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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 6    December 2008

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Two-stage precipitation process of iron and arsenic from acid leaching solutions
N. J. BOLIN, J. E. SUNDKVIST

Boliden Mineral AB, SE-936 81 Boliden, SWEDEN

Abstract:A leaching process for base metals recovery often generates considerable amounts of impurities such as iron and arsenic into the solution. It is a challenge to separate the non-valuable metals into manageable and stable waste products for final disposal, without loosing the valuable constituents. Boliden Mineral AB has patented a two-stage precipitation process that gives a very clean iron-arsenic precipitate by a minimum of coprecipitation of base metals. The obtained product shows to have good sedimentation and filtration properties, which makes it easy to recover the iron-arsenic depleted solution by filtration and washing of the precipitate. Continuos bench scale tests have been done, showing the excellent results achieved by the two-stage precipitation process.

 

Key words: leaching; bioleaching; precipitation; iron removal

ISSN 1672-7029
CN 43-1423/U

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