In order to recycle the pyrite product from coal gangue, we should use the PE jaw crusher and two-stage crusher to crush it firstly, and then use the corresponding mining equipment to recycle the pyrite from coal gangue. 3. Chemical products are extracted from coal gangue The content of silica and aluminum oxide in gangue is the highest
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A large amount of coal gangue from coal mining and processing is regarded as waste and usually stockpiled directly. In order to recycle the valuable elements from the coal gangue, an integrated process is proposed. The process consists of three steps: 1) concentrating alumina from the coal gangue via activation roasting followed by alkali leaching of SiO2 which produces alumina concentrate for ...
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Jun 10, 2014 Coal gangue is the solid waste generated during coal mining and beneficiation, which accounts for approximately 10–15 wt% of coal production [1, 2].The total accumulative stockpiles of coal gangue in China have reached 4.5 billion metric tons, among which 829 million tons are in Shanxi Province [].Such large amount of coal gangue not only occupies a great deal of lands but also poses …
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In this research, sub-bituminous coal and silica were used to represent low-rank coal and one kind of gangue mineral in a coal sample, respectively. The difference of adsorption behavior of ammonium salt on sub-bituminous coal and silica as well as the surface characteristic change after being processed by ammonium salt were explored and explained.
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Feb 21, 2008 The coal gangue is an inevitable byproduct in the mining process. The coal gangue piles is the primary source of organic pollution in a mining area and has a large impact on the eco-environment of the mining area and its surroundings. There are many coal gangue dumps in China and they contain many hazardous components.
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Coal mining, which can involve substantial silica exposure, was strongly linked to risk of RA in our initial survey in the Appalachian region of the U.S. 1 Using additional survey data, we further analyzed the intensity and duration of coal mining-related exposure, in particular from silica, on the risk of RA. Methods: We conducted a random ...
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May 19, 2021 Since 1970, NIOSH has compiled data on the prevalence of CWP in underground coal miners. The attached figure shows a summary of this data. The prevalence of examined miners with 25 or more years of experience diagnosed with CWP was approximately 33% in the early 1970s. The prevalence dropped to less than 5% by the late 1990s.
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environment created in the aftermath of opencast mining is unable to support biomass development in the region (Figure 5). Illegal and uncontrolled mining in the region is a big issue of concern. In an inspection of Directorate of Mines Safety, Varanasi, in August, 2014 in silica sand mines of
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Coal gangue is residual abandoned coal, produced after the pre-processing steps of mining. It is an amalgam of several unwanted substances. It is important to separate coal gangue from lump coal before fed to thermal power plants. In this paper, investigation on the fundamental characteristics of coal images and gangue images with digital image processing technology is proposed.
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The coal production of China now ranks top in the world, and so there is the biggest coal gangue yield. Despite being used as alternative material in road, pavement, embankment, foundation, or building construction, and so forth [1, 2], most of the coal gangue is still open-air stack-stored near by the coal mines and occupies vast pieces of land leading to a series of environmental problems ...
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Aug 22, 2019 First published on 19th November 2019. Coal gangue is a typical waste produced during coal mining and washing. Synthesis of zeolites via coal gangue can contribute to resource recycling and environmental protection. In this study, high-silica SSZ-13 was synthesized by one-step hydrothermal synthesis from coal gangue without the traditional pretreatment methods of high …
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tants [11,30]. Moreover, in other synthesis methods, additional Al-sources or/and Si-sources are required and the synthesis routes are not environmentally friendly [20–29]. Coal gangue (CG) is a hazardous by-product of coal mining industry and the average production of coal gangue is about 10– 15% of raw coal …
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Coal gangue is a solid waste discharged during coal mining and washing processes. e major chemical components of coal gangue are silica (SiO 2)andalumina(Al2 O 3), whereas the mineral components are quartz and feldspar [ ]. In , the world coal production was , Mt, with a waste yield of , Mt [ ]. In China, coal gangue has accumulated to
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Jan 01, 2016 In this work, waste coal gangue was used as the rich silicon raw material for the preparation of silica aerogel by using a 3-step extraction route to extract and purify Si[O.sub.2] from coal gangue, adjusting Si[O.sub.2] concentration, promoting sol-gel transition, and following single-step solvent exchange/hydrophobization/ambient drying ...
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Silica. Also called silica sand or quartz sand, silica is silicon dioxide (SiO 2). Silicon compounds are the most significant component of the Earth’s crust. Since sand is plentiful, easy to mine and relatively easy to process, it is the primary ore source of silicon. The metamorphic rock, quartzite, is another source.
