1. Working Conditions
Ferruginous Shale is rich in iron oxides, red-brown to purple-red, hardness ranging widely from 20-40MPa, some dense layers exceeding 45MPa. Iron content typically 5%-15%, reaching 25%+ in enriched zones with good comprehensive utilization value.
For ferruginous shale with variable hardness, select equipment based on actual hardness. Mono-arm ripper (C Series) for 20-30MPa; Separate-arm ripper (J Series) for ≥30MPa to maximize mining efficiency.
 
2. Recommended Equipment
Arm Type
Model
Excavator Tonnage
Hardness Range
Core Advantages
Integrated (C Series)
CSJ400C
40-65t
20-28MPa
Compact structure, large working radius
Integrated (C Series)
CSJ700C
65-85t
22-30MPa
High output, high efficiency
Integrated (C Series)
CSJ900C
85-95t
25-32MPa
Strong penetration, wear-resistant design
Separate (J Series)
CSJ400J
40-65t
30-35MPa
Concentrated breaking force, narrow faces
Separate (J Series)
CSJ700J
65-85t
32-38MPa
High output, hard rock preferred
Separate (J Series)
CSJ900J
85-95t
35-42MPa
Strong penetration, heavy hard rock
Separate (J Series)
CSJ1200J
120t
38-50MPa
Extra-large breaking force, highest output
 
 
3. Production Rate
Rock Hardness
CSJ400C/J (40-65t)
CSJ700C/J (65-85t)
CSJ900C/J (85-95t)
CSJ1200C/J (120t)
20-28MPa (C Series)
160-200m³/h
180-220m³/h
220-260m³/h
260-300m³/h
25-32MPa (C Series)
130-170m³/h
160-200m³/h
200-240m³/h
240-280m³/h
30-35MPa (J Series)
100-160m³/h
140-180m³/h
160-220m³/h
200-260m³/h
35-42MPa (J Series)
—
—
130-180m³/h
160-220m³/h
38-50MPa (J Series)
—
—
100-150m³/h
140-200m³/h
 
Reference data from ripper field tests. Ferruginous shale hardness distribution is uneven; conduct multi-point sampling before construction.
 
4. Construction Process
· Geological Survey: Iron content varies; conduct multi-point sampling at different zones, test hardness and iron content of each layer
· Equipment Selection: Choose C Series for <30MPa; J Series for ≥30MPa based on test results
· Equipment Mobilization: Position the ripper, inspect hydraulic system, pins, and safety devices
· Layered Stripping: Strip from top to bottom along bedding, control layer thickness 300-500mm, avoid large block collapse
· Breaking & Screening: Screen through vibrating screen, control product size ≤350mm; high-iron fragments can be stacked separately for reuse
· Slope Trimming: Use the ripper for slope trimming to ensure stable and regular mining face
 
5. Efficiency Comparison
Item
Traditional Blasting

Daily Output (8h shift)
700-1400m³

Comprehensive Cost
Explosives + detonators + permits + safety + labor

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

Impact on Rock Layer
Damages bedding, over-crushing, iron loss

Environmental Compliance
Requires approval, heavy dust and noise pollution

 
 
6. Construction Precautions
· Hardness Zoning is Essential: Conduct multi-point sampling before construction to avoid incorrect model selection
· Equipment Boundary: 30MPa is the division point — C Series below, J Series at or above 30MPa
· Iron Dust Protection: Iron-bearing dust is generated during breaking; equip workers with dust masks and dust suppression systems
· Equipment Corrosion: High iron content is corrosive; shorten hydraulic oil change interval (every 180h), regularly check pin wear
· Iron Reuse: High-iron fragments can be separately stacked and processed through magnetic separation for low-grade iron ore sale, reducing mining costs