Importance of collector chain length in flotation of fine particles

Medeiros, Ailma Roberia Souto de; Baltar, Carlos Adolpho Magalhães

doi:10.1016/j.mineng.2018.03.008

Cited by 40 publications

(11 citation statements)

References 21 publications

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“…According to Equations (2) the probability of collision with the bubble, which is reflected in increased flotation recovery [33,34].…”

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confidence: 99%

“…In contrast, a slight increase in recovery of clinochlore is observed within increasing Al (III) ions concentration. The aggregation of the fine clinochlore particles caused by aluminum sulfate increases the probability of collision with the bubble, which is reflected in increased flotation recovery [33,34]. Especially, at Al (III) ions concentration above 2.4 × 10 −4 mol/dm 3 , the recovery of cassiterite is below 10% while that of clinochlore remains above 70%.…”

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confidence: 99%

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Effect of Al (III) Ions on the Separation of Cassiterite and Clinochlore Through Reverse Flotation

et al. 2018

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Most hydrophobic clay minerals, such as clinochlore, are known to cause problems in the recovery of cassiterite. In this study, a new reagent scheme, i.e., sodium oleate (NaOL) as a collector and Al (III) ions as a depressant, for reverse flotation separation of cassiterite and clinochlore was investigated. The flotation performance and interaction mechanism were studied by microflotation tests, adsorption tests, contact angle measurements, and X-ray photoelectron spectroscopy (XPS) analysis. Results of single mineral flotation experiments showed that NaOL had a different flotation performance on cassiterite and clinochlore, and the addition of Al (III) ions could selectively inhibit the floatability of cassiterite. Reverse flotation tests performed on mixed minerals indicated that the separation of cassiterite and clinochlore could be achieved in the presence of NaOL and Al (III) ions. Adsorption experiments demonstrated that Al (III) ions hindered the adsorption of NaOL on cassiterite surfaces but exerted little influence on the adsorption of NaOL on clinochlore surfaces. Results of contact angle measurements indicated that Al (III) ions could impede the hydrophobization process of cassiterite in NaOL solution. XPS results showed that aluminum species were adsorbed onto the cassiterite surfaces through the interaction with O sites.

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“…According to Equations (2) the probability of collision with the bubble, which is reflected in increased flotation recovery [33,34].…”

mentioning

confidence: 99%

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confidence: 99%

Effect of Al (III) Ions on the Separation of Cassiterite and Clinochlore Through Reverse Flotation

et al. 2018

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“…Due to the need of understanding what happens during quartz flotation, precious studies related to this topic using DDA, showed that flotation radically decrease with sizes from hydrophobic aggregate, which in turn increases with the length of the collector chain [22]. Similarly, flotation depends more significant on particle and bubble sizes.…”

Section: Discussionmentioning

confidence: 99%

Assessment of Silica Recovery from Metallurgical Mining Waste, by Means of Column Flotation

Salinas‐Rodríguez

Flores-Badillo

Hernández-Ávila

et al. 2020

Metals

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The generation of mining waste commonly led to the use of spaces for its disposal. Challenges like mitigating the damage to surrounding communities have promoted the need to reuse, recycle and/or reduce their generation. Besides, these residues may become a source of materials, which are capable of being recovered and reused in several industries, minimizing the environmental impact. In the mining region of Pachuca, Mexico, waste from the mining industry have been generated for more than 100 years, which have a high SiO2 content that can be recovered for various industrial applications. This work aims to recover silica from a material of the Dos Carlos dam. A columnar system composed of two-stage of cleaning was used, considering a JLT (surface liquid rate) value of 0.45 and 0.68 cm/s, respectively; while the Jg (surface gas rate) value was 0.30 cm/s for both stages. Similar bubble sizes in the range of Jg 0.10 to 0.30 cm/s, with values between 0.14 and 0.16 cm in the first stage, and 0.05 to 0.06 cm in the second one. This provided a recovery of 75.10% for all the allotropic phases of silica (quartz, trydimite, and cristobalite) leaving a concentration of 24.90% of a feldspathic phase (orthoclase), as flotation tails.

