An ultra-fine grinding mill (ring-roller micro powder mill) is a high-efficiency grinding machine that produces super-fine powder from minerals such as calcium carbonate, barite, talc, gypsum, kaolin and graphite. It is an upgraded version of the Raymond mill with a modernized structure — the grinding rollers press material against the grinding ring, while an air classifier continuously separates finished powder, giving up to 15% more capacity and over 50% lower wear-part cost than a conventional Raymond mill.

It handles more than 100 kinds of non-flammable, non-explosive minerals: calcite, limestone, dolomite, kaolin, bentonite, talc, mica, barite, gypsum, graphite, carbon black, wollastonite, illite, sepiolite and more. Materials must have a Mohs hardness of ≤7 (some models ≤8) and feed moisture of ≤6%.

Finished fineness is continuously adjustable from 150 to 3000 mesh (about 74 to 5 μm), with D97 precision classification. It can consistently produce powders below 10 μm — much finer than a ball mill (which is efficient only down to about 0.074 mm / 200 mesh) or a standard Raymond mill (practical ceiling around 425–600 mesh).

Output depends on the model. For the CRGM series: CRGM 80 ≈ 0.5–5.5 t/h, CRGM 90 ≈ 0.8–6.5 t/h, CRGM 100 ≈ 1.2–10 t/h, CRGM 125 ≈ 2.5–20 t/h, CRGM 1680 ≈ 5–45 t/h. At the same fineness and installed power, capacity is roughly double that of a ball mill, jet mill or stirred mill.

Max feed size is typically ≤20–40 mm (pre-crushing with a jaw/hammer crusher is recommended for larger rock). Installation needs a stable concrete foundation, adequate height clearance for the classifier and cyclone system, and a dust-collection connection. Footprint ranges from about 14–32 m in length depending on model.

Fineness is controlled by the speed of the air classifier and the air volume: higher classifier speed = finer powder. The operator adjusts it on the control panel (variable-frequency drive) without stopping the mill, letting one machine cover 150–3000 mesh for different customer specs.

A Raymond mill is best for medium grinding (about 80–425 mesh) and is economical for coarse powder. An ultra-fine mill is built specifically for fine to super-fine grinding (325–3000 mesh): it has a higher-efficiency multi-blade classifier, tighter grinding gap, and higher output per kWh at fine sizes. For 2500-mesh calcium carbonate or similar, the ultra-fine mill is the correct choice.

A ball mill has lower initial investment but high energy consumption (roughly 15–30 kWh/t even at coarse sizes, and far higher when chasing fine powder), plus it’s inefficient below 200 mesh. An ultra-fine mill uses bed-compression rolling (less friction loss), needs less floor space, produces much finer powder, and is typically 30–50% more energy-efficient for fine grinding — so it’s favored by powder plants producing 600–3000 mesh products.

For ultra-fine targets, specific energy is generally in the range of roughly 50–80 kWh/t depending on material hardness and fineness — higher than coarse grinding, but far lower than a ball mill or jet mill chasing the same fineness. Wear parts are mainly the grinding roller and grinding ring; HGM’s design gives a typical service life of several thousand hours, and replacing them is quick and low-cost because of the bolted modular design.

Supply includes complete machine + classifier + cyclone + dust collector + blower + control cabinet. We provide: pre-sale material test grinding to confirm fineness and capacity, site layout drawing, foundation drawing, engineer-guided installation and commissioning, operator training, and a spare-parts package (grinding rollers, rings, and classifier blades). Warranty and 24/7 technical support by WhatsApp/email are included.