This chapter contains the findings of the Subcommittee on Adsorption of the National Research Council's Safe Drinking Water Committee, which studied the efficacy of granular activated carbon (GAC) and related adsorbents in the treatment of drinking water. Some attention is given to an examination of the potential health effects related to the use of these adsorbents, but detailed toxicological ...
Several mechanisms were responsible for the NO x reduction, including lower flame temperature from the addition of the water, staged combustion from cofiring in lowNO x burners, and the CWM acting as a reburn fuel when injected in upper level burners.
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 ...
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.
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...
In a coal preparation plant, typical contaminants in the reused water are pyrite oxidation products (Fe 2+, Fe 3+ and SO 4 2−), soluble inorganic ions released from the inorganic matters in the coal (Ca 2+, Al 3+ and Mg 2+), humic acids and residual flotation reagents. These chemical species can have a profound effect on coal processing [[25 ...
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.
Hiremath and Yaragal [97] evaluated the effect of mixing method (threestage mixing vs. fourstage mixing), speed of mixing (25150 RPM) and time of mixing (1030 min) on RPC properties. The main ...
The results show that some parameters of the drilling fluid, including viscosity, lubrication coefficient, adhesion coefficient, contact angle, and surface tension, increase after adding coal...
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.
This paper determines the optimal surfactant concentration for enhancing coal's wettability and explores the wetting mechanism at surfactant concentrations above the critical micelle concentration (CMC) during coal seam water injection. In this study, laboratory experiments and field tests were used to investigate the influence of monomeric surfactants and compound surfactants at various ...
Based on the problems of high carbon emission and high cost of traditional mining methods and filling materials, the tailings powder modified Coal Ganguebased Cementitious Backfill Material (CGCBM) was used for paste filling mining. In this study, the samples were prepared with different tailings powder content and different curing ages.
After mixing different explosion suppressants with coal dust and testing the ignition temperature, it is found that when Al(OH) 3 is mixed with coal dust and the mass percentage is 60%, the coal ...
The generated waste is among the prominent 62 environmental problems. Fortunately, the washery rejects are used in many sectors 63 such as the construction industry, as underground backfill ...
The effect of addition sequence for mixed collectors comprising of dodecane(D) and nvaleric acid(A) on lowrank coal flotation was explored by the following three sequences: D first and then A(D + A), A first and then D(A + D), D and A were added simultaneously(M). The total organic carbon, contact angle, zeta potential, and Xray photoelectron spectroscopy results revealed that the coal had ...
When the coal powder is mixed in, hydrophilic minerals on the coal surface interact with the water in the water cores, causing some of the coal particles to enter the reverse micelles. As a result of this, the hydrophobic chain of Tween 80 reaches into the oil phase and the water core becomes a hydrated film on the surface of the coal particles ...
Synergistic effects of mixing waste activated carbon and coal in coslurrying and CO
Mangi SA, Wan Ibrahim MH, Jamaluddin N, Arshad MF, Ramadhansyah PJ (2019) Effects of ground coal bottom ash on the properties of concrete. J Eng Sci Technol 14(1):338350. ... Admilson J, Zhang W (2018) The effect of mixing and curing sea water on concrete strength at different ages. In: MATEC Web of Conferences, vol 142, pp 16.
Effect of coal waste powder in hot mix asphalt compared to conventional fillers: mix mechanical properties and environmental impacts ScienceDirect Journal of Cleaner Production Volume 91, 15 March 2015, Pages 262268
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]. ... Effect of coal waste powder in hot mix asphalt compared to conventional fillers: mix mechanical properties and environmental ...
Preparation of slurry. The slurrying experiments were performed by mixing the coal sample with 5%, 10%, 15%, and 20% (mass ratio of dry sludge to dry coal) modified sludge and sludge. The SCWS and modified sludge coal water slurry (MSCWS) were prepared using a dry slurrying process as follows.
As illustrated in Fig. 1, the whole briquettes production process involves mixing coal ash with pellet powder, blending water with the mixed powder, briquetting the final blended material, drying the green briquettes, preheating the dry briquettes and carbonizing the preheat briquettes. Bonding strength of different powder briquettes
The objective of this study was to investigate the influence of mixture composition and water content of the powders on mixing and mixture quality of three binary spice powder mixtures with significant differences in mixing behaviour. Furthermore, powder flowability of the mixture's constituents at various moisture contents were measured, as ...
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 ...
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