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“…Flotation reagents are the key to improving flotation indicators. The most important flotation reagents are mainly collectors [16,17], depressants [18,19] and regulators [20]. The role of the depressants in flotation is mainly to selectively be adsorbed on certain mineral surfaces to reduce their floatability [21,22].…”

Section: Introductionmentioning

confidence: 99%

Use of Sodium Hexametaphosphate and Citric Acid Mixture as Depressant in the Flotation Separation of Scheelite from Calcite

et al. 2019

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The floatability of scheelite and calcite in the presence of single depressant (SHMP or H 3 Cit) and mixed depressant (SHMP/H 3 Cit) was studied by microflotation experiments and artificial mixed mineral experiments. Solution chemical calculation, zeta potential tests, thermodynamic analysis and XPS analysis were used to explain the relevant depressive mechanism. Mixed depressant (SHMP/H 3 Cit) exhibited excellent selective depressive effect on calcite. The optimal molar ratio of SHMP to H 3 Cit was 1:4. The depressant SHMP and H 3 Cit can be chemically bonded with Ca 2+ to form CaHPO 4 and Ca 3 (Cit) 2 at pH 8. The CaHPO 4 was more easily formed than Ca 3 (Cit) 2 on the mineral surface, which indicated that the depressive effect of SHMP was stronger than H 3 Cit. The SHMP and H 3 Cit of the mixed depressant were co-adsorbed on the calcite surface, while the H 3 Cit of the mixed depressant was weakly adsorbed on the scheelite surface. The mixed depressant can significantly improve the separation efficiency of scheelite from calcite. Sodium silicate (water glass) has been widely used as a depressant in flotation of scheelite from calcite [23]. However, sodium silicate also has some disadvantages as a depressant, such as frequent acidification, narrow optimum pH range, and weak selectivity. Single phosphates are also used for calcite depressants, but they are often limited by their weak selectivity, so mixed reagents are often required [24]. Organic macromolecular depressants have also received attention. Zhang et al. studied the role of sodium polyacrylate in flotation separation of scheelite and calcite [25]. However, sodium polyacrylate also has an unfavorable inhibitory effect on scheelite over a wide range of pH conditions, with poor flotation selectivity. Carboxymethyl cellulose has also been studied as a depressant in the flotation separation of scheelite from calcite [26], but it is difficult to dissolve carboxymethyl cellulose at room temperature, which is not conducive to flotation. In view of the shortcomings of the above single depressants, such as poor collecting ability, weak selectivity, and large dosage, it is often necessary to use mixed depressant to achieve flotation separation between scheelite and gangue minerals.Sodium hexametaphosphate (SHMP) is a clean, non-toxic phosphate that is widely used in the food industry and the chemical industry [27,28]. It can be used as a chelating reagent for metal ions, an adhesive, and a swelling reagent [29,30]. It is also widely used in the mineral processing industry, especially in the floatation. SHMP is used as a dispersant and depressant of minerals in flotation [31][32][33][34][35]. In addition, SHMP can be used to depress calcite [24], but it also has a strong depressive effect on scheelite. Citric acid (H 3 Cit) is also a clean, non-toxic organic acid and is a tricarboxylic acid compound. It is mainly used in the food industry, chemical industry, textile industry, cosmetics and pharmaceutical industries [36][37][38]. Citric acid can be used as depress...

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Importance of collector chain length in flotation of fine particles

Cited by 40 publications

References 21 publications

Effect of Al (III) Ions on the Separation of Cassiterite and Clinochlore Through Reverse Flotation

Effect of Al (III) Ions on the Separation of Cassiterite and Clinochlore Through Reverse Flotation

Assessment of Silica Recovery from Metallurgical Mining Waste, by Means of Column Flotation

Use of Sodium Hexametaphosphate and Citric Acid Mixture as Depressant in the Flotation Separation of Scheelite from Calcite

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