CSIRO researchers have developed a chemical processing method for extracting rare earth elements from Australian mineral deposits that reduces costs substantially while addressing environmental concerns that have limited domestic rare earth processing.

The process handles the complex mineralogy of Australian rare earth deposits more effectively than conventional approaches developed for Chinese ores. It also eliminates the radioactive thorium and uranium that contaminate many rare earth deposits, resolving a major environmental and regulatory barrier.

Rare earth elements are critical for permanent magnets in electric vehicles and wind turbines, phosphors in displays and lighting, and various electronics and defence applications. China dominates production, refining more than 90% of the world’s rare earths despite other countries having significant ore deposits.

The Processing Challenge

Australia has substantial rare earth deposits, particularly at Mount Weld in Western Australia and in New South Wales. But most Australian ore is shipped to China for processing because domestic processing hasn’t been economically viable.

The challenge lies in rare earth chemistry. Despite the name, rare earths aren’t especially rare geologically. But they’re chemically similar to each other, making separation difficult. Processing requires multiple stages of chemical extraction and separation to produce individual elements in pure form.

Different ore types require different processing approaches. Methods optimised for Chinese ores don’t work efficiently with Australian mineralogy. Previous Australian processing attempts used adapted Chinese methods with poor economic results.

Thorium and uranium contamination presents another challenge. Many rare earth deposits contain low levels of these radioactive elements. During processing, they concentrate in waste streams requiring expensive radioactive waste handling and disposal.

Dr Michael Zhang, who leads CSIRO’s rare earth research, said the new process addresses both issues simultaneously. The chemistry was designed specifically for Australian ore mineralogy and includes steps that separate radioactive elements early in processing, isolating them in small volumes for proper disposal.

Technical Innovation

The process uses selective leaching that dissolves rare earth elements from ore while leaving most other minerals unchanged. This initial selectivity simplifies subsequent separation steps and reduces chemical reagent consumption.

After leaching, rare earths are separated from radioactive contaminants using solvent extraction, where careful control of pH and reagent selection causes thorium and uranium to remain in one phase while rare earths transfer to another. This concentrates radioactive materials into less than 2% of the process volume.

Subsequent separation of individual rare earth elements uses improved solvent extraction cascades. The CSIRO team developed extractant chemistry that enhances separation between adjacent elements in the periodic table, which are notoriously difficult to separate.

The process recovers more than 90% of rare earths from ore, comparable to conventional methods, but uses 35-40% less reagent and energy. It also produces significantly less waste because of higher selectivity and better reagent recovery.

Laboratory demonstrations processed several tonnes of ore, enough to validate the chemistry at meaningful scale. Pilot plant design is underway to test the process at hundreds of tonnes per year, the next step toward commercial deployment.

Economic Viability

Australian rare earth processing has struggled with economics. Operating costs for previous processing plants exceeded revenues at typical rare earth prices. Companies either lost money or required Chinese prices to spike before becoming profitable.

The CSIRO process economics look more promising. Preliminary analysis suggests operating costs about 40% below previous Australian plants, bringing them competitive with Chinese production. Capital costs for new plants would be substantial, but operating economics appear sustainable.

Several factors support improved economics beyond the processing chemistry itself. Automation and modern plant design reduce labour costs. Proximity to Australian mines eliminates intercontinental shipping of ore. And growing rare earth demand supports better prices than prevailed when previous Australian plants were conceived.

There’s also a strategic value question. Reducing dependence on Chinese rare earth supply has national security implications for Western countries. Governments may provide support for domestic rare earth production beyond what pure economics would justify.

Environmental performance matters too. Eliminating radioactive waste streams and reducing chemical consumption improves sustainability credentials. Some customers, particularly in Europe, increasingly value supply chain environmental performance.

Market Context

Global rare earth demand is growing driven by electric vehicle production and renewable energy installations. Permanent magnets for EV motors and wind turbine generators use neodymium, praseodymium, and dysprosium. Demand for these elements is projected to triple by 2035.

