·Shanxi Bright Kaolin Technology Corp located in a major coal producing region has developed a technique to manufacture kaolin a white clay mineral from coal gangue — a byproduct of coal
·The long term high yield production of coal has resulted in the large scale accumulation of coal gangue on the ground surface which causes serious environmental problems Therefore clean and environmental treatment of coal gangue is urgently needed In this study the inductively coupled plasma mass spectrometer and atomic fluorescence
·In order to solve the environmental pollution of coal gangue and the shortage of aggregate resources in road engineering waste coal gangue is used as road base material instead of natural stone
·Top coal caving is a process for the rational extraction of large amounts of coal resources However this process readily causes release of excessive amounts of gangue during the coal release process The conventional technique which involves visual inspection is not only labor intensive but also can introduce inaccuracies Coal and gangue identification methods
·With the improvement of coal mining depth and mechanization level the difficulty of coal slime water CSW disposal increases The preparation of cementitious materials with CSW can not only solve the disposal problems but improve the structural stability and mechanical properties of coal gangue CG piles as a cementitious material At the same time
·The heavy metals Cd Cu Ni Pb and Zn included in the coal gangue pose an environmental problem These harmful heavy metals can be released by leaching coal gangue into water and soil
Gradation curve of the coal gangue Moistrue content % d Relation between dry density and moisture content in coal gangue Additionally coal gangue s other basic properties are listed in Table 1
Against the backdrop of achieving the goals of peak carbon emissions and carbon neutrality coal as the cornerstone of national energy security plays a crucial role in the green development of our country s economic construction and social development However during the process of coal mining and washing coal gangue as the primary associated by product of coal has
·Abstract Coal gangue as one of the largest industrial solid wastes in China brings about very serious environmental social and economic problems Comprehensive utilization of coal gangue is of importance to sustainable development of society and economy
·In Tangshan Mine there are four engineering problems including the layout of multiple seam mining system serious environmental damages caused by gangue accumulation and surface collapse nearly 100 million tons of three under coal coal trapped under buildings water bodies and railways to be released and the control accuracy of stratum formations to
·The environmental characteristics of coal gangue dumps in Yangquan Shanxi Province China were investigated The amounts of coal gangue are very high in this coal region given the large coal
·Compacted coal gangue is often used as subgrade soils in South Central China To understand further the effects of drying wetting D W cycles on the hydromechanical behaviour of compacted coal gangue subgrade this paper presents a series of laboratory test results on reconstituted coal gangue subjected to multiple D W cycles The effects of vertical
·To solve the problem of limited adsorption efficiency of pristine biochar for phosphate a novel biochar composite was prepared from different feedstocks and coal gangue by one facile step
·1 Introduction Coal gangue is a by product of coal mining and washing process Li et al 2006 In China there are 5 billion tons of coal gangue accumulated as residual waste and this value continues to grow at the rate of 300 350 tons per year Li and Wang 2019; Moghadam et al 2019 Large amount of coal gangue not only occupies farmland but also
·Coal gangue is the largest amount of industrial solid waste in China It caused serious damage to the ecological environment and waste resources Therefore it is of great significance to realize the resource utilization of coal gangue protecting the environment and realizing the sustainable development of society This paper summarizes the utilization of coal
·During coal and coal gangue combustion many heavy metal pollutants are emitted and cause serious environmental problems In this paper the environmental effect values of As and Pb emission
·In the process of excavation and utilization of the coal gangue hill gangue at different weathering degree was exposed to the environment which can be harmful to the surroundings In order to find the law of heavy metal release and to evaluate the potential ecological risk five kinds of coal gangue at different weathering degrees were collected from a
·In order to better understand the role of coal gangue in potential environmental and ecological risks the leaching behavior of trace elements from coal gangue has been investigated in an open cast coal mine Inner Mongolia China Four comparative column leaching experiments were conducted to investigate the impacts of leaching time pH values and sample
·Using unburned coal gangue as roadbed filling not only alleviates the difficulty of land acquisition and soil collection for road constructions in mining areas but also consumes a large amount of
·In this respect SBCM can effectively alleviate the environmental problems caused by gangue discharge in coal mining including occupying the ground and spontaneous combustion [6][7] [8] [9
·Chen Y Coal pointed out that gangue accumulates in huge coal gangue piles occupying lots of land as well as having a striking influence on the neighboring environmental effects [1 2]
·plant available silicon and aluminum ions In an alkaline environment coal gangue can neutralize acidic soils liberating alkaline metal ions like calcium and magnesium increasing the soil s pH and promoting crop growth Improvement of Soil Structure The high porosity and porous nature of coal gangue increase soil pore space enhancing soil
·Coal gangue is one of the largest industrial solid wastes in China; the comprehensive utilization of coal gangue has important social economic and environmental benefits In this paper the coal gangue and comprehensive utilization have been discussed in detail Through the survey results expounds the development of the use of coal gangue and
·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
