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Effects of the mineral phase and valence of vanadium on vanadium extraction from stone coal

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International Journal of minerals,Metallurgy and Materials 2012年第10期19卷 893-898页

作者： Yang-jia Hu Yi-min Zhang Shen-xu Bao Tao Liu College of resources and environmental Engineering Wuhan University of Technology Wuhan 430070 China Hubei key laboratory of mineral resources Processing and environment Wuhan 430070 China

The influence of roasting on the leaching rate and valence of vanadium was evaluated during vanadium extraction from stone coal. Vanadium in stone coal is hard to be leached and the leaching rate is less than 10% when the raw ore is leached by 4 moUL H2SO4 at 90℃ for 2 h. After the sample is roasted at 900℃ for 2 h, the leaching rate of vanadium reaches the maximum, and more than 70% of vanadium can be leached. The crystal of vanadium-bearing mica minerals decomposes and the Content of V（V） increases with the rise of roasting temperature from 600 to 900℃, therefore the leaching rate of vanadium increases significantly with the decomposition of the mica minerals. Some new phases, anorthite for example, form when the roasting temperature reaches 1000℃. A part of vanadium may be enwrapped in the sintered materials and newly formed phases, which may impede the oxidation of low valent vanadium and make the leaching rate of vanadium drop dramatically. The leaching rate of vanadium is not only determined by the valence state of vanadium but also controlled by the decomposition of vanadium-bearing minerals and the existence state of vanadium to a large extent.

关键词： vanadium metallurgy stone coal leaching ore roasting

Subsidence control and farmland conservation by solid backfilling mining technology

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中国有色金属学会会刊：英文版 2011年第S3期21卷 665-669页

作者： GUO Guang-li1, 2, FENG Wen-kai3, ZHA Jian-feng1, 2, 3, LIU Yuan-xu1, 2, WANG Qiang1, 2 1. key laboratory for Land environment and Disaster Monitoring of the State Bureau of Surveying and Mapping, China University of Mining and Technology, Xuzhou 221116, China 2. Jiangsu key laboratory of resources and environmental Information Engineering, China University of Mining and Technology, Xuzhou 221116, China 3. State key laboratory of Geohazard Prevention and Geoenvironment protection, Chengdu University of Technology, Chengdu 610059, China [a] key laboratory for Land environment and Disaster Monitoring of the State Bureau of Surveying and Mapping China University of Mining and Technology Xuzhou 221116 China [b] Jiangsu key laboratory of resources and environmental Information Engineering China University of Mining and Technology Xuzhou 221116 China [c] State key laboratory of Geohazard Prevention and Geoenvironment protection Chengdu University of Technology Chengdu 610059 China

Solid backfilling mining technology, which decreases the height of fissure zone and caving zone, and alleviates the subsidence, is a new technology for farmland conservation. Based on the situation analysis of farmland destruction in mining area, three ways for farmland protection were proposed. In order to improve the feasibility of this technology, the limited filling materials should be used to increase resources recovery ratio, and then the surplus materials could be backfilled into goaf. An index, namely farmland conservation ability, was put forward to optimize the ways for farmland conservation. At last, the Wanbei coal mine was taken as a case for farmland conservation. It was shown that 3240 t dull coal was substituted and 52 hm2 farmland was conserved by solid backfilling mining in this coal mine.

关键词： solid backfilling farmland conservation mining subsidence equivalent mining height

A New Family of Galeaspids(Jawless Stem-Gnathostomata) from the Early Silurian of Chongqing, Southwestern China

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Acta Geologica Sinica(English Edition) 2022年第2期96卷 430-439页

作者： CHEN Yang GAI Zhikun LI Qiang WANG Jianhua PENG Lijian WEI Guangbiao ZHU Min key laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China University of Chinese Academy of Sciences Beijing 100049China Chongqing key laboratory of Exogenic mineralization and mine environment Chongqing Institute of Geology and Mineral ResourcesChongqing 401120China Chongqing Research Center of the State key laboratory of coal resources and Safe Mining Chongqing 401120China CAS Center for Excellence in Life and Paleoenvironment Beijing 100044China Qujing Normal University QujingYunnan 655000China Chongqing Institute of Geological Survey Chongqing 401122China

A new genus and species of agnathan Eugaleaspidiformes(Galeaspida), Yongdongaspis littoralis gen. et sp. nov., is described from the Llandovery(lower Silurian) Huixingshao Formation at Yongdong Town, Xiushan County, Chongqing, southwestern China. This new Telychian taxon morphologically exhibits some transitional states between Sinogaleaspidae and a cluster of higher eugaleaspidiforms containing Tridensaspidae, Eugaleaspidae, Yunnanogaleaspis, and Nochelaspis, which we term here as the ’eugaleaspid cluster’. Phylogenetic analysis of an extended character matrix of Galeaspida reveals Yongdongaspis, on which Yongdongaspidae fam. nov. is erected, as the sister taxon of this ’eugaleaspid cluster’, supported by two synapomorphies, the presence of one median transverse canal, and two lateral transverse canals leaving from the infraorbital canal. As the first fish described from the Llandovery Huixingshao Formation in Chongqing, Yongdongaspis provides new fossil evidence for the subdivision and correlation of the Upper Red Beds in South China.

