This mix proportion minimizes strength decline in coal gangue powder‐recycled aggregate concrete (CGP‐RAC) while maximizing recycled material replacement. Microscopic analysis revealed that CGP increased the Ca/Si ratio in cement paste, impeding hydration reactions, resulting in a looser internal structure and reduced concrete strength.
Fly ash is a fine powder recovered from gases created by the burning of coal. It is the largest component of coal combustion waste, totaling around 70 million tons annually in the United States ...
Based on the obtained results in comparison to the reference mix ( a mix containing limestone powder) the coal waste and its ash resulted in higher stability and resilient modulus. Furthermore, the combination of coal waste and limestone powders in equal proportion resulted in a desirable mix with high water resistance.
Coal mining. Mining operations can negatively impact water supplies, often with longlasting 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 happens when certain substances (typically ...
To accurately verify the effect of coal cuttings on waterbased polymer dril ling fluids, we add coal powders to the drilling fluid, and measure their performance after mixing the coal powders.
Inert powders played an important role in the explosion inhibition of dust removal equipment and coal gasification this paper, SiO 2, dry water, carrageenan dry water, and NaHCO 3 were adopted to explore the influences of inert powders on the deflagration flame propagation characteristics of mixed pulverized coal by a vertical pipeline. The results showed that the flame brightness ...
When water is adopted as the coal slag discharge medium in the process of drilling in soft coal seams, coal slurry with great agglomerated and viscous is formed after the water invades the coal powders. As the dry coal powders gradually mix with the wet coal slurry, the strength and consistency of the coal slurry will continue to be promoted.
Coal mine paste filling technology can effectively solve the problems caused by coal mining and is a key technology to realize green mining and is widely used in coal mining (Qi et al. 2019;;Qi2020). In coal mine paste filling technology, the performance of filling materials directly determines the filling effect of a coal mine ...
Utilization of iron coke hot briquette (ICHB), prepared by carbonizing coaliron ore composite agglomerate, is considered as an effective countermeasure to achieve low carbon emission blast furnace (BF) ironmaking. ICHB shows high reactivity and thereby presents low postreaction strength, which could have serious impact on the permeability of this paper, the effects of coal and iron ore ...
In addition, coal may be made into a coaloil mixture or coalwater mixture to replace petroleum. This type of technology is developing rapidly, with General Motors in the United States currently conducting research and experiments using 3 μm coal powder as automotive fuel. b Developing nuclear energy
Coal companies generally mix fine coal slime into commercial coal for sale, and some coal companies mix highash fine slime into coal gangue dumps. ... if each reagent has enough time to adsorb at the coalwater interface, a good flotation effect can be obtained. The addition sequence does not seem to be as important as it is considered in ...
Introduction In 2020, coal accounted for % of China's total energy consumption. Due to abundant resource reserves and technological advances, coal will still occupy a dominant position in the Chinese energy structure in the longterm.
A concrete mixer as shown in Fig. 2 (also commonly called a cement mixer) is a device that homogeneously combines cement with aggregates such as sand or gravel and water. A typical concrete mixer uses a revolving drum to mix the components. Internal blades are arranged in such a manner to lift and tumble the ingredients and direct the concrete into the circulatory path.
The CO present at the outlet of the decoupled NO removal reactor has a certain effect on the NO reduction effect of the coal char/coal char iron powder, ... The effect of adding water has little effect on CO production. ... Roles of oxygen and iron powder mixing could also be revealed. Herein, SEM images of coal char samples are taken before ...
Besides, an optimum mix with considerable water resistance was obtained by equal proportions of coal waste and limestone powders, while the CWP and particularly its ash resulted in a more sensitive mix to water [39]. A study by Xu et al. (2019) examined the effects of coal waste as filler on the functional characteristics of asphalt mastics and ...
On the basis of a variety of mixture models,, the PGM, the Tanaka formula, and the modes of operation shifts, mm fine coal and magnetite powder were uniformly mixed. According to analysis with highspeed dynamic camera technology, the mixing of fine coal and magnetite was controlled by lateral mixing and supplemented by axial mixing.
This invention relates to a mixed fuel comprising a coal powder or the like and heavy oil obtained by adding and mixing a dilute aqueous solution of a watersoluble highmolecular compound and a carbonaceous solid fuel powder such as coal powder or the like (hereinafter referred to as "coal powder and the like") to heavy oil so as to disperse the coal powder and the like and water (in very ...
1 Citations Metrics Abstract Watercoal interactions are dominant factors that affect water quality in coal mines. Using lixiviation, the effects of watercoal interactions on pH, salinity, and hazardous elemental enrichment in coal mine water and associated trends were simulated and analyzed.
Download Citation | Study on the effect of mixing water on coal mine filling cemented paste backfill performance under pHT coupling conditions | This research is aimed at the influence of...
Modarres et al. (2015) investigated the effect of coal waste powder on hot mix asphalt compared to conventional fillers (a combination of mechanical properties and environmental impacts). In this ...
Chlorides, sulfates, alkalis and solids in mixing water play a substantial role on quality and behavior of fresh and hardened fill from the cementtowater ratio and cement hydration points of view. Table 3 tabulates the chemistry of mixing water. To mix both coal fly ash and OPC, tap water as mixing water was only utilized in this study.
Numerical simulation has become a useful approach to explore the complex physical and chemical process inside the supercritical water (SCW) fluidized bed reactor. Due to the drastic and nonlinear variation of water properties near pseudocritical point, the flow field and drag coefficient of SCW flow past a cold particle are considerably different from that of conventional flow. Therefore, in ...
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