Current supply is concentrated in China, which developed rare earth processing expertise over decades and benefits from lower environmental standards and labour costs than Western countries. Several countries including the United States, Europe, and Australia want to establish alternative supply chains.

Some non-Chinese rare earth production exists. Lynas Rare Earths, an Australian company, operates a mine in Australia and processing plant in Malaysia. The United States has the Mountain Pass mine and is developing processing capability. But these operations together supply only a small fraction of global demand.

Downstream manufacturing of rare earth magnets is even more concentrated in China. Producing rare earth elements is only part of supply chain security; manufacturing magnets and other rare earth products matters too. Some initiatives address downstream manufacturing alongside element production.

For companies using rare earth magnets or other products, supply concentration creates risks. Price volatility, export restrictions, or geopolitical tensions could disrupt supply. Diversified supply sources provide resilience, which customers increasingly value.

Commercialisation Path

CSIRO is licensing the technology to industrial partners for commercial development. Several mining companies with Australian rare earth deposits have expressed interest. The next steps involve pilot plant construction and demonstration at scale sufficient to attract project financing.

Realistic timelines for full-scale commercial plants are 5-7 years, accounting for pilot testing, engineering design, environmental approvals, and construction. That’s typical for mineral processing projects and reflects the substantial technical and financial risks involved.

Government support will likely be necessary. While process economics look viable, establishing new rare earth processing capability requires patient capital and willingness to accept technical risks. Commercial lenders typically don’t finance such projects without government participation.

The federal government’s Modern Manufacturing Initiative and Critical Minerals Strategy both identify rare earth processing as priorities. Concessional loans, capital grants, or purchase guarantees could support project development.

State governments may also contribute, seeing rare earth processing as employment and economic development opportunities for regions near mines. Western Australia and New South Wales have both shown interest in supporting rare earth industry development.

Environmental and Regulatory Considerations

Processing rare earth elements requires chemical handling and waste management infrastructure. While the CSIRO process reduces environmental impacts compared to alternatives, it still generates waste streams needing proper disposal.

Radioactive waste handling is particularly sensitive in Australia, where there’s limited infrastructure for storing such materials and public concern about radioactive waste. The CSIRO process’s ability to concentrate radioactive contaminants in small volumes helps, but disposal still requires regulatory approval.

Water use is another consideration. Most Australian rare earth deposits are in arid or semi-arid regions where water is scarce. Processing plants need substantial water supplies, creating competition with agriculture and other uses. Water recycling and minimisation become important.

Air emissions, energy consumption, and chemical handling all require regulatory approval under environmental protection laws. The approval process for major processing plants typically takes 1-2 years and involves extensive environmental impact assessment.

Community acceptance matters too. Mining and processing projects face increasing scrutiny from local communities concerned about environmental impacts and benefits distribution. Companies need social license to operate, requiring transparent engagement and benefit-sharing arrangements.

Strategic Implications

Establishing Australian rare earth processing capability would provide supply chain security for domestic manufacturing and create export opportunities to countries wanting non-Chinese rare earth sources.

Defence applications of rare earth elements make supply security strategically significant. Guidance systems, communications equipment, and various defence electronics use rare earths. Secure supply of these materials is a defence capability issue.

There’s also potential for Australia to become a rare earth processing hub for the region, processing ores from nearby countries lacking processing expertise. Indonesia, Vietnam, and other countries have rare earth deposits that could supply Australian processors.

Technology leadership in rare earth processing could generate export revenue through licensing intellectual property to overseas operations. If the CSIRO process proves successful, other countries may license it for their rare earth projects.

However, these strategic benefits only materialise if commercial rare earth processing actually develops. Previous Australian rare earth projects failed to achieve commercial success. The CSIRO technology improves prospects, but substantial challenges remain.

For organisations monitoring rare earth supply chains, Australian processing development represents a potential source of supply diversification. The timeline is measured in years, but the direction is clear. Whether it succeeds depends on technology validation, economics, policy support, and market development. The foundational research is complete; commercialisation challenges lie ahead.