Development of a Double Vacuum Furnace Tube and Its Application in Gas Composition Determination during Rock Heating Degassing

Zi-han GAO; Li-wu LI; Yu-hui WANG; Chun-hui CAO; Jian HE

doi:10.15898/j.cnki.11-2131/td.201812190138

2019 Vol. 38, No. 5

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Article navigation > Rock and Mineral Analysis > 2019 > 38(5): 469-478

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Zi-han GAO, Li-wu LI, Yu-hui WANG, Chun-hui CAO, Jian HE. Development of a Double Vacuum Furnace Tube and Its Application in Gas Composition Determination during Rock Heating Degassing[J]. Rock and Mineral Analysis, 2019, 38(5): 469-478. doi: 10.15898/j.cnki.11-2131/td.201812190138

Citation:

Zi-han GAO, Li-wu LI, Yu-hui WANG, Chun-hui CAO, Jian HE. Development of a Double Vacuum Furnace Tube and Its Application in Gas Composition Determination during Rock Heating Degassing[J]. Rock and Mineral Analysis, 2019, 38(5): 469-478. doi: 10.15898/j.cnki.11-2131/td.201812190138

Development of a Double Vacuum Furnace Tube and Its Application in Gas Composition Determination during Rock Heating Degassing

1.
Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
2.
Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Chinese Academy of Sciences, Lanzhou 730000, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

More Information

Corresponding author: Li-wu LI, llwu@lzb.ac.cn

Received Date: 19 December 2018

Revised Date: 14 May 2019

Accepted Date: 16 July 2019

Abstract

Abstract

BACKGROUNDThe analysis of gas chemical composition in rock and mineral can provide important information and constraints for the study of different geochemical processes of lithospheric mantle, redox environment in the earth, and water circulation in the deep earth. Heating rock and ore samples to remove gas is a common experimental method. A single quartz glass tube is used as the sample tube. Irregular voids in quartz glass structure make gas easy to diffuse and permeate at high temperature. The double vacuum furnace tubes consisting of molybdenum and tantalum crucibles are generally used for the analysis of rare gas isotope composition, but seldom used for the analysis of gas chemical composition. The device has a complex structure, is not easy to assemble and disassemble, and is easily damaged. OBJECTIVESTo solve the problems contained in the sample-filling tube proposed in the background research. METHODSA double vacuum sampling furnace tube composed of quartz glass and metal parts had been developed. The furnace tube had the characteristics of small size, easy assembly, disassembly and movement. Under the same experimental conditions, the result was compared with that of a single quartz glass tube. RESULTSH₂ concentration measured by the double vacuum sampling tube was higher than that measured by the single quartz glass tube under the same experimental conditions, no matter which type of sample was heated to degas at 500℃ or 950℃. CONCLUSIONSThe closure of the double vacuum furnace tube is better than that of the single quartz glass tube, which is conducive to obtain more real gas chemical composition in the sample.
- double vacuum furnace tube /
- single quartz glass tube /
- gas chromatography /
- gas-released from rock

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References

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