Spiral separator

Coal Spiral Test Units

Coal spiral test units, available from Multotec, consists of the MX7 or SX7 spirals, which are designed to be two stages in one and are capable of processing 36 tons of coal per hour to the spirals.

Pumps and sumps can be operated using generators and are fitted with variable speed drives that can operate at 380 C or 525 V. Each plant can be transported to any location, using only two 12-metre containers and the plant’s design enables it to stand on a level concrete pad or compacted surface.

Benefits of Coal Spiral Test Units:

  • Stand-alone units which can be skid mounted
  • Easily erected on-site, easily moved and re-erected
  • Three primary modules
  • ‘Plug and Play’ capability
  • Optional extras include samplers and process flow meters

Multotec offers commissioning and installation for coal spiral test units as well as consultation services and test work on spiral concentrators at our R&D facilities or at plant sites.

Enhance your mineral processing operation with our gravity concentration solutions.

Components and advantages

Mild steel ceramic tiled cyclones

  • Suitable for fine coal desliming
  • Dedicated discharge tanks for underflow
  • Dewatering cyclone (optional)


  • Suitable for coarse particle rejection prior to spirals

Dedicated control panel

  • Variable speed drives for each pump allows ease of control
  • 380/525V (optional)
  • Lockable IP65 control box enclosures

Gravity fed distributor

  • Mild steel galvanised and with polyurethane lining
  • Provides even distribution of feed to spirals
  • Easily replaceable parallel throat orifices
  • Tight fit piping arrangement

Multotec spirals

  • Equipped with four triple start MX7 or SX7 spirals

Cat ladders

  • Provides easy access to upper levels

Sumps with pumps

  • Three dedicated mild steel rubber-lined sumps with pumps


  • Additional steel supports supplied for extra stability
Multotec is a pioneer in coal spiral test units with a ‘plug and play’ functionality that can be easily moved to new locations.
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