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Energy dispersion X-ray spectrum-based analysis method for phases of fly ash

A technology of X-ray spectroscopy and energy dispersion, which is used in the field of environmental protection (solid waste utilization) and material analysis and testing. Effects with sufficient resolution and particle count

Active Publication Date: 2016-01-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that fly ash contains a wide variety of phases with significant content differences, the coexistence of crystalline and amorphous states, and the distribution of phases also has a great impact on the reactivity, it is difficult to carry out traditional analysis and testing methods. A comprehensive analysis of
Taking quantitative X-ray diffraction analysis as an example, this method can only measure the content of crystalline phases and the total amount of amorphous phases, but cannot further subdivide amorphous phases, nor can it know the various phases. spatial distribution of

Method used

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  • Energy dispersion X-ray spectrum-based analysis method for phases of fly ash
  • Energy dispersion X-ray spectrum-based analysis method for phases of fly ash
  • Energy dispersion X-ray spectrum-based analysis method for phases of fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1. Analysis of the phase type and spatial distribution of a kind of low-calcium fly ash. Follow the steps below to analyze:

[0032] (1) Using X-ray fluorescence spectroscopy to analyze the chemical composition of low-calcium fly ash. The test results show that the chemical composition of fly ash is: SiO 2 45.90%, Al 2 o 3 37.30%, CaO5.33%, Fe 2 o 3 2.84%, SO 3 1.74%, MgO1.33%, K 2 O0.61%, Na 2 O0.35%, TiO 2 1.36%. According to the above test results, it is preliminarily determined that the elements that need to collect energy spectrum distribution images for this kind of fly ash are: Si, Al, Ca, Fe, S, Mg, K, Na, Ti, O.

[0033] (2) Analyze the mineral composition of low-calcium fly ash by X-ray diffraction, the results are as follows figure 2 shown. The test results show that the crystalline phase in fly ash is mainly mullite (Al 6 Si 2 o 13 ), sillimanite (Al 2 SiO 5 ) CaSO 4 2H 2 O, SiO 2 and Al 2 o 3 . The mantou peak located in t...

Embodiment 2

[0039] Embodiment 2. Analysis of the phase type and content of a low-calcium fly ash. Follow the steps below to analyze:

[0040] (1) Steps (1)-(3) are the same as in Example 1.

[0041] (2) Select a typical area in the fly ash sample, collect backscattered electron images and energy spectrum distribution images of Si, Al, Ca, Fe, S, Mg, K, Na, Ti, F, O elements, the results are as follows Figure 7 shown. It can be seen that each element has different degrees of enrichment. Among them, the white spots appearing in the energy spectrum distribution image of Si, Al, O three elements have high brightness and high enrichment degree; Ca, Mg elements are next; S, K, Fe, Na, Ti, F elements The number of white spots appearing in the spectrum image is less. Considering that the observed results of the element energy spectrum surface distribution images are very similar to the rules reflected in Example 1, therefore, only for Figure 7 Some typical phases in the fly ash test area s...

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Abstract

The invention relates to an energy dispersion X-ray spectrum-based analysis method for phases of fly ash. The method comprises the following concrete steps: (1) analyzing chemical composition of the fly ash through a chemical process or X-ray spectrofluorimetry; (2) analyzing mineral composition of the fly ash through X-ray diffraction; (3) determining the kinds of elements requiring acquisition of images of power spectrum surface distribution; (4) acquiring backscattered electron images and element power spectrum surface distribution images of the fly ash and carrying out power spectrum point analysis on main phases; and (5) designing a phase analysis method, comprehensively processing the power spectrum surface distribution images of every elements in a same area and then removing noise in analysis results so as to obtain phase-split pseudo-color images and phase analysis results of the fly ash. The phase analysis method provided by the invention is effective to both crystalline and amorphous phases and sensitive to low-content phases. The method can be used for analyzing the kinds of phases composing the fly ash, calculating the volume percentage contents of the phases and observing spatial distribution of the phases.

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 in particular relates to a phase analysis method of fly ash based on energy dispersive X-ray spectrum. Background technique [0002] Fly ash is an active mineral fine powder resource, which is widely used as an auxiliary cementitious material in the production of cement, mortar and concrete. However, due to differences in coal types, coal sources, boiler types, capacity, operating conditions, and dust collection and ash discharge methods, the properties of fly ash fluctuate greatly, mainly manifested in chemical composition, phase composition, density, particle shape, etc. The appearance, fineness and other properties are different. Among them, the phase composition has the greatest influence on the pozzolanic reactivity of fly ash. Therefore, people use various methods such as X-ray diffraction and chemical ...

Claims

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Application Information

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IPC IPC(8): G01N23/223G01N23/20G01N23/203
Inventor 吴丹琳王培铭刘贤萍袁勇
Owner TONGJI UNIV
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