Neomet Process

The Neomet Process provides energy efficient and environmentally friendly proprietary processes, designed to effectively extract valuable metals for a wide spectrum of base, light and precious metal oxides and sulphides, intermediates and waste feeds.

Efficient Metal Extraction

A series of patented extractive metallurgical processes have been developed and are now available for commercial license. These processes include cyanide-free gold and silver processes (especially for refractory and arsenic-containing ores), nickel laterite processing, titanium and vanadium processes, energy from sulphide-based ores and rare metals recovery processes.

Low Energy and Environmental Impact

The processes are based on cost effective processing methods, designed to extract high purity primary and secondary metals from crushed ore to compound concentrates and refractory deposit mineral tailings. The process designs are configured to recover the maximum value from the ore feed, minimising tailings and providing an environmentally friendly sustainable solution to metals recovery.

The designs can also be applied to existing or old mine tailings producing additional revenues through single or poly-metallic recovery while stabilising toxic wastes.

A Unique Acid Recovery Process

The key operation unit of the Neomet process is a unique closed loop proprietary acid recovery and regeneration system that is significantly more efficient and robust than other commercially available technologies. The technology has been proven through successful completion of mini-plant and pilot plant campaigns.

Key Benefits

The hydrochloric acid-based acid recovery and regeneration system designed in combination with conventional metallurgical processes has the following benefits:

  • High metal recoveries >95% and recovery of secondary metals from poly-metallic deposits
  • High metal purities >99.5%
  • Low environmental impact including cyanide free, inert tailings, significantly lower chemical wastes, wastes and atmospheric emissions
  • Ability to treat difficult to treat ore bodies including refractory ores, carbonaceous ore , free-milling ore, laterites, low grades and ores containing toxic trace elements
  • Recycling hydrochloric acid through proprietary acid regeneration technology
  • Process operating on low temperature at atmospheric pressure
  • Commercial ready licensing arrangements
  • Scalable and robust based on proven chemical and processing fundamentals
  • Credible implementation partners Sedgman Pty Limited (Engineer, contractor and process plant Operator) and vendor (supplier of process equipment and acid regeneration package)

The metallurgical processes are tested primarily at an international standard laboratory based in Alphamet Management Pty Ltd laboratory facilities in Montreal Canada. The process flowsheet is configured and refined through various stages of project development, as per stakeholder requirements, to best suit the ore characteristics and de-risk the technical solution. The process designs are optimised to target the most effective use of capital, highest return on investment whilst ensuring reliable plant operations.


The proprietary hydrochloric acid regeneration technology when configured with conventional leaching technology has a range of practical applications for processing of virgin ore deposits, intermediate streams associated with new or existing plants, waste treatment of smelter slags or rejects, and tailings treatment or recycling.

Laboratory analysis and engineering study development previously conducted and continuing, identifies the following suitable commodity applications;

  • Precious metal recovery including gold and silver processing
  • Base metal recovery including nickel, copper, lead, cobalt, tin and zinc processing
  • Titanium dioxide and vanadium recovery
  • Lithium carbonate recovery
  • Rare earth metal recovery

Neomet Technology uses a patented hydrochloric acid recovery and regeneration process to regenerate the spent acid from the leaching stages. Using optimal combination of leaching reagents in a high intensity atmospheric leaching process, the metal values are dissolved into solution either separately or altogether. The reagents are then further treated to recover the metal components as metal chlorides or oxides. The spent acid from the leach process is regenerated in closed loop using Neomet's propriety hydrolytic distillation technology.

Metal Extraction from Electric Arc Furnace Dust and Spent Pickle Liquor

Carbon steel production by electric arc furnace (EAF) technology produces about 15 - 20kg of dust per tonne of liquid steel produced. This dust in many jurisdictions is classified waste due to its content of heavy metals.

The EAF dust forms as a result of volatile metals, like zinc and lead, passing into the vapour phase as the operating temperature of the furnace is around 1600°C. These volatiles are oxides and collected in the extractive gas air flow and find their way into the resulting dust as free oxides and in the form of composites with iron oxides. Management and disposal of EAF hazardous dust becomes an economic factor for steel mills employing EAF technology.

The EAF dust can be effectively treated by applying Neomet Technology for the extraction of the proprietary hydrochloric acid regeneration technology when configured with conventional leaching technology has a range of practical applications for processing of virgin ore deposits, intermediate streams associated with new or existing plants, waste treatment of smelter slags or rejects, and tailings treatment or recycling. saleable metals, zinc and iron, while producing an inert waste for easier disposal.

Spent pickled liquor containing iron chloride, zinc and hydrochloric acid can also be treated using this technology to regenerate the hydrochloric acid and recover the zinc and iron. The acid can be reused for pickling.

Precious and Base Metal Industries Including Tailings Recycle

Neomet Technology is a hydrochloric acid-based metal extraction process that can be applied for the extraction of not only gold and silver, but also associated metals from refractory and carbonaceous gold ore concentrates and intermediate materials. The process does not require the use of cyanide to recover gold, nor does it require pre-treatment methods such as pressure oxidation or ultrafine grinding to liberate gold from the refractory matrix.

