2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 4: Recycling & Secondary Battery
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 498 pages |
| ISBN: | 978-1-987820-06-5 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Pyrometallurgical Approaches for Metal and Material Recovery from Slags and Residues
Guozhu Ye1;1SWEREA MEFOS, Lulea, Sweden;
Type of Paper: Regular
Id Paper: 25
Topic: 5
Abstract:
The metallurgical industries produce, annually, a huge amount of by-products and residues in terms of slags, dust, sludge, mill scale etc with various valuable contents. The annual amount of generated steelmaking slags in the world alone is more than 100 million tons containing a large quantity of P, Mn and Fe. The V-content content in the Swedish LD-slag alone has a metal value of around 150 million US$. As the global raw material prices have been drastically increasing in the recent years, it is of great importance to develop economically and environmentally sustainable technologies to recover the valuables from these residues.
Swerea MEFOS has developed, in the past decades, a number of metal recovery processes. Various pyrometallurgical reactors in pilot scale were used for the development work. This includes a Universal Converter of 5 tons, a DC furnace of 3 MW and an AC furnace for 10 tons fully equipped with a complete gas cleaning system capable of treating 10000Nm3 off gas. The metallurgical residues treated included EAF dust from carbon and stainless steel making for zinc, Ni and Cr recovery, Ni-dust from FeNi-smelter, catalysts with high content of Ni, Co, Mo and V, steel slag with high content of V and many others.
This paper will shortly describe the metallurgical principle of the tested concepts and highlight some of the test results from the processes.
The pilot experiences of Swerea MEFOS have demonstrated the great flexibility and capability of the pyrometallurgical approaches for metal recovery processes. Metal recovery yield of 90-100% and thermal efficiency of up to 85% have been achieved for most of the cases.