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Time：2025-08-06 13:44:27 Reading volume：
Industrial oil can become contaminated during use due to oxidation, contamination, or the incorporation of impurities (such as metal shavings, water, and dust). This can affect equipment lubrication, accelerate wear, and even cause malfunctions. The following are methods and preventative measures for treating contaminated industrial oil:
1. Solid Impurities: Metal shavings, dust, and particulate matter.
2. Moisture: Equipment condensate, coolant leaks, or humid environments.
3. Oxidative Deterioration: Long-term high-temperature use causes changes in oil viscosity and increases in acidity.
4. Cross-contamination: Mixing different oils or the incorporation of other chemicals.
1. Physical Filtration and Purification
- Oil Filter/Centrifuge:
- Removes solid impurities and some water using a filter element (such as a glass fiber or stainless steel filter) or centrifugal force.
- Suitable for hydraulic oil, lubricating oil, etc., and can be used for online recirculation filtration.
- Vacuum Dehydration:
- Heating the oil under negative pressure to evaporate the water (suitable for situations where a large amount of water is present).
2. Chemical Treatment
- Adsorbent:
- Adding silica gel, activated clay, or other agents to absorb water and polar contaminants (requires subsequent filtration).
- Demulsifier:
- For emulsified oil (oil and water mixed into an emulsion), demulsifiers are added to separate the water.
3. Regeneration (Deep Purification)
- Electrostatic Separation: Uses an electric field to adsorb tiny particles and colloids.
- Distillation Regeneration: High-temperature distillation separates base oil from impurities (requires specialized equipment).
- Acid Washing and Clay Refining: Used for severely degraded oil, but is more expensive.
> Note: Regenerated oil may not fully restore its performance and must be tested and qualified before use.
4. Replacing the Oil
If the oil is severely oxidized (blackened, sticky, or has a sour odor) or contains excessive impurities, it must be completely replaced and the tank/pipeline cleaned.
1. Sealed Storage and Use
- Cover oil drums and install breathing filters on equipment fuel tanks (to prevent dust and moisture).
2. Regular Monitoring and Maintenance
- Use an oil tester (such as a moisture meter or particle counter) for regular inspections.
- ｒｅｐｌａｃｅ oil and filter elements according to equipment requirements.
3. Reduce Contamination Sources
- Prevent metal shavings from entering the fuel tank during equipment maintenance and prevent leaks in the cooling system.
4. ｓｅｌｅｃｔ the Appropriate Oil
- Use synthetic oils with strong oxidation resistance for high-temperature environments and demulsified oils for humid environments.
| Scenario | Recommended Methods |
|-----------------------------------------------------|----------------------------------------------------------------------|
| Metal Shavings Mixed with Hydraulic Oil | Online Oil Filter (Accuracy ≤ 10μm) |
| Lubricating Oil Emulsification (Contains Water) | Vacuum Dehydration + Demulsifier |
| Gearbox Oil Oxidized and Blackened | ｒｅｐｌａｃｅ Oil, Clean System |
| Excessive Impurities in Cutting Fluid | Centrifugal Separation + Adding Biocide (Prevents Corruption) |
- Waste oil is considered hazardous waste and must be handled by a professional organization to environmental regulations (direct dumping is prohibited).
- Avoid open flames during filtration or regeneration, as some oils are flammable at high temperatures.
Prompt purification and preventive measures can extend oil life and reduce equipment maintenance costs. If contamination is severe or if the treatment method is unclear, consult the oil supplier or a professional purification company.
