Effects of High Proportion Unground Sea Sand Ore on the Preparation Process and Reduction Performance of Oxidized Pellets
| Autor: | Zhenxing Xing, He Yang, Xiangxin Xue, Gongjin Cheng |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Blast furnace
lcsh:QE351-399.2 Materials science 010504 meteorology & atmospheric sciences vanadia–titania magnetite 0211 other engineering and technologies Pellets 02 engineering and technology Raw material 01 natural sciences oxidized pellets chemistry.chemical_compound reduction performance Chemical composition 021102 mining & metallurgy 0105 earth and related environmental sciences Magnetite lcsh:Mineralogy Metallurgy sea sand ore Geology Geotechnical Engineering and Engineering Geology Pelletizing compressive strength Compressive strength chemistry Erosion |
| Zdroj: | Minerals Volume 11 Issue 1 Minerals, Vol 11, Iss 87, p 87 (2021) |
| ISSN: | 2075-163X |
| DOI: | 10.3390/min11010087 |
| Popis: | The New Zealand sea sand ore is a kind of vanadia&ndash titania magnetite formed by erosion in the coastal zone. Because of its coarse particle size, smooth spherical particles, complex chemical composition, it has been added to sinter as an auxiliary material. Based on the principle of optimizing ore blending to strengthen advantages and weaken disadvantages, this paper used New Zealand sea sand raw ore that has not undergone any pretreatment as the main material and prepared it into oxidized pellets using a disc pelletizer and explored the influence of high-proportion unground sea sand ore on the preparation process and reduction performance of oxidized pellets. The influence of unground sea sand ore on the falling strength, compressive strength, reduction swelling index, and reduction degree of pellets was analyzed by the ICPAES, XRF, XRD, SEM-EDS, and other detection methods, and the change laws and influencing factors of oxidized pellets were analyzed. With the increase of the amount of unground sea sand ore used, the falling strength and compressive strength of the green pellets first decreased and then gradually increased, while the compressive strength of the oxidized pellets first increased and then decreased. At the same time, as the amount of sea sand ore used increased, the reduction process of pellets was restricted. The reduction swelling index and the reduction degree index generally show a downward trend. However, the compressive strength of the pellets gradually increased after reduction. Through the research on the pellet-forming performance and reduction properties of unground sea sand ore, it is shown that when the amount of unground sea sand ore used was 40%, it can still be used as raw material for blast furnace ironmaking. Thus, this research provided specific data support for iron and steel enterprises to improve the ratio of unground sea sand ore and reduce production cost. |
| Databáze: | OpenAIRE |
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