【摘要】：準(zhǔn)格爾煤田位于鄂爾多斯盆地東緣,是盆地的重要組成部分,屬于晚古生代石炭—二疊紀(jì)特大型煤田,含煤層系包括上石炭統(tǒng)本溪組、太原組和下二疊統(tǒng)山西組,含煤巖系總厚110~160 m,煤系地層的基底為中奧陶統(tǒng)石灰?guī)r,其上覆地層為下石盒子組、上石盒子組、石千峰組、劉家溝組等非含煤地層。串草圪旦煤礦,位于準(zhǔn)格爾煤田東南部,北鄰哈兒烏素露天煤礦,南接河?xùn)|煤田,主采煤層為山西組的4、5號煤層和太原組的6、9號煤層,煤層厚度大,層間距小,且地質(zhì)及水文條件簡單,頂?shù)装逡苑凵皫r為主。以準(zhǔn)格爾煤田串草圪旦5號煤為研究對象,綜合運用煤巖學(xué)、礦物學(xué)、煤地球化學(xué)方法對5號煤的煤巖煤質(zhì)特征、礦物學(xué)及地球化學(xué)特征進(jìn)行分析研究,取得了如下認(rèn)識:(1)5號煤以半亮型煤和半暗型煤為主,其次為光亮型煤,少見暗淡型煤;半鏡質(zhì)組含量較高;高灰分、中揮發(fā)分、低水分的煤質(zhì)特征;硫含量較低,為特低硫煤。(2)5號煤中發(fā)育高嶺石、磁鐵礦、石英、方解石、黃鐵礦、石膏等多種礦物,其中高嶺石極其發(fā)育,平均含量達(dá)到礦物總量的97.92%;磁鐵礦次之,其余礦物只在個別樣品中被檢測到。(3)分析測試了5號煤中常量元素,Si O2、Al2O3含量(平均為51.70%、42.42%)遠(yuǎn)高于其他元素;其次為Fe2O3和Ti O2(平均含量為1.99%、1.67%);Ca O、K2O、Mg O、Na2O、P2O5的含量較低。(4)Hg、Be、F、U在煤中富集,平均含量較高;As的含量較低。其他的微量元素中,Li、Ni、Se、Zr、Nb、Cd等元素在煤中含量較高,而Cr、Sr等元素含量較低。(5)通過對煤中有害元素與煤物質(zhì)組成的相關(guān)關(guān)系研究,結(jié)合R型聚類與元素共生組合相關(guān)分析,Be、As、U在煤中主要為有機(jī)結(jié)合態(tài)賦存;F在煤中主要為無機(jī)結(jié)合態(tài);Hg于煤中以硫化物結(jié)合態(tài)賦存。(6)通過w(Sr)/w(Ba)、w(V)/w(Ni)、w(V)/w(V+Ni)、w(Sr)/w(Cu)、∑REE等地球化學(xué)指標(biāo),對煤層形成時的沉積環(huán)境、水體條件進(jìn)行了定性分析,認(rèn)為研究區(qū)在晚古生代末期泥炭沼澤受海水影響,還原性較強(qiáng),古鹽度較高,造成了5號煤中Li、Be、F、Ni、Se、U等元素的相對富集,而As、Sr、Sb、Cs等元素相對貧乏。
[Abstract]:The Zhunger coalfield is located in the eastern margin of the Ordos basin and is an important part of the basin. It belongs to the late Paleozoic Carboniferous Permian super-large coalfield. The coal-bearing system includes the Upper Carboniferous Benxi formation, the Taiyuan formation and the Lower Permian Shanxi formation. The total thickness of coal-bearing rock series is 110 ~ 160m, and the basement of coal-measure strata is middle Ordovician limestone. The overlying strata are the Lower Shihezi formation, the Upper Shihezi formation, the Shiqianfeng formation, the Liujiagou formation and other non-coal-bearing strata. Chuancao Gedan coal mine is located in the southeast of Zhunger coalfield, in the north adjacent to Haliwusu opencast coal mine, and in the south of Hedong coalfield. The main coal seam is coal seam No. 4, No. 5 of Shanxi formation and seam No. 6 and No. 9 of Taiyuan formation. The thickness of coal seam is large and the interval between layers is small. The geological and hydrological conditions are simple and siltstone is the main roof and bottom plate. Taking Chuancao Gedan 5 coal in Zhunger coalfield as the research object, coal petrology, mineralogy and coal geochemistry are used to analyze and study the coal and rock coal quality characteristics, mineralogical and geochemical characteristics of No. 5 coal. The following understandings have been obtained: (1) No. 5 coal is mainly semi-bright briquette and semi-dark briquette, followed by bright briquette, rare dim briquette, high semi-vitrinite content, high ash content, medium volatile content, low moisture content, low sulfur content, (2) kaolinite, magnetite, quartz, calcite, pyrite, gypsum and other minerals are developed in No. 5 coal, among which kaolinite is extremely developed with an average content of 97.92% of the total mineral amount, and magnetite is the second. The other minerals were only detected in individual samples. (3) the content of the constant element (42.42%) in No. 5 coal was much higher than that of the other elements, followed by Fe2O3 and TIO _ 2 (average 1.991.67%). (4) the content of Fe2O3 and TIO _ 2 (the average content was 1.991.67%) was relatively low. (4) the content of Fe2O3 and TIO _ 2 was relatively low in coal. (4) the content of Fe2O3 and TIO _ 2 was higher than that of other elements. (4) the content of Fe2O3 and TIO _ 2 (the average content was 1.991.67%) was lower than that of other elements. (4) the content of Fe2O3 and TIO _ 2 was relatively low in coal. The average content is higher and the content of as is lower. The content of other trace elements, such as Li-NiNiSe, ZrZrNb-CD and so on, is higher in coal, but the content of Cr-Sr is lower. (5) the correlation between harmful elements in coal and the composition of coal is studied. In combination with the correlation analysis of R-type clustering and elemental symbiosis assemblage, the main organic binding forms of Bea Asau in coal are inorganic bound Hg and sulfide-bound Hg in coal. (6) geochemical indexes such as w (Sr) / w (Ba) / w (V) / w (Ni) / w (V Ni) / w (Sr) / w (Cu), 鈭，

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