♻️ Recycle Carbide Process (Tungsten Carbide Recycling)


Tungsten carbide (WC) is valuable because it contains tungsten, one of the hardest and most resource-intensive metals. Recycling carbide helps reduce cost and environmental impact.


Below is the standard industrial recycling workflow:


✅ 1. Collection & Sorting


Carbide scraps are collected from:


  • CNC machining shops
  • Tooling factories
  • Fabrication & welding workshops
  • Used inserts, end mills, drill bits, wear parts


Materials are sorted into:


  • Clean carbide (inserts, end mills, rods)
  • Contaminated carbide (brazed, oily, with steel shank)
  • Mixed metal scraps


Sorting ensures clean scrap gets maximum recovery value.


✅ 2. Degreasing & De-oiling


Scrap is washed to remove:


  • Oil
  • Coolant
  • Dirt
  • Rust


This prevents contamination in the chemical recovery stage.


✅ 3. Crushing & Size Reduction


Large carbide pieces are broken down using:


  • Jaw crushers
  • Ball mills
  • Hydraulic shears


Goal: convert to uniform small pieces so it can be chemically or thermally processed.


✅ 4. Chemical or Zinc Recovery Process


A. Zinc Process (Most Common Worldwide)


1. Carbide heated in molten zinc

2. Zinc penetrates and breaks binder (cobalt)

3. Turns into a powder-like form called zinc-treated carbide

4. Zinc is evaporated and collected for reuse


Result: high-purity WC powder ready for manufacturing new tools.


B. Chemical Recycling (Amonia + Acid)


  • Carbide scrap is dissolved or leached to recover:
  • Tungsten oxide (WO₃)
  • Cobalt
  • Tantalum/Niobium (if present)


This method produces ultra-pure tungsten powder.


✅ 5. Powder Refining & Classification


The recovered tungsten powder is:


  • Filtered
  • Dried
  • Sieved
  • Graded (particle size control)


This step determines the final quality.


✅ 6. Re-carburizing


  • Some processes add carbon back into the powder to restore it to: WC (tungsten carbide) composition


  • This ensures the powder meets tool-grade specifications.


✅ 7. Re-manufacturing


The recycled WC powder is used to make:


  • New carbide inserts
  • End mills
  • Drill bits
  • Wear parts
  • Cutting tools


New tools made from recycled carbide can reach 100% of original performance.


⭐ Benefits of Recycling Carbide


  • Reduce raw tungsten mining
  • Lower CO₂ emissions
  • Save cost (scrap carbide is 3–10× value of steel scrap)
  • Sustain supply chain for cutting tools

Tungsten Carbide Recycling Explained