2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 1: Mining
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 424 pages |
| ISBN: | 978-1-987820-03-4 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Evaluation of energy efficiency heating and grind of Iron ore using energy microwave
Leonardo Martins da Silva1;1UNIVERSIDADE FEDERAL FLUMINENSE, Volta Redonda, Brazil;
Type of Paper: Regular
Id Paper: 83
Topic: 1
Abstract:
The operation of fragmentation, in the field of mineral processing, usually applies mechanical energy through milling processes. The energy consumption in this stage is important to create a parameter to the viability of the iron ore processing in order to produce fines with high iron ore grade and small impurities, such as phosphorous, silica and alumina. Thus, an alternative to enhance the energy efficiency of the comminution stage is to perform a pre-treatment of the body ore using a rapid temperature change caused by microwave energy and cooling at room temperature.
In this context, the present work aims to study the effectiveness of heating and cooling rates of iron ore using microwave energy to heat up and its subsequent cooling in a short period (thermal shock). The study was carried out using X-ray diffraction analysis coupled with the Rietveld method to evaluate the mineralogical composition of the iron ore samples before and after the thermal shock.
Afterwards, the microscopy analysis was carried out to identify structural changes of the fissures in the samples to clarify the mechanism of the enhancement of milling. The work index (WI) measured in the milling process was used to demonstrate the efficiency of the processing route and the effect on the total energy consumption. The scanning electron microscopy (SEM) was used to analyze the structure of ore and the volume fraction of the fissures formed after heating and cooling with several rates.
In this study, it was concluded that it is possible to economically treat the iron ore to improve the grindability with a smaller amount of energy compared to the traditional route.