A Method for Measuring Three Ratio Values of Cement Raw Meal Based on Partial Least Squares Method
A technology of cement raw meal and measurement method, applied in material excitation analysis, thermal excitation analysis, etc., can solve the problems of mutual interference of spectral lines, limited application, low precision, etc., and achieve the effect of improving prediction accuracy and reducing adverse effects
Active Publication Date: 2019-06-18
TSINGHUA UNIV
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Problems solved by technology
However, due to the obvious matrix effect of this technology, the accuracy of direct measurement of material composition is not high, which also limits the application of this technology in the online detection of cement raw meal
[0005] At present, the LIBS technology used in the analysis of cement raw meal in the existing literature mostly adopts univariate analysis method or multiple regression analysis method, but the effect is still not ideal.
This is because in the LIBS spectrum of cement raw meal analysis, under the influence of the matrix effect, the spectral lines of each element interfere with each other, so the fitting accuracy of the traditional univariate regression method is poor, and the prediction effect is not satisfactory.
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Embodiment 1
[0046] A method for measuring the three rate values of cement raw meal based on the spectral standardization method,
[0047] 1) First, eleven kinds of standard cement raw meal samples with known mass concentrations of each element were used for analysis. The mass concentrations and volatile content of the main elements of each cement sample are shown in Table 1. The laser-induced plasma spectroscopy system was used to detect the cement samples, and the spectral lines of a group of cement raw meal samples with known mass concentrations of each element were obtained.
[0048] Table 1. Composition of eleven cement raw meal standard samples
[0049]
[0050] 2) After obtaining the sampling spectrum, for each sample, find out the corresponding variables in the regression model. For the spectrometer used in the laboratory, the spectral lines shown in Table 2 are selected as the elemental characteristic spectral lines. The selection principle is clear spectral lines, high sig...
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The invention provides a cement raw meal three moduli measuring method based on partial least squares, relating to a method for detecting material components by laser induced plasma spectroscopy. The method comprises the following steps: firstly detecting cement raw meal calibration samples with known components by adopting an LIBS system and building calibration models of element concentration ratio and characteristic spectrum line intensity ratio by utilizing a spectrum standardization method according to the obtained characteristic spectrum line intensity; then carrying out online detection on the samples to be detected and obtaining LIBS spectra, judging the element concentration ratio through the regression results and then determining the three moduli of cement raw meal by substituting the spectrum line information obtained through measurement into the built calibration models. The method has the effects of taking full advantage of the spectrum line information obtained by the LIBS spectra, considering the influence of the interference elements on the measuring results and reducing the interference of matrix effects and has the characteristics of good goodness of fit, strong repeatability and high prediction accuracy compared with traditional univariate calibration methods.
Description
technical field [0001] The invention relates to a method for measuring the three ratio values of cement raw meal. Specifically, the basic principle of the method is to use laser-induced plasma spectroscopy (abbreviated as LIBS) to measure the three-rate value of the cement sample to be tested. Background technique [0002] In the process of cement production, according to the composition of different cement raw materials, real-time adjustment of working parameters will help improve firing efficiency, save energy and reduce pollutant emissions. However, traditional analysis methods mostly use off-line analysis, which has disadvantages such as poor representativeness of sampling and sample preparation, slow analysis speed, and cumbersome procedures. Therefore, cement manufacturers are in urgent need of an on-line rapid detection method for cement raw meal with high precision and three rate value analysis. [0003] At present, the commonly used technology in the on-line det...
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IPC IPC(8): G01N21/73
CPCG01N21/73
Inventor 王哲尹华亮袁廷璧侯宗余李政
Owner TSINGHUA UNIV