Webinar on Sludge and Dust (15.06.2021) Metal recovery from iron and steelmaking dust and sludge residues Dissemination of results of the European projects dealing with reuse and recycling of by - products in the Steel sector Stubbe, Gerald – VDEh Betriebsforschungsinstitut GmbH
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Webinar on Sludge and Dust (15.06.2021)
Metal recovery from iron and steelmaking dust and sludge residues
Dissemination of results of the European projects dealing with reuse and recycling of
2sDR® process scheme [PRIMETALS; EIT RawMaterials project: 2sDR]
Pyrometallurgy – two step processes
Webinar on Sludge and Dust (15.06.2021)
Ammonical leaching process [2]; e.g. SAMEX® project [EIT RawMaterials project No. 19205]
Ammonical leaching, leachate purification and electrowinning [1]; EZINEX® process [EUR 19393]
Hydrometallurgy
Similar EU
projects
(Rep.-No.)
Title Results/Success/Failures TRL Follow-up/ideas
EUR 19393
[P1]
Economic advantages of integrated
processing of steelworks EAF wastes,
mainly containing Zn, Pb, Cd, FeOx, Zn
ferrite and others, with total recovery
Effective for recycling of EAF dusts and obtaining
metallic Zn at high purity level;
Economy depends on Zn content and raw material
and energy prices
6 Integrated system for treatment
of larger quantities of dusts with
higher zinc content in order to
increase the overall yield
GA ID 508714;
REDILP [P42]
Recycling of EAF dust by an integrated
leach-grinding process
The resulting REDILP-Process works in the
technological way but not in the economic way
7 Marketing and exploiting the
developed system at EU level
Webinar on Sludge and Dust (15.06.2021)
Full-Rec technology; [EUR 20505, EUR 22989]
Combined Pyro- and Hydrometallurgy
Similar EU
projects
(Rep.-No.)
Title Results/Success/Failures TRL Follow-up/ideas
EUR 20505;
FULL-REC
[P6]
High purity zinc and ferroalloys recovery
from EAF dusts through a combined
pyro-hydrometallurgical treatment
Complete recovery of Zn and Pb is achieved
(ZnO+PbO>84%);
Very high purity (99.96%) metallic zinc product
5 Implementation of the hydro-
metallurgical plant in continuous
mode
EUR 22989;
FULL-REC 2
[P13]
Hydrometallurgical continuous treatment
of ZnO enriched powders for metal zinc
production
The feasibility has been successfully demonstrated,
but lower purity of metallic Zn product (99.98%) than
targeted due to solution impurities;
Economic operation is expected
5 Ti Anodes instead of Pb ones;
Double purifying treatment for
better Ni removal
Webinar on Sludge and Dust (15.06.2021)
Evaluation of relevant EU projects in REUSteel – Preliminary conclusion on dust and sludge processing
• All of the evaluated projects basically were successful from technical point of view – only minor technical challenges still have to be tackled
• Economic efficiency is diverse - depends on many aspects• Zn concentration in residue; Zn price
• Product quality and value: Often impurities in Zn product of one-step metallurgical processes (two steps are better); however good product quality in hydrometallurgy
• Energy and raw material costs
• Follow-up activities mainly devoted to detailed technical improvements, scale-up and marketing
[1] M. G. Maccagni: INDUTEC®/EZINEX® Integrate Process on Secondary Zinc-Bearing Materials. J. Sustain. Metall. (2016) 2:133–140
[2] N. Rodriguez Rodriguez et. al.: Selective Removal of Zinc from BOF Sludge by Leaching with Mixtures of Ammonia and Ammonium Carbonate. Journal of Sustainable Metallurgy (2020) 6:680–690