Spiral Concentrator

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

As a turnkey supplier of gravity concentration equipment across the world, Multotec can deliver end-to-end spiral solutions, from process audits and test work, to complete spiral concentration plants optimised for your process. With our global branch network, we support your application with tailored field service and complete availability of spares for your plant.

We manufacture a wide range of spiral sizes and configurations that can be optimised to your application.

Our gravity concentration range includes:

  • Beneficiate material between 38 and 2000 um, depending on ore type
  • Available in single, double and triple starts
  • Spirals range between small diameter (+/- 560 mm) and large diameter (+/- 950 mm)
  • 3 to 12 turn spirals as required by your application
  • High separation efficiency reduces the number of stages on a plant, reducing overall footprint
  • Sliding or auxiliary splitters can be used to achieve targeted grades and recoveries
  • Auto Reject Channel® offers excellent removal of unsuitable particles
  • Trough surfaces are sprayed with polyurethane to required thickness to improve the service life of the spirals
  • Test work can be conducted for spiral concentrators to simulate client flowsheet


  • Ultrafine chrome spiral
  • Coarse (-3 mm) particle spiral
  • Lowcut spiral (1.49) for coal application
  • Large diameter cleaner and recleaner stage spiral

Leading mining houses, including Glencore Xstrata, Anglo Coal, BHP Billiton, OceanaGold, QM and Rio Tinto, use Multotec mineral processing equipment. 

We’ll help you lower your cost per ton targets

Our process engineers will work with you to optimise your spiral concentrator plant taking into consideration the feed grade and targeted product grade, recoveries and mass yields.

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.

Spiral separation 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 spirals, reducing lead times to ensure maximum processing uptime.

Our gravity separation services include:

  • Test work on spiral concentrators, laboratory and test plants
  • Consultation on spirals, processes and your plant
  • Commissioning of all spiral equipment
  • Ongoing optimisation
  • Design assistance to customers

Spiral separators for heavy minerals

Our gravity separators for heavy mineral applications, including iron ore, chrome, mineral sands and other high density minerals, separate particles in the size range 2 to 0.04 mm.

We have a range of spirals, from 3 to 12 turns, with high-, medium- and low-gradient profiles. Our high capacity spirals (the HX series) provide a per-start tonnage rating of 4 to 7.5 tons per hour, 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 +/- 950 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 start spirals 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 gravity concentrators are precisely designed and built from high-quality materials that provide a long service life, lower costs of operation and low maintenance.

The science behind the spiral

Spiral concentrators are simple low energy-consuming devices used for mineral separation 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.

As the mineral stream is fed from the top of the spiral, a combination of forces act on particles as they move down the trough of the spiral circuit. 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.

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


Lower your cost per ton with our mineral processing equipment!

In the News


As West Africa’s mining sector continues to grow, Multotec is steadily increasing its base of solutions in the field.

Speak to a Multotec consultant today about how we can manufacture
a performance-enhancing process solution for you!


Coal Spiral Concentrators

Coal spiral concentrators reduce floor space requirements, have long life, and reduce maintenance costs.

View Coal Spiral Concentrators Product Details

Mineral Spiral Concentrators

Mineral spiral concentrators from Multotec reduce downtime, increase productivity and reduce plant footprint.

View Mineral Spiral Concentrators Product Details

Spiral Test Units

Spiral test units from Multotec are tailored for both heavy mineral and coal applications, designed for flexibility during the testing and flow sheet development phase.

View Spiral Test Units Product Details

Gravity Slurry Feed Distributors

Gravity slurry feed distributors boost productivity, save floor space and offer long-lasting performance in highly abrasive mining applications.

View Gravity Slurry Feed Distributors Product Details

Launder Systems

Multotec's launder systems facilitate enhanced productivity through their modular design, long life, ease of installation and quick lead times.

View Launder Systems Product Details

Spiral Accessories

Spiral accessories from Multotec ensure longer product life.

View Spiral Accessories Product Details

SX7 and MX7 Coal Spiral Concentrators

SX7 and MX7 coal spiral concentrator for long life, low maintenance and enhanced flexibility.

View SX7 and MX7 Coal Spiral Concentrators Product Details

SX4 Coal Spiral Concentrators

Multotecs™ SX4 coal spiral concentrators are built for long life and low maintenance, with flexibility for when building or replacing the spiral plant.

View SX4 Coal Spiral Concentrators Product Details

HX and SC Mineral Spiral Concentrators

Multotec's HX and SC mineral spiral concentrators have various configurations and allow for separation of fine heavy minerals from 1.5 mm to 0.04 mm.

View HX and SC Mineral Spiral Concentrators Product Details

Coal Spiral Test Units

Multotec's coal spiral test units have plug and play capability and are able to process up to 36 tons of coal per hour.

View Coal Spiral Test Units Product Details

Heavy Mineral Spiral Test Units

Multotec's heavy mineral spiral test units are supplied by pumps driven by variable speed drives, operating between 380 V or 525 V and processing up to 20 tons per hour.

View Heavy Mineral Spiral Test Units Product Details

Orifice Type Gravity Slurry Feed Distributors

Multotec's orifice type gravity slurry feed distributors enhance accuracy and increase productivity through 36 outlets.

View Orifice Type Gravity Slurry Feed Distributors Product Details

Slot Type Gravity Slurry Feed Distributors

Slot type gravity slurry feed distributors extend product life and its up to 36 outlets come standard in 3 diameter sizes.

View Slot Type Gravity Slurry Feed Distributors Product Details

Pipe Launder Systems

Our pipe launder systems, with single or double stage options, are easy to install and facilitate increased uptime.

View Pipe Launder Systems Product Details

Product Collection Launder Systems

Our product collection launder systems are modular in design, facilitating ease of transport and installation in any onsite operation.

View Product Collection Launder Systems Product Details

Speak to a Multotec consultant today about how we can manufacture
a performance-enhancing process solution for you!