How to reduce wear on conveyor belts carrying abrasive materials

Conveyor belts in crushing and mineral-processing plants carry a punishing mixture of sharp rock, fines, coal, cement clinker and mineral residues. Each load can abrade the cover, cut the edges, distort the belt or damage a splice before the conveyor reaches the next stage. For Australian operators, belt failures are especially costly when a stopped conveyor can idle an entire crushing and screening circuit.

Belt wear is usually the combined result of abrasion, impact, tension and poor tracking. Material may enter at excessive velocity, stick to damp pulleys, build up in skirtboards or concentrate in a surge at the feed point. A belt that is already running off-centre will then rub against the stringer or edge guards, turning a minor cover problem into a major failure.

Australian conditions make careful control essential. Pilbara iron-ore operations and Hunter Valley coal plants handle sharply angular products, while hot, dusty fixed-plant environments accelerate cover ageing. FIFO rosters and long resupply distances also mean a damaged belt can stop production while replacement equipment or technicians travel. Mobile-crushing contractors face the same issue when working across regional road networks with heavy equipment.

The most effective control is a system rather than a single measure. Belt selection, crushing performance, transfer-point design, operating discipline and planned maintenance must work together to reduce the load reaching the belt and to catch deterioration before it becomes a shutdown.

Know the abrasive load

Start by identifying exactly what is reaching the conveyor. Obtain samples from the discharge rather than relying only on the name of the ore or rock. Record particle size, shape, moisture, hardness and the proportion of fines. Angular quartz-rich gravel may be highly abrasive even when it is not exceptionally hard, while iron-ore fines can work into cover creases and remain trapped for long periods.

The material's moisture and temperature also matter. Wet material may reduce abrasion initially but can cause carryback, pulley polishing and belt tracking problems. Dry cement clinker, slag and hot mineral products can degrade rubber quickly. Coal is generally less aggressive than hard rock, yet sharp coal and stone picked up from the mine floor can still cause severe cuts and impact damage.

Measure where the wear is occurring. Cover loss at the centre of the belt suggests abrasion from the normal material stream, while diagonal damage often points to misalignment or a pulley problem. Edge wear can indicate side run, uneven loading or an undersized skirt. Splice damage may result from a material surge rather than poor splice construction. A simple marked inspection area beside each critical belt section makes these differences easier to recognise.

Choose the belt for the duty

A heavier belt does not automatically solve abrasive wear. The cover grade, carcass construction, belt width and overall tension must match the load. An EP or NN belt may suit moderate aggregate duty, while a steel-reinforced belt can handle high tension and long transport distances. Highly abrasive sites may benefit from a high-performance cover compound or ceramic lagging, provided the application does not expose it to excessive heat, oil or fire risk.

The loading rate and impact energy should be considered alongside the material description. A wide, heavy belt running at low tension can still be damaged by a large rock striking the belt from a poor transfer point. Conversely, an excessive belt tension increases the load on bearings, pulleys and splices. The correct specification balances containment with reasonable mechanical loading.

General belt maintenance guidance can support this assessment, but the final choice should reflect the plant rather than a generic duty table. Australian buyers should also consider access to local belting suppliers, splice technicians and stockholding, particularly for remote operations where a damaged belt may require freight to be moved by road or freight aircraft.

Splices and lagging deserve the same attention as the belt itself. Use an approved splice design for the carcass, load and tension, and inspect lagging for edge lifting or debonding. Pulley lagging should be bonded securely without creating a step that catches material. A supplier able to provide matched belt, lagging, splice materials and technical calculations reduces the risk of incompatible components.

Protect belts at loading and transfer

Most severe belt damage begins where the material changes direction. A chute should deliver material onto the belt at a controlled velocity and in the correct position. Feed that lands directly from a high point causes impact, while material entering at an angle pushes the belt sideways. Adjustable skirts, rock boxes and properly sized impact beds can spread the force over a larger section of the belt.

Transfer chutes need enough capacity to handle peak feed without a surge. Inspect liners, skirtboards and sealing curtains for wear, as damaged components allow material to escape and strike the belt edge. The chute should also prevent fines from building up behind seals and entering the return strand. Routine clean-outs are more effective than allowing a difficult deposit to harden and then break away in slabs.

