Chlorite mineral variety identification method based on Raman spectroscopy

Abstract

The invention belongs to the technical field of chlorite mineral identification, and discloses a chlorite mineral variety identification method based on Raman spectroscopy. The method comprises the steps of acquiring a Raman spectrum of a chlorite mineral sheet; carrying out smooth denoising processing on the spectral data, and determining the position of a characteristic absorption peak by adopting Voigt function fitting; carrying out spectrum curve smooth data preprocessing on the raman spectral data in a data processing terminal, and carrying out peak position fitting and positioning of thecharacteristic absorption peak on a curve passing through a spectrum data smooth link; and quickly identifying the subspecies category of the chlorite mineral according to the linear statistical relationship between the position of the characteristic absorption peak and the chlorite iron content and the position of the characteristic absorption peak. The relative iron and magnesium content information of the chlorite mineral in an alteration zone is obtained through Raman spectroscopy, the time required for obtaining the iron and magnesium content through a traditional electronic probe methodis shortened, time and labor are saved, and meanwhile expenditure is saved.

Description

technical field [0001] The invention belongs to the technical field of chlorite mineral identification, in particular to a method for identifying chlorite mineral types based on Raman spectroscopy. Background technique [0002] At present, the identification of iron-rich and magnesium-poor and magnesium-rich and iron-poor subspecies of chlorite minerals mainly includes electron probe microanalysis, electron microscope observation and near-infrared spectroscopy analysis. The disadvantages in NIR spectroscopy are: poor data quality. The disadvantage of the electron microscope analysis method is that only the appearance can be observed. [0003] The electron probe instrument irradiates the surface of the sample with the help of a finely focused electron beam, thereby exciting the X-rays of the sample elements, and then uses the wavelength dispersive spectrum detection equipment and the counting system to determine the wavelength, intensity, etc. of the ray Then, the element t...

AI Technical Summary

Problems solved by technology

Disadvantages in NIR spectroscopy are: Poor data quality

The disadvantage of the electron microscope analysis method is that it can only observe the shape

[0006] (1) The existing electronic probe equipment is a large-scale laboratory instrument with high accuracy, but the data processing and calculation are cumbersome, and professional mineralogy calculation technology is required

[0007] (2) In the prior art, electronic probes are mainly used for the analysis of mineral subtypes, and the process of sample preparation involves surface carbon spraying, and the analysis cost is also more expensive; traditional mineral Raman spectroscopic analysis mainly uses standard Because the traditional mineralogy research does not consider the cost, it focuses on the use of electron probes for precise analysis, and the identification of mineral subtypes in investigative work for a large number of samples has not yet been carried out using Raman spectroscopy. analyze

[0009] (4) Existing Raman mineral identification only distinguishes between mineral categories, and there is no report on the method for distinguishing related subcategories

[0011] Difficulty in solving the above technical problems: The electronic probe instrument has a precise and complex structure, including electron guns, focusing and accelerating components, X-ray detection devices, vacuum sample chambers, etc.

Therefore, it is not feasible to directly try to simplify the test scheme of electron probe instrument

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