关键词： vertebrate paleontology Galeaspida morphology phylogeny Telychian Chongqing Municipality

A review of UAV monitoring in mining areas: current status and future perspectives

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International Journal of coal Science & Technology 2019年第3期6卷 320-333页

作者： He Ren Yanling Zhao Wu Xiao Zhenqi Hu State key laboratory of Water resources protection and utilization of coal Mining Beijing 100083 People's Republic of China Institute of Land Reclamation and Ecological Restoration China University of Mining and Technology (Beijing) Beijing 100083 People's Republic of China School of Public Affairs Zhejiang University Hangzhou 310058 People's Republic of China School of environment Science and Spatial Information China University of Mining and Technology Xuzhou 221116 People's Republic of China

With the emergence and development of unmanned aerial vehicles (UAVs), different sensors have become more miniaturized and intelligent. UAVs equipped with various sensors are now an important approach for acquiring spatial data. Many advantages, such as low cost, short revisiting cycle, flexibility and high precision, have made UAVs powerful tools in geological, agricultural, ecological and forestry growth monitoring, as well as evaluation. Now, UAVs are a hotspot in scientific research. Their application in mining areas (MA), although still in its infancy, is developing rapidly in terms of speed, scale and service scope. This research examines aspects such as UAV platforms, different sensors and their application fields, as well as reviewing the advances of scientific research in MA at the present time. By combining current research and the functions of multiple sensors, an application framework for UAV monitoring in MA is constructed. Finally, the challenge and prospects for the development of UAVs and sensors are also considered. This research hopes to provide a technical reference, expanding the knowledge and recognition of UAV monitoring in MA, as well as an assessment of applications in mining, reclamation and environment.

关键词： UAV Sensor Mining areas Monitoring

Source Apportionment of Ambient PM_(10) in the Urban Area of Longyan City,China:a Comparative Study Based on Chemical Mass Balance Model and Factor Analysis Method

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Chemical Research in Chinese Universities 2012年第2期28卷 204-208页

作者： QIU Li-min LIU Miao WANG Ju ZHANG Sheng-nan FANG Chun-sheng environmental Science Department College of Environment and ResourcesJilin UniversityChangchun 130012P.R.China key laboratory of Groundwater resources and environment Ministry of EducationJilin UniversityChangchun 130021P.R.China

In order to identify the day and night pollution sources of PM10 in ambient air in Longyan City,the authors analyzed the elemental composition of respirable particulate matters in the day and night ambient air samples and various pollution sources which were collected in January 2010 in Longyan with inductivity coupled plasma-mass spectrometry（ICP-MS）.Then chemical mass balance（CMB） model and factor analysis（FA） method were applied to comparatively study the inorganic components in the sources and receptor *** results of factor analysis show that the major sources were road dust,waste incineration and mixed sources which contained automobile exhaust,soil dust/secondary dust and coal dust during the daytime in Longyan City,*** are two major sources of pollution which are soil dust and mixture sources of automobile exhaust and secondary dust during the night in *** results of CMB show that the major sources are secondary dust,automobile exhaust and road dust during the daytime in *** major sources are secondary dust,soil dust and automobile exhaust during the night in *** results of the two methods are similar to each other and the results will guide us to plan to control the PM10 pollution sources in Longyan.

关键词： Factor analysis(FA) method Chemical mass balance(CMB) model Source apportionment Atmospheric particle PM10

Zonal disintegration test of deep tunnel under plane strain conditions

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International Journal of coal Science & Technology 2020年第2期7卷 337-349页

作者： Zhichao Tian Chun’an Tang Yejiao Liu Yibo Tang School of resources&Civil Engineering Northeastern UniversityShenyang110819China Inner Mongolia University of Science&Technology Baotou014010China Dalian University of Technology Dalian116024China State key laboratory of Deep coal Mining&environment protection Huainan232001China Taiyuan University of Technology Taiyuan116024China

To investigate the zonal disintegration form of the surrounding rock in deep tunnels,model tests were performed in the simulation set-up of fracture mechanism and support technology of surrounding rock in deep *** test results illustrate that the first fracture of the surrounding rock occurred at the intersection of the tunnel floor and the side *** more serious destruction,the side wall and the vault were *** the fracture width of each surrounding rock mass was distinct,they were relatively uniform with a nearly continuous fracture *** width of the split bodies of the model tunnels(i.e.,the annular zonal disintegration area)developed with an increasing *** was observed from the fitting curves of the data that all radial strain values of the surrounding rock were more symmetric with a smooth fitting curve,and the maximum value occurred near the tunnel wall before reducing *** circumferential strain values were dispersed and the data were inconsistent with the fitting curve,which caused some data to be *** phenomenon of zonal disintegration was primarily caused by radial tension strain of the surrounding *** phenomenon would not extend indefinitely as the rupture range would be limited to a certain extent,because the maximum radial tension strain of the surrounding rock was less than the limiting value.

