Objective
Cebedeau and CRM have suggested a new way for treating zinc and lead bearing residues from blast furnaces and steel making gases dust removal. The technique proceeds by acid leaching.
The first characteristic of the process consists in using, as a leaching reagent, another residue present in integrated iron and steel production, namely the spent hydrochloric pickling baths after oxidation of FeCl2 into FeCl3. The second characteristic is to carry out a more selective solubilization of the Zn/Pb/alkali compounds in acid medium, except iron oxides by creating on the contrary, in the above-mentioned solubilization medium adequate conditions for the precipitation and consequently enrichment in iron of the residue to be recycled to the iron ore sintering plant.
This study aims at a characterization of the compounds difficult to make soluble and at a research by means of discontinuous laboratory trials of the best values for the FeCl3 leaching parameters in order to improve the extraction efficiencies of zinc and lead compounds.
At the end of the research, it appears:
- that the acid leaching process of zinc and lead bearing residues by means of ferric chloride can only be taken into account for recycling blast furnace sludges excluding steel making plant dusts which contain too much Zn ferrite, too difficult to make soluble.
- that high leaching efficiencies can be reached (90% for Zn and 88% for lead) in the case of some blast furnace sludges.
- that the opportunities for BF sludges recycling has to be scanned one by one, depending on their mineralogical structure and their intrinsic properties in order to optimize the leaching parameters.
The programme proposed is subdivided into the following phases:
1) characterization and dosage of the compounds which resisted dissolving by FeCl3 during leaching of steelmaking waste in the conditions described above;
2) bibliographical scan for the compound-dissolving methods yielded by phase 1;
3) experiments with the processes selected in phase 2 or with other original solubilization methods;
4) drawing up balance sheets on the efficiency of the processes and on consumption of reactives;
5) the results obtained must indicate which process(es) have emerged as the most promising from the previous phase;
6) drawing up of a balance sheet to quantify the reactive consumption and the cost of the treatment selected;
7) the figures of this balance sheet will serve as a data base for evaluating the cost of the treatment according to the type of waste involved and as a function of its composition.
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Programme(s)
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Coordinator
4000 Liege
Belgium
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