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Method for analyzing ferrous iron in iron ore based on X fluorescence spectrum

An analysis method, a technique of fluorescence spectroscopy, applied in the field of analysis of II-valent iron in iron ore, can solve problems such as unrecognizable signals, achieve the effects of fast speed, good precision of the method, and avoid cumbersome steps

Inactive Publication Date: 2012-08-15
中华人民共和国北仑出入境检验检疫局
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Problems solved by technology

[0004] However, in the X-ray fluorescence spectrum of iron ore analysis, the two peaks of ferrous iron and ferric iron almost become one peak, making the original signal unrecognizable

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  • Method for analyzing ferrous iron in iron ore based on X fluorescence spectrum
  • Method for analyzing ferrous iron in iron ore based on X fluorescence spectrum
  • Method for analyzing ferrous iron in iron ore based on X fluorescence spectrum

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Embodiment Construction

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0015] A method for analyzing ferrous iron in iron ore based on X-ray fluorescence spectrum, comprising the following steps:

[0016] 1) Prepare a total amount of 0.5 g of FeO and Fe 2 o 3 Mixture series of mixed standard samples, in which the mass fraction of FeO is 0%, 24.85%, 51.68%, 74.85%, 100%, FeO and Fe 2 o 3 After mixing, it is ground in a vibrating grinder so as to be fully mixed. With 15 grams of borax as a substrate, it is pressed into a disc with a diameter of 38 mm and a thickness of about 10 mm in a hydraulic press as a sample. Test reagent FeO, Fe 2 o 3 All use high-purity grade. The instrument is German Bruker AXS-S8, tube voltage 30kV, tube current 116mA, end window rhodium target, spectroscopic crystal LiF200 and XS-55, collimator 0.17°, detector FC, scan step 0.018°, counting time 2.5~ 4.5s. K for iron β 、K β 2nd ...

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Abstract

The invention discloses a method for analyzing ferrous iron in an iron ore based on an X fluorescence spectrum. The method comprises the following steps: 1) mixing selected FeO and Fe2O3 in turn at different ratios, so as to obtain a plurality of mixed samples; performing scanning measurement on all the samples in turn by an X-ray fluorescence spectrograph; guiding measuring data into Matlab wavelet software in a computer; performing spectrum-unfolding analysis on an Lbeta1 line at 36.24 degrees and a Lalpha1 primary line at 37.22 degrees by selecting a haar wavelet, so as to respectively obtain a relation curve of the FeO content and the Lbeta1 line and a relation curve of the FeO content and an Lalpha1 line as a respective working curve; and performing the scanning measurement on an iron ore sample with an unknown FeO content and comparing obtained data with the respective working curves, so as to obtain the FeO content of the iron ore sample. The method has the advantages that the wavelet is used for analyzing an X fluorescence spectrum peak of the iron in the iron ore and the ferrous iron is separated from an overlapped peak of the ferrous iron and the ferric iron, so that the complex step of analyzing the FeO content according to the original wet method is avoided, the speed is high and the precision of the method is excellent.

Description

technical field [0001] The invention relates to an analysis method of iron ore, in particular to an analysis method of II-valent iron in iron ore based on X-ray fluorescence spectrum. Background technique [0002] In order to understand the oxidation state of iron in iron ore and determine the characteristics of iron ore, not only the total iron content but also the content of divalent iron should be analyzed in iron ore analysis. As far as sinter and pellets in iron ore are concerned, the amount of divalent iron contained in them has a great impact on the blast furnace. If the content of divalent iron is low, the mechanical strength of iron ore will be low, and iron ore will be easily pulverized and blocked. Blast furnace air path, thereby reducing the utilization rate of blast furnace. Therefore, the content of ferrous iron should be strictly controlled during sintering of fine iron ore. Moreover, the iron and steel smelting process, iron ore beneficiation, and iron ore ...

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Application Information

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IPC IPC(8): G01N23/223
Inventor 应海松张建波林力陈贺海
Owner 中华人民共和国北仑出入境检验检疫局
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