Reducing Carryback with Vacuum Brazed Carbide Conveyor Belt Scrapers for Mining

If you’ve ever watched a conveyor belt discharge its load only to see a trail of material sticking to the return side, you know the frustration. That “carryback” isn’t just an eyesore—it’s a profit drain.

Carryback leads to:

Excessive cleanup costs (labor + downtime)
Premature wear on idlers and pulleys
Serious safety hazards (slips, trips, and belt mis-tracking)

For years, mines relied on polyurethane or standard steel scrapers. But there’s a new standard emerging from the toughest hard rock mines: Vacuum Brazed Carbide Conveyor Belt Scrapers.

Here is how they are redefining material control.

1. The “Shark Tooth” Effect: Ultra-High Cleaning Efficiency

Standard scrapers wipe. Carbide scrapers excavate.

Thanks to a hardness rating of 92.5 HRA (second only to diamond), vacuum brazed carbide tips aggressively strip away wet, sticky, or abrasive materials from the belt surface.

Result: Achieve >95% cleaning efficiency when paired with a primary scraper.
Impact: Eliminate the thin, stubborn layer of fines that usually becomes a source of carryback.

2. No More Broken Tips: The Vacuum Brazing Advantage

Traditional welding creates microscopic air pockets and oxidation points. In high-impact mining, these become stress fractures. Eventually, the carbide tip snaps off, leaving a gap—and carryback starts pouring through.

Vacuum brazing changes the game.

The process happens in an oxygen-free environment.
It creates a seamless, bubble-free metallurgical bond between the carbide tip and the steel body.
Result: No weak points. The tip stays attached even under severe shock loads (think large iron ore or jagged coal).

3. 3-5x Longer Life: The Math That Saves Money

Let’s talk Total Cost of Ownership (TCO).

While a polyurethane scraper might need replacement every few weeks in abrasive mining, a vacuum brazed carbide scraper typically lasts 3 to 5 times longer.

Less downtime: Fewer shutdowns for maintenance.
Lower labor costs: Your crew isn’t constantly changing blades.
Belt protection: By removing carryback at the head pulley, you prevent material from grinding against the belt and idlers downstream.

4. Safety: Reducing the Most Dangerous Task

In mining, cleaning under conveyors is consistently ranked as one of the highest-risk activities (entanglement, pinch points, dust exposure).

When your scraper actually works—reducing carryback by 80-90%—you dramatically reduce the need for crews to shovel spillage under a running belt. Less carryback = fewer man-hours in the danger zone.

Implementation Tips for Maximum Results

To get this performance on your site, follow these three rules:

✅ Position it as a Secondary Scraper
Install the vacuum brazed carbide scraper just after the head pulley, behind the primary cleaner. It excels at removing what the primary leaves behind.

✅ Fix Belt Tracking First
A misaligned belt means the scraper contacts one side more than the other. Install a belt tracker 3-4 belt widths upstream. A straight belt is a clean belt.

✅ Check Tension Periodically
While carbide lasts a long time, pneumatic or spring tensioners need occasional inspection to ensure the blade maintains light, even pressure against the belt.

Real-World Mining Results

Mines using vacuum brazed carbide scrapers report:

Maintenance cost reduction: Up to 40%
Unplanned downtime reduction: 25-30%
Return on investment: Often recovered within 3-6 months due to reduced cleanup labor and belt wear.

The Bottom Line

If carryback is clogging your chutes, loading your walkways, and wearing out your components, stop replacing soft scrapers every month.

Switch to vacuum brazed carbide conveyor belt scrapers. They clean harder, last longer, and pay for themselves by keeping the material where it belongs—on the belt.

“Zhuzhou OC Precision Alloy Co., Ltd. could make tungsten carbide wear parts and make your equipment use life is tens of times longer than before! We specialize in providing customized carbide wear products solutions to meet the demanding requirements of industries such as aerospace, automotive, mining, and precision machining.”