1. Working Conditions
Black Shale is a fine-grained sedimentary rock rich in organic matter, gray-black to black, hardness 15-35MPa, obvious bedding, rich in sulfide and carbonaceous components.
Traditional blasting produces harmful gases (H2S), and blasted fragments have uneven particle size, affecting downstream processing efficiency.
Non-blasting mechanized mining with Mono-arm ripper (C Series) is the preferred green and efficient solution for black shale mines.
 
2. Recommended Equipment
Model
Excavator Tonnage
Application
Core Advantages
CSJ400C
40-65t
Surface stripping & soft rock breaking
Compact, large radius, narrow working faces
CSJ700C
65-85t
Medium-hardness black shale large-scale mining
High output, best cost-performance ratio
CSJ900C
85-95t
High-hardness black shale, fractured layers
Strong penetration, wear-resistant
CSJ1200C
120t
Super large mine face, high-intensity operations
Extra-large radius, highest single-shift output
 
 
3. Production Rate
Hardness
CSJ400C (40-65t)
CSJ700C (65-85t)
CSJ900C (85-95t)
CSJ1200C (120t)
18-25MPa
170-210m³/h
190-230m³/h
230-270m³/h
270-310m³/h
22-28MPa
150-190m³/h
170-210m³/h
210-250m³/h
250-290m³/h
25-32MPa
90-160m³/h
140-190m³/h
170-220m³/h
210-270m³/h
28-38MPa
—
—
140-180m³/h
170-230m³/h
 
Reference data from Mono-arm ripper field tests. Black shale hardness generally 18-28MPa; refer to the first two rows as priority.
 
4. Construction Process
· Geological Survey: Confirm layer thickness, hardness distribution, sulfur content, and joint orientation for model selection
· Ventilation Setup: Black shale may release trace H2S; arrange ventilation and ensure air circulation on working face
· Equipment Mobilization: Position the Mono-arm ripper, inspect hydraulic system, pins, and safety devices
· Layered Stripping: Strip from top to bottom along bedding direction, control layer thickness 300-500mm, avoid large block collapse
· Breaking & Screening: After breaking, screen through vibrating screen, control product size ≤350mm for downstream processing
· Slope Trimming: Use Mono-arm ripper for slope trimming to ensure a stable and regular mining face
 
5. Efficiency Comparison
Item
Traditional Blasting

Daily Output (8h shift)
800-1500m³

Comprehensive Cost
Explosives + detonators + permits + safety + labor

Safety Risk
High (flying rocks, toxic gases, long approval cycle)

Impact on Rock Layer
Damages bedding, causes over-crushing, increases screening cost

Environmental Compliance
Requires environmental approval, heavy dust and noise pollution

 
 
6. Construction Precautions
· Ventilation Guarantee: H2S may be released during mining; maintain good ventilation and use portable gas detectors
· Dust Control: Black shale dust is fine and easily suspended; configure mist cannons or water trucks for dust suppression
· Product Size Control: Adjust based on downstream requirements, generally 200-350mm to avoid resource waste from over-crushing
· Equipment Maintenance: High sulfur content is corrosive to metals; shorten hydraulic oil change interval (every 200h recommended)
Model Selection: CSJ400C for <22MPa; CSJ700C for 22-28MPa; CSJ900C or above for >28MPa