Geochemistry of major and trace elements in Permian coal: with an emphasis on No. 8 coal seam of Zhuji coal mine, Huainan Coalfield, China

Abstract Kokowska-Pawłowska, M. and Nowak, J. 2013. Phosphorus minerals in tonstein; coal seam 405 at Sośnica- Makoszowy coal mine, Upper Silesia, southern Poland. Acta Geologica Polonica, 63 (2), 271-281. Warszawa. The paper presents results of research on tonstein, which constitutes an interburden in coal seam 405 at the Sośnica- Makoszowy coal mine, Makoszowy field (mining level 600 m), Upper Silesia, southern Poland. The mineral and chemical compositions of the tonstein differ from the typical compositions described earlier for tonsteins from Upper Silesia Coal Basin area. Additionally, minerals present in the tonsteins include kaolinite, quartz, kaolinitised biotite and feldspars. The presence of the phosphatic minerals apatite and goyazite has been recognized. The presence of gorceixite and crandallite is also possible. The contents of CaO (5.66 wt%) and P2O5 (6.2 wt%) are remarkably high. Analysis of selected trace elements demonstrated high contents of Sr (4937 ppm) and Ba (4300 ppm), related to the phosphatic minerals. On the basis of mineral composition the tonstein has been identified as a crystalline tonstein, transitional to a multiplied one.

Download Full-text

Method for evaluation of the cleanliness grade of coal resources in the Huainan Coalfield, Anhui, China: a case study

International Journal of Coal Science & Technology ◽

10.1007/s40789-020-00400-6 ◽

2021 ◽

Author(s):

Guangqing Hu ◽

Guijian Liu ◽

Dun Wu ◽

Wenyong Zhang ◽

Biao Fu

Keyword(s):

Trace Elements ◽

Coal Seam ◽

Regional Distribution ◽

Large Data ◽

Index Method ◽

Data Set ◽

Poor Grade ◽

Huainan Coalfield ◽

Coal Grade ◽

Grade Iii

AbstractBased on analysis of a large data set and supplementary sampling and analysis for hazardous trace elements in coal samples from the Huainan Coalfield, a generalized contrast-weighted scale index method was used to establish a model to evaluate the grade of coal cleanliness and its regional distribution in the main coal seam (No. 13-1) The results showed that: (1) The contents of Cr, Mn and Ni in the coal seam are relatively high and the average values are greater than 20 μg/g. The contents of Se and Hg are at a high level while most other trace elements are at normal levels. (2) The cleanliness grade of the coal seam is mainly grade III–IV, which corresponds to a relatively good-medium coal cleanliness grade. However, some parts of the seam are at grade V (relatively poor coal cleanliness). (3) Coal of relatively good cleanliness grade (grade III) is distributed mainly in the regions corresponding to the Zhuji-Dingji-Gubei coal mines and in the eastern periphery of the Panji coal mine. Coal of medium cleanliness (grade IV) is distributed mainly in the regions of the Panji-Xiejiaji and Kouzidong coalmines. Relatively poor grade coal (grade V) is distributed in the southwest regions of the coalfield and the contents of Cr, As and Hg in coal collected from the relatively poor coal cleanliness regions often exceed the regulatory standards for the maximum concentration limits.

Download Full-text

Identifying Correlation of Coal Seams in the Tien Hai Area, Northern Vietnam by Using Multivariate Statistic Methods

Inżynieria Mineralna ◽

10.29227/im-2021-02-11 ◽

2021 ◽

Vol 1 (2) ◽

Author(s):

The Hung KHUONG ◽

Phuong NGUYEN ◽

Thi Cuc NGUYEN ◽

Nhu Sang PHAM ◽

Danh Tuyen NGUYEN

Keyword(s):

