1.The Key Laboratory of Mineral Processing Engineering and Comprehensive Utilization in Qinghai,Xining 810007,China; 2.Institute of Technology,Western Mining Co.,Ltd.,Xining 810007,China
Abstract：The standard spectrum of origin flotation zinc sulfide concentrate was firstly established. The zinc sulfide concentrate with particle size of 200-230 mesh (74-61 μm) was quantitatively analyzed using national standard method GB/T 8151-2012. The content of major components (Zn, Fe and S) was determined. Then, 8 mg of zinc sulfide concentrate sample with particle size of 200-230 mesh was analyzed on differential thermal analyzer using standard alumina crucible as reference crucible at heating rate of 10 ℃/min. The differential thermal analysis standard spectrum of origin flotation zinc sulfide concentrate with two obvious exothermic peaks at 450 ℃ and 680 ℃ was obtained. Then, the differential thermal analysis spectrum of unknown zinc concentrate was established under same experimental conditions. Finally, the physical and chemical properties of zinc sulfide concentrate were identified. The differential thermal analysis spectrum of unknown zinc concentrate was compared with the standard spectrum of origin flotation zinc sulfide concentrate. The physical and chemical properties of unknown zinc concentrate could be judged according to the difference of differential thermal spectrum, while the quantitative analysis was not required. Four zinc concentrate samples from different ore sources were tested by differential thermal analysis. The spectral comparison indicated that the differential thermal analysis (DTA) curves of zinc concentrates from Gansu Juke and Xizang trended to normal, but the zinc concentrates from Gansu 1# ore and Gansu 2# ore had no standard exothermic peak, and the peak area was relatively small. Therefore, through the DTA comparison with standard origin flotation zinc sulfide concentrate, it could be intuitively and rapidly judged that the zinc concentrates from Gansu 1# ore and Gansu 2# ore were artificially prepared fake ore, i.e., not the zinc sulfide concentrate. The study provided reference to rapidly and intuitively identify the physical and chemical properties of zinc sulfide concentrates. The proposed method had certain significance to reduce the risk in purchase and acceptance of zinc smelting.
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