共查询到15条相似文献,搜索用时 187 毫秒
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石屏一矿作为川南煤田古叙矿区内重要的生产矿井,其煤炭资源丰富并蕴含锗、镓等稀散金属。为探究煤中锗、镓的分布、赋存情况及其影响因素,通过收集川南煤田石屏一矿的地质勘查资料,综合整理分析煤中锗、镓的测试成果并总结其分布规律,建立锗、镓与灰分、挥发分和全硫的相关性研究,从而达到研究目的。结果表明:平面上,锗含量基本稳定,平均为3.4 ug·g-1,处于正常水平;垂向上,随着煤层埋深的增加,锗含量呈升高趋势,其中C25煤层中锗含量较高,平均为6.4 ug·g-1,为轻度富集;平面上,镓含量为5~50 ug·g-1,平均值为22.2ug·g-1,在矿区北部和中部已达最低工业品位;垂向上,各煤层中镓均达到轻度富集,其中C13煤层中镓含量最高,平均为30.5 ug·g-1;煤中镓主要受到灰分的影响,且镓主要表现为无机亲和性,其可能以粘土矿物为载体;而锗具有机亲和性,其可能与酚羟基结合而赋存于有机质中,且一小部分锗还可能赋存在硫铁矿硫、硫酸盐硫或有机硫中。安静、低能的海相沉积环境(泻湖)中形成... 相似文献
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中国煤中的铀、钍和放射性核素 总被引:14,自引:0,他引:14
中国煤中的铀平均含量为3mg/kg,在某地富铀煤中检测到的最高值达25660mg/kg,其赋存状态主要是与有机质相结合的方式;钍平均含量6 mg/kg,没有发现异常现象.南方一些地区的石煤中含有较多的放射性核素,并且容易在灰渣中富集,综合利用时应加强监控,以避免产生危害. 相似文献
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宁武煤田是我国典型的煤伴生资源丰富的煤炭基地。为研究煤中Ga的成矿规律,从宁武煤田2号煤中采集了117个煤样,通过工业分析、X射线衍射、扫描电子显微镜、X射线荧光光谱、电感耦合等离子体质谱和逐级化学提取实验对样品进行测试分析。结果表明宁武煤田2号煤中Ga的平均含量为30.93μg/g,整体上属于轻度富集—富集。逐级化学提取的结果显示煤中Ga的赋存以残渣态为主,占比87~92%,其次为有机态,占比6%~10%。由煤中Ga与煤质和常量元素的相关性分析认为,高岭石、勃姆石等黏土矿物是煤中Ga的主要矿物载体,黏土矿物对Ga的吸附是2号煤中Ga富集的主要原因。 相似文献
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通过对大量煤田(矿区)勘查资料煤中锗含量化验数据的统计分析,以矿区(煤田)为统计单元,确认东北赋煤区主要矿区(煤田)煤中锗含量平均值为1~5 μg/g,均分布在中国煤锗含量平均值附近;即使在典型煤-锗矿床乌兰图嘎所在的胜利煤田和五牧场所在的伊敏煤田,统计煤中锗平均值分别为2.63 μg/g和3.30 μg/g,没有明显的升高,胜利、伊敏煤田其他井田,煤中锗含量平均值均与中国煤中锗含量平均值相差不大,煤中锗的富集表现为在小范围内聚集;煤中锗富集区域常可见热液矿物,结合前人对典型煤-锗矿床的研究,认为煤中锗主要由热液携带进入,热液侵入为煤中锗的富集提供了有利条件。本次工作在二连、海拉尔盆地新发现一批煤中锗异常点,由于煤中锗的富集通常范围较小,已有煤田勘查资料显示有未能控制到锗富集的范围,这些异常点很值得做进一步工作。 相似文献
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为研究云南临沧勐托新近系褐煤的微量元素地球化学特征,共采集了11个褐煤样品,采用ICP MS和ICP CCT MS(As和Se)对煤中微量元素进行了测试。结果表明:与中国煤相比,勐托褐煤中Rb(96.1 mg/kg)、Sb(15.3 mg/kg)和Cs(25.9 mg/kg)显著富集,W(10.6 mg/kg)和U(20.2 mg/kg)富集,Be(7.84 mg/kg)、Ga(16.1 mg/kg)、As(11.6 mg/kg)、Cd(0.67 mg/kg)、Sn(6.66 mg/kg)、Pb(34.6 mg/kg)、Bi(3.86 mg/kg)和Th(28.2 mg/kg)稍富集,微量元素组成与大寨富锗煤不同,与酸性花岗岩物源供应有关。勐托褐煤中REY含量范围为121~420 mg/kg,平均251 mg/kg,均较大寨富锗褐煤高,且以Ce显著正异常和Eu显著负异常为特征,明显区别于大寨褐煤,Eu负异常和上陆壳标准化的REY分配模式均表明勐托褐煤中稀土元素受盆地周边花岗岩风化陆源碎屑供应影响。 相似文献
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《International Journal of Coal Geology》1988,10(1):99-108
Trace-element analyses of seventy six coal samples representing all the major Lower Gondwana coal basins of India were carried out. Eighteen trace elements, viz., B, Ba, Co, Cr, Cu, Ga, Ge, La, Mn, Mo, Nb, Ni, Pb, Sn, Sr, V, Y and Zr were determined quantitatively in coal ash. An attempt was made to correlate the coals of different coalfields on the basis of multivariate analysis. In addition, the organic/inorganic affinities between the trace elements were established by the coefficients of correlation between the trace elements and ash present. A synthesis of the data reveals that there is similarity in the concentration ranges of trace elements among the coal seams of different coalfields, but the possibility of environmental differences exists due to the statistically different multivariate means of the trace-element concentrations.It is inferred that Ge, Cr, Y and La occur in these coals as organo-metallic complexes and chelates. The elements Ni, Co, Ga, V and Cu show both organic and inorganic association, whereas Mn and Ba are exclusively incorporated in the inorganic fractions. 相似文献
