I. Overview

This solution is designed for talc (Mohs hardness 1, excellent grindability) using a Raymond mill production line with a capacity of 10 tons per hour (10 TPH). Talc is naturally soft and readily grindable, making it one of the most suitable materials for Raymond mills.

The required fineness of talc powder varies by application: plastic fillers typically require about 400 mesh, coatings often demand 800 mesh or finer, and cosmetic grades need ≥800 mesh. This solution is designed for a general‑purpose fineness of 400 mesh (D97) , and the classifier speed can be adjusted to produce different mesh sizes as needed.

II. Basic Project Conditions

III. Equipment Selection and Main Parameters

3.1 Mill Selection

To achieve a 10 t/h output, the following options are available:

Recommendation: T145 Raymond mill with a capacity of 8‑15 t/h can comfortably meet the 10 tph requirement, leaving a margin for raw material variations.

Special note: Some sources indicate that for talc powder projects requiring >10 T/H, a vertical roller mill may offer better overall benefits. If budget permits and energy efficiency / environmental requirements are high, an LM‑series vertical roller mill (capacity 10‑40 T/H) could be considered. This solution is based on a traditional Raymond mill for reference and comparison.

3.2 Complete Equipment List

IV. Process Flow

4.1 Process Flow Chart

Talc ore → Jaw crusher (primary crushing) → Bucket elevator → Storage bin →
Electromagnetic vibrating feeder → Raymond mill (grinding) → Air‑borne powder →
Air classifier (classification) →
    ├─ Coarse powder → returned to grinding chamber for re‑grinding
    └─ Qualified fine powder → Cyclone collector → Finished powder discharge → Packing & storage
         ↓
    Pulse bag filter (cleaning exhaust before discharge)

4.2 Detailed Description of Each Step

(1) Crushing: Raw talc lumps (≤300 mm) are crushed by a jaw crusher to ≤30 mm to meet the mill feed requirement.

(2) Feeding: The crushed talc is lifted by a bucket elevator to the storage bin, and then fed uniformly, quantitatively and continuously into the grinding chamber via an electromagnetic vibrating feeder. Uniform feeding is critical to ensuring output and product quality.

(3) Grinding: The grinding rollers press tightly against the grinding ring under centrifugal force. The shovel blades pick up the material and feed it between the rollers and the ring, where the talc is pulverised by compression and shearing. Talc has a Mohs hardness of only 1, making it extremely easy to grind.

(4) Classification: The ground powder is carried upward by the air stream from the blower and enters the air classifier. Qualified fine powder (400 mesh) passes through the classifier to the cyclone collector; unqualified coarse powder is returned to the grinding chamber for re‑grinding. By adjusting the classifier speed, the finished fineness can be freely controlled within the range of 80‑400 mesh.

(5) Collection: The qualified fine powder is collected by the cyclone separator and discharged from the outlet. The exhaust gas is purified by a pulse bag filter before being released into the atmosphere, achieving environmentally compliant production.

V. Applications of Talc Powder

Talc powder possesses good electrical insulation, heat resistance, chemical stability, lubricity, oil absorption, hiding power and machinability. Different fineness grades are used in different fields.

5.1 Applications by Sector

5.2 Specific Roles of Talc Powder in Various Industries

(1) Plastics Industry (primary target market for this solution)

Talc is an important functional filler for plastics, featuring a unique lamellar (plate‑like) structure. Adding talc to plastics can:

• Significantly improve the rigidity, hardness and heat resistance of products
• Enhance dimensional stability and creep resistance
• Increase impact strength and tensile strength
• Improve electrical insulation and chemical stability
• Reduce material cost and coefficient of thermal expansion

It is especially widely used in polypropylene (PP) modification systems and is an important filler for automotive components. It can also be used as a reinforcing filler in PVC.

(2) Coatings Industry

Talc powder disperses well in both polar and non‑polar matrices, has chemical inertness and high oil absorption. Ultra‑fine modified talc can significantly improve the corrosion resistance of coatings, and can partially replace more expensive matting agents to reduce formulation costs.

(3) Paper Industry

Talc improves paper gloss, ink receptivity, opacity and printability.

(4) Ceramics and Refractories

As a ceramic ingredient, it effectively controls the thermal expansion of the body; as a glaze ingredient, it provides an inexpensive source of magnesium oxide.

VI. Quality Control and Environmental Protection

6.1 Quality Control Points

6.2 Environmental Measures

• The entire system operates under negative pressure; no dust leakage
• Equipped with pulse bag filter for exhaust gas cleaning before discharge
• Air‑recycling classification system returns coarse particles to the mill for re‑grinding
• Workshop dust concentration controlled within national emission limits

VII. Investment and Economic Estimates (Reference)

VIII. Conclusions and Recommendations

1. Mill selection: For 10 tonnes/hour talc powder, the T145 Raymond mill (8‑15 t/h) is recommended. If budget permits, a vertical roller mill may be considered for better overall efficiency.
2. Target product: 400‑mesh talc powder is mainly aimed at the plastics filler market (PP, PVC, nylon and other modified plastics), which has large demand and mature applications.
3. Recommendations:
   • Conduct small‑scale trial grinding before full production to verify mill selection and fineness control.
   • Determine the final fineness according to the target market; if producing coating‑grade (≥800 mesh), a more efficient classification system may be required.
   • Take care to preserve the lamellar structure of talc – excessive grinding may damage the flaky morphology and reduce reinforcing effectiveness.