Slag/Metal Separation from H&lt;sub&gt;2&lt;/sub&gt;-Reduced High Phosphorus Oolitic Hematite

Zhao, Dong Nan; Li, Guangqiang; Wang, Henghui; Ma, Jianghua

doi:10.2355/isijinternational.isijint-2017-304

Cited by 10 publications

(5 citation statements)

References 23 publications

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“…This indicates that F − can easily replace the position of O 2 − , and an O 2 − ion tends to replace two F − ions to maintain local electrical neutrality. 17,18) As a result, F − can break the TTM network and reduce the stability of the lattice structure, thus accelerating the reduction process. Therefore, the induced structural changes facilitated the reduction of the TTM, and also can decrease the melting point, which will be beneficial to the growth of metallic iron grains.…”

Section: Effect Of Caf 2 Dosagementioning

confidence: 99%

Extraction of Iron from Refractory Titanomagnetite by Reduction Roasting and Magnetic Separation

2021

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The abundant refractory titanomagnetite (TTM) provides a cheap alternative source of iron, but this ore contains impurities and is difficult to process to make suitable concentrates for the blast furnace. In this study, reduction roasting of a primary TTM concentrate followed by magnetic separation was investigated to understand the effects of reduction time, coal dosage, and CaF 2 addition on the reduction behavior of TTM and growth mechanism of iron particles. The phase composition of reduced samples was characterized by X-ray diffraction. The size distribution of iron particles was quantitatively examined using image analysis. Results showed that CaF 2 can help improve the reduction degree and particle size of metallic iron. The metallization degree increased from 85.5% to 89.5% when the CaF 2 dosage increased from 0% to 4%, while a minor increase was observed when the CaF 2 dosage exceeded 4%. Accordingly, the TTM samples were treated by reduction roasting with 4% CaF 2 and 25% coal at 1 200°C for 60 min followed by magnetic separation. A magnetic concentrate with an iron content of 91.1% and a recovery of 92.9% was achieved. In addition, the relationship between the size distributions of iron particles and grinding fineness was also studied. The size distribution using data from the diameter of iron particles was found to be close to the actual grinding fineness.

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Section: Effect Of Caf 2 Dosagementioning

confidence: 99%

Extraction of Iron from Refractory Titanomagnetite by Reduction Roasting and Magnetic Separation

2021

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“…Increased dosage of the collector during a flotation process can improve recovery, but excessive dosage can easily target other minerals and affect the grade of the concentrate [16][17][18][19]. Appropriate collector dosage is not only beneficial to improving the flotation index, but also plays a key role in the regulation of operating costs.…”

Section: Effect Of Collector Dosagementioning

confidence: 99%

Increasing Iron and Reducing Phosphorus Grades of Magnetic-Roasted High-Phosphorus Oolitic Iron Ore by Low-Intensity Magnetic Separation–Reverse Flotation

Xiao

Zhou

2019

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High-phosphorus oolitic iron ore, treated by suspended flash magnetic roasting, contained 42.73% iron (mainly present as magnetite) and 0.93% phosphorus (present as collophane). Low-intensity magnetic separation (LIMS) was combined with reverse flotation to increase the iron and reduce the phosphorus contents of the roasted product. The results showed that an optimized iron ore concentrate with an iron grade of 67.54%, phosphorus content of 0.11%, and iron recovery of 78.99% were obtained under LIMS conditions that employed a grind of 95% −0.038 mm and a magnetic field of 0.10 T. Optimized rougher reverse-flotation conditions used a pulp pH of 9 and dosages of toluenesulfonamide, starch, and pine alcohol oil of 800 g/t, 1000 g/t, and 40 g/t, respectively; optimized scavenging conditions used a pulp pH of 9 and dosages of toluenesulfonamide, starch, and pine alcohol oil of 400 g/t, 500 g/t, and 20 g/t, respectively. Study of the mechanism of phosphorus reduction showed that the toluenesulfonamide could be adsorbed on the surface of quartz after the action of starch, but adsorption was significantly weakened. The starch inhibitor negatively affected adsorption on quartz, but positively influenced adsorption of phosphorus minerals.

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“…Some of the unreduced phosphorus and iron to form Fe-P-O phase exist in the gray phase. 23) EDS analysis revealed that Ca-Si-Al gangue is determined as CaAl 2 Si 2 O 8 . The metling point of the newly generated gangue phase was low; hence, a liquid phase is formed, which improves the mass transfer conditions of the system, and the unreacted graphite particles traction to the fluorapatite surface to increase the contact area of graphite and fluorapatite to facilitate easy reduction.…”

Section: Effect Of Gangue Oxides On the Evolution Of Phos-mentioning

confidence: 99%

Gasification and Migration of Phosphorus from High-phosphorus Iron Ore during Carbothermal Reduction

et al. 2018

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Slag/Metal Separation from H<sub>2</sub>-Reduced High Phosphorus Oolitic Hematite

Cited by 10 publications

References 23 publications

Extraction of Iron from Refractory Titanomagnetite by Reduction Roasting and Magnetic Separation

Extraction of Iron from Refractory Titanomagnetite by Reduction Roasting and Magnetic Separation

Increasing Iron and Reducing Phosphorus Grades of Magnetic-Roasted High-Phosphorus Oolitic Iron Ore by Low-Intensity Magnetic Separation–Reverse Flotation

Gasification and Migration of Phosphorus from High-phosphorus Iron Ore during Carbothermal Reduction

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