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The weak magnetic-strong magnetic separation method is mostly used for the treatment of magnetite-hematite mixed ore. After the weak magnetic separation tailings are concentrated, strong magnetic roughing and sweeping are carried out, and the strong magnetic rough concentrate is concentrated and selected by a strong magnetic …
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Thermal Growth and Magnetic Separation Filipe Rodriques, Christopher A. Pickles *, John Peacey, Richard Elliott and John Forster ... becoming more difficult to access. In comparison to sulphide ores, where the nickel-containing ... recrystallized hematite, which was less susceptible to reduction and this resulted in reduced
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(2) – (3) were very close, making it difficult to accurately control the oxidation conditions in practical operation. Magnetite was easily oxidized to weakly magnetic hematite, which was unfavorable for magnetic separation. Besides, the ΔG θ of Eq. (6) was higher than 0 when the temperature was below 600 °C, suggesting that the ...
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Using the process of suspension magnetization roasting followed by magnetic separation and flotation to treat high-phosphorus iron ore, ... The chlorite was found to be associated with hematite in the form of oolite, making it difficult to separate from the hematite. Additionally, phosphorus was primarily combined with calcium, occurring as ...
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Generally, the most commonly used beneficiation process for iron ore is magnetic separation (Li et al., 2019b) However, it is difficult to separate the hematite from the quartz by magnetic separation due to its weak magnetism (Liu al., 2010). At present, reverse flotation is the most common separation method for hematite (Wang …
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Unfavorable factors affecting beneficiation of low-grade magnetite–hematite ores, including oxidized ferruginous quartzite, are widespread development of complex intergrowths of magnetite and hematite, making it difficult to separate these minerals; development of a marked proportion of dispersed hematite and fine hematite in quartz, …
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Magnetic separation, mainly high-gradient magnetic separation, can remove harmful impurities to improve the quality of concentration. High-gradient magnetic separation can effectively treat steel plant wastewater, recovering magnetic iron, and domestic sewage, removing all kinds of harmful bacteria and suspended solids.
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Deep dephosphorization of high‑phosphorus oolitic iron ore (HPOIO) is extremely difficult because of its refractory characteristics. A new approach for simultaneous iron recovery and dephosphorization from HPOIO by oxidation roasting–gas-based reduction (ORGR) and magnetic separation process was developed.The …
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In the present work, magnetic separation of weakly magnetic mineral fines as hydrophobic flocs at a middle field intensity was studied in order to find a substitution for high-intensity or high-gradient magnetic separations to treat weakly magnetic ores in …
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The process of simultaneously roasting and magnetic separation was developed to treat the low grade siderite and hematite ores without adding any reductant. Effect of mass ratio of S-to-H (siderite ore to hematite ore) on the separation indexes of iron concentrate was discussed.
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The separation of fine pyrite from coal is difficult by conventional magnetic separation methods. The performance of magnetic separation in removing mineral pyrite from coal can be improved by increasing the magnetic susceptibility of pyrite. Several studies have shown that magnetic susceptibility of pyrite can be enhanced by …
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In this work, fine magnetite was used as a magnetic seed to enhance the separation efficiency of fine hematite from quartz during reverse micro-flotation. Gradual increases in hematite recovery and iron grade were accomplished with increasing magnetite content, whereas the iron content in quartz reject decreased.
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Selective enrichment of iron particles from complex refractory hematite-goethite ore by coal-based reduction and magnetic separation. ... gravity separation and magnetic separation was used to treat this kind of iron ore in the United States, but there was no major breakthrough in the separation results. ... difficult dehydration of …
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The high-phosphorus content and unique structure of the oolitic hematite ore make it difficult to be beneficiated. The process of direct reduction followed by magnetic separation has significance to the utilization of oolitic hematite ore, and sodium salts can improve the dephosphorization.
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Hematite is a weakly magnetic oxide mineral that is commonly associated with gangue minerals, such as quartz and aluminosilicate. High-intensity magnetic or roasting-magnetic separation processes and flotation are commonly used to …
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X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy analyses indicated that the iron mineral phase was selectively transformed from weakly magnetic hematite into strongly magnetic magnetite and that the iron mineral was effectively recycled from the roasted samples via magnetic separation.
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Apart from Fe content and Fe recovery, the contents of Zn and Pb in concentrates should be taken into consideration in the treatment of Zn- and Pb-bearing refractory iron ore through reduction roasting-magnetic separation. Hematite in the iron ore was reduced to magnetite through magnetic roasting at 800 °C for 60 min, and iron …
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In this study, the method of magnetic reduction roasting was used to convert the hexagonal vanadium hematite in the titanium-vanadium hematite (which contained ilmenite and hematite) into equiaxed vanadium magnetite and obtain a vanadium-containing iron concentrate and a titanium concentrate through low-intensity magnetic …
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Deep dephosphorization of high‑phosphorus oolitic iron ore (HPOIO) is extremely difficult because of its refractory characteristics. A new approach for simultaneous iron recovery and dephosphorization from HPOIO by oxidation roasting –gas-based reduction (ORGR) and magnetic separation process was developed. The …
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These are the three main process parameters which results in the selectivity of the paramagnetic minerals in dry high intensity induced roll magnetic separation. Most of the paramagnetic minerals including hematite respond to the magnetic separation at the field intensity of higher than 0.5 T.
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Clearly, dehydroxylation alone is not effective for magnetic separation since the recovery of Fe is low as is the removal of impurities. Reduction roasting converts goethite to hematite and maghemite and increases the efficiency of magnetic separation, leading to higher Fe recovery and improved removal of impurities.
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