Product

Resources

About