The occurrence of gallium in gallium enriched coal gangue and the migration of gallium during thermal treatment were systematically studied The phase and chemical composition of gallium enriched coal gangue were determined and the gallium content was determined by inductively coupled plasma mass spectrometer ICP MS The mineralogical
XRF analysis of coal gangue Table 2 shows that the average content of SiO 2 in the main chemical components of coal gangue is relatively high with a content of % followed by Al 2 O 3 with
The total amount of trace elements in coal gangue may not provide enough information for evaluating its environmental effects [12] Therefore it is of Quantify the trace elements fraction in coal gangue and determine the proportion of each fraction in different elements; 3 Assess the contamination degree by geo
Coal gangue is one of the most accumulated solid wastes in China its accumulation occupies a large amount of land resources and the potential environmental risks posed by coal gangue continue to rise In this study sequential extraction was employed to analyze the fractionation behavior of trace elements Cd Cr Cu Mn Ni Pb V and Zn The
As typical solid wastes coal gangue carbide slag and desulfurization gypsum are in urgent need of reuse Coal gangue is enriched with SiO 2 and Al 2 O 3 bearing a chemical composition analogous to that of bauxite [8] [9] The primary chemical composition of carbide slag is Ca OH 2 with a content ranging from 54 % to 72 % [10] [11
Coal gangue is the industrial residues during coal mining activities approximately 10 15% of raw coal production and known as high ash yield low heating value and low carbon content Zhou et al 2014b With the development of circulating fluidized bed combustion technology coal gangue could be applied for electricity production by additive suitable
Coal plays a dominant role 70% in energy consumption of China Huang et al 2017 A large amount of solid waste coal gangue would be produced in processing and accounts for 10 15% of the raw coal approximately Li and Wang 2019 Currently the cumulative amount of coal gangue is estimated to be more than billion tons given the large production of coal
coal gangue is lower only accounting for % China Resource Recycling Association 2021 A large quantity of coal gangue is stored around the coal mines and various heavy metal elements in coal gangue will inevitably lead to their migration under the inuence of the external environ ment such as weathering erosion and rainwater leaching
The proportions of REEs in the aluminosilicate in samples A C and D were % % and % respectively whereas the proportion of REEs in the aluminosilicate in sample B was greater than the above three samples Wu G Wang T Wang J Zhang Y Pan W 2020a Occurrence forms of rare earth elements in coal and coal gangue and
Coal gangue is a solid waste generated during coal mining and processing containing energy components and critical elements [1 2] Long term storage of coal gangue occupies a substantial amount of land and may cause spontaneous combustion leading to air and groundwater pollution [] Gallium Ga and germanium Ge are critical strategic elements for
China is the largest producer and consumer of coal in the world; a large amount of solid waste including coal gangue will be produced in the process of coal mining; heavy metal is one of the
Coal gangue accounts for a large proportion of the solid waste in China and greater attention has been focused on the concentrations of potentially hazardous trace elements PHEs than on the
The contents of 16 US Environmental Protection Agency EPA polycyclic aromatic hydrocarbons PAHs in coal gangue samples with different metamorphic degrees R 0 max=% % % %
However CFA contains potentially hazardous trace elements including boron B fluorine F arsenic As and chromium Cr Box plots of total concentrations of major elements in coal fly ash samples Boxes indicate the 25 75 percentile range a solid line dividing box the median a dash dot line dividing box the mean and bars the 10
6 The results show that the average contents of Hg Pb Cd Cr As Cu Zn Mn Se and Be in the coal gangue are and mg/kg
Coal gangue CG is an associated product in the process of coal mining and washing accounting for approximately 10 15% of the raw coal production and in some small and medium sized coal mines
Bornite and digenite occur as secondary inclusions The major impurity element in the copper concentrate is fluorine which is mainly contained in talc phlogophite and apatite Fluorine in the talc phase is more problematic due to the natural floatability of talc Pangum et al 1997 Initially an organic depressant carboxyl methyl cellulose
Distribution of rare earth elements REEs in six speciations extracted from coal and coal gangue and their combustion products slag and fly ash generated by three different power plants in
