Renascor Validates Cost Edge with HF-Free Graphite Purification Process

• HF-free purification operating costs estimated at US$459/t
• Process avoids hydrofluoric acid, reducing safety and environmental costs
• Demonstration plant commissioning underway in South Australia
• Purification cost study based on large-scale engineering data
• Supports customer qualification and strategic partnership efforts

Cost Study Highlights Competitive Operating Profile

Renascor Resources (ASX:RNU) has released a detailed cost study affirming the economic potential of its hydrofluoric acid (HF)-free purification process for producing purified spherical graphite (PSG) suitable for lithium-ion battery anodes. The study estimates operating costs at approximately US$459 per tonne (2026 dollars), reinforcing the viability of Renascor’s approach as a competitive ex-China alternative to conventional HF-based methods.

This HF-free process leverages sulfuric acid leaching combined with a low-temperature caustic bake, coupled with an integrated water treatment system enabling reagent recycling. Such design reduces reagent costs and sidesteps the extensive health, safety, and environmental management expenses typically associated with handling hydrofluoric acid.

Demonstration Plant Commissioning to Validate Process

Renascor is currently commissioning its Australian Government co-funded PSG demonstration plant in South Australia, a critical step to validate engineering and operating parameters ahead of commercial-scale development. The facility aims to generate continuous operating data on purification performance, reagent consumption, water treatment integration, process stability, and product quality.

Operating data and qualification samples from the demonstration plant will support ongoing customer qualification, offtake negotiations, and strategic investment discussions, positioning Renascor to advance its downstream PSG production ambitions. This commissioning follows the plant’s construction completion earlier in 2026 and builds on prior large-scale testwork and process optimisation.

Cost Advantages Over Western HF-Based Methods

Comparative benchmarking against Western HF-based purification methods indicates Renascor’s HF-free process offers a compelling cost advantage. Conventional HF-based purification outside China often incurs higher reagent costs and significant expenses related to handling, treatment, and disposal of hydrofluoric acid. In contrast, Renascor’s process reduces these costs through reagent recycling and simplified handling requirements.

The study’s cost breakdown reveals reagent expenses at US$121/t, energy at US$115/t, labour at US$79/t, maintenance at US$74/t, and other costs including water treatment and general administration at US$70/t, totaling US$459/t. This figure excludes costs outside the purification stage such as spheronisation and logistics.

Strategic Positioning in Battery Anode Supply Chains

Managing Director David Christensen emphasised Renascor’s strategy to leverage the scale and quality of its Siviour Graphite Deposit alongside the HF-free PSG purification process to establish an integrated Australian mine-to-PSG operation. This approach aims to provide anode manufacturers with a secure, commercially competitive, and environmentally safer source of spherical graphite.

As global battery supply chains increasingly seek competitive alternatives outside China, Renascor’s demonstration plant program is central to validating its value proposition and supporting customer engagement. The company is actively sharing operating data and product samples with prospective customers and strategic partners to facilitate qualification and offtake discussions.

Bottom Line?

Renascor’s HF-free purification cost study and demonstration plant commissioning mark pivotal steps toward establishing a competitive, safer, and potentially lower-cost battery anode material supply chain outside China.

Questions in the middle?

• How will actual operating costs from the demonstration plant compare with the study’s estimates?
• What timelines are anticipated for customer qualification and securing offtake agreements?
• Could Renascor’s HF-free process influence broader industry adoption of non-HF purification methods?