Floatability studies of wavellite and preliminary results on phosphorus removal from a Brazilian iron ore by froth flotation

Nunes, Aline Pereira Leite; Pinto, Clàudio; Valadão, George Eduardo Sales; Viana, Paulo Roberto de Magalhães

doi:10.1016/j.mineng.2012.06.004

Cited by 57 publications

(17 citation statements)

References 12 publications

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“…It was observed that ether diamine was more effective in the flotation of medium and coarse quartz, while ether monoamine performed better in the case of fine fraction [69]. On the other hand, the above cationic collectors were used for the dephosphorization of an iron ore. Flotigam EDA at a dosage of 150 g/t led to a 0.201% phosphorus concentrate and mass recovery of 62.31%, while the use of Flotigam 2835-2L presented a phosphorous content of 0.31% and mass recovery of 90.24% [70].…”

Section: Mineral To Be Depressed Name Of Depressant Referencesmentioning

confidence: 96%

Review on Beneficiation Techniques and Reagents Used for Phosphate Ores

2019

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Phosphate ore is an important raw material for manufacturing fertilizers and phosphorous chemical products. While most of the phosphate resources cannot be directly treated as feed stock due to the low grade of P2O5 and high content of impurities. In order to obtain a qualified phosphate concentrate, the beneficiation of the low-grade phosphate ore is, hence, of great necessity. Many beneficiation techniques can be employed to upgrade the P2O5 grade of phosphate ores based on their characteristics in chemical composition and texture. The flotation process is most widely applied to balance the P2O5 recovery ratio and cost. In this review, the dominant techniques for the beneficiation of phosphate ores are introduced. Moreover, the factors that affect the flotation of phosphate ore, including the properties of mineralogy, flotation reagents (depressants and collectors) and flotation medium, were systematically analyzed.

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Section: Mineral To Be Depressed Name Of Depressant Referencesmentioning

confidence: 96%

Review on Beneficiation Techniques and Reagents Used for Phosphate Ores

2019

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“…There are many citations in literature on the reduction of phosphorus in iron ore through anionic flotation, using a fatty acid as collector and sodium silicate as a depressant of iron oxides, when the mainphosphorus-bearing mineral is apatite (Ranjbar, 2002;Siirak and Hancock, 1990;Pyatt, 1990 …”

Section: Flotationmentioning

confidence: 99%

Processes for phosphorus removal from iron ore - a review

Pereira

Papini

2015

Rem: Rev. Esc. Minas

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This paper aims at reviewing literature on the occurrence of phosphorus in iron ores from the mines around the world. The review extends to the phosphorus removal processes of this mineral to meet the specifications of the steel industry. Phosphorus is a contaminant that can be hard to remove, especially when one does not know its mode of occurrence in the ores. Phosphorus can be removed from iron ore by very different routes of treatment. The genesis of the reserve, the mineralogy, the cost and sustainability define the technology to be applied. The articles surveyed cite removal by physical processes (flotation and selective agglomeration), chemical (leaching), thermal and bioleaching processes. Removal results of above 90% and less than 0.05% residual phosphorus are noticed, which is the maximum value required in most of the products generated in the processing of iron ore.keywords: iron ore, phosphorus removal.

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“…The explored reserves of those iron ores reach 20 billion tons in China, which is characterized by complex mineral composition and ultra-fine grain size of iron minerals. It is difficult to enrich iron minerals of refractory iron ores using conventional fine grinding followed by forth flotation or magnetic separation effectively (Nunes et al, 2012;Gao et al, 2016;Zhu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Effect of particle size on reduction kinetics of hematite ore in suspension roaster

Gao¹,

An²,

Li³

et al. 2020

Physicochem. Probl. Miner. Process.

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Suspension magnetization roasting followed by magnetic separation is an innovative and effective way to recover iron from refractory iron ores, and the particle size of the ore greatly affects the roasting index. To identify the effect of particle size on the reduction kinetics for the transformation of hematite to magnetite, a high-purity hematite ore with different size fractions were isothermally reduced using a suspension roaster. The pure hematite ore was divided into-1000+500 µm,-500+150 µm,-150+74 µm,-74+37 µm and-37 µm size fractions, while the gas mixture of CO and CO2 with a volume ratio of 1:4 was used as reductant. The results showed that the most suitable mechanism function for the reduction of-37 µm size fraction hematite ore is the Avrami-Erofeev model. In the case of-500+37 µm size fraction, the reduction process can be described by first-order chemical reaction model. For-1000+500 µm size fraction, the reduction of hematite ore is restricted by the second-order chemical reaction. In addition, scanning electron microscopy (SEM) analysis results demonstrated that the transformation of hematite particles to magnetite is in accordance with the characteristics of shrinking core model. The phase transformation primarily occurs at the edge of hematite particles and then develop towards the inner side of particles. The findings of this paper provide a theoretical basis for the development and utilization of refractory hematite ore via suspension magnetization roasting technology.

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Floatability studies of wavellite and preliminary results on phosphorus removal from a Brazilian iron ore by froth flotation

Cited by 57 publications

References 12 publications

Review on Beneficiation Techniques and Reagents Used for Phosphate Ores

Review on Beneficiation Techniques and Reagents Used for Phosphate Ores

Processes for phosphorus removal from iron ore - a review

Effect of particle size on reduction kinetics of hematite ore in suspension roaster

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