新疆库-拜煤田侏罗系塔里奇克组煤的地球化学特征

Jurassic Tariqik Formation Coal Geochemical Characteristics in Kuqa-Bay Coalfield,Xinjiang

以新疆库拜煤田塔里奇克组煤层为研究对象,对其煤化学及地球化学特征进行分析。认为研究区煤层属低水分、低灰分、特低硫分、高挥发分的长焰煤-气肥煤;煤中的常量元素Al、Ca、Fe、Mg和K平均含量低于中国煤常量元素的平均含量,并有较大的变化范围,仅Na平均含量高于中国煤的平均含量;煤中的微量元素Cu和Co含量高于中国煤的平均含量,Ni和Zn含量接近中国煤的平均含量,其它微量元素含量均明显低于中国煤的平均含量。阐明了Al、Li、Cr、Ti、Zr、Ga、Nb以及轻稀土元素(La、Ce和Nd)具有较强的亲无机性,在煤中主要以无机态存在;Li、Sc、Ti、V、Cr、Ga、Rb、Zr、Nb及重稀土元素中的La、Ce、Pr、Nd、Sm、Gd元素主要与硅铝酸盐矿物及微量的重矿物组合有较好的亲和性;As、Sr元素主要以碳酸盐矿物的形式存在。

Taking the coal in the Tariqik Formation, Kuqa-Bay coalfield, Xinjiang as the subject investigated, analyzed its coal chemical and geochemical characteristics. Considered that the coal in the study area is low moisture, low ash, extra low sulfur and high volatile matter long flame coal to gas-fat coal. Average content of constant elements Al, Ca, Fe, Mg and K in coal are lower than Chinese average, and have wider range of variation, only Na is higher than Chinese average. Average content of trace elements Cu and Co are higher than and Ni and Zn near Chinese coal average, while other trace elements are all obviously lower than Chinese average. Al, Li, Cr, Ti, Zr, Ga, Nb and light rare earth elements （La,Ce and Nd） have stronger mineralphilic property, mainly with inorganic state in coal. Li, Sc, Ti, V, Cr, Ga, Rb, Zr, Nb and heavy rare earth elements La, Ce, Pr, Nd, Sm and Gd have better affinity with mainly aluminosilicate minerals and trace amounts of heavy mineral combination, As and Sr are mainly existed in carbonate mineral state.