Characterisation and recovery of fine materials from industrial processes
Preparation of 5 tonnes of mining waste from the copper industry for bioleaching recovery tests.
© BRGM – Anne-Gwenaëlle Guézennec
Your issues and needs
The increasing need for mineral resources (metals, industrial minerals, building materials, etc.), in a context of depleted primary deposits and the increasing complexity of exploiting them, make manufacturers increasingly dependent on their availability. At the same time, the dumping of mineral waste in landfills is increasingly regulated and costly.
However, some waste items (mining and processing residues, co-products of extractive metallurgy, recycled parts of end-of-life vehicles (ELVs), waste from electrical and electronic equipment (WEEE), etc.) are rich in mineral and metallic substances and should, in a context of a circular economy, be better characterised and treated in order to determine new ways of recovering them.
This waste contains minerals in various phases of interest, whose recovery (concentration stages) is particularly difficult. Conventional treatment techniques are increasingly less effective with fine particles (less than 100 µm), very fine particles (less than 20 µm) and ultrafine particles (less than 5 µm), and when a dry treatment process is used.
The development of innovative techniques for treating and purifying these mineral substances of interest helps to reduce the costs of landfill storage of final waste and allows them to be re-injected into industrial processes.
Our added value
BRGM researchers draw on their knowledge and skills for R&D work, particularly for:
- characterising the physical-chemistry of fine and ultrafine particles and the way they react to the various treatment processes,
- understanding and modelling phenomena at the interfaces between solid particles and solvents (water), and then applying the knowledge to the separation of fine particles.
This knowledge, combined with our researchers’ mastery of the engineering of mineralurgical processes and first-rate technical facilities, enables them to produce recoverable fractions. BRGM can contribute to the whole cycle of operations, from the characterisation of fine materials (composition, morphology, texture, mechanical strength of mineral assemblies, thermodynamics of the dilution of metals and organic compounds within complex matrices and processes, etc.) to the design and the technical, economic and environmental assessment of recycling processes.
Tests for magnetic separation of fine particles.
© BRGM – Solène Touzé
Means of analysis and platforms
- CARAMIN: Mineralogical and crystallographic characterisation
- CARAPHY: Mineral, physical-chemical and textural characterisation
- GENIE: numerical modelling of geochemistry
- IN'ORGA: organic and inorganic chemical analyses (COFRAC accreditation)
- PLAT'INN: experimental platform for the treatment of mineral materials
- Design of an experimental facility for membrane separation of nanoparticles smaller than 20 nm in size
- Flotation of fine particles to extract rare earths in phosphates from mine tailings or in luminophores
- Treatment of blast furnace sludge to extract carbon and iron and recycle them in steel-making processes
- Treatment of cathode ray tube (CRT) powders from TV screens for the recovery of heavy rare earths (Y and Eu)
- Treatment of powders from the manufacture of brake pads for the recovery of non-ferrous metals (Cu, Zn)
- Treatment of unburnt products from the pyrolysis of rubber to recover zinc and carbon
- Separation of used concrete constituents and recovery of cement paste for clinker production
- Treatment of the fine fraction of sediments polluted by metals and hydrocarbons