QDTA／T／EGD／GC在线联用技术X．菱铁矿、高岭石、白云石、方解石、石英五元混合矿物的组成分析

QDTA/T/EGD/GC On-Line Coupled Simultaneous Technique X. Composition Analysis of Five-Component Mixed Minerals of Siderite,Kaolinite,Dolomite,Calcite and Quartz

摘要: 应用已建立的ＤＴＡ／Ｔ／ＥＧＤ／ＧＣ在线联用技术及其装置，在ＣＯ＿２和空气下鉴定了白云石中的微量菱铁矿；在空气下测定了方解石的纯度；在Ｎ＿２气下对配合的菱铁矿、高岭石、白云石、方解石、石英五元混合矿物的组成进行了分析。实验结果表明：白云石／方解石（１：１）的混合矿在ＣＯ＿２下两者热分解释放出ＣＯ＿２的三个吸热效应，在ＤＴＡ曲线上皆可显示其对应的峰形特征而得到判别。

Abstract: By applying on established DT A/T/EGD/GC on-line coupled simultaneoustechnique and relevant equipments,the trace siderite in the dolomite was identified in CO_2 andair and the purity of calcite was determined in air.The composition analysis of five-compo-nent mixed minerals of siderite,kaolinite,dolomite,calcite and quartz has been analyzed inN_2.The experimental results indicate:the mixed minerals of the dolomite/calcite(1:1)gen-erate thermal decomposition in CO_2, three endothermic effects of releasing CO_2 appear on theDTA curves,so the discrimination can be obtained by the characteristic peaks.