Trace Elements ◽

Rare Earth ◽

Coal Seam ◽

Rare Earth Elements ◽

Major And Trace Elements ◽

Coal Seams ◽

Multivariate Statistic ◽

Northern Vietnam ◽

Coal Deposits ◽

Indicator Elements

In northern Vietnam, the Tien Hai area is considered a high potential area of coal deposits. Twohundred fifty-six geochemical coal samples of 13 cores in the Tien Hai area investigate coal seams andcoal deposits to identify the correlation of coal seams. According to the statistical method and clusteranalysis of geochemical samples, the results indicate that the Mg, V, As, Ca, Zn, Cr, Co, K, Na, Sr, Fe,Ge, Re, U, Mo, Th, and Ga elements are good indicator elements of the major and trace elements in coal.Most of them comply with the normal or lognormal distribution rules. Besides, the Yb, Sc, Ho, Er, Tm,Lu, Y, Tb, Pr, Dy, and Sm elements are also good indicator elements for rare earth elements in the region.Therefore, the selected elements are used to identify the correlation of the coal seams in the Tien Hai area.Based on the similarity degree between studied objects, the results of grouping boreholes in coal seamsshow that the correlation of coal seam TV2-11 is suitable and acceptable, the coal seams TV3-6a, TV3-6b, and TV3-6c can be grouped into the coal seam TV3-6. These results present that the models can helpstudy geochemical coal samples and identify the correlation of the coal seams in the Tien Hai area.Additionally, the statistical analysis shows a remarkable degree to determine the correlation of the coalseams. Geochemical coal data can help to evaluate the indicator elements of the major, trace elements,and rare earth elements in coal seams and coal rashing of adjoining and pillar rocks in the Tien Hai area,northern Vietnam.

Download Full-text

Geochemistry of elements associated with Late Permian coal in the Zhongliangshan mine, Chongqing, Southwest China

Energy Exploration & Exploitation ◽

10.1177/0144598718768980 ◽

2018 ◽

Vol 36 (6) ◽

pp. 1655-1673

Author(s):

Shenjun Qin ◽

Qingfeng Lu ◽

Kang Gao ◽

Penghui Bo ◽

Shihao Wu

Keyword(s):

Trace Elements ◽

Inductively Coupled Plasma ◽

Southwest China ◽

Major And Trace Elements ◽

Chemical Extraction ◽

Late Permian ◽

Modes Of Occurrence ◽

X Ray ◽

Sequential Chemical Extraction ◽

Permian Coal

The enrichment and geochemical significance of elements associated with Late Permian coals in Southwest China have always gained widespread interest in the field of coal geology. The present study focuses on the geochemical characterization of Late Permian coal in the Zhongliangshan mine. Twenty-three samples were collected from the K1a coal seam of the Zhongliangshan mine, and the major and trace elements in the coal were analyzed by using X-ray fluorescence spectroscopy (XRF) and inductively coupled plasma mass spectrometry. The composition of minerals in the Zhongliangshan coal, and the modes of occurrence of coal-associated elements, especially those with elevated contents, were studied through a combination of microscopic analyses, X-ray powder diffraction, and scanning electron microscope – energy dispersive X-ray spectrometer. The minerals in coal mainly consist of kaolinite, pyrite, calcite, and quartz, as well as small amount of gypsum and anatase. Compared with the average elemental concentrations in world coal, the Zhongliangshan coal is enriched in Cr, and slightly enriched in Li, U, Sr, V and Ag. Combining the correlation analysis and sequential chemical extraction experiments, it can be inferred that many trace elements in the Zhongliangshan coal have both inorganic and organic affinities. The elements Cr, Li, and V mainly occur in clay minerals, and also are related to organic matter in the coal. Uranium presents firstly in the organic and then silicate states. Strontium shows multiple modes of occurrence including carbonate, silicate, and exchangeable ion states, and Ag primarily occurs in sulfides followed by silicates. The terrigenous debris input from the Emeishan basalt is the major reason for the enrichment of above elements in the Zhongliangshan coal.

