Metal sludge

Separation of grinding oil and metal without quality losses

Grinding sludge
Metal sludge
Oil from NORM waste after treatment
Oil, drilling fluid
Water from NORM waste after treatment
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:

Electricity, biofuels, hydrogen, recovered oil, diesel, natural gas, as well as hybrid systems are available


Briquetting of recovered metal powder