FAQ
What Equipment Is Used to Grind Talc Powder for Coating Industry?
2026-05-06 13:49:33
Summary:
For coating-grade talc powder, the common choice is an MTW Raymond mill for 80-325 mesh, while LUM or MW ultrafine mills are used for 400-1250 mesh because talc is soft, flaky, and sensitive to moisture.
Details:
What Mill Is Normally Used for Coating-Grade Talc?
For coating industry talc, mill selection depends mainly on fineness. If the product is in the 80 to 325 mesh range, a Raymond-type roller mill such as Liming Heavy Industry MTW European Type Grinding Mill is usually the practical choice. It gives stable output, simple circuit layout, and good control of standard mineral powder grades.
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If the coating plant needs finer talc, typically 400 to 1250 mesh, then Liming Heavy Industry LUM Ultrafine Vertical Mill or MW Micro Powder Mill is more suitable. These mills are designed for finer classification and tighter particle size control, which matters when the specification is based on D97 or narrow top size.
Why Does Talc Need a Specific Grinding Method?
Talc is very soft, usually around Mohs hardness 1, but its plate-like structure changes the grinding behavior. It breaks easily under compression and shear, so roller-based mills are preferred. Excessive impact can create too many ultrafine particles and make particle size distribution harder to hold within coating specifications.
Moisture is another operating limit. Talc feed is normally dried and controlled below about 1 percent moisture, especially for fine grinding. Wet feed tends to coat the rollers, ring, and classifier parts, which reduces capacity and makes the final D97 less stable.
What Production Conditions Should Be Checked?
Typical talc hardness: Mohs 1
Recommended feed size after crushing: below 20 to 25 mm
Preferred feed moisture: below 1 percent for stable fine grinding
MTW European Type Grinding Mill: usually for 80 to 325 mesh
LUM Ultrafine Vertical Mill: commonly used for 400 to 1250 mesh with tighter D97 control
MW Micro Powder Mill: suitable for very fine talc where narrow top size is required
Typical power demand depends on fineness, often lower for standard MTW duty and higher for ultrafine circuits
In field operation, the rule is simple. For standard coating filler grades, use MTW. For finer, higher-value powder with stricter size distribution, use LUM or MW. The wrong selection usually shows up as low capacity, unstable classifier cut point, or excess fines.
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FAQ
Can Raymond mill grind talc for coating use?
Yes. For coating-grade talc in the 80 to 325 mesh range, MTW European Type Grinding Mill is a common option.
Why is ultrafine equipment used for talc?
Because many coating applications require 400 mesh and finer powder with tighter D97 control, which is better handled by LUM Ultrafine Vertical Mill or MW Micro Powder Mill.
What moisture level is suitable for talc grinding?
For stable production, talc feed is preferably kept below about 1 percent moisture.
What is the usual feed size before talc enters the mill?
After crushing, feed is commonly controlled below 20 to 25 mm.
