Eco-Process
Kohsei Kitakyushu plant started recycling cemented carbide wastes such as WC rolls, drills by Zn-distillation process since the plant was built in Feb 2000.
It is known that the cemented carbide is composed by high hardness particles (WC, TiC, VC, etc) and binder metals (Co, Ni, Fe, etc). In the Zn-distillation process, melt Zn dissolves the binder metals so that the hard particles could fall apart easily.
After Zn is evaporated at elevated temperatures, binder metals precipitates on the surface of hard particles. The distillated alloy is milled into fine powders finally.
One of the advantages of Zn-distillation process is that the recycled cemented carbide powders have the same chemical composition as raw materials. And besides, it is an economical and environmental process which does not generate any wastes and pollution.
Ionization Process
As the Zn-distillation process has limitation of productivity and products’ species, we have developed an ionization process for recycling cemented tungsten carbide wastes. In the ionization process, the binder metal is ionized into liquid solution and WC particles are left alone. The WC powders which are recovered by this process have the same as close-to quality as virgin powders.
Product Specifications
Recycled WC Powder Composition
| Al | ≦15 | Mo | ≦50 |
|---|---|---|---|
| As | ≦10 | Na | ≦15 |
| Bi | ≦3 | Ni | － |
| Ca | ≦10 | P | ≦10 |
| Cd | ≦5 | Pb | ≦5 |
| Co | － | S | ≦20 |
| Cr | － | Sb | ≦10 |
| Cu | ≦5 | Si | ≦20 |
| Fe | － | Sn | ≦5 |
| K | ≦5 | Ti | ≦10 |
| Mg | ≦10 | V | ≦10 |
| Mn | ≦10 | O | ≦1,000 |
High Quality Resycled Products
With the shortening of the supply and increasing of prices of raw materials, demands for recycled products have been increasing. More and more recycled WC products are used for cemented tungsten carbide products. Our plant always take the quality assurance as our first purpose and follow the regulations of environment protection, personal health and laws, Therefore, we established our new analysis center and installed many advanced instruments such as ICP, AES, SEM, EDS, Fluorescent X-ray, PSD analyzer. The analysis and evaluations of products are growing to be more accurate and repeatable.
Others
*We can customize specifications to meet customers' need. Please feel free to contact us.
*The processing service of cemented tungsten carbide recycling is also available at our plant.
*We are purchasing cemented tungsten carbide scraps at any time.
