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Boliden Rönnskär

A world leader in recycling electronics

Rönnskär in Skelleftehamn is one of the world's most efficient copper smelters. The plant receives deliveries of copper and lead concentrates from our own mines and from external suppliers. Today the smelter is a world leader in electronics recycling thanks to investments and developments in Kaldo technology. We extract primarily copper, gold and silver from these materials. Rönnskär is our biggest production unit and the biggest private employer in the region.

Rönnskär in figures

  • Established: 1930
  • Acquired: 1930
  • Operating profit : 852 SEK m (2016)
  • Average number of employees: 860

Did you know that....

65 per cent of all copper produced is used to generate and conduct electricity. The supply of copper is therefore crucial for the transition to alternative energy sources like wind, solar and hydro power, where the copper is needed in the first stage to generate electricity and in the second stage to carry the energy over long distances with low losses.

Studies show that when copper is used for the purposes of energy efficiency improvements, it can deliver CO2 reductions that counteract the emissions involved in producing the copper by a factor of 250. 

Boliden Rönnskär production, 2016

  • Copper: 207 ktonnes
  • Zinc clinker: 32 ktonnes
  • Lead: 28 ktonnes
  • Sulphuric acid: 533 ktonnes
  • Silver: 508 151 kg
  • Gold: 13,782 kg

Unique Kaldo technology

Boliden's use of Kaldo technology is unique. It was initially developed within the steel industry in the 1940s and has since been further developed by Boliden for smelting electronic scrap.

The Kaldo furnace is essentially a slightly leaning cylinder which rotates during the smelting process. The material is fed in and tapped out through the mouth of the furnace. There is no need to input any energy into the furnace: the plastic in the input raw material provides sufficient energy for the smelting process. The large amounts of energy released are recycled and converted to electricity or district heating. The smelted electronic scrap is integrated with the smelter's main copper flow for further refining and the extraction of copper, gold and silver.

Thanks to investments in new materials handling and smelting facilities in 2012, Rönnskär has today an annual capacity of 120,000 tonnes of recycled materials.


Boliden Head Office

Boliden Group
Klarabergsviadukten 90
P.O. Box 44, SE-101 20 Stockholm
Tel: + 46 8 610 15 00
Fax: + 46 8 654 80 90