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Gold Science and Technology >

2020 , Vol. 28 >Issue 4: 521 - 530

DOI: https://doi.org/10.11872/j.issn.1005-2518.2020.04.016

Mining Technology and Mine Management

Experimental Study on Mechanical Impact Breaking Rock with Microwave Radiation

  • Biwei HU ,
  • Tubing YIN ,
  • Xibing LI
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  • School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China

Received date: 2019-12-24

  Revised date: 2020-03-25

  Online published: 2020-08-27

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Highlights

In industrial production，dynamic load rock breaking equipment is widely used in metal and non-metal mines，such as drill，downhole drill and cable drill.Mechanical rock breaking is often faced with such problems as low crushing efficiency，poor crushing effect and expensive equipment.Therefore，it is necessary to find an efficient，simple and safe method to break the rock.Microwave-assisted percussive rock breaking is an important means to break hard rock quickly.It is of great theoretical and practical significance to study the impact resistance of rock by microwave radiation.In this paper，an industrial microwave oven was used to test the radiation of sandstone with different power and time.The wave velocity of sandstone before and after radiation were measured and the porosity of rock before and after radiation were measured by nuclear magnetic resonance equipment.Then，the dynamic compressive mechanical strength of rock was tested by SHPB method，and the rock failure process and characteristics were recorded by high-speed camera.The results show that under the microwave radiation，the sandstone heating speed is very fast.Under the radiation power of 5 kW，the sandstone heating rate reaches 1.29 ℃/s，and under the condition of 3 kW，it reaches 1.04 ℃/s.After the microwave radiation，the wave velocity of sandstone decrease continuously and the porosity increase continuously.After 5 kW radiation for 4 min，the wave velocity decreases by 34% and the porosity increases by nearly 70%.The dynamic compressive strength of sandstone is also continuously reduced，and after 5 kW and 3 kW radiation for 4 min，it decreases by 60.4 MPa and 44 MPa respectively.Under the action of impact stress，rock shows radial failure modes and axial failure modes.The results show that microwave radiation can rapidly heat up sandstone.Because of the thermal stress，cracks are generated inside the sample then spread，which makes the wave velocity decrease and the porosity increase and the dynamic compressive strength decrease drastically.

Cite this article

Biwei HU , Tubing YIN , Xibing LI . Experimental Study on Mechanical Impact Breaking Rock with Microwave Radiation[J]. Gold Science and Technology, 2020 , 28(4) : 521 -530 . DOI: 10.11872/j.issn.1005-2518.2020.04.016

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http://www.goldsci.ac.cn/article/2020/1005-2518/1005-2518-2020-28-4-521.shtml

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