Effect of activated coal mining wastes on the …
01.05.2012 · The water content at normal consistency for all the activated coal waste pastes followed the same pattern despite the variable origin of the ACW used. In general, the addition of activated tailings raised the water demand with respect to the control. Moreover, the higher the replacement ratio, the higher was the demand . Adding 10% ACW raised the water demand by 4.7%, while with a 20% …
Effect of activated coal mining wastes on the …
In this study, the effect of different coal mining wastes on the mechanical properties and microstructural development of alkali-activated materials (AAMs) was …
The Influence of Activated Coal Mining Wastes on …
In recent years, kaolinite‐based wastes are focusing the attention of researchers to obtain recycled metakaolinite, with consequent environmental and socioeconomic benefits. One of these lines of research is based on coal mining waste, which once activated thermally, it becomes a highly pozzolanic product (ACM ). This study reports the ...
Effect of activated coal mining wastes on the …
Effect of activated coal mining wastes on the properties of blended cement: Autor: Frías, Moisés; Sánchez de Rojas, María Isabel; Andrés, J.; Medina Martínez, César: Palabras clave: Coal waste Activation Pozzolan Blended cement Technical properties: Fecha de publicación: 2012: Editor: Elsevier: Citación: Cement and Concrete Composites ; 34 (5) : 678-683 (2012) Resumen: The large ...
The Influence of Activated Coal Mining Wastes on …
One of these lines of research is based on coal mining waste, which once activated thermally, it becomes a highly pozzolanic product (ACM). This study reports the influence of activated carbon mining waste on the formation and evolution of the mineralogical phases in the ACM/cement system as well as their influence on the microstructure up to 90 d of reaction. Mineralogical analyses clearly show …
Investigation of the effect of the coal wastes on …
10.04.2020 · Frias et al. investigated the effects of the three types of activated coal mining wastes (ACW) as the partial alternatives of the blended cement. They expressed that in the blended cements containing 10% and 20% ACW, the silico-aluminous nature of activated coal mining waste led to the higher contents of the silica and alumina in comparison with the ordinary Portland cement (OPC) and …
(PDF) The Influence of Activated Coal Mining …
The activated coal mining waste showed better performance, reaching similar strength to control mortar, better pore size refinement and an important reduction in mean pore size of 60% compared to...
Reactivity activation of waste coal gangue and its …
20.02.2020 · In Europe, as a whole, 175 million tons of coal waste have been stocked in dumps for decades. In Spain, 2.2 million tons of coal mining by-products were produced in 2009 . Common practices for disposing of the coal gangue is by spreading and landfilling. However, many research projects and practices have found that direct covering of soil is ...
Influence of temperature and chemistry actived …
The large volumes of coal waste generated world-wide in mining operations are mostly deposited in refuse dumps, to the severe detriment of the surrounding groundwater and soil.
Mining Waste - an overview | ScienceDirect Topics
Mining Waste. Mining wastes include hard rocks, gravels, clays, pebbles, sands, limestones, chalks, siftings of fine fractions, dump tailings of flotation concentration of ferrous and nonferrous metal ores, sulfur ores, apatite-nepheline concentrates, coal wastes, halite flotation wastes, screenings of phosphorite, phosphoric ore fines, etc.
Freeze-thaw effect on the durability of binary …
30.11.2018 · The starting coal waste presented aluminosilicate properties. • Once the waste had been activated, the presence of kaolinite was not identified. • The addition 20% ACW to the blended cement has an influence on the hydrated phases. • After 300 freeze/thaw cycles, the 20% ACW mortar presented a higher resistance. •
The Challenges of Reusing Mining and Mineral …
10.08.2012 · Mining and mineral-processing wastes are one of the world’s largest chronic waste concerns. Their reuse should be included in future sustainable development plans, but the potential impacts on a number of environmental processes are highly variable and must be thoroughly assessed. The stone composition and geotechnical properties of the source rock determine which uses are …
The Transformation of Coal-Mining Waste Minerals in the ...
matrices containing activated coal-mining waste, providing useful results for future research. However, performance criteria at the percentages of coal-mining waste that they added and its activation conditions still require further research. Currently, studies in …
Effect of Pre-oxidation on the Properties of …
The influence of a pre-oxidation process on the stone properties of crushed bituminous coal and on adsorption properties of the subsequently formed char and activated carbon is discussed in this paper. Datong bituminous coal samples sized 6 mm were oxidized at different temperatures and for different times and then carbonized and activated by steam to obtain activated carbons. A Uniform ...
(PDF) Coal mining waste management and its …
01.01.2010 · Sulfidic coal mining wastes constitute one of the the major global bulk waste stream and are extensively reused in engineering constructions. Occurrence in the waste …
Freeze-thaw effect on the durability of binary …
The starting coal waste presented aluminosilicate properties. Once the waste had been activated, the presence of kaolinite was not identified. The addition 20% ACW to the blended cement has an influence on the hydrated phases. After 300 freeze/thaw cycles, the 20% ACW mortar presented a …
Coal and Water Pollution | Union of Concerned …
Coal mining. Mining operations can negatively impact water supplies, often with long-lasting effects. The fundamental issue involves contamination of nearby rivers, lakes, and aquifers by what comes out of a coal mine—usually highly acidic water containing heavy metals like arsenic, copper, and lead. The process is known as acid mine drainage.It happens when certain substances (typically ...
Health and environmental impact of the coal …
The health and environmental impact of the coal industry includes issues such as land use, waste management, water and air pollution, caused by the coal mining, processing and the use of its products.In addition to atmospheric pollution, coal burning produces hundreds of millions of tons of solid waste products annually, including fly ash, bottom ash, and flue-gas desulfurization sludge, that ...
EFFECT OF AN ACTIVATING AGENT ON THE …
effect of an activating agent on the transformation of coal waste into a supplementary cementing material: kinetic parameters and heat evolution Abstract Over the last years, an important research line based on the recycling of kaolinite-based wastes has arisen …