Assessment of Three Spectroscopic Techniques for Rapid Estimation of Calcite in Copper Ore

作者：Escarate Pedro^*; Guesalaga Andres R; Albertini Valerio Rossi; Bailo Daniele

来源：IEEE Transactions on Instrumentation and Measurement, 2010, 59(7): 1911-1917.

DOI：10.1109/TIM.2009.2028774

• Calcite
• copper
• diffraction
• fluorescence
• Raman
• spectroscopy

This paper presents the assessment of three spectroscopic techniques, i.e., Raman spectroscopy (RS), ultraviolet fluorescence (UVF) spectroscopy, and energy-dispersive X-ray diffraction (ED-XRD), for measuring calcite (CaCO(3)) concentration in copper ore. The results for the three methods are compared in terms of their correlation coefficient R(2) and prediction error (root-mean-square error of prediction, RMSEP). These approaches substantially shorten the measurement time with respect to current laboratory procedures from 300 min down to 1, 15, and 9 min for RS, ED-XRD, and UVF, respectively, while preserving a good accuracy level (RMSEP < 0.577). Prediction models were calibrated and validated for the three techniques, using the correlation coefficients R(c)(2) and R(v)(2), the error of prediction (RMSEP), and the error of calibration (root-mean-square error of calibration, RMSEC). R(v)(2) values of 0.90, 0.88, and 0.94 were obtained for the RS, UVF, and ED-XRD models, respectively. The calibration and validation were performed for calcite concentrations ranging from 2.9% to 10.7%, and although the ED-XRD model performed slightly better than its RS counterpart, the time taken by the latter is significantly shorter than that by the other two, representing a good candidate for online estimation of calcite concentration.

• 出版日期2010-7