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Method for detecting total iron in iron ore based on laser-induced-breakdown spectroscopy

A technology of laser-induced breakdown and spectroscopy, which is used in measurement devices, material excitation analysis, material analysis by optical means, etc., can solve problems such as environmental pollution, and achieve simple data processing, easy operation, accuracy and precision. high effect

Inactive Publication Date: 2014-05-21
NORTHWEST UNIV
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Problems solved by technology

There are copper ions in the reagents used in flame atomic absorption method, which will pollute the environment to a certain extent.

Method used

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  • Method for detecting total iron in iron ore based on laser-induced-breakdown spectroscopy
  • Method for detecting total iron in iron ore based on laser-induced-breakdown spectroscopy
  • Method for detecting total iron in iron ore based on laser-induced-breakdown spectroscopy

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] This embodiment is a method for detecting total iron in iron ore based on laser-induced breakdown spectroscopy. Weigh 1.0000g of iron ore powder (GBW07822 GFe-1) with an electronic analytical balance, 5 parts each; add analytically pure ferric oxide powder to the iron ore powder to make different contents (0.0%, 10%, 20% %, 30%, 40%) iron ore powder samples, after being thoroughly mixed in an agate mortar, cover the bottom and periphery of the iron ore powder samples with polyethylene powder, and use 200Kgf / cm 2 Tablet preparation was performed for 2 minutes, and 5 samples were prepared as flakes with a diameter of about 2 cm and a thickness of about 5 mm.

[0026] Such as figure 1 As shown, the experimental device used in this embodiment is composed of a laser, an optical system, an EMCCD spectrometer, a sample stage, and a computer. In an ...

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Abstract

The invention discloses a method for detecting total iron content in iron ore by using an improved internal standard method combined with laser-induced-breakdown spectroscopy. The method comprises the following steps: adding different masses of analytically pure iron trioxide to a to-be-detected iron ore sample A, cladding and tabletting to obtain a sample B by using polyethylene powder; collecting data at different positions on the sample B by using a laser-induced-breakdown spectroscopy system; carrying out qualitative analysis on the iron ore by combining with characteristic spectral line information of an Fe element in a database for national institute of standards and technology (NIST); sorting out the characteristic spectral line of the Fe element; selecting FeI438.5813nm as an analytical line, and the MnI405.5210nm as an internal standard line according to the selection criteria of the analytic line and an internal standard line; building a linear equation by taking the strength difference of two spectral lines as a Y axis and the concentration gradient of Fe in the sample B as an X axis, wherein the intercept obtained from a straight line by extension and an X axis is the mass percent of the Fe element. The method is simple to operate, environment-friendly, easy to process data, and high in accuracy.

Description

technical field [0001] The invention relates to an analysis method for detecting total iron in iron ore based on laser-induced breakdown spectroscopy technology, which belongs to the field of analysis technology. Background technique [0002] Laser Induced Breakdown Spectroscopy (LIBS for short) is an emerging atomic emission spectroscopy technique. LIBS uses a high-energy pulsed laser to excite the sample to generate plasma, and the atomic and ion emission lines are obtained and analyzed by the spectrometer, and the elements in the sample are qualitatively and quantitatively analyzed by the position of the characteristic wavelength and the spectral intensity. LIBS technology has the characteristics of fast operation and simultaneous analysis of multiple elements. It has developed rapidly in recent years and is widely used in space development, archaeological research, geological exploration, military security and other fields. [0003] Iron ore is the main raw material for...

Claims

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Application Information

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IPC IPC(8): G01N21/63
CPCG01N21/718
Inventor 李华盛丽雯张天龙王康汤宏胜
Owner NORTHWEST UNIV
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