Alunorte

Alunorte. It is the world's largest alumina refinery, situated in the municipality of Barcarena in the northern Brazilian state of Pará. The facility is a critical asset for the global aluminium supply chain, converting bauxite into alumina, the primary raw material for aluminium smelting. Owned and operated by the Norwegian industrial giant Norsk Hydro, its operations are deeply integrated with the nearby Albras aluminium smelter and depend on bauxite from the Mineração Rio do Norte consortium in the Amazon rainforest.

History

The refinery's development was initiated in the late 1970s through a partnership between Companhia Vale do Rio Doce (now Vale S.A.) and a consortium of Japanese companies, including Nippon Amazon Aluminium Co., Ltd.. Construction began in 1981 but was halted due to the international 1980s oil glut and economic challenges, resuming only in the early 1990s. The plant officially commenced operations in 1995 under the management of Norsk Hydro, which gradually increased its ownership stake. A significant expansion in 2006, known as the "Alunorte 2" project, doubled its production capacity, cementing its position as the global industry leader. This growth was part of a broader industrial strategy in Pará, closely linked to the development of the Albras smelter and investments in local infrastructure like the Vila do Conde Port Terminal.

Operations

The refinery processes bauxite ore extracted from the Trombetas River region by the Mineração Rio do Norte mining consortium. This raw material is transported via river barges to the plant's dedicated port facilities on the Pará River. The core process involves the Bayer process, which refines bauxite into smelter-grade alumina. The majority of its production is supplied via pipeline to the adjacent Albras aluminium smelter, a joint venture between Norsk Hydro and NAAC, for electrolysis into primary aluminium metal. Remaining alumina is exported globally through the Port of Vila do Conde, supporting aluminium smelters across Europe, North America, and Asia. The complex also includes its own thermal power station to generate necessary process energy.

Environmental impact and controversies

The operation has faced intense scrutiny and legal challenges over its environmental and social footprint in the Amazon Basin. In February 2018, following heavy rainfall, the company was accused of a major spill from its bauxite residue deposit areas, allegedly contaminating local waterways and affecting communities in Barcarena. This led to a production embargo by Brazilian federal courts and the Pará State Secretariat for Environment and Sustainability. Independent reviews, including one by the International Council on Mining and Metals, were commissioned to assess the dam structures. The incident resulted in a landmark settlement with the Federal Public Ministry and state prosecutors, requiring extensive social and environmental compensation. These events drew attention from global NGOs like Amnesty International and impacted the reputation of parent company Norsk Hydro on the Oslo Stock Exchange.

Technology and production

The facility employs advanced iterations of the Bayer process and has pioneered efforts to reduce its environmental footprint. A key technological focus has been on improving the management and filtration of bauxite residue (red mud), stored in large engineered deposit areas. The plant has implemented state-of-the-art press filter technology to significantly reduce residue moisture content, enhancing the safety and stability of its storage dams. Its production process is energy-intensive, relying on a combination of its own power generation and the regional grid. Continuous investments aim to increase energy efficiency and the potential integration of renewable energy sources, aligning with Norsk Hydro's corporate sustainability goals and reducing overall greenhouse gas emissions per ton of alumina produced.

Corporate structure and ownership

The refinery is legally constituted as Hydro Alunorte S.A., a wholly-owned subsidiary of the Norwegian multinational Norsk Hydro ASA. While Norsk Hydro holds 100% of the shares and exercises full operational control, the historical involvement of Japanese partners remains through the offtake agreements and the joint venture structure of the Albras smelter. Its corporate governance adheres to the policies and standards set by its parent company, which is publicly listed on the Oslo Stock Exchange and subject to Norwegian reporting requirements. The operation is a central pillar in Norsk Hydro's integrated aluminium value chain, which spans from bauxite mining in Brazil to recycling and rolled products in Europe and North America.

Category:Aluminium refineries Category:Companies based in Pará Category:Norsk Hydro