Comminution and liberation response of iron ore types in a low-grade deposit
| Autor: | Gabriel K.P. Barrios, Luís Marcelo Tavares, José R.O. França, Henrique Dias Gatti Turrer |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Lithology
Mechanical Engineering QEMSCAN Metallurgy Weathering 02 engineering and technology General Chemistry 010501 environmental sciences engineering.material Geotechnical Engineering and Engineering Geology 01 natural sciences Tailings 020501 mining & metallurgy Grinding 0205 materials engineering Iron ore Control and Systems Engineering engineering Gangue Comminution Geology 0105 earth and related environmental sciences |
| Zdroj: | Minerals Engineering. 158:106590 |
| ISSN: | 0892-6875 |
| DOI: | 10.1016/j.mineng.2020.106590 |
| Popis: | Low-grade iron ore deposits in Brazil are typically represented by rocks called itabirites. These deposits contain ores with different characteristics, which present varying degrees of weathering, with direct implications in iron contents, liberation characteristics and comminution response. This work analyzes the five main ore types or lithologies contained in the Serra do Sapo deposit, as part of the Minas-Rio mining complex (near the city of Conceicao do Mato Dentro, Brazil). Besides detailed chemical and mineralogical composition, liberation characteristics of the ore types have been analyzed by scanning electron microscopy and QEMSCAN. Samples were also subjected to point-load and abrasiveness tests as well as batch grinding tests. It is evident that at coarse sizes the ore types present significantly different strengths and abrasiveness, with values decreasing, as expected, with increasing degree of weathering. However, such differences partially disappeared as comminution progressed to finer sizes. Amenability of the different ores to slimes generation also varied, with weathered ores presenting significantly higher values. Grade by size deportment results show that selected ore types offer opportunity for early gangue (silica) rejection prior to the grinding stage. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect