1. Working Conditions
Oil Shale is a high-ash combustible sedimentary rock, hardness <20MPa, medium-soft rock with obvious layered structure, well-developed joints, easily fractured.
Traditional blasting is costly and high risk, damaging the layered structure, affecting refining quality.
Mono-arm ripper (C Series) non-blasting mining is the mainstream construction method for oil shale mines.
 
2. Recommended Equipment
Model
Excavator Tonnage
Application
Core Advantages
CSJ400C
40-65t
Surface stripping & breaking
Compact, large working radius
CSJ700C
65-85t
Medium-to-large mine face
High output, optimal for large-scale
CSJ900C
85-95t
Hard rock, fractured layers
Strong penetration, wear-resistant
CSJ1200C
120t
Super large mine face
Extra-large radius, highest output
 
 
3. Production Rate
Hardness
CSJ400C (40-65t)
CSJ700C (65-85t)
CSJ900C (85-95t)
CSJ1200C (120t)
15-25MPa
180-220m³/h
200-240m³/h
240-280m³/h
280-320m³/h
20-28MPa
160-200m³/h
180-220m³/h
220-260m³/h
260-300m³/h
25-32MPa
100-180m³/h
150-200m³/h
180-240m³/h
220-280m³/h
28-35MPa
—
—
150-200m³/h
180-250m³/h
 
Reference data from Mono-arm ripper field tests. Actual output varies with conditions, operator skill, and equipment configuration.
 
4. Construction Process
· Site Survey: Confirm layer thickness, hardness distribution, and water content to select the appropriate model
· Equipment Mobilization: Position the Mono-arm ripper, inspect hydraulic system, connection pins, and attachment
· Surface Stripping: Loosen the surface overburden and expose the oil shale layer
· Breaking & Mining: Break along the bedding direction, control product size to ≤300mm to avoid excessive crushing
· Loading & Hauling: Load broken oil shale onto trucks for transport to storage or refining plant
· Slope Trimming: Use the Mono-arm ripper for slope trimming to ensure a stable and safe mining face
 
5. Efficiency Comparison
Item
Traditional Blasting

Daily Output (8h shift)
800-1600m³

Comprehensive Cost
Blasting permits + explosives + labor + safety inspection

Safety Risk
Medium (flying rocks, vibration, long approval cycle)

Impact on Rock Layer
Easily damages bedding structure, affecting refining quality

Environmental Compliance
Requires environmental approval, strict dust/noise controls

 
 
6. Construction Precautions
· Water-Bearing Layer Management: Oil shale softens on contact with water; ensure drainage in rainy season
· Product Size Control: Oversized product affects refining efficiency; configure screening equipment, control size ≤300mm
· Equipment Maintenance: Oil shale dust is heavy; clean radiator daily, replace air filters and hydraulic oil filters regularly
· Slope Angle Control: Mining slope should be ≤45° to prevent collapse and ensure operational safety
· Model Selection: CSJ400C suffices for hardness <20MPa; choose CSJ700C or above when approaching 25MPa