Spiral Separator

Multotec-designed spiral separators are used across the world in coal, gold, iron ore, mineral sands, platinum and chrome processing plants.

We manufacture a wide range of spiral sizes and configurations that can be optimised to match your wet or dry slurry application.

  • Single spiral, double spiral and triple spiral plants
  • 3 to 8 turns in high- and low-profile troughs
  • High separation efficiency reduces plant footprint by up to 33%
  • Achieve precise cut points and accommodate changes in material flows with sliding or auxiliary splitters
  • Auto Reject Channel® offers excellent removal of unsuitable particles
  • Trough surface sprayed with polyurethane to required thickness
  • We offer pilot scale test work for spiral concentrators

We’ll help you lower your cost per ton targets

Our process engineers will work with you to optimise your spiral concentrator plant according to feed rate, the solids concentration, the wash water addition and the position of the cutters or splitters used to separate the tailings, middling and concentrate streams.

Whether for a greenfields plant, or optimisation or refurbishment of an existing plant, Multotec has the technologies and expertise to help ensure maximum gravity separation efficiency for your plant.

Chat to your local Multotec branch about your spiral separator application! Send us your requirements.

Spiral separators for heavy minerals

Our spiral separators for heavy minerals, including iron ore, chrome, mineral sands and other high-density minerals, separate particles in the size range 1.5 to 0.04 mm.

We have 3-turn, 5-turn and 8-turn spirals with high-, medium- and low-gradient profiles. Our high-capacity spiral separator (the HX series) provides a per-start tonnage rating of 5 to 9 tph, depending on the mineral type, and is especially suited for the treatment of low-grade ore, where large tonnages are processed.

Mineral spiral separator components include the spiral trough; sliding or auxiliary splitters; launders; distributor and piping; feed box; product box and stainless steel product splitters; and the discharge chute at the bottom of the modular housing frame. Our spiral separators have a diameter of 1 000 mm.

Gravity separators for coal

Our single- and double-stage spiral separators are optimised for coal particles in the size range of 1 to 0.1 mm, providing enhanced coal washing for slurries. Their compact, modular design provides flexibility when building or upgrading your plant.

Double-stage spiral separators reduce the requirements of height and floor space in a plant, and reduce capital and operating costs. The MX7 spiral separator is ideal for difficult-to-wash coals, improving the overall efficiency of tougher separation applications.

These spiral separators are precisely designed and built from high-quality materials that provide a long service life, lower costs of operation and low maintenance.

Speak to our mineral processing division about your gravity concentration application. Contact us today!

Gravity feed slurry distributors

We manufacture orifice- and slot-type slurry distributors for your spiral separator with up to 36 feeding outlets in 50-, 75- or 90-mm bores.

Your local Multotec branch will help you with end-to-end solutions for your gravity concentration plant, from testing equipment through to field service, ongoing optimisation and any maintenance. We keep a wide range of spares and accessories for your spiral concentrator, reducing lead times to ensure maximum processing uptime.

Additional spiral separator services

Your local Multotec branch will help you with end-to-end solutions for your gravity concentration plant, from testing equipment through to field service, ongoing optimisation and any maintenance. We keep a wide range of spares and accessories for your spiral concentrator, reducing lead times to ensure maximum processing uptime.

  • Test work on spiral concentrators, laboratory and pilot plants
  • Consultation on spiral separators and your plant
  • Commissioning of spiral separator and equipment
  • Ongoing optimisation
  • Design assistance to our customers

Read more about Multotec field service offerings.

Glencore Xstrata, Anglo Coal, BHP Billiton, OceanaGold, QM and Rio Tinto use Multotec equipment.

The science behind the spiral

Spiral concentrators are simple low energy-consuming devices that separate minerals mainly on the basis of density or by shape. Spirals are widely used in mineral processing as a method for pre-concentration and have proven to be metallurgically efficient and cost-effective.

Separation on a spiral is achieved through a combination of forces that act on particles as they move down the trough of the spiral. These forces include gravitational forces, centrifugal force, hydrodynamic drag, and lift and friction forces. Apart from the forces acting on a spiral, the properties of the slurry flowing on a spiral including, solids concentration, feed rate and wash water also plays an important role in the separation on the spiral.

During separation, the heavy particles migrate toward the inner region of the trough, with lighter-density particles migrating to the outer edge of the trough. In a dry spiral separation, materials are sorted by shape. Rounder particles travel faster, are forced to the perimeter of the spiral, from where they can be collected separately from non-round material.

With over 45 years’ experience in mineral processing applications across the world, Multotec is a leading supplier of gravity concentration solutions that optimise your plant performance.

Find out more about our spiral separators, click here to contact us!

In the News

Multotec Builds High Recovery Water Treatment Plant in Middle East (Nov 2018)

After extensive test work and design, mineral processing specialist Multotec Group is commissioning a full‑scale DeSALx® plant to treat waste water from a flue gas desulphurisation scrubber, at a minerals processing plant in Oman in the Middle East.

Lower your cost per ton with our mineral processing equipment!