Coal Extraction Technology from Gangue

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Study on Al2O3 extraction from activated coal gangue under

 · Moreover the acid leaching kinetics of aluminum oxide from coal gangue was investigated with sulfuric acid. It showed that the air atmosphere promoted kaolinite decomposition during coal gangue calcination. The hydrogen atmosphere promoted the activation and decomposition of kaolinite at reaction temperatures exceeding 650°C.

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Enrichment of heavy metals in coal gangue by puff balls

 · on coal gangue puffball-covered coal gangue (biotic coal gangue) and surrounding coal gangue without puff balls (control coal gangue) were collected in a large coal gangue dump of Maiping mining area in Huaxi District of Guiyang City in November 2012 (Fig. 1). The diameters of puffball fruiting bodies range from 2–6 cm. 2.2 Experimental methods

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Efficient Extraction of SiO2 and Al2O3 from Coal Gangue by

Coal gangue is mainly composed of SiO2 Al2O3 and other components. It is a huge reserve of aluminum and silicon resources. The coal gangue stockpiles in China is more than 5 billion tons at present of which contain Al2O3 more than 1 billion tons SiO2 more than 2.5 billion tons. It will make supplement for the lack of bauxite resources in China to some extent by extracting Al2O3 with

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Source Alkali-Leached from Coal Gangue Synthesis of

 · 14/ 188 J. Yang et al. Figure 3. Influence of mass ratio of NaOH to CCG (M NaOH/M CCG) on the mass ratio of filter cake to the CCG(M fc/M CCG). where M CCG and wCCG S are the mass of the CCG used in the batch and the mass fraction of SiO 2 in the CCG respectively. M fc and wfc S are the mass of the filter cake and the mass fraction of SiO 2 in the filter cake respectively.

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Extraction of alumina from alumina rich coal gangue by a

Vast quantities of gangue from coal mining and processing have accumulated over the years and caused significant economic and environmental problems in China. For high added-value utilization of alumina rich coal gangue (ARCG) a mild hydro-chemical process was investigated to extract alumina. The i

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Improved extraction of alumina from coal gangue by surface

 · Coal gangue a type of kaolinite clay in coal measures is one of the largest categories of solid industrial wastes in China. Alumina extraction from coal gangue could offer an alternative to bauxite as a source of alumina. Mechanically modification by grinding is an effective activation method to improve alumina recovery from coal gangue.

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A Study of Multispectral Technology and Two-Dimension

 · Coal is one of the main sources of human energy. In the process of coal mining separating gangue from coal has great significance for environmental protection and energy conservation. The core problem in the separation of gangue is the recognition of coal and gangue. In this study multispectral technology was used to identify gangue. First set up a data acquisition system in the laboratory

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Extraction of alumina from alumina rich coal gangue by a

 · 1. Introduction. Coal gangue is an industrial solid waste produced by coal mining and processing 1–3 .The average production of gangue accounts for 10–15 of raw coal production 4 5 making coal gangue one of the biggest solid wastes in China.At present utilization ratio of coal gangue can reach about 60 in some countries.

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Source Alkali-Leached from Coal Gangue Synthesis of

 · School of Materials Science and Technology China University of Geosciences Beijing 100083 China using coal gangue as the silica source including mainly three steps. The first step is the 3.2 Extraction of Silica Component from CCG

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Review of Coal Gangue Characteristics and Ecological

 · Coal gangue has become one of the industrial wastes with the largest annual discharge and accumulated stock in China. The disorderly accumulation of coal gangue not only occupies a large amount of land resources and causes natural disasters but also pollutes the surrounding ecological environment which in turn affects human health and normal production and life.

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Orthogonal Experimental Research the Gangue in Gallium

 · and the progress of science and technology. At present coal gangue power generation coal gangue production materials backfilling extraction of chemical products and other ways. Coal Gangue with high carbon content can be used as fuel coal gangue with low carbon content can produce

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Study on Al 2 O 3 extraction from activated coal gangue

Coal gangue was calcinated under air nitrogen carbon dioxide air-hydrogen and hydrogen atmospheres. The effects of different calcination temperatures and atmospheres on the mineral composition of activated coal gangue were investigated by X-ray diffraction. Moreover the acid leaching kinetics of aluminum oxide from coal gangue was investigated with sulfuric acid.

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Coal and Coal Gangue Separation Based on Computer Vision

The ray recognition method is harmful to the human body and the mechanical vibration method is only applicable to a few scenes. In recent years coal and gangue separation technology based on

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Multispectral and joint colour-texture feature extraction

 · Ore sorting is a useful tool to remove gangue material from the ore and increase the quality of the ore. The vast developments in the area of artificial intelligence allow fast processing of full color digital images for the preferred investigations.

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Preparation of SiC from acid‐leached coal gangue by

 · For the comprehensive utilization of coal gangue acid-leached coal gangue was used as silicon source and part of carbon source low ash anthracite and degreasing cotton were added respectively as supplementary carbon source SiC and SiC fiber were prepared by carbothermal reduction method accordingly.

