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A rapid identification and quantitative detection method for niobium-rich minerals

A mineral and fast technology, applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of inability to find, positioning, large molecular weight differences, single gray value, etc., to reduce labor intensity, improve efficiency, and ensure stability. Effect

Active Publication Date: 2022-04-01
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the gray value of niobium-rich minerals is not like zircon and monazite, the gray value is relatively single, and it is impossible to accurately find and locate them by simply adjusting the gray value
In view of the complex composition of niobium-rich minerals, large molecular weight differences, relatively large gray scale changes, and small particles, there is currently no detection method for rapid identification and accurate positioning of niobium-rich minerals in a wide field of view

Method used

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  • A rapid identification and quantitative detection method for niobium-rich minerals
  • A rapid identification and quantitative detection method for niobium-rich minerals
  • A rapid identification and quantitative detection method for niobium-rich minerals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 (the sample area to be tested is 1370mm 2 )

[0042] (1) Preparation of samples to be tested: The samples to be tested are minerals from the Baiyun Obo rare earth mining area, which are prepared into geological thin slices and coated with carbon.

[0043] (2) Preparation of grayscale standard samples: stick the selected standard niobium-containing samples and pyrite sample particles on the glass plate with double-sided adhesive tape, put them on the mold, and pour the resin. After the resin is solidified, the sample target is removed from the mold. Grind and polish the sample with a grinding and polishing machine until the sample particles reveal a smooth plane, then use 9 μm, 3 μm, and 1 μm diamond abrasive paste to finely polish the sample to obtain a highly flat sample surface, and then wash the sample in alcohol and deionized water successively. Ultrasonic cleaning is performed to obtain a clean surface, and finally the dried sample is carbon-plated t...

Embodiment 2

[0053] Steps (1)-(2) are the same as in Embodiment 1.

[0054] (3) Gray scale reference value setting: fix the standard niobium-containing sample and pyrite sample together with the sample to be tested on the sample stage with carbon conductive glue, and put it into the scanning electron microscope. Under the conditions of scanning electron microscope voltage of 15kV and current of 5nA, under the premise of clear focus, adjust the brightness and contrast of the backscattered signal image of the pyrite sample, and set its gray value to 18000.

[0055] (4) Grayscale standard threshold setting: Under the conditions of scanning electron microscope voltage 15kV, current 5nA and the same brightness and contrast as step (3), under the premise of clear focus, detect the grayscale standard threshold value of the standard niobium-containing sample, the grayscale The degree standard threshold is 20000-26000.

[0056] (5) One-time fast energy spectrum acquisition: Under the conditions of...

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Abstract

The invention relates to a method for rapid identification and quantification of niobium-rich minerals, comprising the following steps: preparation of a sample to be tested, preparation of a gray scale standard sample, setting of a gray scale reference value, setting of a gray scale standard threshold value, one fast energy spectrum acquisition, two Sub-slow energy spectrum acquisition, determination of niobium-rich mineral composition and quantitative analysis of niobium-rich mineral elements. In the present invention, by determining the setting of the backscattering gray threshold of niobium-containing minerals and the judgment of the particle size, two energy spectrum collections are set up, so as to realize the rapid identification of niobium-rich minerals and the accurate automatic analysis of the components, which greatly relieves the researchers. The labor intensity is reduced, and the efficiency and accuracy of test analysis are improved.

Description

technical field [0001] The invention relates to a mineral detection method, in particular to a method for rapid identification and quantification of niobium-rich minerals. Background technique [0002] Niobium has excellent properties such as high melting point, high temperature resistance, corrosion resistance, superconductivity, etc. It is widely used in many fields such as steel, aerospace, superconducting materials, cutting-edge electronics, medical treatment, nuclear industry, etc. It is an indispensable key rare in the national defense industry Metal is an important strategic resource. Due to the particularity of multi-element symbiosis in niobium-rich minerals (such as the Baiyan Obo Mine), the extraction of niobium resources is difficult and has not been effectively utilized. Therefore, it is of great significance to study the occurrence status of niobium-rich mineral resources. [0003] At present, chemical analysis, scanning electron microscopy, X-ray energy spect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/2251G01N23/2202G01N23/20091G01N23/203
CPCG01N23/2251G01N23/2202G01N23/20091G01N23/203
Inventor 原江燕陈意李晓光
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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