Indonesia now processes more than 65% of the world’s mined nickel, and almost none of that volume leaves the country as raw ore. Since Jakarta’s 2020 export ban forced miners to build downstream capacity, the real chokepoint in the nickel supply chain has shifted from the pit to the plant. This list ranks the top 10 nickel smelters and refineries actually converting laterite ore into the intermediates that feed stainless steel mills and EV battery lines, drawing on the mining base covered in our Top 10 Nickel Producing Countries ranking.
How We Ranked the Top 10 Nickel Smelters and Refineries
Entries are ranked by processing scale, technology significance, and depth of vertical integration into the surrounding industrial park or mine complex, rather than by ore grade alone. We separate the list into the two dominant conversion routes: High-Pressure Acid Leaching (HPAL), which processes low-grade limonite into Mixed Hydroxide Precipitate (MHP) for battery supply chains, and Rotary Kiln-Electric Furnace (RKEF), which processes higher-grade saprolite into Nickel Pig Iron (NPI), ferronickel, or matte for stainless steel. Facilities are drawn from confirmed industrial park operators and joint venture disclosures, cross-checked against the USGS National Minerals Information Center; throughput figures for individual plants remain commercially sensitive and are flagged as estimated where an exact tonnage could not be independently confirmed.
1. PT Halmahera Persada Lygend (HPAL) — Indonesia
Operated through a partnership between Harita Nickel and Ningbo Lygend Mining, this North Maluku facility was one of the first laterite HPAL plants to reach commercial scale in Indonesia and has continued expanding capacity through 2025 and 2026. It converts low-grade limonite ore into MHP at a cost base that has become the industry benchmark for battery-grade nickel intermediates, feeding directly into the pricing dynamics tracked on our nickel price page. [VERIFY current MHP output tonnage — flagged as estimated in source research]
2. Weda Bay / Huafei Cobalt-Nickel Complex (HPAL) — Indonesia
Sitting inside the Indonesia Weda Bay Industrial Park (IWIP), the Huafei HPAL plant is a joint development between Huayou Cobalt and Tsingshan Holding Group. It draws ore from what several industry sources describe as the largest single nickel deposit globally, and has ramped through multiple production phases since coming online. The site produces MHP feedstock for downstream battery precursor manufacturing within the same industrial park.
3. Huayue Nickel-Cobalt (HPAL) — Indonesia
Located at the Indonesia Morowali Industrial Park (IMIP), this facility is a three-way joint venture between Huayou Cobalt, Tsingshan, and Nickel Industries Limited, one of the miners featured in our Top 10 Nickel Mining Companies ranking. Four large-scale autoclaves give it substantial battery-grade intermediate output, and its position inside IMIP means ore, power, and downstream processing are all co-located rather than shipped between sites.
4. Ambatovy Complex (HPAL) — Madagascar
Operated by Sumitomo Corporation, Ambatovy is the only facility on this list outside Southeast Asia and remains one of the largest integrated laterite-to-cathode HPAL operations in the world. A 185km slurry pipeline carries ore from the mine to the processing plant near Toamasina, an unusual infrastructure solution that reflects Madagascar’s more limited industrial logistics compared with Indonesia’s clustered parks. The project has faced historic engineering and ramp-up challenges relative to newer Indonesian HPAL plants.
5. Coral Bay and Taganito HPAL (HPAL) — Philippines
Jointly run by Sumitomo Metal Mining and Nickel Asia Corp, these two plants proved laterite HPAL could be commercialised at scale years before the Indonesian HPAL boom took off. They continue processing Philippine limonite into high-grade nickel-cobalt intermediates, giving the Philippines a smaller but established position in the battery supply chain alongside its role as a raw ore exporter to China.
6. Tsingshan IMIP Smelters (RKEF) — Indonesia
The Morowali Industrial Park hosts the world’s largest concentration of RKEF lines, all under Tsingshan Holding Group. This cluster fundamentally reshaped global stainless steel supply chains by achieving extreme vertical integration from ore to finished NPI within a single site, and remains the reference point for RKEF-based nickel processing at industrial scale. The Nickel Institute tracks RKEF capacity growth as part of its broader industry data.
7. Tsingshan IWIP Smelters (RKEF) — Indonesia
Fed directly by the Weda Bay deposit, Tsingshan’s IWIP smelter complex operates dozens of RKEF lines producing NPI, with a portion converted into higher-grade nickel matte. The joint presence of RKEF and HPAL routes within the same IWIP park (see entry 2) illustrates how Indonesian industrial parks now serve both the stainless steel and battery markets from one location.
