Centrifugal Blowers for Mining and Mineral Processing

Mining and mineral processing plants need air for far more than dust control. Ore dryers, mineral separation, pneumatic conveying of concentrates, and cooling for crushers and mills all use centrifugal blowers, alongside dust collection at transfer points and screening plants. Add remote sites, abrasive materials, and sometimes underground work, and blower selection here has to be practical as well as technically correct. This page covers the range of duties and where our machines fit.

Where Blowers Fit

Duty	Typical pressure	Notes
Mineral drying	High	Rotary and fluid-bed dryers for concentrate, coal, and aggregates
Concentrate and powder conveying	High to the start of very high	Pneumatic conveying over modest distances
Crusher and screening dust collection	High	Clean-side, at transfer points
Motor and gearbox cooling	Low to medium	Mill drives, crusher motors
Plant and control room ventilation	Low to medium	General ventilation, filtered supply
Underground auxiliary extraction	Low to medium	Non-gassy workings only, within our pressure range
Primary crusher dedusting at very large scale	Very high flow	Sometimes outside our range

Worked Example: Mineral Dryer

A rotary dryer processes mineral concentrate, evaporating 1,200 kg/h of water at 120 °C, with the air picking up 0.04 kg of moisture per kg of dry air.

• Air mass flow: 1,200 ÷ 0.04 = 30,000 kg/h, about 8.33 kg/s
• Air density at 120 °C: about 0.898 kg/m³
• Volume flow: about 9.28 m³/s, or 33,400 m³/h

If the dryer and cyclone need 2,000 Pa (about 204 mm WC), air power is about 18.6 kW, and at 70% efficiency the blower needs about 26.5 kW at the shaft. This is a moderate duty, well within our range. See industrial drying and process air.

Dust at Crushers, Screens, and Transfer Points

Mineral processing plants generate dust everywhere material is crushed, screened, or transferred. Most of these collectors are modest, clean-side, backward-curved blower duties. Abrasive dust unbalances and erodes wheels over time, so filtered intakes, cleanable construction, and vibration monitoring matter. See dust collection system design and maintaining industrial blowers.

Pneumatic Conveying of Concentrates

Fine concentrates and powders are sometimes conveyed pneumatically over short distances. Centrifugal blowers suit dilute-phase conveying at low to moderate pressure, and denser or longer conveying moves beyond our range into positive-displacement territory. See low-pressure pneumatic conveying and centrifugal versus positive-displacement blowers.

Underground Ventilation and Extraction

Mineral processing sometimes extends underground, and auxiliary extraction and ventilation ducts there are a centrifugal blower duty within our pressure range, for non-gassy workings. Gassy mines need Group I equipment, which we do not manufacture, so tell us if a mine is gassy and we will confirm what we can supply. See combustible dust and hazardous atmospheres.

Remote Sites and Serviceability

Mines and mineral processing plants are often far from suppliers, so choose standard components, hold spares such as bearings, belts, and balance weights on site, and favour designs that can be inspected and cleaned without specialist tools. A simple, recorded routine of vibration and current readings catches most problems before they become breakdowns. See maintaining industrial blowers.

Heat and Altitude

Many mining regions are hot, and some sit at altitude, which reduces air density and the pressure a blower develops at a given speed. Correct every selection for the site’s real density, and check motor power at the coldest, densest start-up condition. See gas temperature, altitude and density correction.

Wear and Abrasion

Mineral dust is often highly abrasive. Backward-curved wheels on the clean side of a filter handle moderate dust well, but where a duty would put abrasive material directly through the wheel, that is dirty-side, radial-wheel territory, which is outside our range. Keep the blower on the clean side wherever the system allows.

Standardising Across a Site

A mine or processing plant with many similar dust collectors, dryers, and cooling fans benefits from standardising on a small number of blower models rather than specifying each duty individually. Fewer distinct models mean fewer spare parts to stock, faster fault-finding because technicians know the equipment, and simpler procurement. When a new transfer point or cooling duty comes up, check whether an existing model on site already covers it before specifying something new.

Where Our Range Fits

NextAir Systems manufactures centrifugal blowers up to 800 HP (about 597 kW) and up to 500 mm WC (about 4.9 kPa) static pressure, with backward-curved and forward-curved wheels. That covers mineral drying, clean-side dust collection, short-distance conveying, cooling, and non-gassy underground extraction. Very large primary dust-collection systems, dirty-side abrasive duty, and gassy-mine equipment are outside our range.

What to Specify

1. Duty: drying, conveying, dust collection, cooling, or ventilation.
2. Airflow and resistance, at clean and worst-case conditions.
3. Material abrasiveness and moisture content.
4. Site altitude, ambient temperature, and remoteness.
5. Whether any underground workings are gassy.
6. Control approach and spares strategy.

Commissioning at a New Processing Plant

At commissioning, measure each blower’s airflow and pressure against its curve, confirm rotation, and record baseline vibration and motor current. Check the operating point at worst-case resistance, such as a loaded dust-collector filter, and stay clear of instability. On a new plant with many similar blowers, recording a baseline for each one, not just a sample, pays off later: a fault on one unit is far easier to diagnose when you can compare it against its own commissioning reading rather than a generic figure. See blower curves, system curves and operating point drift.

Get a Blower Selection for Your Mining Operation

Send your duty, material, and site conditions, and we’ll size the blower and confirm the range. Contact us for a free quote.

Frequently Asked Questions