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Reservoir & Power Station Chemistry

Experimental derivation of thermodynamic data on mineral solubilities and metal-transport mechanisms that are site- or situation-dependent, and which can be applied to geothermal fluid chemical modelling; and investigation of scaling, corrosion, safe disposal of fluids and mineral extraction technologies

Project Leader: Ed Mroczek

Research Collaborators: Quest Integrity

Task 1: Silica, corrosion & lithium (Task Leader: Ed Mroczek)

  • Model for heavy reduction / deposition corrosion of carbon steel and alternative materials identified that are resistant to this form of corrosion
  • Clean steam from dirty geothermal power station steam
  • Effect on silica scaling of polymerisation and agglomeration of colloidal silica particles formed under different process conditions
  • Mineral recovery experiments to determine realistic recovery economics with co-production of power
  • Removal of silica and arsenic from geothermal fluids by electro-coagulation
  • CO2/H2S chemistry/corrosion experiments

Task 2: Experimental geochemistry (Task Leader: Bruce Mountain)

  • Antimony speciation at high temperatures
  • Thermochemistry of gold-ammonia complexing in geothermal fluids

Task 3: Tectonics (Task Leader: Agnes Reyes)

  • Feasibility assessment of underground mines as unconventional heat sources
  • Distribution of halogens in the Hikurangi fore-arc
  • Low temperature geothermal tectonic regions of New Zealand
  • Thermochemistry of oil field and mine waters