关键词： Deep tunnel Model test Crack Plain strain Zonal disintegration

Spatiotemporal characteristics and Monte Carlo simulationbased human health risk of heavy metals in soils from a typical coal-mining city in eastern China

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Frontiers of environmental Science & Engineering 2024年第10期18卷 61-74页

作者： Xiangyue Pan Xinrui Weng Lingyu Zhang Fang Chen Hui Li Yunhua Zhang Anhui Province key laboratory of Farmland Ecological Conservation and Pollution Prevention College of Resources and EnvironmentAnhuiAgricultural UniversityHefei 230026China Agricultural Products Quality and Safety Center Xuancheng 242000China

Mining activities typically discharge considerable amounts of heavy metals into the environment,raising concerns about soil metal pollution,environmental security,and human ***,a systematic regional-scale investigation of soil heavy metal pollution in mining areas is necessary for soil *** this study,5817 soil samples from the Huainan coal mining area collected for studies conducted from 2000 to 2021 were compiled to quantify the pollution level and spatiotemporal variation of heavy metals(Cu,Pb,Zn,Cr,Cd,As,Hg,Ni,and Mn).The associated ecological health risk of heavy metals in soil was assessed using the Hakanson ecological hazard index,Monte Carlo simulation in conjunction with the total hazard quotient,and the hazard *** was the top contaminant,followed by *** terms of spatial distribution,heavy metal contamination was more severe in the eastern area of Fengtai and Datong districts,because these districts of Anhui Province are significant industrial *** addition,the results of the Monte Carlo evaluation of human health risks showed that the total noncarcinogenic risk of heavy metals in soil is below the acceptable level,while the carcinogenic risk was 5.97% for adults and 15.53% for *** accounted for 57.4% of noncarcinogenic risk,Cr contributed 36.1%of carcinogenic *** with adults,children are more vulnerable to the carcinogenic and noncarcinogenic risks posed by heavy metals,with oral consumption being the primary exposure *** research can provide useful details for protecting the environment and managing soil in a coal mining area.

关键词： Heavy metals Spatiotemporal distribution Ecological health risk assessment Monte Carlo simulation coal mining area

An Experimental Method for Effectively Digesting Geological Samples

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Journal of Geoscience and environment protection 2019年第6期7卷 83-89页

作者： Weiguo Zhang Fan Yang Chi Zhang Wentao Wang College of Geology and environment Xi’an University of Science and Technology Xi’an China Shaanxi Provincial key laboratory of Geological Support for coal Green Exploitation Xi’an China key laboratory of coal resources Exploration and Comprehensive utilization Ministry of Land and Resources Xi’an China Shenmu Zhangjiamao Mining Co. Ltd. Shaanxi Coal Industry Group Shenmu China

The material composition of geological samples is very complicated. Generally, the method for accurately determining trace elements in geological samples needs to digest the solid samples into liquid state, which is convenient for inductively coupled plasma mass spectrometry. The previous digestion method takes a long time and the operation process is complicated. The Ultra CLAVE microwave digestion instrument was used to digest the geological samples. The types and dosages of the acid used for digestion and the optimal conditions for instrumental testing were published. The results show that this method has short processing time, small data error, safer operation and good digestion effect. This method is suitable for geological sample analysis.

关键词： Microwave Digestion Geological Sample Acid Ratio Time

Quantitative evaluation of soil erosion of land subsided by coal mining using RUSLE

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International Journal of Mining Science and Technology 2012年第1期22卷 7-11页

作者： Meng Lei Feng Qiyan Wu Kan Meng Qingjun Internet of Things(mine Perception)Research Center China University of Mining&TechnologyXuzhou 221008China School of environment and Spatial lnformatics China University of Mining&TechnologyXuzhou 221116China Jiangsu key laboratory of resources and environmental Information Engineering Xuzhou 221116China

Based on a RUSLE model, we identified the key factors of the impact on soil erosion induced by coal min- ing subsidence. We designed a method for predicting/.S factors of a mining subsidence basin, using ana- lytical GIS spatial technology. Using the Huainan mining area as an example, we calculated the modulus of erosion, its volume and classified the grade of soil erosion for both the original area and the subsidence basin. The results show that the maximum modulus of erosion and the volume of erosion of the subsi- dence basin without water logging would increase by 78% and 23% respectively compared with the ori- ginal situation. The edge of the subsidence basin, where the land subsidence was uneven, is subject to the greatest acceleration in soil erosion. In the situation of water logging after subsidence, the maximum modulus of erosion would decrease if the accumulated slope length were reduced. This maximum mod- ulus around the water logged area within the subsidence basin is equal to that without water logging, while the total volume of erosion decreases. Therefore, mining subsidence aggravates soil erosion espe- cially at the edge of basins where water and soil conservation measures should be taken.

关键词： RUSLE coal mining subsidence Soil erosion Quantitative evaluation