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Volume 44 Issue 4
Sep.  2024
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Article Navigation >  Diamond & Abrasives Engineering  > 2024  >  44(4): 433-439
LIU Li, SHAO Fangyuan, LUO Yucai, WU Qiang, YU Jiantao, YU Jinping, WANG Haikuo, HOU Zhiqiang, WANG Chao, YANG Yikan. Pressure-transmitting properties of pyrophyllites from different localities[J]. Diamond & Abrasives Engineering, 2024, 44(4): 433-439. doi: 10.13394/j.cnki.jgszz.2023.0152
Citation: LIU Li, SHAO Fangyuan, LUO Yucai, WU Qiang, YU Jiantao, YU Jinping, WANG Haikuo, HOU Zhiqiang, WANG Chao, YANG Yikan. Pressure-transmitting properties of pyrophyllites from different localities[J]. Diamond & Abrasives Engineering, 2024, 44(4): 433-439. doi: 10.13394/j.cnki.jgszz.2023.0152
shu

Pressure-transmitting properties of pyrophyllites from different localities

doi: 10.13394/j.cnki.jgszz.2023.0152
  • 1.

    CNPC Engineering Technology R & D Company Limited, Beijing 102206, China

  • 2.

    PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China

  • 3.

    College of Energy Engineering, Zhejiang University, Hangzhou 310027, China

More Information
  • Received Date: 2023-07-29
  • Accepted Date: 2023-11-20
  • Rev Recd Date: 2023-10-30
    • Available Online: 2024-09-25
    Abstract
  •   Objectives  Pyrophyllite, as a sealed pressure medium, has been widely used in high-pressure research for laboratories and industrial synthesis. A highly efficient pressure transfer medium can generate higher cell pressure at the same loading force. The use of a highly efficient pressure transfer medium reduces the risk of anvil rupture and production costs. Therefore, it is important to develop a suitable and efficient pressure-transmitting pyrophyllite.  Methods  The pressure calibration of four pyrophyllites from different localities at room temperature was conducted in a 6 × 8 MN multi-anvil large-volume press. The relationship between loading force and cell pressure at room temperature was established. The influence of mineral composition changes in pyrophyllite on pressure-transmitting efficiency was studied using X-ray diffraction.  Results  By investigating the influence of mineral composition changes in pyrophyllite on pressure-transmitting efficiency, the results are as follows: (1) When achieving the same cell pressure, the required loading force for Pyrophyllite 4 is 10% lower than those for the other three pyrophyllites, indicating that Pyrophyllite 4 has the best pressure-transmitting efficiency. (2) As cell pressure increases, the relationship between cell pressure and loading force begins to deviate from linearity, and the pressure-transmitting efficiency of pyrophyllite gradually decreases. When the cell pressure exceeds 5.00 GPa, applying higher loading force does not significantly increase the cell pressure. (3) Higher hardness minerals (such as Diaspore, Boehmite) in pyrophyllite can effectively improve pressure-transmitting efficiency in the low-pressure stage (cell pressure 2.55-3.68 GPa). When the minerals in pyrophyllite undergo phase transformation to form new minerals with higher hardness (such as Muscovite and Kaolinite) in the high-pressure stage (cell pressure of 5.50 GPa), pressure-transmitting efficiency can be effectively improved.  Conclusions  Pyrophyllite 4 has better pressure-transmitting efficiency than Pyrophyllite 2 does in the high-pressure stage, but it is prone to failure in sealing due to the changes in mineral composition. However, Pyrophyllite 2 shows good elastic recovery effect and sealing performance and can stably complete compression and decompression work. Considering both pressure-transmitting efficiency and sealing effect, Pyrophyllite 2 has better application value and economic benefits.

     

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