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Method for identifying aragonite by means of X-ray powder crystal diffraction

An X-ray and aragonite technology, applied in the detection field, can solve the problems of complex operation of the identification method, rare and rare aragonite, unstable aragonite, etc., and achieve the effects of uniform distribution of elements, elimination of stress, and improvement of flatness

Inactive Publication Date: 2018-08-24
曹姝旻
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In nature, aragonite is rare and valuable. Aragonite is unstable and often turns into calcite. Therefore, it needs to be screened and identified. The existing identification methods are complicated to operate.

Method used

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  • Method for identifying aragonite by means of X-ray powder crystal diffraction
  • Method for identifying aragonite by means of X-ray powder crystal diffraction
  • Method for identifying aragonite by means of X-ray powder crystal diffraction

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Effect test

Embodiment 1

[0035] A method for identifying aragonite by X-ray powder crystal diffraction, comprising:

[0036] After the aragonite sample is cleaned and air-dried, it is ground at 0° C. until the particle size of the aragonite sample after grinding is 10 um ≤ 15 um, and the aragonite sample powder is obtained.

[0037] Mix the aragonite sample powder with alcohol, ultrasonically disperse for 2s under the condition of ultrasonic frequency of 23KHz, and then coat it on the glass sample. The thickness of the aragonite sample coated on the glass sample is 1.6mm. After drying, X-ray powder diffraction is carried out by SIMENSD500 X-ray diffractometer under the conditions of tube voltage 35kV, tube current 35mA, 2θ scanning speed 2° / s, scanning range 24-73°, and the sample X-ray powder diffraction data.

[0038] Compare the X-ray powder crystal diffraction data of the obtained aragonite sample with the national standard X-ray powder crystal diffraction data of aragonite for identification.

Embodiment 2

[0040] A method for identifying aragonite by X-ray powder crystal diffraction, comprising:

[0041] After the aragonite sample is cleaned and air-dried, it is ground at 0° C. until the particle size of the aragonite sample after grinding is 10 um ≤ 15 um, and the aragonite sample powder is obtained.

[0042] Spray the glue in alcohol, mix it with the ground aragonite sample, disperse it ultrasonically for 2 seconds under the condition of ultrasonic frequency of 23KHz, and apply it to the glass sample. The thickness of the aragonite sample coated on the glass sample is 1.6 mm, after coating, after drying at 50°C, X-ray powder is carried out by SIMENSD500 X-ray diffractometer under the conditions of tube voltage 35kV, tube current 35mA, 2θ scanning speed 2° / s, scanning range 24-73° Crystal diffraction to obtain sample X-ray powder crystal diffraction data.

[0043] Wherein, the total amount ratio of the glue solution to the ground aragonite sample is 1:13, and the volume ratio of...

Embodiment 3

[0046] A method for identifying aragonite by X-ray powder crystal diffraction, comprising:

[0047] After the aragonite sample is cleaned and air-dried, it is ground at 3° C. until the particle size of the aragonite sample after grinding is 11 um≤14 um, and the aragonite sample powder is obtained.

[0048] Spray and add glue in alcohol, mix it with the ground aragonite sample, ultrasonically disperse for 2s under the condition of ultrasonic frequency of 25KHz, and then apply it to the glass sample, the thickness of the aragonite sample coated on the glass sample is 2mm , after coating and drying at 54°C, X-ray powder crystals were carried out by SIMENSD500 X-ray diffractometer under the conditions of tube voltage 35kV, tube current 35mA, 2θ scanning speed 2° / s, scanning range 24-73° Diffraction to obtain sample X-ray powder crystal diffraction data.

[0049] Wherein, the total amount ratio of the glue solution to the ground aragonite sample is 1:14, and the volume ratio of th...

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Abstract

The invention provides a method for identifying aragonite by means of X-ray powder crystal diffraction, and relates to the technical field of detection. The method for identifying the aragonite by means of X-ray powder crystal diffraction comprises the steps of cleaning an aragonite sample, drying in the air, grinding at -5 to 3 DEG C until the particle size is less than or equal to 20mu m, mixingthe ground product with alcohol, carrying out ultrasonic dispersion for 1-2s, coating a glass sample piece with the product subjected to ultrasonic dispersion, carrying out X-ray powder crystal diffraction, comparing X-ray powder crystal diffraction data of the obtained aragonite sample with the national standard X-ray powder crystal diffraction data of the aragonite, and identifying. The methodis simple to operate and controllable, and the results are accurate and reliable.

Description

technical field [0001] The invention relates to the technical field of detection, and in particular to a method for identifying aragonite by X-ray powder crystal diffraction. Background technique [0002] Aragonite, a carbonate mineral. Also known as aragonite, it is homogeneous and multi-like with calcite. The difference between the two is that aragonite is orthorhombic, and calcite is trigonal. Aragonite crystals are columnar or spear-shaped, and triple crystals with pseudo-hexagonal symmetry are common. The aggregates are mostly in the shape of shell, oolitic, bean, and pellet. Usually white, yellowish white. Vitreous luster, the fracture is grease luster. With incomplete plate cleavage. Conchoidal fracture. Mohs hardness 3.5 ~ 4.5. The specific gravity is 2.9~3.0. Aragonite is mainly formed under exogenous conditions, produced in modern seabed sediments or clay; in limestone caves; it can also be formed in endogenous processes, produced in hot spring deposits and...

Claims

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Application Information

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IPC IPC(8): G01N23/20
CPCG01N23/20
Inventor 曹姝旻
Owner 曹姝旻
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