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Fluorine is one of the potential hazardous trace elements in coal. Fluorine may be released into atmosphere mostly during
coal combustion process. When the coal is burning indoors without any controlling methods (chimney), the fluorine will pollute
the room and is absorbed by food fired (dried) over stoves. Now many people have suffered from fluorosis due to coal burning
indoors in Southwest China. In this paper, the concentration, distribution, mode of occurrences and impact factors of fluorine
in Chinese coals are analyzed. The environmental impacts and typical features of fluorosis are studied. It is concluded that
the value of fluorine in Chinese coals ranges from 20 to 300 mg/kg, and with average value of 122 mg/kg from 5,603 coal samples.
It is higher than the average value of the world coals (80 mg/kg). In provincial coalfields of the SW China, the content of
F is highest and many people have been affected due to coal combustion indoors. 相似文献
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Jin-xi Wang Zhi-heng Fu Ya-fan Hu Zhen Yang Jia-liang Ma Yu-zhuang Sun 《China Geology》2021,4(2):266-273
To understand the geochemical characteristics of the No.9 coal in the Daheng Mine of the Ningwu coalfield, the trace element analysis was conducted through X-ray fluorescence spectroscopy (XRF) and inductively coupled plasma mass spectrometry (ICP-MS). The sedimentary environment was discussed according to the element geochemical parameters. The results show that Li, Ga, Hf, Zr, Nb, Th, and Ta are slightly enriched in the No. 9 coal of Daheng Mine. The average value of the rare earth elements and yttrium (∑REY) in coal here is 144.20 μg/g (excluding parting), which is higher than the average value of ∑REY in the world ’s coal and China ’s coal. The light rare earth elements (LREY) are enriched. The content of Eu was 0.12–2.10 μg/g with an average of 0.57 μg/g, and the Eu is obviously negatively abnormal. Most of the trace elements in the coal are positively correlated with the ash content, which shows that the occurrence of these trace elements is related to inorganic minerals. The results of sequential chemical extraction experiments show that rare earth elements mainly exist in coal in the form of aluminosilicate. The value of the Sr/Ba and the content of S reflect that the coal-forming environment was influenced by seawater. The values of V/Cr and Ni/Co reflect that the peat swamp is in an anaerobic environment and a strongly reducing environment during the coal-forming period. 相似文献