Nickel Ni · 28

A silvery metal that resists rust, which is why it goes into stainless steel — and, more recently, into the cathodes that give an EV its range.

왜 중요한가?

Two-thirds of nickel still goes into stainless steel, but the battery share is what moved the market: raising nickel in a cathode raises the energy the cell can hold.

Where it is in the Earth

Nickel reaches minable concentrations through two quite different geological processes, which is why the deposits look nothing like each other and require very different methods to extract. The first process is magmatic: when molten rock rich in iron, magnesium and sulfur cools slowly deep in the crust, nickel tends to follow sulfur and iron into droplets of liquid sulfide that sink through the magma and pool at the base of the intrusion. When that melt eventually solidifies, the result is a sulfide ore body — rock threaded with the mineral pentlandite — carrying nickel grades that the data here put at roughly one to three percent by weight. The great sulfide camps of Sudbury in Canada and Norilsk-Talnakh in Russia formed this way, though Sudbury has the additional distinction of having been shaped or at least reprocessed by a meteorite impact, which concentrated the sulfides further.

The second process is entirely at the surface. When ancient ultramafic rocks — the same iron- and magnesium-rich rock types that host sulfide deposits — are exposed to prolonged tropical weathering over millions of years, water slowly dissolves and carries away much of the magnesium and silica. Nickel, being less mobile, is left behind and gradually enriches in the remaining clay and oxide minerals near the surface. The result is a laterite deposit: a broad, shallow blanket of reddish or greenish saprolite and limonite that can extend over a large area but carries nickel in a fundamentally different mineralogical form, mainly in the silicate garnierite or locked into iron oxide minerals. Indonesia sits on one of the world's largest accumulations of these laterised ultramafic rocks, which is why it now accounts for so large a share of world output.

The distinction between sulfide and laterite is not merely geological curiosity. Sulfide ores tend to occur at depth and in discrete bodies, making them amenable to selective underground mining and relatively straightforward concentration by flotation. Laterite ores are widespread, near-surface and fine-grained, which makes them harder to concentrate by physical means and generally requires either smelting or hydrometallurgical leaching — processes that consume considerably more energy per tonne of nickel produced. Where a deposit sits on the geological spectrum between these two end-members shapes almost every subsequent decision in the supply chain.

Getting it out

Sulfide nickel deposits are typically mined underground, because the ore bodies are narrow, steeply dipping and located at considerable depth. Miners drive tunnels to reach the ore zone and use methods such as cut-and-fill or blasthole stoping — essentially carving out large underground chambers — to extract the rock. The ore grades associated with sulfide deposits, running around one to two percent nickel, sound low, but because so much of the unwanted rock (called gangue) can be left underground or managed as tailings after milling, the economics can work well. The Norilsk-Talnakh complex in Russia and the Sudbury Basin in Canada are the canonical examples of this type.

Laterite deposits are a different matter. Because the enriched material forms a near-surface blanket, it is usually stripped by open-pit methods: overburden is removed, and the ore is excavated in horizontal benches. The Sorowako operation in Indonesia follows this pattern. The trade-off is that laterite ore is bulky and low-grade relative to the energy needed to process it, so very large volumes of material move through the system for each tonne of nickel recovered. There is no clean separation step equivalent to flotation: the nickel is dispersed through the clay and oxide minerals in a way that only heat or acid can release.

Grade matters in practice because it determines the ratio of waste to product at every stage. A mine processing ore at one percent nickel must handle a hundred tonnes of rock to obtain one tonne of contained metal, and most of those hundred tonnes must be moved, crushed, processed and disposed of. For laterite operations, the processing waste — whether slag from a smelter or tailings from a pressure-acid-leach plant — is substantial in volume and must be managed carefully to prevent environmental contamination, particularly because laterite processing often involves strong acids or high-pressure steam.

What pulls on it

Nickel's demand story has two quite separate chapters that are sometimes conflated. The older and larger chapter is stainless steel. Stainless steel is an alloy of iron, chromium and nickel in which the nickel stabilises a particular crystalline structure (the austenite phase) that gives the steel its combination of formability and corrosion resistance. Around two-thirds of all nickel consumed goes into this application, and that fraction has remained broadly stable for decades. Stainless steel production tends to follow construction activity, industrial output and consumer goods manufacturing, so nickel demand from this sector tracks general economic conditions rather than any specific technology transition.

The newer chapter is batteries. Nickel-manganese-cobalt (NMC) cathode chemistries, which dominate much of the electric vehicle market, use nickel as the primary active material. Raising the nickel share of the cathode increases the energy density — the amount of electricity the cell can store per kilogram — which in turn extends the range a vehicle can travel on a single charge. This is why battery manufacturers have progressively moved towards higher-nickel formulations. The intensity figures in the table on this page quantify what that means in practice: an NMC pack of the size typical for a mid-range electric vehicle contains between 40 and 60 kilograms of contained nickel. Multiply that by the number of vehicles being produced and the arithmetic makes clear why battery demand has become the part of the nickel market that attracts the most attention.

