In mining, gangue (/ ɡ æ ŋ /) is the commercially worthless material that surrounds, or is closely mixed with, a wanted mineral in an ore is thus distinct from overburden, which is the waste rock or materials overlying an ore or mineral body that are displaced during mining without being processed, and from tailings, which is rock already stripped of valuable minerals.
WhatsAppعرض المزيدIn this paper, slag is used as a calcium source to make alkaliactivated coal gangue–slag (AACGS) based material. The reaction mechanism of AACGS materials was discussed in depth by means of XRD, FTIR, 29 Si MASNMR (nuclear magnetic resonance) and SEMEDS (energy dispersive spectrometer). The experimental results show that coal gangue can be used as a raw material for preparing alkali
WhatsAppعرض المزيدFluorine is one of the most active elements cycled in nature, and it is pervasive within almost all areas of the natural environment, such as water bodies, the soil, the atmosphere, and in rocks and organisms (Hong et al., 2018).Fluorine in coal is a harmful element (Ren et al., 1999) as it enters the environment in various forms during the process of coal mining, stacking, storage and
WhatsAppعرض المزيدfrom coal gangue was related to the pH of leachate and the element concentrations in coal gangues [34]. In view of the facts mentioned above, this study aimed to investigate the leaching behavior of Cr, one of the most toxic metals, from CG. To achieve the objectives of reuse of CG and efficiency in the removal of Cr, in this study, column leaching experiments were carried for removal of Cr
WhatsAppعرض المزيد· The results show that the average value of the F in the coal samples collected in different coalfields of China is 304×10−6, while that of gangue samples is surprisingly 1 319×10−6, especially the F content of coal ash from Bangmai in Yunnan Province reaches 4 800×10−6. It has been proved in many provinces of China that burning the coal and clay mixture can produce F contamination.
WhatsAppعرض المزيد· Coal gangue is one of the largest industrial residues. It has high ash content, low carbonaceous content, and heating value. Meanwhile, it has some trace elements. Large quantities of coal gangue cause serious environmental problems by polluting the air, water, and soil as well as occupying a tremendous amount of land. Now, coal gangue utilization is a matter of great concern
WhatsAppعرض المزيد· The gangue freshly mined out of the Pingdingshan 12 mine was used as the fresh coal gangue, and the gangue from the waste gangue hill was used as the weathered coal gangue. First, the gangue was broken, and the gangue with a diameter of 2030 mm was selected through a grading screen (see Figure 6), and then, the gangue was inserted into the incubator, dried for 24 h at
WhatsAppعرض المزيدAccording to the proportions of the coals with different fluorine content in Chinese coal resources, the average fluorine content of Chinese coals is about 82 mg/kg, which is close to the world average (80 mg/kg). Most Chinese coals are lowfluorine coals (<200 mg/kg). Fluorine content in Chinese coals is closely related with structure position of coal basins, the degree of volcanic activity
WhatsAppعرض المزيدCoal gangue can cause significant heavy metal pollution in mining areas, which would have a negative impact on the environment and human health. The objective of this research is to investigate the relationship between expansive soil amount and the leaching behavior of Chromium from coal gangue and the engineering properties of coal gangue used as building materials. The leaching behavior of
WhatsAppعرض المزيدIn the environment, fluorine, the 13th most abundant element in Earth''s crust, typically settles within the soil and readily combines with soil, rock, coal and clay, according to Lenntech. Plants
WhatsAppعرض المزيدThe average content of fluorine in coal spoils was 525mg/kg with the highest value of 1885mg/kg. The only XRD detectable inorganic fluorine phase was fluorphlogopite. The absence of major fluorine
WhatsAppعرض المزيدRed gangue and wash gangue from the same coal mine showed different metal distribution pattern. The lead''s and cadmium''s amiablemove species in gangue from coal washing plants are higer than that in red gangue. Compared with the soil background value of study area and Shandong province, the content of Cu, Ni, Zn, Mn and Cr in coal gangue is lower. While contents of Pb and Cd were higher than
WhatsAppعرض المزيدThe results showed that the metal concentrations dissolved out and the release rate from coal gangue were not only related to the pH value of leachate, but also related to the element concentrations in coal gangues. The concentrations of Cr, Mn, Cu, Zn, Pb and Cd in the filter water and collected rainwater were beyond the limits in the Environmental Quality Standards for third Class Surface
WhatsAppعرض المزيدthe coal gangue is that minerals are layered structure silicates except for quartz and feldspar. Chemical compositions are mainly SiO2, Al2O3 and C, followed by Fe2O3, CaO, MgO, Na2O, K2O, SO3, P2O5, N and H, as well as such metal elements as Ti, V, Co and Ga in some cases[12]. Proportions of chemical compositions are not fixed and vary in location. Table 1 lists the chemical Foundation item
WhatsAppعرض المزيدCoal Gangue is a kind of solid waste discharged from coal mining and coal washing. It is also a kind of blackgray rock with lower carbon content and harder than coal. Its main components are Al2O3 and SIO2. In addition, it contains various amounts of Fe2O3, Cao, MgO, Na2O, K2o, P2O5, SO3 and traces rare elements (gallium, vanadium, titanium, cobalt). The rock mineral composition of coal waste
WhatsAppعرض المزيدignition difficulty and burnout of coal gangue. When the proportion of polyvinyl chloride in the mixture was increased from 20% to 80%, the maximum weightlessness rate of the first stage rapidly increased from %/min to %/min; however, that of the second stage slowly increased from %/min to %/min. A 20% proportion of polyvinyl chloride showed the most significant promotion of co
WhatsAppعرض المزيدcoalgangue models, and the positions of gangue minerals in these models satisfy different distributions such as normal distribution and longtailed distribution [18] and [19]. With the proposed models, the cutting performance can be predicted in advance . Strojniški vestnik Journal of Mechanical Engineering 66(2020)3, 203212 204 Jiang, K. – Gao, K. – Wan, L. and some strategies, which
WhatsAppعرض المزيدElemental analysis for Gangue and coal is to determ Table 1. Elemental analysis of coal and gangue % items C N P H2O H gangue coal groups solidliquid ratio is 1:2 regulating the value of C/N additives (g) bacterial original C/N total nitrogen liquid(ml) chicken manure sludge blank gangue 120g coal 30g mine water 300ml chicken manure
WhatsAppعرض المزيدTable 2 shows that in the material composition of coal gangue, SiO 2 is the main component with high content, accounting for % and % of the fresh and weathered coal gangue, respectively. The secondary element is Al 2 O 3, accounting for % and % of fresh and weathered coal gangue, contents of SiO 2, Al 2 O 3, and S in the weathered coal gangue are lower than
WhatsAppعرض المزيدIn mining, gangue (/ ɡ æ ŋ /) is the commercially worthless material that surrounds, or is closely mixed with, a wanted mineral in an ore deposit. It is thus distinct from overburden, which is the waste rock or materials overlying an ore or mineral body that are displaced during mining without being processed, and from tailings, which is rock already stripped of valuable minerals.
WhatsAppعرض المزيد· Fluorine is one of the trace elements in coal that is harmful to the ecological environment and human''s health. Flotation, a method of finecoal processing, may be useful in reducing the fluorine content in coal before coal combustion. For this purpose, a coal sample with high fluorine content (357 μg/g) was selected for the present work. The modes of occurrence of fluorine were examined by
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