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A coesite preparation method

A technology of quartz and ball milling, applied in chemical instruments and methods, ultra-high pressure process, single crystal growth, etc., can solve the problems of no reflection and difficulty in conforming to the objective and actual conditions of surface coesite

Inactive Publication Date: 2006-11-22
NORTHEAST DIANLI UNIVERSITY
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

Coes synthesized coesite by the static high pressure method, and the synthesis conditions did not reflect the influence of local high pressure, local high temperature and shear force in the collision of the earth's plates, so it is difficult to meet the objective reality of surface coesite production

Method used

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Experimental program
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Embodiment

[0027] A method for preparing coesite is composed of the following high-energy mechanical ball milling method and static high pressure method, followed by the following steps:

[0028] (1) High-energy mechanical ball milling

[0029] Put the α-quartz powder with a weight percentage of 99% and stainless steel balls with a diameter of 5-15mm into the ball milling tank. The number of stainless steel balls for the four specifications is 15mm, 12mm, 8mm and 5mm, respectively. 4, 6, and 8, the total weight of the above-mentioned balls is 450 grams, and the weight of the α-quartz powder is 30 grams;

[0030] ① After sealing the ball milling tank, vacuumize it to control the vacuum degree in it to 0.05GPa; then,

[0031] ②Fill the ball mill tank with argon to make the pressure 0.2MPa; then,

[0032] ③ Re-evacuate the above-mentioned ball mill tank to control the vacuum degree in it to 0.05 GPa; then, fill the ball mill tank with argon to keep the internal argon pressure at 0.2 MPa; repeat...

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Abstract

The invention relates to a method for preparing coesite, comprising following energetic ball grinding method and static high-pressure method. The alpha-quartz flour forms alpha-quartz metastable phase of pyramidal system after 5-7 hours' ball grinding, grinding for 10 hours, and the metastable phase disappears. Testing said metastable phase quartz with Raman method combined with XRD, the space group is determined to be P41212(92), the crystal parameter are a=13.429 and c=7.999; the characteristic peak of Raman are: 470cm-1, 520cm-1, 800cm-1,1330cm-1 and 1600cm-1. The ball grinded sample is synthesized with static high-pressure method and produces coesite. The invention researches the phase-change course and non-crystallization mechanism of SiO2, discusses condition of conversion for alpha-quartz metastable phase to coesite, and provides a new method for coesite formation mechanism research.

Description

Technical field [0001] The invention relates to a method for preparing coesite, in particular to a method for preparing coesite by combining a high-energy mechanical ball milling method and a static high pressure method. Background technique [0002] The study of coesite appearing on the surface is considered a "window" for understanding the earth. For a long time, people have regarded the discovery of coesite on the surface as strong evidence for the theory of the exhumation of the earth's plates. Coes uses the static high pressure method to synthesize coesite. The synthesis conditions do not reflect the effects of local high pressure, local high temperature and shear force in the collision of the earth's plates, so it is difficult to meet the objective reality of surface coesite. Summary of the invention [0003] In order to solve the problems existing in the prior art, the present invention provides a method for preparing coesite by combining...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J3/06C30B29/18
Inventor 王巍然
Owner NORTHEAST DIANLI UNIVERSITY