An uncommon Grade of acid

IHP uses low grade ores to produce high-quality phosphoric acid

WAP phosphoric acid at the filter is low in concentration, about 26-28%, and high in dissolved and particulate impurities

  • SPA must be concentrated to 70%, solids and organics must be removed, and MgO levels must be low; the acid is expected to be bright green in color; SPA is significantly more costly than MGA
  • For PPA, a standard concentration is 61% and almost all impurities must be removed, with exact tolerances dependent on the downstream application (e.g. food is more stringent than detergents)
  • Many grades of WAP filter acid (e.g. based on Florida rock) cannot be upgraded owing to high levels of difficult-to-remove impurities

IHP phosphoric acid can be used “as is” for SPA and some PPA applications, giving access to higher quality product markets

  • IHP produces clean 70% acid directly, requiring no further processing for most high-value phosphoric acid applications
  • Higher grades of PPA will require additional “polishing” in which trace levels of impurities are removed through well established processes
  • The IHP technology will allow producers to access to SPA and PPA markets using grades of rock that cannot currently access these markets
  • More widespread production of SPA will permit wider adoption of liquid fertilizer techniques which permit more direct and less wasteful application of phosphate fertilizer nutrients

KPA White Paper

History, Development, Status and Opportunities for Kiln Phosphoric Acid