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Oct 15, 2015 Study on Preparation of Amorphous Nanosilica from Coal Gangue [C]. in Materials for Renewable Energy & Environment (ICMREE), 2011 International Conference, 2011. Google Scholar [12] Chen FQ, Li F, Chen RM, et al. Method for Preparing Silica through Coal Gangue Aluminum Extraction Waste Slag [P]. China Patents CN103420386A, 2013. Google Scholar [13]
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The invention discloses a comprehensive utilization method of coal gangue. The comprehensive utilization method of the coal gangue comprises the following steps: separating alumina-silica of coal gangue by adopting a baking, crushing, sulfuric acid leaching and centrifugal separation method, thereby obtaining an aluminum salt Al2(SO4)3 solution and filter residues (SiO2); adding slaked lime ...
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Jun 02, 2019 Filling mining is an effective way to settle the dilemma of “Three Down and One Above” in coal mining. Fly ash and coal gangue can be used as filling materials with significant social, economic, and environmental benefits. Using coarse fly ash base as cementing material and coal gangue as aggregate, orthogonal experiment of filling paste was conducted in this study.
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Coal occurrence, exploitation, Processing, and utilization have strong impact both on human health and the environment. This results from its composition and environment of occurrence. Maiganga Coal occurs in the Gombe sandstone. Result of the petrography analysis of the study area demonstrates high silica content and the presence of some elements in the mine.
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Silica Mining Processing Equipment Flow Chart Cases ,In almost all cases silica mining uses open pit or dredging mining methods with standard mining equipment Except for temporarily disturbing the immediate area while mining operations are active sand and gravel mining usually has limited environmental impact...As a leading global manufacturer of crushing equipment, milling …
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Gilsonite is a natural, brittle, and glisten tar hydrocarbon, which widely uses in the chemical, paint, and oil industry, besides asphalt production and thermal insulation. Major gangues of Gilsonite are gypsum, pyrite, silica, dolomite, calcite, and shale which are known as ash. Due to the fine liberation degree of gangue minerals from Gilsonite, most of the physical mineral processing ...
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It was investigated that toxic metals (cadmium and lead) enhanced in coal gangue soil used for the reclamation of soil, creates adverse impacts on atmosphere. Presently the chemical fractionation of toxic metals in coal, inner and outer coal gangue soil samples of Lakhra coalfield were studied along …
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the surface of sub-bituminous coal would interact with water and increase its surface hydrophilicity.1,15 3.2. Results of Adsorption Test. The samples used in the adsorption test are sub-bituminous coal and silica with a whole size range. The adsorption formula of sub-bituminous coal and silica on dextrin is as follows = − q CC V m c 0c (1 ...
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Background/Purpose: Exposure to inhaled mineral dust, particularly silica, has been associated with increased risk of RA and other autoimmune diseases.Coal mining leads to silica exposure, but the extent to which RA can be attributed to coal mining has not been estimated. We studied the association of RA with work-related coal and silica exposure in the Appalachian region of the US, given its ...
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Mining types and methods Coal mining Hardrock mining Metal mining Nonmetal mining Oil and gas extraction Sand and gravel mining Stone mining Surface mining Benching Highwall mining Open pit mining Outside dumping Placer mining Underground mining Auger mining Caving Block caving Drift mining Hydraulic backfill Hydraulic mining Leaching Longwall ...
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Oct 28, 2019 Request for Information Metal and nonmetal (MNM) miners and coal miners exposed to silica (quartz) in respirable dust can develop various forms of pneumoconiosis that are irreversible, life limiting, and may lead to death. MSHA’s existing standards limit miners’ exposures to …
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Coal mining industries generate hundreds of millions of tonnes of waste coal, rock and cleaning waste stream containing fine coal (a by-product of previous coal processing operations), coal gangue, coal sludge, fly-ash, coal mine drainage and coal bed methane (CBM) that contaminate the landscape in the mining …
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Energies Special Issue Green Coal Mining Techniques 2020. Coal gangue-based geopolymer (CGGP) is one of the hot spots existing in the recycling of coal gangue resources due to its good comprehensive mechanical properties. However, the coal gangue structure is stable and reactivity is poor, so the coal gangue needs to be activated before ...
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Abstract Iron ore tailings and coal gangue powder are the main sources of industrial solid wastes, the dispose of which has become severe and urgent with the increasing demand of environmental harmony. The present study firstly proposed a reasonable way to deal with the large amount of iron ore tailings and coal gangue powder by making them as the sintered bricks with sewage sludge and shale ...
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May 01, 2015 Coal gangue is regarded as a potential source of aluminum and silica. In this work, acid leaching behaviors of aluminum, iron, and silica in coal gangue were investigated using hydrochloric acid as leaching agent.
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research. The ultrafine silica powder was successfully prepared using coal gangue as the silica source including three steps as follows. The first step is the calcination in order to remove the...
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Aug 20, 2020 Coal gangue, which is a solid waste (silica-alumina solid waste) discharged during coal mining and washing, has become the largest industrial solid waste in China . Coal gangue has high output, low utilization rate and large accumulation, which not only occupies land but also causes serious damage to environment and ecology.
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