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Contenu archivé le 2022-12-27

RECOVERY OF ZINC FROM SLAG USING PLASMA ARC FUMING

Objectif

The aim of this project is to demonstrate the recovery of zinc, lead and other valuable metals from zinc-lead blast furnace slags using less energy than that needed to extract them from their conventional raw materials. This will be achieved by fitting a plasma torch to an extended section of the blast furnace forehearth. A carbonaceous reducing agent will be added to the electrically heated slag to reduce the zinc and lead oxides to produce metals which will evaporate to form vapours that will then be condensed to liquid metal.

The project involves modifying a zinc-lead blast furnace by building a transferred arc plasma torch into the totally enclosed blast furnace fore hearth. An electric arc is struck between the plama torch electrode and the slag stream. The majority of the arc energy is liberated at the arc-slag terminus producing a temperature of around 1450 deg c. A carbonaceous reducant such as coke breeze is added to the slag to reduce the zinc oxide to metallic zinc vapour. This vapour is condensed from the exhaust gases in a zinc splash condenser.
The slag from a zinc-lead blast furnace typically contains 7 - 10% zinc oxide. The process described should reduce this to approximately 2%. This could be further reduced by raising the temperature and bubbling an inert gas through the slag.
Programme schedule extended until 28/02/91. Modifications in the programme were made concerning the plasma power source and associated cabling, as well as the form of the product which will be zinc metal for whichthere is a potential market available.

Appel à propositions

Data not available

Régime de financement

DEM - Demonstration contracts

Coordinateur

Tetronics Research and Development Company Ltd
Contribution de l’UE
Aucune donnée
Adresse
5b Lechlade Road
SN7 9AJ Faringdon
Royaume-Uni

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Coût total
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