THE DNi PROCESS DISRUPTIVE TECHNOLOGY

  • The DNi Process™ has been developed to produce nickel metal, oxides or hydroxides. The DNi Process™ is based  on  elegantly simple  chemistry:  with  continuous,  rapid  tank  leaching,  achieving  high  metal  recovery rates, particularly of nickel and cobalt but also of iron as hematite and magnesium oxide.
  • The DNi Process™ is most efficient at extracting nickel from laterites and is the first process to treat the entire profile  of  a  laterite  deposit  –  limonite  and  saprolite  –  meaning  much  better  economic  use  of  the resource, effectively doubling resource utilisation.
  • A key feature of the DNi Process™ is that over 95% of the leach reagent, nitric acid, is recovered and recycled, lowering production costs and efficiently reducing associated environmental issues.
  • Plant Capex is estimated to be less than half those of existing processes in part because the DNi Process™  does  not  require  high  pressures  or  high  temperatures,  or  exotic  materials  of  construction. Also, the minimum threshold plant size is around 5,000 tpa nickel output, significantly smaller than the entry-level plant which competing technologies must build.
  • A  DNi  Process™  plant  can  be  constructed utilising  commercially  available  off-the-shelf equipment and well-proven stainless steel fabrication techniques. Plant construction can be modular, further de-risking scale-up costs.

 

THE DNi PROCESS ENABLING TECHNOLOGY

  • DNi’s  technical  partners include Drinkard Metalox Inc. and the CSIRO, both of which have considerable experience  in mining  and  minerals  processing  and  recognise  the  distinct advantages  of  the  DNi  Process™ when compared to existing technologies.
  • The DNi Process™ has been significantly de-risked with the assistance of these partners and through rigorous testing of the reagent recycle process at the pilot plant in Perth, Western Australia.
  • The DNi Process™ is environmentally friendly because almost all the reagent is captured and recycled. The  mass  of  waste  residues  is  less  than  half  that  of  HPAL  processes principally due  to  minimal  loss  of  the reagent and the addition of fewer neutralising  agents.  Also,  nitrates  in  processed  residue break down to usable nitrogen for plant growth. This may prove to be a major advantage in nitrogen deficient high-rainfall tropical environments and a boost to local agriculture.
  • The economics of the DNi Process™ includes the production of saleable co-products, significantly increasing project revenue.

 

WHY DNi?

The DNi Process™ is:

  • A unique opportunity because the only commercially available, internationally implemented, process which can match DNi’s flexibility in output is High Pressure Acid Leaching (HPAL)  – unlike HPAL, the DNi Process™ is capable of treating the entire saprolite profile whereas the more saprolite added to the HPAL process renders it less profitable.
  • The only process available which can treat the whole limonite/saprolite ore profile (from 90% limonite to 100% saprolite) enabling maximum recovery of saleable products from the mine.
  • Able to treat just limonite ore (provided 3-4% (by weight) magnesium is added to the feed).
  • Can easily adapt to changing market demands with the simple addition of different refining units on the back end of the processing plant. The principal markets for DNi’s output, currently, are:
    • The Stainless Steel market: Nickel metal, Cobalt metal or Cobalt oxide;
    • The Rechargeable Battery market: NiCO3 and other Ni/Co products.

 

NICKEL USES – TODAY AND TOMORROW

  • Nickel is widely used in over 300,000 products for consumer, industrial, military, transport, aerospace, marine and architectural applications.
  • The biggest use of nickel is in alloying – there are approximately 3,000 nickel-containing alloys – about 90% of all new nickel sold goes into alloys with about two-thirds going into stainless steel.
  • Current uses for nickel-containing materials include: electronics, specialist engineering, coinage, marine engineering, food preparation equipment, mobile phones, medical equipment, hybrid cars, buildings and power generation. They are selected because they offer better corrosion resistance, better toughness, better strength at high and low temperatures and have a range of special magnetic and electronic properties. In many of these applications there is no substitute for nickel without reducing performance or increasing cost.
  • Stainless steel represents the single largest use of nickel and typically contains 8-12% nickel. Some nickel-based alloys with higher nickel contents are used for more demanding applications such as gas turbines and some chemical plants.
  • Nickel is a key element in several rechargeable battery systems.
  • Developing uses for nickel include:
    • nanoparticle nickel – utilised in 3D printing of sensors with a high spatial resolution, such sensors will be embedded within the layers of printed circuit boards opening up a world of possibilities for the monitoring of various energies and their derivatives such as capacitance, magnetism, temperature and radiation; and
    • the production of faster, purer and cheaper graphene.
  • Nickel use is growing at around 4% each year.

 

DNi’s 2017 OBJECTIVE – TO ACCELERATE COMMERCIALISATION

  • DNi’s principal commercial objective for 2017 is to execute a licence agreement for the DNi Process™.
  • DNi will provide the processing technology and technical support to its customers who will construct and own the nickel processing facility.
  • In return, DNi will receive a combination of licence fee, service contract and equity share, negotiated on a case-by-case basis. DNi will not be involved in the raising of capital required for the construction of processing plants.
  • DNi is currently pursuing opportunities with one large group in the Philippines and two companies in Australia whilst other discussions are ensue.
  • DNi is currently completing the required documentation to meet industry expectations regarding proof of process.
  • Whilst the company has a good understanding of the expected operating costs (see Indicative Costs document) the estimated capital cost has likely been overstated (due to an assumption of equipment procurement in Australia and the USA) – the company has commenced working with an engineering group to refine the design of  10, 20 and 30,000 tonnes per year plants so that capital costs can be more accurately calculated.

 

TECHNOLOGY DEVELOPMENT & TESTING

The 1 tonne/day DNi Pilot Plant at CSIRO’s research centre in Perth, Western Australia has proven that the DNi Process™ is simple and safe to operate on a continuous basis, with metal recoveries and reagent recycling meeting and, in many cases, exceeding expectations.

The DNi Process™ is protected by registered patents.

 

This graph illustrates the leaching times for various hydrometallurgical nickel laterite processes. The data is all taken from publically available sources, and demonstrates the residence time differences between currently operating technologies and new processes in development. As can be seen, most of the technologies that utilise strong mineral acids (nitric, sulphuric, hydrochloric) in an agitated tank configuration all show reasonably similar leach residence times, although HPAL benefits from a shorter tail due to the higher pressure and temperature and PosNEP benefits from an ore pre-treatment (the time of which is not included here). Weaker acids obviously require longer leaching times, as do less ideal configurations like heap leaching.