How to Achieve 1000 Mesh Graphite Fineness for Advanced Applications

1000 mesh graphite equals approx 13 μm particle size, widely used in lithium battery anode materials, high-conductive slurry, thermal interface materials, high-end anti-corrosion coatings and aerospace composite materials. To stably produce qualified 1000 mesh fine graphite, adopt low-temperature ultrafine grinding + high-precision airflow classification process, strictly control particle size distribution, retain complete graphite flake structure, minimize iron contamination and low ash content.

1. High-Grade Raw Material Standard

• Raw material: High crystalline natural flake graphite / high purity artificial graphite
• Fixed carbon content: ≥98%
• Ash content: ≤1.0%
• Iron content: ≤80 ppm
• Raw material moisture: ≤0.5%
• Remove gangue, silt and hard abrasive impurities completely in advance

2. Complete Production Process

Step 1 Pre-treatment & Purification

1. Sort out large impurities manually
2. Water washing to remove surface mud and fine soil
3. Low temperature drying at 60–75°C, final moisture controlled below 0.4%
4. Primary coarse crushing to 3–8 mm uniform particles

Step 2 Core Ultrafine Grinding (Key Process)

Select dedicated ultrafine grinding equipment, ordinary Raymond mill cannot reach stable 1000 mesh:

1. Airflow Jet Mill (Best for high-end advanced grade)No mechanical contact grinding, ultra-low iron pollution, complete flake retention, ideal for battery and electronic grade graphite
2. Vertical Ultrafine Grinding Mill (Mass production preferred)Large output, stable fineness, suitable for industrial large-scale 1000 mesh graphite
3. Ring Roller Ultrafine MillCost-effective, stable fineness for general advanced coating grade

Grinding core rule: Keep grinding temperature below 65°C to avoid graphite oxidation and crystal structure damage.

Step 3 High-Precision Air Classification (Decisive for 1000 Mesh)

1. Match high-speed dynamic classifier, adjust rotor speed to fix cutting particle size at 13 μm
2. All particles larger than 13 μm return to grinding chamber for re-grinding
3. Control finished product index: 1000 mesh passing rate ≥98%, D97 ≤15 μm
4. Stabilize air volume and wind pressure to avoid fineness fluctuation

Step 4 Multi-stage Iron Removal & Deep Purification

1. Install high-strength magnetic separator (12000–15000 Gauss) to remove mechanical iron impurities
2. For battery-grade advanced graphite: add acid washing process to reduce ash and harmful metal elements
3. Remove micro abrasive impurities to ensure high stability in high-end formulas

Step 5 De-agglomeration & Dispersion Treatment

Add trace non-toxic grinding dispersant during production to eliminate powder agglomeration, greatly improve dispersion performance in resin, solvent and slurry system.

Step 6 Homogenization & Finished Collection

1. Uniform mixing of finished fine graphite powder
2. Pulse dust collection full recovery, no waste loss
3. Sealed moisture-proof packaging

3. Core Technical Control Points

1. Do not pursue excessive fineness blindly, protect graphite flake integrity to maintain excellent conductivity and thermal conductivity
2. Keep feeding speed stable, avoid sudden fast feeding causing coarse powder overflow
3. Regularly check and replace classifier blades to ensure consistent classification effect
4. Strictly isolate external moisture, prevent fine graphite powder from absorbing moisture and caking
5. Adjust classifier speed slightly according to raw material hardness to lock 1000 mesh stably

4. Quality Index for Advanced 1000 Mesh Graphite

• Fineness: 1000 mesh pass rate ≥98%
• Median particle size D50: 11–13 μm
• Moisture: ≤0.4%
• Ash content: ≤1.0%
• Iron content: ≤80 ppm
• Good fluidity, no hard agglomeration
• Excellent dispersion in oil phase and water phase systems

5. Common Production Troubleshooting

1. Fineness not fine enough

Reason: Low classifier speed, insufficient grinding time

• Solution: Increase classification rotor speed, reduce unit feeding volume
• Serious powder agglomeration

Reason: High moisture, excessive fine powder

• Solution: Strengthen drying, optimize airflow balance
• High iron impurity content

Reason: Grinding liner and roller wear seriously

• Solution: Replace wear-resistant ceramic accessories, enhance multi-stage iron removal
• Unstable batch fineness

Reason: Unstable raw material hardness and uneven feeding

1. Solution: Pre-blend raw materials, adopt automatic constant feeding system

6. Matching Advanced Application Directions

1. Lithium ion battery anode auxiliary material
2. High thermal conductivity silicone grease & thermal conductive filler
3. Electronic conductive silver paste / carbon conductive slurry
4. High temperature resistant high-grade industrial coatings
5. Carbon fiber composite reinforcing filler
6. EMI electromagnetic shielding materials