On-line iron-ore slurry monitoring for real-time process control of pellet making processes using laser-induced breakdown spectroscopy: graphitic vs. total carbon detection
On-line iron-ore slurry monitoring for real-time process control of pellet making processes using laser-induced breakdown spectroscopy: graphitic vs. total carbon detection
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DOI：
10.1016/s0584-8547(01)00227-0
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发表时间：
2001-06-29
影响因子：
3.3
通讯作者：
Turmel, S
中科院分区：
文献类型：
--
作者：
Barrette, L;Turmel, S
铁矿球团的化学成分对其质量和商业价值有重要影响。激光诱导击穿光谱（LIBS）技术已经在工业制粒厂进行了广泛的在线测试。它成功地测量了不同铁矿矿浆在过滤和造球前的Si、Ca、Mg、Al和石墨C的含量。对于这种特殊的应用，该技术的灵敏度与从专用化学实验室获得的灵敏度相比较。但LIBS技术的真正优势在于，与超过1小时的周期性采样和标准分析延迟相比，LIBS技术的结果是连续和实时的。因此，LIBS提供了更有代表性的过程状态读数-特别是当快速扰动发生时-并允许过程优化和质量改进。在这项工作中，特别注意的是，具有特定设置的检测系统可以直接测量石墨碳（焦渣）或总碳（焦渣、助熔剂和天然碳酸盐）。石墨碳含量是决定颗粒生产成本和最终商业价值的关键参数。LIBS是一种灵敏的技术，可以检测到微小的变化。但矩阵效应会影响谱线，有时难以建立通用的校准曲线。通过使用多变量校准来纠正矩阵效应，并根据每次测量的专业知识评估置信度，可以部分克服这个问题。目前的研究目标是开发用于连续工业用途的商用设备。(C) 2001 Elsevier Science B.V.版权所有
Chemical composition of iron-ore pellets has a significant impact on their quality and commercial value. Laser-induced breakdown spectroscopy (LIBS) technique has been extensively tested on line, at industrial pelletizing plants. It proved successful at measuring Si, Ca, Mg, Al and graphitic C contents of different iron-ore slurries prior to filtration and pelletizing. For this specific application, the sensitivity of the technique compares with the one obtained from dedicated chemical laboratories. But the real advantage of LIBS technique is that the results are delivered continuously and in real time compared to periodic sampling and standard analytical delays of more than 1 h. Consequently, LIBS gives a more representative reading of the state of the process - particularly when rapid perturbations occur - and allows process optimization and quality improvement. In this work, special attention was given to the fact that the detection system, with specific settings, gives direct measurement for either graphitic carbon (coke breeze) or total carbon (coke breeze, flux and natural carbonate). Graphitic carbon content is a key parameter for both the pellet production cost and its final commercial value. LIBS is a sensitive technique that can detect small variations. But matrix effects affect the spectral lines and it is sometimes difficult to establish universal calibration curve. This problem is partially overcome by the use of a multivariable calibration that corrects for matrix effects and evaluates a confidence level based on expertise for each measurement. Current research is aimed at the development of commercial equipment for continuous industrial use. (C) 2001 Elsevier Science B.V. All rights reserved.