煤层夹矸中高岭石的x光衍射特征及其成因

二叠纪山西组二:煤层在焦作煤田为主要可采煤层,煤层夹矸的斌存与煤层结构有关,焦作煤田东部二:煤层结构较西部复杂,至使煤层夹矸增多。夹矸的矿物成份经 x 射线衍射半定量分析。主要为高岭石;地开石;伊利石;伊蒙混层矿物:碎屑石英等。上部夹矸中的高屿石含量在90%以上,镜下观察有的高岭石和伊利石保留着长石晶体假象,同时可见伊利石转化为高岭石。以上矿物经 x 射线衍射分析高岭石的(001)面和(002)面上的峰值强,但它们之间的六个峰值不明显,表明高岭石的结晶有序度不高。下部夹矸高岭石(001)面和(002)面之间,无六个峰值,结晶更差,夹矸中次生高岭石的(001)面和(002)面上峰值强。它们之间六个峰值强明显, 值在35～40之间的峰值也清晰,结晶有序度高,有的高岭石已转化为地开石。

THE GENESIS AND THE CHARACTERISTICS OF X-RAY DIFFRACTION FROM KAOLIN IN DUNNBASS OF THE COALBED

The #Ⅱ,coal bed of the Shanxi Formation,is a main seam which can be mined in the Jiaozuo coal basin.The occurrence of dunnbass in the coal bed in the eastern part of Jiaozuo is so complex that the coal bed dunnbass is increased more than it is in the west.The mineral composition in the dunnbass consti- tutes a main of Kaolinite,Dickite,Illite,Illite-mentinoril- lonite and quartz. The Kaolinite content is more than 90% in the topp of dun- nbass,under the polarization microscope analysis.Some Kaolinite and Illite retain the false appearance of Feldspar.At the same time,we can watch Illite turn into Kaolinite.These minerals are analysed by X-ray diffraction.The result is Kaolinite face- symbol (001) and (002) which have strong peak value.But the six diffraction peaks in it are unclear.This makes it known that Kaolinite does not have high crystallinity.Between Kaolinite face symbol (001) and (002) in the end of dunnbass,there is not a six peak value,and crystallization is worsened.Secondary Kaolinite face-symbol (001) and (002) have strong peak value in dunnbass. The six diffraction peaks at 20 values from 35 to 40 degrees and it has high crystallinity.Some Kaolinite has turned into Dickite.