Pressure Leaching Method Speeds Up Nickel Recovery from Sulfide Ores

The global transition to electric vehicles has created unprecedented demand for nickel, a critical metal in battery production. Korean researchers have developed a faster, more efficient method to recover high-purity nickel from nickel matte sulfide ore – a breakthrough that could significantly reduce processing time and costs for battery material producers worldwide.

The Problem

Traditional atmospheric leaching processes used in nickel recovery are painfully slow. Current industry methods require 16 hours or longer just to adequately leach the ore, creating bottlenecks in production and driving up operational costs. Beyond duration, atmospheric leaching methods require expensive additives – particularly hydrogen peroxide – which further erodes economic viability.

The process is energy-intensive and inefficient. For mining and metals processors operating on thin margins, these technical limitations mean they struggle to keep pace with skyrocketing demand for EV battery-grade nickel. With electric vehicle adoption accelerating globally, supply chain constraints on nickel threaten the entire battery manufacturing ecosystem.

What This Invention Does

Korea Zinc and KEMCO propose a pressure leaching approach that fundamentally changes the chemistry and speed of nickel recovery. Instead of slowly leaching at atmospheric pressure, the method pressurizes the system to 2-10 bar while supplying oxygen directly into the leaching chamber. The process operates at temperatures between 130-180 degrees Celsius and completes in just 3-10 hours.

This pressure-driven leaching dramatically accelerates the chemical reactions that dissolve nickel from the sulfide ore, cutting processing time roughly in half compared to conventional methods. The faster leaching reduces energy consumption and eliminates or significantly reduces the need for expensive hydrogen peroxide as an oxidizing agent.

Following the rapid pressure leaching phase, the method employs a sequential two-stage solvent extraction process. The first extraction isolates certain metals into an organic phase, while the second extraction further refines the nickel product. This dual-extraction approach ensures high-purity nickel output suitable for demanding applications like EV battery manufacturing.

Key Features

Pressure Leaching Acceleration. Pressurizing the system to 2-10 bar with oxygen introduction reduces processing time from 16+ hours to 3-10 hours, dramatically improving production throughput.

Reduced Chemical Costs. By replacing hydrogen peroxide oxidation with oxygen supplied under pressure, the method significantly reduces material costs, improving the economics of nickel production.

Two-Stage Solvent Extraction. Sequential extraction stages selectively separate nickel from accompanying metals (copper, manganese, zinc, cobalt, magnesium), yielding high-purity nickel suitable for battery applications.

Valuable Metal Recovery. The extraction process isolates valuable by-products like copper, manganese, zinc, cobalt, and magnesium, which can be recovered and sold separately, improving overall economics.

Recycling Integration. Organic extractant phases and secondary nickel matte can be recycled back into the process, reducing material waste and further improving efficiency.

Flexible Operating Parameters. The method operates across a range of pressures (2-10 bar), temperatures (130-180°C), and durations (3-10 hours), allowing optimization for different ore types and desired purity levels.

Who Is Behind It?

Korea Zinc Co., Ltd. and KEMCO (Korea Environment Institute) collaborated on this process innovation. Korea Zinc is one of Asia’s largest non-ferrous metals producers with extensive expertise in nickel processing. The invention was developed by Choi Heon Sik and Lee Je Joong. The company filed priority applications in South Korea on 30 August 2024 and 5 March 2025 before seeking Australian protection, demonstrating strong confidence in the commercial value of this process improvement.

Why It Matters

This invention addresses a critical bottleneck in the electric vehicle supply chain. As global EV adoption accelerates, battery manufacturers desperately need reliable sources of high-purity nickel. Any process improvement that increases nickel production speed or reduces costs gains significant commercial advantage.

The patent covers metallurgical recovery processes (IPC codes C22B 23/00, C22B 7/00, C22B 3/06), reflecting the fundamental importance of this technology in metals processing. Improved efficiency in nickel recovery reduces production costs, enabling battery makers to lower prices and accelerate EV market adoption. From a sustainability perspective, shorter processing times mean reduced energy consumption and lower environmental impact per kilogram of recovered nickel. For mining operations, implementing this pressure leaching approach could represent a substantial competitive advantage in the increasingly critical battery materials market.

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AU 2025234144 was published in the Australian Official Journal of Patents on 19 March 2026 and is open for public inspection. Patent applications represent inventions that are sought to be protected and do not necessarily reflect commercially available products.

Related Concepts

Pressure leaching is a form of hydrometallurgy that uses elevated pressures and temperatures to accelerate the dissolution of metals from ores. By operating in sealed autoclaves with injected oxygen, the process dramatically increases reaction rates compared to conventional atmospheric methods.

The technique is especially valuable for recovering nickel and other battery-critical metals from sulfide ores, where subsequent solvent extraction stages further purify the metal to the high grades required for electric vehicle batteries.