Beyond steel and batteries, nickel appears in superalloys used in the hot sections of aircraft engines, in alloys for nuclear steam generators, and in the electrodes of alkaline electrolysers used to produce hydrogen. These are smaller in volume than stainless steel but often require high-purity material and are less price-sensitive, so they carry disproportionate weight in discussions of supply adequacy. What would have to change for demand to shift sharply? On the battery side, a sustained move toward lithium iron phosphate (LFP) cathode chemistry — which contains no nickel at all — would reduce growth in battery demand. On the stainless side, a prolonged slowdown in global industrial output would reduce the base load. Neither of these is a certainty; they are simply the main variables that would alter the trajectory.

Turning ore into product 수준 3

The processing route for nickel diverges sharply depending on whether the feed is sulfide or laterite, and this divergence has direct consequences for what product emerges at the end and who can use it. Sulfide ores are first crushed and ground (comminution) to liberate the pentlandite grains from the surrounding silicate rock, then concentrated by froth flotation — a process in which air bubbles selectively carry sulfide minerals to the surface of an agitated slurry, leaving gangue behind. The resulting concentrate, carrying perhaps ten to thirty percent nickel alongside copper, cobalt and platinum-group elements, is then smelted to produce a matte: a molten mixture of nickel and copper sulfides from which the silica and iron have been removed as slag. Further converting oxidises away more sulfur, and the resulting high-grade matte goes to a refinery where electrolytic or chemical processes separate nickel from copper, cobalt and the platinum-group metals. The output is Class 1 nickel — metal of at least 99.8% purity — suitable for battery applications or for forming into the briquettes and rounds traded on the London Metal Exchange.

Laterite ores cannot follow this route because flotation does not work on clay-hosted or oxide-hosted nickel. Two main alternatives exist. The first is pyrometallurgical: ore is dried and smelted in an electric furnace to produce ferronickel (an iron-nickel alloy typically running around twenty to forty percent nickel) or, in a more energy-intensive reduction process, nickel pig iron — a lower-grade ferronickel developed in China and Indonesia as a cheaper feed for stainless steel. These products are Class 2 materials: useful for stainless steel production but not readily upgradeable to the purity needed for battery cathode chemistry. The second route is hydrometallurgical: ore is dissolved in hot sulfuric acid under pressure (high-pressure acid leach, or HPAL), and the resulting solution is purified through solvent extraction and precipitation to recover nickel and cobalt as mixed hydroxide precipitate or sulfate. HPAL plants are technically demanding and capital-intensive, but they produce an intermediate that can be refined to battery-grade nickel sulfate. The Indonesia Morowali Industrial Park represents the large-scale integration of these laterite smelting and refining steps within a single industrial zone.

The critical point for anyone reading the production statistics is that Class 1 and Class 2 nickel are not interchangeable in all end uses. The rapid growth of nickel pig iron and ferronickel output from Indonesia has increased the total tonnage of contained nickel produced globally, but that material flows almost entirely into stainless steel. Battery manufacturers require Class 1 material or HPAL-derived intermediates, and the capacity to produce those from laterite feedstock — while growing — has been constrained by the capital cost and technical difficulty of HPAL. Losses accumulate at several points in both routes: smelter slag retains some nickel, tailings from flotation carry some away, and each hydrometallurgical purification step involves imperfect recovery. Where the losses are highest matters for both the economics and the environmental footprint of the operation.

Substitution and recycling 수준 3

In stainless steel, the most direct substitute for nickel is manganese, sometimes combined with nitrogen, which can partially stabilise the austenite structure that nickel provides. Manganese-substituted stainless grades exist and are used where cost pressure is acute, but they sacrifice some corrosion resistance and formability compared with nickel-bearing grades, which limits their acceptance in demanding applications such as food-processing equipment, medical instruments and marine environments. Nickel can also be avoided altogether by using ferritic or martensitic stainless steels, which contain chromium but little or no nickel; these are widely used in cutlery, automotive trim and some structural applications, though again with trade-offs in toughness and weldability.

In battery cathodes, the main alternative to high-nickel NMC is lithium iron phosphate, which contains no nickel, cobalt or manganese. LFP cells have lower energy density — meaning a heavier battery for the same range — but they are less expensive per kilowatt-hour of capacity, tolerate a wider range of charging conditions, and have a longer cycle life. The balance between LFP and NMC varies significantly by geography and vehicle segment, and the competitive position of each chemistry shifts as manufacturing scale and raw material prices move. For applications where weight and volume are less constrained, LFP can serve adequately without any nickel at all.

Recycling returns nickel to the supply chain through two main streams. Stainless steel scrap is the larger: stainless production has relied on a high scrap fraction for decades, and the nickel in that scrap is largely recovered in the electric arc furnace melt. Battery recycling is younger and more complicated. The three main processes — pyrometallurgical smelting, hydrometallurgical dissolution, and direct recycling of cathode material — each recover nickel at different efficiencies and produce it in different forms. Collection rates for end-of-life batteries remain modest because the infrastructure is still being established and because many batteries currently reaching end-of-life came from early, smaller packs that are harder to process economically. As the volume of spent EV batteries grows, the economics of collection and processing will improve, but the timeline for that to represent a substantial fraction of supply depends on how quickly the vehicle fleet turns over.