Conference Proceedings
Iron Ore Conference Proceeding 2023
Conference Proceedings
Iron Ore Conference Proceeding 2023
Moving beyond Net Present Value project evaluation to achieve Environmental, Social and Governance goals for mine operations and The use of Zimbabwean limonite-coal composite pellet as a sustainable feed for pig iron production
The challenges facing the iron and steel industry on a global scale include depletion of resources, excessive energy consumption and CO2 emissions. The demand for iron products in Zimbabwe is increasing due to massive infrastructural development like the expansion and improvement of mines, transportation systems and water reticulation systems. In Zimbabwe, cast iron is mainly produced from recycling scrap metals. However, there is currently a shortage of scrap, which has resulted in the vandalism of state-owned properties such as bus terminals and railway wagons and lines. Nevertheless, Zimbabwe is rich in limonite ores, which are idle, and it is the aim of this research that this ore be effectively used to produce feed for the blast furnace. The Blast furnace is still the dominant route for producing cast iron where sintering and coking processes are the main routes for preparing the Blast furnace feed. Sintering limonite ore fines produce a product of poor grade because of the high value of loss on ignition that has a negative impact on Blast furnace efficiency. Furthermore, the sinter plant and the coke making plant are a source of huge environmental pollutants. Since low-grade Zimbabwean coal fines are also available in abundance, they were used in the preparation of the composite materials ensuring maximum utilisation of this resource. Results showed that the limonite ore-carbon composite pellets sample with the binary basicity ratio (CaO/SiO2) of about 0.27 and coal addition of 2.5 wt per cent achieved above the minimum physical quality requirements for pellet of drop number of at least 4, a dry compression strength greater than 2.2 kg/pellet and an indurated compression strength greater than 250 kg/pellet. Limestone was used as the binder avoiding the addition of more impurities from bentonite since the limonite ore has a high SiO2 content of about 8.78 wt per cent.
Contributor(s):
T Chisahwira, S M Masuka, S Maritsa, E K Chiwandika
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Moving beyond Net Present Value project evaluation to achieve Environmental, Social and Governance goals for mine operations and The use of Zimbabwean limonite-coal composite pellet as a sustainable feed for pig iron productionPDFThis product is exclusive to Digital library subscription
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- Published: 2023
- Pages: 12
- PDF Size: 0.746 Mb.
- Unique ID: P-03358-J7N6K7