Mineral Ore Processing Valve Applications

The SchuF Group produces a broad range of valves for mineral processing, including pressure letdown control, drain, feed, and isolation valves.


Panorama Copper Mine
                                     Photo: ©Bigstock/Tom Roberts Photography

Valves for Severe Service

SchuF specialises in the most severe service conditions found in the mining and mineral ore processing industry. These include handling high pressure letdown (to 200 bar), high solids content, abrasive materials, corrosive chemicals or a combination of all.

 Pressure Letdown Valve for HPAL

Example drawing of a high pressure letdown control valve with severe service trim for HPAL or Activox process
Picture: ©SchuF

Mineral Ore Processing – High Pressure Acid Leach

(HPAL) Valves

Oxidative leaching processes such as HPAL or Activox (for copper, nickel, cobalt and gold), push every piece of equipment to their limit and therefore require special severe service valves. SchuF provides control, isolation, and feed or drain valves customised according to the specific mineral ore process conditions and the piping/equipment requirements. Whether it is for a high pressure (5400 kPa) acid leach process – HPAL, or a mild pressure (1000 kPa) Activox leaching process, SchuF has an appropriate valve design.  

Severe Service Valve Applications

Applications in mineral processing include: 

  1. Feed and drain valves for pipelines and autoclaves
  2. Autoclave discharge pressure letdown
  3. Flash cooling tower pressure letdown
  4. Process ore slurry isolation
  5. Autoclave isolation


1. Feed and Drain Valves for Oxidative Leaching Processes

Feed or drain valves located in or around the autoclave or flash tower must handle severe conditions – high temperature acid slurry, and high solid content. SchuF provides valves in Duplex, Hastelloy, or Titanium (1” to 36” to ASME 2500# as standard) with custom gaskets, and special coatings for the ram and valve seat. The valves have a number of advantages:


  • Fast acting, full bore flow
  • Dead space free drainage
  • No leakage to atmosphere
  • Fully hardened, diamond polished piston (extends packing life)
  • Automatic crust breaking
  • Maintainable in place

For more information, please see the drain valve product page


2. + 3. Severe Service Control Valves for HPAL Processes

SchuF provides control valves suitable for pressure letdown, feed and level control in and around the autoclaves and flash cooling towers. Key features include:

  • DN 25  (1 inch) to DN 600 (24 inch) forged or cast
  • Body geometry with constant acceleration to the seat
  • Duplex, Hastelloy and Titanium bodies
  • Special ceramic trim
  • Single or multistage letdown
  • Linear, true equal % or SchuF X3 bell curve control characteristic
  • Dead space free options
  • Easy to replace trim parts

Our expertise in material and long life trim design enables SchuF to minimise the effects of corrosion and scaling common in mineral processing applications. For more information, please see the control valve section


4. + 5. Isolation Valves for Mineral Processing Applications

The isolation of pumps, vessels and other equipment is critical to ensure operational efficiency and safety of mineral ore processing facilities. SchuF provides a range of isolation valves including Y-globe, diverter, gate, angle and high pressure isolation valves. In addition to special body materials and trim, SchuF Y-globe and Angle type isolation valves benefit from:

  • Optimised flow body design – low pressure drop
  • Zero leakage to atmosphere
  • Tight shutoff to ASME Class VI or API 598
  • Dead space free back seating option
  • Disc grinding option to clean valve seat


Y-Globe Control Valve


For more product information, please the Y-Globe product page

Special Range of Valves for Alumina Production

The SchuF Group designs and manufactures a broad range of valves for the production of alumina from bauxite. These include a 45° Y type (monobloc body, split body in line, and tank bottom) and 90° angle type valves (bayonet, three way valve, check valve and drain and sample valves). They are available in sizes 2” to 36” and in ASME 150# to 900# classes.

For more product information regarding this special valve range, please see: Alumina valves


Are you looking for a special valve design fitting your requirements?

Please contact Mr. David Donne (Global Sales Director) at: ddonne@schuf.de  or  T +49 6198 571 110

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Video gallery
A video showing the operation of a recently-manufactured SchuF powder-sampling Valve is now available-please click the link below, which will take you to the Vimeo video-sharing website. The video will begin automatically. more