Table 1 Principal technical parameters of DM equipment.

Slurry channel

1

1

2

Compressed air channel

None

None

1

Blade number of one shaft

2–8

2–6

14

rotation speed of shaft(r/min)

30–70

15–35

20–40

Penetration/withdraw rate (m/min)

0.5–1.5

0.2–2.4

0.5–1.5

References

^25,26

^27,28

^29,30