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REMOVAL OF ANIONIC COMPOUNDS FROM MINING WATERS

REMOVAL OF ANIONIC COMPOUNDS FROM MINING WATERS. Antti Häkkinen 1 & Mika Sillanpää 2 Lappeenranta University of Technology 1 Laboratory of Solid-Liquid Separation 2 Laboratory of Green Chemistry P.O. Box 20 53851 Lappeenranta 1 Antti.Hakkinen@lut.fi ; +358 40 354 3218

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REMOVAL OF ANIONIC COMPOUNDS FROM MINING WATERS

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  1. REMOVAL OF ANIONIC COMPOUNDS FROM MINING WATERS • Antti Häkkinen1 & Mika Sillanpää2 • Lappeenranta University of Technology • 1Laboratory of Solid-Liquid Separation • 2Laboratory of Green Chemistry • P.O. Box 20 • 53851 Lappeenranta • 1 Antti.Hakkinen@lut.fi; +358 40 354 3218 • 2 Mika.Sillanpaa@lut.fi; +358 400 205 215

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  3. LUT Chemistry WATER MINING & METALLURGY RESEARCH LABORATORIES BIOREFINING PROCESS TECHNOLOGY SEPARATION TECHNOLOGY CHEMISTRY & ANALYTICS MATERIALS PULP & PAPER APPLICATION AREAS

  4. Professors at LUT Chemistry Prof. Heli Siren Analytical methods Prof. Mika Mänttäri Membrane Technology Prof. Mika Sillanpää Green Chemistry Prof. Kaj Backfolkj Fiber and Paper Technology Prof. Marjatta Louhi-Kultanen Crystallisation Prof. Ilkka Turunen Process Intensification Prof. Andrzej Kraslawski Systems Engineering Prof. Tuomo Sainio Adsorption and Ion Exchange Prof. Eeva Jernström Process Integration Prof. Antti Häkkinen Solid-liquid Separation Prof. Tuomas Koiranen Fluid Flow Technologies

  5. Project idea: Removal of anionic compounds from mining waters • Water management issuesrelated to miningindustryhaveattracted a lot of attentionlately • environmentalconcerns • lack of rawwater • possiblerecovery of valuablesfromwastewaters • >>There is a greatneed to createtechnologiesthatwouldenable the recycling of processwaters in an efficientway • One of the mostsignificantfactorsrelated to recycling of processwaters is the behaviour and accumulation of anioniccompounds in the process • >> Efficient and economicalmethod for removing the anionsfrom the watercycle is required

  6. Electrochemical methods • Electrochemical methods, which include electrocoagulation, electro-oxidation and electroreduction, can provide alternative ways for industrial waste water treatment and these methods have attracted a lot of interest especially during the last decade. • Electrochemical methods typically require some pre-treatment of process waters as well as post-treatment for removing the fine solids: • Clarification by sedimentation, flotation, flocculation and filtration technologies or a suitable combination of these. • >> The aim of this project is to study the potential of electrochemical technologies together with traditional sedimentation, flotation and filtration techniques in the treatment of wastewaters of mining industry. • The main target is to find combined techniques which are the most suitable for removal of anions and find optimized multi stage solutions from separation to dewatering for minimizing the environmental load of waste waters.

  7. Content of the project • Treatment and purification of process waters: • Pre-treatment by traditional techniques (flotation, sedimentation, flocculation, filtration, etc.) • Electrochemical treatment for removing the dissolved anions • Post-treatment for removing the created solids • Evaluation of water balances of mining and ore enrichment operations: • Simulations and calculations based on real process data • Comparison of different alternatives for recycling of process waters (short/long cycles) • Economical analysis of different alternatives: • Different combinations of electrochemical techniques and traditional methods

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