Pulley condition determines whether the belt runs smoothly. Rubber lagging should remain bonded, and pulleys should be free of sharp weld projections, adhering fines and polishing. Check alignment through the pulley rather than only at the drive end. Incorrect tracking tension can make a belt wander toward one side, while excessive take-up can flatten the cover and increase splice stress.

Keep the belt clean and the working area clear. Material trapped in idlers creates an uneven surface that repeatedly bends the belt in the wrong direction. Australian crews are well placed to recognise these local operating patterns, but the inspection should be scheduled and recorded rather than left to an occasional visual check during a shift handover.

Reduce impact at the crushing stage

Crushing is often the best place to reduce abrasive loading because smaller and more uniform feed is easier to convey. A jaw crusher may provide a dependable primary reduction, while cone and impact crushers can prepare a controlled product for screening. Shanghai CME Mining and Construction Machinery Co., Ltd. supplies these crushing systems along with sand-making machines, vertical mills and trapezium mills for cement and mineral-processing duties.

Crusher settings should match the conveyor's capacity. Running a circuit too close to its maximum creates surges, while an undersized crusher can generate excessive fines and overload downstream equipment. The relationship between rotor speed and shape is particularly relevant to vertical-shaft impact crushing, where changes in rotor tip speed affect the shape and grading of the product carried by the belt.

Vibrating feeders should provide an even bed across the belt width. A short feed presentation may improve local stress but can cause uneven loading along the belt. Feed control, crusher capacity and conveyor speed should be reviewed together rather than adjusted in isolation. A brief surge from a full hopper can produce enough impact to open a splice or cut the cover.

Screening and washing can further reduce the conveyor load by separating unsuitable size fractions or removing clinging material before transport. This is useful in aggregate plants where fines build up in a surge bin and at cement plants where hot, fine clinker is abrasive. Any improvement should be judged against the extra water, maintenance and energy required by the washing or screening stage.

Monitor wear and maintain the line

Condition monitoring turns belt inspection into usable operating data. Establish fixed points along the loading zone, drive pulley, take-up and splice. Measure remaining cover thickness, inspect for cuts, record edge wear and photograph damaged areas for comparison. A handheld depth gauge or another suitable measuring device gives more reliable information than visual judgement alone.

Record inspections in the site's maintenance system and link them to production records. A rise in cover wear after a crusher adjustment may reveal a changed product shape, while faster edge deterioration can indicate tracking drift. Useful indicators include tonnes conveyed, operating hours, splice condition, cover loss, unplanned belt stops and the quantity of belt replaced.

Maintenance windows should include more than changing a visibly worn belt. Inspect idlers, pulleys, chutes, skirts and vibrating feeders while access is available. On FIFO sites, technicians may not be present when deterioration first appears, so photographs, trend data and clear limits for continued operation are especially valuable. Any inspection involving a hazardous belt requires isolation in accordance with the site's safety procedures and applicable Australian work health and safety requirements.

Cleaning should use methods approved for the belt cover and the surrounding equipment. Some solvents and wash methods can swell or soften rubber, while abrasive blasting can damage the cover. Train personnel to recognise early warning signs such as unusual noise, rising temperatures, material leakage and repeated mistracking, and define who has authority to stop an affected conveyor.

Turn observations into a site program

A durable wear-control program brings operations, maintenance, process engineering and procurement together around the same measurements. Begin with the belts that create the greatest production exposure, establish their current wear rate and identify the dominant damage mechanism. Belt improvements can then be tested against a clear baseline rather than judged by appearance alone.

Change one variable at a time where possible. Altering crusher settings, feeder presentation, belt speed or transfer geometry may reveal which action produces the greatest benefit. Record the result over comparable production tonnes, including any changes in product grading and downstream equipment performance. This avoids transferring a problem from one section of the plant to another.

Procurement decisions should consider the full operating cost. A longer-lasting belt may have a higher purchase price yet reduce emergency replacements, labour and production downtime. The processing equipment catalogue from Shanghai CME includes crushers, grinding and screening equipment, sand-making machines, vibrating feeders, conveyors and mobile crushing plants, allowing equipment and belt requirements to be considered as one material-flow system.

For Australian sites, technical support should be paired with realistic logistics, local content, access to consumables and clear commissioning arrangements. The strongest result comes from controlling the material at the crusher, protecting every transfer point and using condition data to adjust the line before failure. That combination turns belt wear from an unavoidable operating cost into a manageable and measurable part of plant performance.