Download Full-text

Geochemistry of the No. 6 coal seam of the Guanzigou Mine, Inner Mongolia, Northern China

Energy Exploration & Exploitation ◽

10.1177/0144598718755466 ◽

2018 ◽

Vol 36 (5) ◽

pp. 1245-1264 ◽

Cited By ~ 2

Author(s):

Jinxi Wang ◽

Zhen Yang ◽

Guanlei Bai ◽

Maxim G Blokhin

Keyword(s):

Trace Elements ◽

Organic Matter ◽

Coal Seam ◽

Inductively Coupled Plasma ◽

Vertical Section ◽

Northern China ◽

Major And Trace Elements ◽

Inductively Coupled ◽

Fundamental Information ◽

Chinese Coal

To study the geochemical characteristics of the No. 6 Coal of the Guanzigou Mine, the contents of major and trace elements were determined by X-ray fluorescence spectrometry and inductively coupled plasma-mass spectrometry. Results showed that the contents of SiO2, Al2O3, TiO2, Li, Ga, In, and Pb in the No. 6 Coal are higher than the common contents of the average values in Chinese coal, whereas those of other elements, such as Co, Ni, Rb, Cs, and Ba, are lower. The SiO2/Al2O3 ratio (1.22) is close to the ratio in pure kaolinite (1.18) because of the lower proportion of quartz or boehmite in the coal. In the vertical section, all major and most trace elements in the samples are enriched near the parting and floor. The contents of Al2O3, Li, and Ga have reached their minimum mining grade, supporting their recovery as by-products. The high content of Pb should be paid attention to during coal mining and utilizing. The geochemical associations of the elements were assessed according to correlation and cluster analyses. It was found that Al2O3, SiO2, Li, Na2O, Bi, MgO, K2O, Rb, Cs, and Ga are associated with clay minerals. Cd, Pb, TiO2, and Cu are associated with unidentiﬁed traces of sulﬁde minerals or organic matter. In, Tl, MnO, Co, Std, Fe2O3, and CaO are associated with sulﬁdes, carbonates, or organic matter. P2O5, Sr, Be, Ba, Ni, and U are associated with gorceixite or goyazite. These results not only provide fundamental information on coal seam formation, but also favor the comprehensive utilization of the coal and the assessment of environmental and health-related effects of the coal during mining and utilizing processes.

Download Full-text

Optimal selection of coal seam pressure-relief gas extraction technologies: a typical case of the Panyi Coal Mine, Huainan coalfield, China

Energy Sources Part A Recovery Utilization and Environmental Effects ◽

10.1080/15567036.2019.1639853 ◽

2019 ◽

pp. 1-21

Author(s):

Zheng Shang ◽

Haifeng Wang ◽

Yuanping Cheng ◽

Bing Li ◽

Jun Dong ◽

...

Keyword(s):

Coal Seam ◽

Coal Mine ◽

Typical Case ◽

Gas Extraction ◽

Optimal Selection ◽

Pressure Relief ◽

Huainan Coalfield ◽

Selection Of

Download Full-text

Major and Trace Elements in the Humic Acid

10.26434/chemrxiv.7122413.v1 ◽

2018 ◽

Author(s):

Zoltán Kis ◽

Katalin Gméling ◽

Tímea Kocsis ◽

János Osán ◽

Mihály András Pocsai ◽

...

Keyword(s):

Trace Elements ◽

Humic Acid ◽

Activation Analysis ◽

Analytical Techniques ◽

Major And Trace Elements ◽

Prompt Gamma Activation Analysis ◽

Prompt Gamma ◽

Gamma Activation ◽

X Ray ◽

Precise Analysis

We present precise analysis of major and trace elements of the humic acid. We used three different element analytical techniques in our investigations as prompt-gamma activation analysis (PGAA), neutron activation analysis (NAA) and X-ray fluorescence (XRF) analysis was carried out. We identified 42 elements in our sample.

Download Full-text