8. Jinchuan Group Smelter Complex (RKEF) — China
Based in Gansu province, Jinchuan is China’s flagship domestic nickel smelting operation. Historically built around sulphide ore processing, the complex has modernised its flash smelting and RKEF capacity to handle imported laterite blends alongside domestic feedstock, keeping it central to China’s downstream nickel supply even as Indonesia has captured most new mining investment.
9. PT Vale Indonesia Sorowako (RKEF) — Indonesia
Operated by Vale Indonesia and Mind ID, Sorowako has run for decades and stands apart from most RKEF operations by producing high-grade nickel matte directly rather than standard ferronickel. This gives its output a more direct route into battery precursor supply chains than typical NPI, despite being built on RKEF pyrometallurgy rather than HPAL.
10. Angel and Oracle Nickel Projects (RKEF) — Indonesia
Operated by Nickel Industries Limited, these newer RKEF developments span four lines each across the IMIP and IWIP complexes. Their design allows output to pivot between NPI and matte depending on relative market pricing, representing the newest generation of RKEF capacity built with more flexibility than the first wave of Indonesian smelters.
| Facility | Country | Route | Key Operators |
|---|---|---|---|
| PT Halmahera Persada Lygend | Indonesia | HPAL | Harita Nickel, Ningbo Lygend |
| Weda Bay / Huafei | Indonesia | HPAL | Huayou Cobalt, Tsingshan |
| Huayue Nickel-Cobalt | Indonesia | HPAL | Huayou Cobalt, Tsingshan, Nickel Industries |
| Ambatovy Complex | Madagascar | HPAL | Sumitomo Corporation |
| Coral Bay / Taganito HPAL | Philippines | HPAL | Sumitomo Metal Mining, Nickel Asia Corp |
| Tsingshan IMIP Smelters | Indonesia | RKEF | Tsingshan Holding Group |
| Tsingshan IWIP Smelters | Indonesia | RKEF | Tsingshan, Eramet |
| Jinchuan Group Smelter Complex | China | RKEF | Jinchuan Group |
| PT Vale Indonesia Sorowako | Indonesia | RKEF | Vale Indonesia, Mind ID |
| Angel / Oracle Nickel Projects | Indonesia | RKEF | Nickel Industries Limited |
The Outlook for Nickel Smelters in 2026
The split between HPAL and RKEF capacity is becoming the defining fault line in nickel markets, not geography. Battery demand keeps pulling investment toward HPAL’s MHP output, while stainless steel demand keeps RKEF lines running at volume, and several of the facilities on this list, particularly those inside IWIP and IMIP, now run both routes side by side so operators can shift output toward whichever market is paying more. Expect further RKEF-to-HPAL conversion announcements from Indonesian operators through the rest of 2026 as battery offtake agreements continue to outbid stainless steel buyers for laterite feedstock.
Which is the largest nickel smelter or refinery in the world?
The Weda Bay / Huafei HPAL complex and the Tsingshan IWIP RKEF smelters, both inside Indonesia’s Weda Bay Industrial Park, are widely regarded as the largest by combined processing scale, drawing on what is described as the world’s largest single nickel deposit.
What is the difference between HPAL and RKEF nickel processing?
HPAL (High-Pressure Acid Leaching) processes low-grade limonite ore into Mixed Hydroxide Precipitate for battery supply chains, while RKEF (Rotary Kiln-Electric Furnace) processes higher-grade saprolite ore into Nickel Pig Iron, ferronickel, or matte mainly for stainless steel.
Why does Indonesia dominate global nickel smelting?
Indonesia’s 2020 export ban on raw nickel ore forced international miners to build in-country processing capacity, concentrating both HPAL and RKEF facilities inside industrial parks like IMIP and IWIP rather than allowing ore to be shipped abroad for processing.
Does China still play a role in nickel smelting?
Yes. The Jinchuan Group Smelter Complex in Gansu remains China’s flagship domestic nickel smelter, though most new global nickel processing investment has shifted to Indonesian RKEF and HPAL facilities over the past decade.
Are nickel smelters shifting from stainless steel toward battery production?
Several of the largest Indonesian complexes now operate both RKEF and HPAL lines within the same industrial park, allowing operators to direct output toward whichever end market, stainless steel or EV batteries, offers stronger returns at a given time.
