STUDY OF THE REACTION-MECHANISM AND COMPOSITION ANALYSIS OF MULTIPLE-COMPONENT MIXED MINERALS - DTA/T/EGD/GC ONLINE COUPLED SIMULTANEOUS TECHNIQUE

An established DTA/T/EGD/GC on-line coupled simultaneous technique and relevant equipment were applied to identify the micro impurity minerals - pyrite and siderite in two kinds of dolomite in air and N-2. The proportional five-component mixed minerals (siderite, kaolinite, dolomite, calcite and quartz) and the proportional six-component mixed minerals (pyrite and the above five minerals) were detected in N-2 and in air/CO2 (1:1) separately by applying DTA/EGD/GC and DTA/GC. The experimental results provide the basis for demonstration of the reaction mechanism of thermal decomposition of various gas-solid-phase minerals in N-2 and air/CO2. The compositions of six-component mixed minerals can be distinguished individually from the DTA/GC curves; reliable results are obtained.