It is also possible to recover gold and silver separately or together and allows for the recovery of other value metals such as copper, nickel, cobalt, rare earths, minor rare metals such as scandium, gallium, and indium as well as the platinum group of metals. The process fixes the arsenic present in the ore or tailings as an inert scorodite and recovers almost all of the acid used in the process.

Titanium Dioxide Production

Titanium dioxide is conventionally produced through the chloride and sulphate process. In the chloride process, Ilmenite, synthetic rutile or Ti slag is chlorinated at a temperature of about 1,000°C in the presence of carbon to produce titanium tetrachloride which is oxidised in the presence of oxygen to produce rutile grade titanium dioxide. In the sulphate process Ilmenite or Ti slag is reacted with concentrated sulphuric acid to produce titanium and iron sulphates. Titanium dioxide is precipitated from the combined sulphate solution and calcined to produce Anatase grade titanium dioxide. The sulphate process produces a lot of acidic wastes that must to be neutralised for safe disposal

Titanium dioxide (Anatase and rutile grade) can be produced using the Neomet Technology process. The Ilmenite, synthetic rutile or Ti slag is reacted with hydrochloric acid under atmospheric pressure and temperature below 95°C. All metals including titanium and iron dissolves forming their respective chlorides. The leach solution containing the metal chlorides is passed through the Neomet acid regeneration process to recover the acid and iron oxide. Titanium is precipitated from the leach solution and calcined to produce the titanium dioxide. The process produces very little benign waste and all the acid used in the process is recycled. Associated metals like iron and aluminium is recovered as coproducts. The ilmenite does not need any pretreatment prior to the leaching.

The main advantages of the Neomet process for the production of titanium dioxide are as follows.

  • Both grades (Anatase or Rutile) can be produced by altering the process conditions
  • Co products like vanadium, iron and aluminium oxides can be recovered
  • Very little benign waste is produced from the process
  • Almost all the acid used in the process is recycled through the proprietary acid regeneration process

Nickel Laterite

Mine managers can overcome the problem of wasted metal in their nickel laterite processes by converting toxic tailings into potentially marketable metal byproducts. What remains is rendered inert. Neomet Technology processes have the capability to effectively extract cobalt, iron, magnesium, aluminium and other metals including rare earths.

Development Pathway

The pathway for developing a Neomet Technology based metalliferous project is consistent with industry standards. Project initiation leads to various levels of feasibility study, definition, design and into project implementation and ultimately the commercial production phase.

Prior to entering into a full scale metallurgical test work program to support study activities it is often recommended that a preliminary sighter-level evaluation test of representative ore sample is conducted at the Alphamet Management Pty Ltdlaboratory in Montreal. This initial test will be completed at no cost to the client and is aimed at providing the following outcomes:

  • General characterisation of the ore sample
  • Suitability of the Neomet Technology process for extracting saleable products
  • Defining a suitable development pathway for more detailed assessment

The Parties

Alphamet - Neomet Technology IP Manager and Sub-Licensor

Alphamet Management Pty Ltd (Alphamet) is a subsidiary of Neometals Ltd and is the global manager and exclusive sub-licensor of the proprietary acid recovery process and other chemical processes that can be integrated with hydrometallurgical process plant designs to improve recovery of saleable metals from clients' ores.

Pro-forma non-exclusive license agreements will be issued from Alphamet to the client to facilitate the implementation of the Neomet Technology.

Alphamet's laboratory, based in Montreal Canada, is a hydrometallurgical and chemical process extraction facility, specifically established to evaluate Neomet Technology related projects. The facility is designed to test metallurgical ore samples from run of mine or composites to saleable mineral and metal products. The vendor equipment and analysis techniques used enable clients to directly relate resource, process recovery and saleable product volumes in a reliable and controlled manner.

Sedgman - Project Implementation Partner for Global Clients

Sedgman Pty Limited (Sedgman) is nominated by Alphamet as the exclusive global provider of engineering and project delivery services associated with the applying Neomet Technology in the mining and resource sector. Sedgman’s market leadership in the planning, design, construction and operation of processing plants and infrastructure provides a complete solution for clients from early stage project development through into production.

Sedgman is an independent professional organisation with significant mineral processing and hydrometallurgical expertise and leverages their technology leadership and resource engineering to determine the most viable process route and development pathway for resource owners.

Sedgman is the primary point of contact for clients who wish to scope, study, define and implement small and large-scale process plant projects. Sedgman’s strong history in pioneering and driving performance through innovation and commercialising technologies in complex applications provides certainty in study and project outcomes.

Sedgman will work closely with the client to execute the study engineering activities to international standards and best practice methodologies under a consultancy style arrangement. Following the project Financial Investment Decision, Sedgman will execute a turnkey package under a contracting model that offers the client best value, including fixed price EPC, D&C, EPCM or Design Build Operate model (DBO) and Build Own Operate (BOO) arrangements.

Acid Regeneration Process - Equipment Vendor

The proprietary acid recovery and regeneration process will be supplied and supported by a reputable global equipment vendor with specialist expertise in minerals and hydrometallurgical applications. The vendor has significant market reach and capability to support installations and input into project development through the full project lifecycle.


The mother of invention.

Company's proprietary ELi Process shows potential to operate at lowest quartile costs for LiOH.

Click to learn all about ELi process and how Energy storage is set to change the world.