Comminution and Particle Refinement
Roller-Mill / Jaw-Crusher with Lunar-Dust Containment
A lunar comminution unit integrates a jaw crusher and roller mill to reduce coarse regolith aggregates and rock cores up to 100 millimeters to a 1-millimeter product size for downstream beneficiation. Operating in the lunar environment requires substantial mechanical adaptation: one-sixth gravity alters crusher throat residence time, necessitating a hardened steel auger feed, while vacuum conditions permit rapid dust dispersion that mandates sealed housings and bellows. Severe abrasive wear from silicates limits tungsten carbide wear plates to a 1,000-hour replacement interval, and electrostatic adhesion from fractured particles necessitates internal sweep mechanisms within the 60-kilogram, 300-watt assembly.
Crushing and grinding equipment that reduces large regolith aggregates and bedrock fragments (from L3-ISR-EXC-DRL or rare rock cores) to particle sizes suitable for downstream sieving and beneficiation — typically a jaw crusher followed by a roller mill.
Purpose
Free target minerals from larger composite-particle aggregates so they can be separated by electrostatic and magnetic methods; reduce coarse rock fragments to processable size; provide a consistent feedstock to downstream stages.
Context
Optional stage upstream of L3-ISR-BEN-SIZE for processing coarse material from drilling or rock-bearing regolith. Most lunar regolith is already fine, so comminution is used selectively rather than on bulk feed.
Principles
- ▸Comminution reduces particle size through impact (jaw crusher), compression (roller mill), or attrition (ball mill)
- ▸Bond Work Index quantifies energy required to crush material by 1 size class (typical 10-30 kWh/tonne for silicate rock)
- ▸Multi-stage size reduction more energy-efficient than single-stage (jaw → roller → ball)
- ▸Dust containment essential — vacuum environment makes fine-particle escape easy
- ▸Wear on crushing surfaces from abrasive materials — replaceable jaw plates and roller surfaces
- ▸Operating in 1/6 g reduces gravity-assist on crusher feed; agitator or auger feed required
Typical implementations
- ▸Industrial mining jaw crushers and roller mills (terrestrial heritage, must be re-engineered for vacuum/dust)
- ▸NASA KSC granular mechanics test fixtures
- ▸Lunar regolith simulant comminution at production facilities (CSM, Open University)
- ▸Asteroid mining concepts (Planetary Resources, Deep Space Industries) — comminution heritage
Lunar considerations
- ▸Vacuum environment makes dust containment critical — sealed crusher housing with vacuum-tight feed/discharge
- ▸Abrasive wear is severe — tungsten-carbide wear surfaces or replaceable hardened-steel plates
- ▸1/6 g reduces crusher throat residence time — adjusted closing angle or feed augment
- ▸Static electricity in finely-comminuted regolith causes adhesion to housing walls — internal sweep mechanism
- ▸Long-life crusher bearings sealed against dust (PFPE or MoS2 lubrication)
- ▸Energy cost may make comminution viable only for high-value mineral concentration
Specifications
Functional
| primary function | Reduce coarse rock and aggregate to sub-mm particle size |
| inputs | Coarse material from L3-ISR-EXC-DRL or rock-bearing regolith, Power from L1-PDM (motor + auger feed) |
| outputs | Crushed regolith to L3-ISR-BEN-SIZE for sieving, Comminution telemetry (throughput, power, wear) |
| feed size max mm | 100 |
| product size p80 mm | 1 |
| throughput kg per hour | 20 |
| specific energy kwh per tonne | 15 |
| power consumption w | 300 |
| wear surface replacement interval hours | 1000 |
Physical
| mass kg | 60 |
| dimensions | 1.0 × 0.6 × 1.0 m |
| materials | Tungsten carbide wear surfaces (jaw plates, rollers), 316L stainless housing, Sealed BLDC motor with harmonic-drive reducer, Dust-tight bellows seals at feed/discharge, Hardened steel auger feed, Sintered metal dust filters at vent |
| operating temperature c | -40, 100 |
| vacuum compatibility | True |
| ultimate load g | 6 |
Operational
| power consumption w | 300 |
| thermal range c | -40, 100 |
| lifetime years | 15 |
| mtbf hours | 8000 |
| wear surface replacement per year | 8 |
Interfaces
Provides
- Comminuted regolith ready for sieving
- Comminution telemetry
Requires
- Coarse drill cuttings or rock fragments
- Motor + auger (~300 W)
Cite this entry
Lunar Ark Codex. "Comminution and Particle Refinement" (L3-ISR-BEN-COMM). Retrieved 10 September 2026, from https://lunarark.com/entry/L3-ISR-BEN-COMM
Licensed CC-BY-SA 4.0. You may reuse and adapt this entry with attribution, under the same licence.