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Rare Earth Elements from Coal and By- Products

 · Purpose Utilize advanced characterization to develop innovative extraction and enrichment technologies to unlock the potential of coal to create a domestic REE/CM industry. Strategic Alignment 1. Economic and Energy Security through the production of minerals critical to domestic industries and which underpin the energy technologies of the

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Application and Development on Coal Mine Backfill

A. The roadway mining and gangue backfill technology The technology is aiming at the extraction of coal pillar isolated coal resource or areas under surface mining facilities. The main equipments used are the roadheader and gangue casting machine. Generally the roadway was excavated in the residual coal area and supported by the bolts

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Study on Aluminum Oxide Extraction from Coal Gangue

Abstract <>Coal gangue is industrial residues discharged when coal is excavated and washed in the pro- duction course of coal mine and is one of industrial solid wastes with biggest discharging.Accord- ing to statistic the integrative discharging of coal gangue is equal to 15 20 of raw coal and the accumulative total of stockpile may reach more than 7 thousand million tons.Existing

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Automatic Separation System of Coal Gangue Based on

 · It is important to separate coal gangue from lump coal during the production of coal mine. The system investigated the fundamental characteristics of coal images and gangue images on the basis of digital image processing technology. Median filter edge extraction and grayscale comparison of coal images and gangue images were successively carried out by the technology of image preprocessing

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Novel Process for Alumina Extraction via the Coupling

 · A novel process for the coupling treatment of coal gangue and red mud is reported. Red mud containing 23.4 Al2O3 19.1 SiO2 and 9.4 Na2O by weight was used as the blended ingredients of coal gangue for alumina extraction. Calcination of coal gangue with the addition of Na2CO3 at 850 °C could obtain more than 90 of Al2O3 extraction.

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Research on the Extract Al2O3 from Coal Gangue

The experiments selected Wang Taipu gangue as raw materials and adopted single factor experimental method to study the leaching of aluminum oxide from gangue by using hydrochloric acid as leaching medium. The experiments studied solvent/sample mass ratio hydrochloric acid/sample liquid-solid ratio hydrochloric acid concentration leaching time and leaching temperature on Al2O3 leaching rate

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Extraction of SiO2 and Al2O3 from coal gangue activated by

 · In this work a novel method is introduced to activate coal gangue (CG) for extraction of Si and Al species. The activation experiments were carried out using a stainless steel tube reactor (17 mL) and an autoclave reactor (1000 mL). Firstly CG was activated by supercritical water added with alkali.

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Introduction of High Alumina Coal Gangue Resources and

In this paper high alumina coal gangue resources situation in China was introduced and the main alumina extraction technologies and their industrialization progress were specifically analysed. The author also put forward suggestion on promotion of industrialization utilization of this resource.

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Modification of waste coal gangue and its application in the

 · Modification of waste coal gangue and its application in the removal of Mn(2 ) from aqueous solution. Water Science and Technology ( IF 1.915 ) Pub Date DOI 10.2166/wst.2016.235

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Image Recognition of Coal and Coal Gangue Using a

Recognizing and distinguishing coal and gangue are essential in engineering such as in coal-fired power plants. This paper employed a convolutional neural network (CNN) to recognize coal and gangue images and help segregate coal and gangue. A typical workflow for CNN image recognition is presented as well as a strategy for updating the model parameters.

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Coal Gangue Yards Information Extraction Using Object

 · HUANG Dan LIU Qingsheng LIU Gaohuan YAN Wenbo. Coal Gangue Yards Information Extraction Using Object-oriented Method Based on SPOT-5 Remote Sensing Images J .Journal of Geo-information Science 2015 17(3) .DOI 10.3724/SP.J

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CNAMethod for extracting alumina from coal

The invention mainly relates to a method for extracting alumina from coal gangue. The coal gangue is ground and then is calcined through a fluidized furnace and iron is removed through a magnetic separator the coal gangue with the iron removal reacts with an acid to obtain an aluminum chloride solution without silicon impurities the solution containing the aluminum is concentrated and

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Extraction of alumina from alumina rich coal gangue by a

 · For high added-value utilization of alumina rich coal gangue (ARCG) a mild hydro-chemical process was investigated to extract alumina. The influences of NaOH concentration mass ratio of alkali to gangue reaction temperature and reaction time were systematically studied.

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Extraction of Coal and Gangue Geometric Features with

 · The conventional way of manual selection and separation of gangue from the raw coal can be replaced by computer vision technology. In the literature research on image recognition and classification of coal and gangue is mainly based on the grayscale and texture features of

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Automatic Separation System of Coal Gangue Based on DSP

 · It is important to separate coal gangue from lump coal during the production of coal mine. The system investigated the fundamental characteristics of coal images and gangue images on the basis of digital image processing technology. Median filter edge extraction and grayscale comparison of coal images and gangue images were successively carried out by the technology of image preprocessing

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Science Mining and Clean Coal Technology in China

 · thick coal seam large dip angle coal mining backfilling . mining in ground control coal and gas simultaneous . extraction) equipment research and development (the main . equipments in coal mining automated mining. and remote . monitoring te. chnology information and communication . technology) environmental protection and resource

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Orthogonal Experimental Research the Gangue in

 · and the progress of science and technology. At present coal gangue power generation coal gangue production materials backfilling extraction of chemical products and other ways. Coal Gangue with high carbon content can be used as fuel coal gangue with low carbon content can produce

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Science Mining and Clean Coal Technology in China

 · thick coal seam large dip angle coal mining backfilling . mining in ground control coal and gas simultaneous . extraction) equipment research and development (the main . equipments in coal mining automated mining. and remote . monitoring te. chnology information and communication . technology) environmental protection and resource

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