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Coal gangue phase analysis method based on energy dispersion X-ray spectrum

A technology of X-ray spectroscopy and energy dispersion, which is applied in the field of environmental protection (utilization of solid waste) and the field of material analysis and testing, can solve the problem that the type and content of amorphous phase cannot be obtained

Active Publication Date: 2015-12-23
TONGJI UNIV
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  • Application Information

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Problems solved by technology

[0004] In the past, the mineral composition of coal gangue was mostly tested by various quantitative X-ray diffraction techniques. These methods can measure the types and contents of crystalline phases in undisturbed coal gangue and activated coal gangue, but cannot obtain amorphous phases. The types and contents of phases, and the spatial distribution of various phases in coal gangue

Method used

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  • Coal gangue phase analysis method based on energy dispersion X-ray spectrum
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  • Coal gangue phase analysis method based on energy dispersion X-ray spectrum

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1. Analysis of the phase type and spatial distribution of a kind of activated coal gangue. Follow the steps below to analyze:

[0034] (1) Using X-ray fluorescence spectroscopy to analyze the chemical composition of activated coal gangue. The test results show that the chemical composition of this activated coal gangue is: SiO 2 55.80%, Al 2 o 3 17.70%, CaO13.80%, Fe 2 o 3 3.33%, K 2 O1.99%, MgO1.17%, Na 2 O0.46%, SO 3 0.41%, TiO 2 0.60%. According to the above test results, it is preliminarily determined that the following elements need to collect energy spectrum distribution images: Si, Al, Ca, Fe, K, Mg, Na, S, Ti, O.

[0035] (2) X-ray diffraction was used to analyze the mineral composition of activated coal gangue, the results were as follows figure 2 shown. The test results show that the crystalline substances in the activated coal gangue are mainly quartz (SiO 2 ), limestone (CaCO 3 ), calcium aluminate feldspar (Ca 2 Al 2 SiO 7 ), ma...

Embodiment 2

[0041] Embodiment 2. Analysis of the phase type and content of a kind of activated coal gangue. Follow the steps below to analyze:

[0042] (1) Steps (1)-(3) are the same as in Example 1.

[0043] (2) Select a typical area in the activated coal gangue sample, and collect backscattered electron images and energy spectrum distribution images of Si, Al, Ca, Fe, K, Mg, Na, S, F, Ti and O elements. The results are as follows: Figure 7 shown. It can be seen that signals are detected on the energy spectrum distribution images of each element. Among them, the number of white spots appearing in the energy spectrum images of O, Si and Al elements is large, and the enrichment degree is large; Ca and K elements are next; S, Fe, Na, Ti, F and Mg elements appear in the energy spectrum images of less white spots. In view of the observation results of the elemental energy spectrum surface distribution image are very similar to the law reflected in Example 1, therefore, in Figure 7 In t...

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Abstract

The invention relates to a coal gangue phase analysis method based on an energy dispersion X-ray spectrum. The method includes the specific steps of firstly, analyzing the chemical composition of coal gangue through chemical analysis or X-ray spectrofluorimetry; secondly, analyzing the mineral composition of coal gangue through X-ray diffraction; thirdly, determining types of elements where energy spectrum face distribution images need to be collected; fourthly, shooting backscattered electron images and element energy spectrum face distribution images of coal gangue, and analyzing and observing composition of main phases through energy spectrum points; fifthly, designing a phase analysis method, comprehensively processing the energy spectrum distribution images of all the elements in the same area, removing noise in the analysis result, and obtaining split phase pseudocolor images and the phase analysis result of coal gangue. The phase analysis method can be used for type analysis, volume percentage content calculation and space distribution observation in coal gangue and activated coal gangue. The method is effective for both the crystalline state phase and the amorphous state phase, and is sensitive to the low-content phase.

Description

technical field [0001] The invention belongs to the field of environmental protection (utilization of solid waste) and the field of material analysis and testing, and specifically relates to a coal gangue phase analysis method based on energy dispersive X-ray spectrum. Background technique [0002] Coal gangue is the carbonaceous rock discharged during the production process of coal mine development and excavation, coal mining and coal washing. Coal gangue is generally rich in Al and Si elements, and a small amount of Ca element, and its chemical composition is similar to the Ca-Al-Si system that constitutes cement. Therefore, the use of coal gangue in the production of building materials such as cement, mortar and concrete is one of the important ways to realize the large-scale and high value-added utilization of coal gangue. [0003] A large number of studies have shown that the reactivity of undisturbed coal gangue is very low, and it needs to be activated by heating, gr...

Claims

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Application Information

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IPC IPC(8): G01N23/00G01N23/203
Inventor 吴丹琳王培铭袁勇刘贤萍
Owner TONGJI UNIV
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