A Review of Flotation Separation of Mg Carbonates (Dolomite and Magnesite)

Wonyen, D.G.; Kromah, Varney; Gibson, Borbor A.K.K.; Nah, Solomon; Chelgani, S. Chehreh

doi:10.3390/min8080354

Cited by 64 publications

(31 citation statements)

References 58 publications

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“…Flotation is a separation method based on the difference of physical and chemical properties between valuable minerals and gangue minerals [4]. In the flotation process, in addition to particle size and shape [5][6][7][8][9][10][11], the wettability of mineral surface plays a decisive role in its floatability [12]. In previous studies, the contact angle between the mineral surface and the bubble is often used as an important indicator of the wettability of the mineral surface [13,14].…”

Section: Introductionmentioning

confidence: 99%

Insight into the Influence of Surface Roughness on the Wettability of Apatite and Dolomite

Wang

Zhang

2020

Minerals

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Surface roughness has an important influence on the wettability of particles. This paper is an innovative exploration to control the surface wettability of apatite and dolomite from the perspective of roughness in the background of phosphate flotation. Roughness characteristics of apatite and dolomite particles and its effects on wettability were investigated with surface roughness, contact angle measurements, and SEM analysis. The relationship between surface energy and wettability of different roughness surfaces was also discussed. The results indicated that the influence of roughness on apatite and dolomite particles showed the same regularity, and wettability increased with the increasing roughness for hydrophilic surfaces, while the wettability decreased for hydrophobic surfaces. The influence of roughness on wettability can be well explained by Wenzel and Cassie models, and the surface energy of different rough surfaces had a strong correlation with their wettability. When sodium oleate was added after acid treatment, the apatite was hydrophilic, while the dolomite was hydrophobic; the difference in wettability between them became greater as surface roughness increased. Thus, it can be predicted that the selective separation of dolomite and apatite under acid reverse flotation conditions can be strengthened by increasing the mineral surface roughness during comminution.

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Section: Introductionmentioning

confidence: 99%

Insight into the Influence of Surface Roughness on the Wettability of Apatite and Dolomite

Wang

Zhang

2020

Minerals

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“…The Resanol A100 was used as a magnesite collector provided by Ekof GmbH, Germany. Short reagent conditioning time and staged addition are applied to prevent the slime generation and reagent consumption [1], i.e., SHMP, HEDP and Resanol A100 were added in at different steps, the first addition to receive concentrates 1 and 2. Then the air supply is stoped.…”

Section: Reagentsmentioning

confidence: 99%

“…The flotation separation of magnesium-bearing carbonates (magnesite and dolomite) from non-salt type minerals (hematite, gold-bearing sulfides, and monazite) is typically less difficult as compared to their separation from other salt-type minerals [1]. However, flotation of semi-soluble salt-type minerals which contain a significant amount of (CO3) -2 along with Mg 2+ / Ca 2+ ions [2][3][4] is generally challenging.…”

Section: Introductionmentioning

confidence: 99%

“…However, flotation of semi-soluble salt-type minerals which contain a significant amount of (CO3) -2 along with Mg 2+ / Ca 2+ ions [2][3][4] is generally challenging. These dissolved ions and in consequence their solution species will also interact with various minerals changing their surface properties, which interfere with the added reagents, affecting collector-mineral interactions, consuming reagents and influencing flotation performance [1]. For instance, Ca 2+ ion can interact with (CO3) -2 to form CaCO3 and precipitate on the magnesite surface and change the magnesite's surface properties, which can then be falsely depressed.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Sodium Hexametaphosphate on the Flotation of Ultrafine Magnesite from Dolomite-rich Desliming Tailings

Hoang¹,

Ebert²,

Möckel³

et al. 2021

Preprint

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Depletion of ore deposits, increasing demand for raw materials, the need to process low-grade, complex and finely disseminated ores and the reprocessing of tailings are challenges, especially for froth flotation separation technologies. Even though capable of handling relatively fine grain sizes the flotation separation of very fine and ultrafine particles faces many problems still. Further, the flotation of low-contrast semi-soluble salt-type minerals with very similar surface properties, many complex interactions between minerals, reagents and dissolved species often result in poor selectivity. This study investigates the flotation beneficiation of ultrafine magnesite rich in dolomite from de-sliming, currently reported to the tailings. The paper especially focuses on the impact of the depressant sodium hexametaphosphate (SHMP) on: (i) the froth properties using dynamic froth analysis (DFA), (ii) the separation between magnesite and dolomite/calcite and (iii) its effect on the entrainment. Furthermore, the application of 1-hydroxyethylene-1,1-diphosphonic acid (HEDP) is a more environmentally friendly and low-cost alternative to SHMP is presented and discussed. The paper contributes to understanding on the complexity of depressant responses in froth flotation.

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“…However, the clear-cut separation of magnesite from carbonate minerals is still a technical challenge [3]. The commonly used collectors show strong collecting ability for magnesite as well as other associated carbonate minerals due to the similarity of crystal structures and physicochemical characteristics of the mineral surfaces [8][9][10]. Consequently, there is a need that has been recognized among researchers to identify more selective collectors acting on such minerals.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Cetyl Phosphate Adsorption in Flotation of Magnesite and Pertinent Chemical Aspects

et al. 2020

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Magnesite ores are important resources in the production of value-added magnesium materials. Generally, low selectivity of conventional collectors and the requirement of a large amount of depressant has been a motivation for researchers to identify alternate collectors. In this work, the role of potassium cetyl phosphate (PCP) as a new collector in magnesite flotation is investigated using molecular dynamics (MD) simulations and chemical equilibria, electrokinetics and wettability. The results indicate that PCP exhibits a strong collecting ability for magnesite particles even with low concentrations. The presence of PCP leads to significant alterations in the electric double layer and contact angle behavior of magnesite, which results in rapid adsorption of PCP on magnesite surface. The results from chemical computations show that the monoanionic forms of PCP are the dominant species in the weakly acidic pH range, where monohydroxy magnesium species and the ion concentration of magnesite in suspension can be controlled by adjusting pH. The adsorption models indicate that the stable adsorption of PCP on magnesite surfaces occurs spontaneously, supporting the potentiality for selective magnesite flotation in its separation from other carbonate minerals.

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A Review of Flotation Separation of Mg Carbonates (Dolomite and Magnesite)

Cited by 64 publications

References 58 publications

Insight into the Influence of Surface Roughness on the Wettability of Apatite and Dolomite

Insight into the Influence of Surface Roughness on the Wettability of Apatite and Dolomite

Impact of Sodium Hexametaphosphate on the Flotation of Ultrafine Magnesite from Dolomite-rich Desliming Tailings

Molecular Dynamics Simulation of Cetyl Phosphate Adsorption in Flotation of Magnesite and Pertinent Chemical Aspects

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