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
Get PriceThe experimental study of the coal gangue as gel filling materials Authors Dong mei Tian Jian Yao Zhong an Jiang Xin min Wang Abstract The odd axes resist pressure intensity with
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Get Pricethe method includes calcining and activating the powdered coal at low temperature water extracting the alumina acid extracting the alumina and the silica gel separating the alumina and
Get PriceThe intensity of tao gangue can reach MPa in seven days and anaphase intensity can reach about MPa In the same term the odd axes resist pressure intensity of gel filling body with tao gangue is higher than new gangue and
Get PriceUsing the coal gangue detection and recognition device built in the laboratory the trained SSD YOLOv3 YOLOv4 YOLOv5 and DCN YOLOv3 algorithm network models were adopted to detect coal gangue Figure 10 shows the effect of the detection of coal and gangue of three different sizes 4 6 6 8 and 10 12 cm The SSD network showed individual
Get PriceMoreover the gel foam was used in a spontaneous combustion of coal gangue mountain field practice The results showed that when the mass fraction of sodium dodecyl sulfonate and coconut oil amide propyl betaine was % and 4 6 the foaming amount was as high as 1500 mL When the mass ratio of chitosan to acrylic acid was 1 6 the
Get PriceWhen the coal gangue powder content is 9% the free expansion rate of the sample is % and the sample has changed from expansive soil to non expansive soil [ 36 ] In this study 9% coal gangue powder was used as the optimal water content to carry out the crack development test and the mercury injection test Testing Methods
Get PricePorous coal gangue based geopolymers were prepared by using coal gangue as the raw material Na2SiO3 and NaOH as activators H2O2 as the foaming agent and carboxymethylcellulose sodium CMC as the surfactant The hydrate gel is the main strength source for the porous coal gangue based geopolymer in the first few days After 7 days of
Get PriceCoal gangue is a kind of pollution sources which produced in coal mining It can recycle via coal gangue crushing and screening The gangue discharged from coal mining is composed of various kinds of rocks the hardness and calorific are different Analyzes the effect that different crushers machine crushing gangue Coal Gangue Meaning
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Get PriceCoal gangue is a type of solid waste produced in the coal mining and washing processes The global coal mining industry produces approximately 350 million tons of inactive gangue each year and the accumulated coal gangue in China alone amounts to billion tons [1] [2] [3]
Get PriceAffiliations 1 School of Civil Engineering and Communication North China University of Water Resources and Electric Power Zhengzhou 450045 China 2 State Key Laboratory of Eco Hydraulics in Northwest Arid Region Xi an University of Technology Xi an 710048 China PMID 35806620 PMCID PMC9267344 DOI /ma15134495
Get PriceThe blade erosion and soot build up problems encountered in the earlier locomotives were magnified with the coal turbine Grinding coal into fine particles was also troublesome but necessary because any oversized coal particles could damage the turbine blades Ultimately the experiment was declared a failure and was scrapped after spending
Get PriceIn order to solve the problem of the spontaneous combustion of coal gangue a coal gangue fire extinguishing material of gel foam was developed The foaming agent was screened by the Waring blender method with varying foam amounts and the superabsorbent foam stabilizer was synthesized by free radical polymerization
Get PriceThe silica gel prepared by pyrolysis of a composite of CA and silica had high specific surface area ca 1000 m 2 g 1 and its pore volume increased linearly with increasing CA content In addition the average pore size successively increased from the micropore range to the mesopore range of ca 10 nm with the increase in the CA content
Get PriceReuse of coal gangue CG is an efficient approach to decrease the disadvantages of coal washing operations In this study the CG samples were collected from the north of Iran and have been modified by loading iron oxide to utilize as an adsorbent for zinc and manganese ions The mineralogical and structural of iron oxide combusted CG
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Get PriceThe silica alumina atomic ratio of the coal gangue was approximately Compared with the silica alumina ratio of the gel 15 coal gangue was mainly used as the aluminum source The Al NMR results of the coal gangue are shown in Fig 6c It indicated that Al in the coal gangue consisted of octahedral aluminum and tetrahedral aluminum
Get PriceCoal gangue one of the main hazardous emissions of purifying coal from coalmine industry is rich in silica and alumina However the recycling of the waste is normally restricted by less efficient techniques and low attractive output the utilization of such waste is still staying lower than 15% In this work the silica aerogel materials were synthesized by using a precursor extracted from
Get PriceCoal gangue is a solid waste discharged from the coal mining process and coal washing process Coal gangue is a kind of rich metal alkaline earth metal and sulfide etc It contains a lot of organic components It is easy to pollute the environment under the condition of atmospheric precipitation leaching
Get PriceThese impurities are collectively known as gangue Gangue is generally commercial valueless and we must separate it from the ore This entire process is the concentration of ores Russian Red Ochre 10 00 price with VAT High quality natural red earth from Russia gives a unique deep red hue
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Get Pricebinders are formed of nanocrystalline zeolites held together by an amorphous gel phase of aluminosilicates However the complete physico chemical characteristics of the end coal gangue thus increasing the relative content of alumina and silica available for reaction [13] Calcination of red mud at 600 °C has been reported to impart good
Get PricePDF In order to solve the problem of the spontaneous combustion of coal gangue a coal gangue fire extinguishing material of gel foam was Find read and cite all the research
Get PriceStarch proved to be an economical and eco friendly gellant additive in foaming and consolidation process Coal gangue was recycled to synthesize mullite foams The porosity between and % could be tailored by varying the solid loading and sintering temperatures
Get PriceChina s total coal production in 2024 exceeded billion tons 52% of the world s total Coal gangue a solid waste of coal mining accounts for 15 20% of coal production when directly discharged on the ground surface as waste heaps it occupies large areas of land and cause environmental pollution This paper summarizes the existing gangue backfilling methods their
Get PriceMonodisperse silica powder was synthesized by sol gel method using sodium silicate prepared from acid residue after alumina extraction from coal gangue leached by NaOH The dissolution rate of SiO 2 was determined according to the potassium fluosilicate volumetric method GB/T 27974 2024
Get PriceCoal gangue is a mixture of various mineral rocks that is co occurred with the coal seam during the production process of coal preparation plant Generally speaking carbon clay rocks sandstone carbonate and aluminous rocks are the main components of coal gangue
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