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RECYCLING OF ZINC AND LEAD CONTAINING DUSTS FROM THE ELECTRIC ARC FURNACE

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In the course of the tests, both transport and injection systems have been improved. Meanwhile, the systems work reliably. The massflow of dust is controlled, in order to maintain a maximum feeding rate of about 200 kg/min. This ensures that an amount of 2000 kg dust can be injected within the short period of 10 minutes. Problems related to the foaming slag, productivity and the quality of steel and slag products have not occurred. During the period of continuous injection tests, a higher energy consumption was not observed, although expected. The experimental phase was too short to determine the influence of a higher FeO content in the slag on the wear resistance of the refractory. Such investigations will have to be carried out in future tests.

The increase in the zinc and lead content of the new dust meets the expectations. The amount of dust to be shipped to a non-ferrous smelter is reduced. The benefits of this technique are evident: enrichment of zinc and lead in the dust, reduced amount of dust, thus less transport and processing costs. Pneumatic dust recycling has considerable positive effects on the cost reduction in EAF steel making.
The electric arc process presents itself as an optimal process for the recycling of zincic scrap. This is important, because the amount of this type of scrap will increase in the near future. The zinc and lead of this scrap can be recycled via the electric arc furnace dust. The objective of this research and development project is the production of such dust with high contents of zinc and lead. The secondary ore produced this way is a raw material which can be used in a technical and economical optimal way in the non-ferrous metal industry for the production of zinc and lead.

For the realisation of high contents of zinc and lead a portion of the dust from the electric arc furnace should be fed back and injected into the melt. Due to the thermodynamic data of zinc and lead these elements will be enrich in the dust during the dust injection interval. The other components of the recycled electric arc furnace dust (iron, chromium, and nickeloxides) will become a part of the slag or will be reduced into the melt. It is very important to solve the following questions and problems in this research and development project:

1) Influence of dust injection on the process technology of the electric arc furnace process.

2) Amount of energy used for the injection of the dust and the melting of the dust in the melt.

3) Development of a facility for the pneumatic transport of electric arc furnace dust and injection into the melt.

4) Investigation of the economical and technical optimal feed back rate of the dust.

Wissenschaftliches Gebiet

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Finanzierungsplan

CSC - Cost-sharing contracts

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Krupp Stahl AG
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Letzte Aktualisierung: 26 Februar 1993

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Permalink: https://cordis.europa.eu/project/id/BRE20116/de

European Union, 2024