Metal sludge

Separation of grinding oil and metal without quality losses

Grinding sludge
Metal sludge
Oil, drilling fluid
Oil free briquettes

Grinding-swarf from the metal processing industry may contain metal alloys, stainless-steel and high-alloyed steel, all of which are ideal input-materials VacuDry® unit. The absence of oxygen in the VacuDry® process prevents any changes in the chemical structure of the oil, emulsions or metals during the treatment. The output material can later be sold at high prices.

Benefits of VacuDry® metal sludge plants:

  • Separation of grinding/rolling oil and metals without quality losses
  • No oxidation of metals due to oxygen-free process
  • Low energy consumption
  • Suitable for almost every industrial site because of low emissions
  • High flexibility regarding differing types of waste streams
Key Facts


Subtractive manufacturing of metal parts, filtration of cutting fluid for metal works, metal-rolling mills, steelworks

Input material:

Grinding swarf – high-alloyed steel, high carbon steel, stainless steel and carbon steel; mill scale, metal powder sludge

Output material:

Oil, water, oil free metal briquettes; TPH below 1000 ppm, 100 ppm possible

Plant design:

Fixed or mobile execution, 0.5 … > 5 t/h throughput capacity

Heating system fired by:

Fuel oil, diesel, natural gas, biofuels, electricity, recovered mineral oil fraction


Briquetting of recovered metal powder