Method for quantitatively analyzing preferred mineral components based on XRD (X-Ray Diffraction)

Abstract

The invention discloses a method for quantitatively analyzing preferred mineral components based on XRD (X-Ray Diffraction), and belongs to the field of mineral quantitative analysis. The method comprises the following steps: correcting different degrees of preferred orientations of different crystal faces through multiple factors of each crystal face, and substituting the corrected diffracted intensity into a reference intensity method calculation formula to obtain the mass fraction of each component in the mixed mineral. According to the method, the mass fraction of each component in the mixed mineral can be accurately calculated, and a more reliable method is provided for quantitative analysis of the mineral.

Description

Technical Field

[0001] The invention relates to the technical field of component determination in minerals, in particular to a method for selecting mineral components based on XRD quantitative analysis. Background Art

[0002] Quantitative detection of minerals is of great significance in many fields such as geology and mining. It can help us determine the composition and structure of minerals, thereby accurately classifying minerals. In the process of mineral processing and smelting, quantitative measurement can help determine the best processing conditions, improve product quality and output, and reduce costs. Due to the complexity of the content of various substances in mineral samples, it is difficult to determine their content through conventional chemical and electron microscope tests. The traditional XRF method has limitations in its application in the mineral field due to the complexity of ore composition. For multi-component minerals, X-ray diffraction (XRD) has gradually become one of the most important analytical methods for qualitative and quantitative research.

[0003] During the rock deformation process, minerals will have preferred orientations, which can provide information about geodynamics and tectonic processes. Due to the different degrees of preference, the results of X-ray quantitative analysis will be affected to a certain extent. No matter how the flaky mineral samples are ground, they will have different degrees of preferred orientation. There is no method to correct the preferred orientation in the quantitative analysis of minerals, so an effective correction method is very necessary. In previous studies, there have been many methods to reduce the preferred orientation of samples before detection from the perspective of sample preparation, so as to perform accurate quantitative analysis, but these methods are often time-consuming and labor-intensive. In the published patents, chemical methods are mostly used for the analysis of mineral phases. For example, when CN116818981A determines the calcium phase in fluorite, different types of acid are used to dissolve the calcium phase separately, and then the phase content is calculated by chemical solution titration. This method is relatively complicated and has poor accuracy under the interference of impurity elements. The present invention is used in a dry environment throughout the process, and the material is dry powder. The experimental and calculation processes are simple, and the results are accurate and reliable. Summary of the invention

[0004] In order to solve the influence of preferred orientation on the quantitative analysis of ore and to more accurately perform quantitative analysis on the mineral components, the present invention adopts the following steps:

[0005] A method for quantitatively analyzing and selecting mineral components based on XRD, comprising the following steps:

[0006] (1) The preferred orientation of different crystal planes is corrected to different degrees through the multiplicity factor m of each crystal plane, and the corrected main peak diffraction intensity is brought into the calculation formula of the reference intensity method;

[0007] (2) Calculate the mass fraction of each component in the mixed mineral.

[0008] Preferably, the calculation process of step (1) of the present invention is as follows:

[0009]

[0010] In the formula, I k c is the corrected diffraction intensity, m is the multiplicity factor, n represents the order of the crystal planes arranged according to the diffraction angle, and takes 1, 2, ... n; t and c are not indices; m hkl represents the set of multiplicities of all statistical crystal plane indices; I n t The diffraction intensity caused by the preferred orientation of different crystal planes, k is the ratio of the diffraction intensity after correction to the diffraction intensity before correction.

[0011] Preferably, the calculation process of step (1) of the present invention is as follows:

[0012]

[0013] Where W n is the mass fraction of the mineral component to be tested, I c n is the corrected diffraction intensity, r n is the reference intensity of the mineral component to be analyzed, I c j is the diffraction intensity corrected for different mineral components in the sample, r j It is the reference intensity of different mineral components in the sample.

[0014] Beneficial effects of the present invention:

[0015] The method of the present invention is applicable to the quantitative analysis of various types of mixed mineral samples, and can improve the accuracy and simplicity of mineral quantitative analysis. The present invention reduces the error caused by the preferred orientation by correcting the preferred orientation, and can more accurately perform the quantitative analysis of mineral components; the method is simple and reliable, and is conducive to use in the preferred mineral. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a flow chart of the method of the present invention;

[0017] Figure 2 The XRD diagram of the ore sample in the embodiment. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited to the contents described above.

[0019] Example 1

[0020] This embodiment takes a mixed ore sample (calcite and dolomite) as an example for explanation. The particle size of the powder after grinding ranges from 1 to 100 μm, and the powders are mixed at a mass fraction ratio of 5:5.

[0021] A method for quantitatively analyzing and selecting mineral components based on XRD, specifically comprising the following steps:

[0022] (1) The mixed sample was subjected to X-ray diffraction analysis to obtain a diffraction spectrum. The jade9 software was used to analyze the phase and obtain the diffraction intensity of each peak. Since calcite and dolomite belong to the same trigonal system, the multiplicity of each crystal plane was obtained by consulting the data. The above value was substituted into the following formula (1) to calculate the main peak diffraction intensity after correction:

[0023]

[0024] The parameters are shown in Table 1. After substituting the data, the specific results are as follows:

[0025]

[0026] Table 15:5 Dolomite calibration data and calibration results after mixing

[0027]

[0028] (2) Substituting the corrected main peak diffraction intensity into formula (2), the corrected dolomite mass fraction can be obtained:

[0029]

[0030] (3) The mass fraction of each component in the mixed mineral is calculated, and the uncorrected diffraction intensity value and the reference intensity are substituted into formula (2) to obtain the uncorrected calculation result:

[0031]

[0032] After substitution into the calculation, the mass fraction of dolomite after correction was 51.48wt.%, with an error value of only 1.48wt.%, while the result directly calculated by the reference strength method was 39.80wt.%, with an error value of 10.2wt.%, which is much more accurate than the result without correction.

[0033] The above method for quantitative analysis of preferential minerals will greatly improve the accuracy. At the same time, the calculation process is simple and easy, which is conducive to its promotion and implementation in the field of quantitative analysis of preferential minerals.

Claims

1. A method for quantitatively analyzing and selecting mineral components based on XRD, characterized in that: The following steps are involved: (1) The preferred orientation of different crystal planes is corrected to different degrees through the multiplicity factor m of each crystal plane, and the corrected main peak diffraction intensity is brought into the calculation formula of the reference intensity method; (2) Calculate the mass fraction of each component in the mixed mineral.

2. The method for selecting mineral components based on XRD quantitative analysis according to claim 1, characterized in that: The calculation process of step (1) is as follows: In the formula, I k c is the corrected diffraction intensity, m is the multiplicity factor, n represents the order of the crystal planes arranged according to the diffraction angle, and takes 1, 2, ... n; t and c are not exponents; m hkl represents the set of multiplicities of all statistical crystal plane indices; I n t The diffraction intensity caused by the preferred orientation of different crystal planes, k is the ratio of the diffraction intensity after correction to the diffraction intensity before correction.

3. The method for selecting mineral components based on XRD quantitative analysis according to claim 1, characterized in that: The calculation process of step (1) is as follows: Where W n is the mass fraction of the mineral component to be tested, I c n is the corrected diffraction intensity, r n is the reference intensity of the mineral component to be analyzed, I c j is the diffraction intensity corrected for different mineral components in the sample, r j It is the reference intensity of different mineral components in the sample.

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