Facility Introduction
Harima Refinery

The Harima Refinery produces nickel sulfate. Nickel sulfate is mainly used as a base material for secondary batteries for hybrid and electric automobiles as well as being used in nickel plating. Since commencing operations in 1966, The Harima Refinery (at that time Harima Smelter) has produced zinc, lead, indium, and other metals as SMM’s main smelter, but nowadays it operates as a nickel sulfate plant.

Raw Materials

Nickel / cobalt mixed sulfide with a 60% nickel grade produced in Coral Bay Nickel Corporation and Taganito HPAL Nickel Corporation, which are SMM subsidiaries, using the HPAL (High Pressure Acid Leach) process is used as raw material.

MS (mixed sulfide)

Manufacturing Processes of Nickel Sulfate

  • Pressurized Extraction

    Nickel is extracted through directly pressurizing nickel/Cobalt mixed sulfide(MS) matte by air oxidation reaction under high temperatures and pressure, and is made into a mixed nickel sulfate and cobalt solution.

  • COB Solvent Extraction Equipment

    Nickel, cobalt, and other impurities are separated using an organic solvent to manufacture pure nickel sulfate solution.


  • Nickel Sulfate

    Used for a wide variety of applications, including coloring aluminum, catalyst, and battery materials, as well as for nickel plating.