The depression of pyrite in selective flotation by different reagent systems – A Literature review

Mu, Yufan; Peng, Yongjun; Lauten, Rolf Andreas

doi:10.1016/j.mineng.2016.06.018

Cited by 187 publications

(76 citation statements)

References 110 publications

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“…As the direct approach for reflecting the adsorption amount difference of reagents on the mineral surfaces, adsorption tests are applied universally to provide guidance for the analysis of flotation separation [20]. Figure 8a,b show the effect of the KG/PBX addition order on the adsorption of PBX on pyrite and talc surfaces, respectively.…”

Section: Adsorption Test Resultsmentioning

confidence: 99%

Flotation and Adsorption of a New Polysaccharide Depressant on Pyrite and Talc in the Presence of a Pre-Adsorbed Xanthate Collector

Deng

Tian

et al. 2017

Minerals

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Abstract:The flotation and adsorption of a new polysaccharide konjac gum (KG) on pyrite and talc in the presence of pre-adsorbed potassium butyl xanthate (PBX) is investigated. The micro-flotation results show that KG is a quality depressant for talc and that conditioning the minerals initially with PBX before KG will increase the recovery difference between pyrite and talc. The results of artificially mixing the minerals show that compared with adding KG before PBX, when minerals are pre-adsorbed with PBX, the grade and the recovery of sulfur (S) increases by 1.96% and 5.44%, respectively. The contact angle results show that the addition of PBX before KG will increase the contact angles of pyrite, but the addition order of KG/PBX has little influence on the contact angles of talc. The adsorption tests show that KG can adsorb on pyrite and talc surfaces, while PBX can only adsorb on the pyrite surface. The addition order of KG/PBX affects the adsorption of KG and PBX on the pyrite surface but not on the talc surface. Fourier transform infrared (FTIR) spectra analysis further demonstrates the chemical adsorption of KG on pyrite and talc surfaces, while PBX chemisorbs on the pyrite surface. Based on these analyses, a schematic illustration of the reagent adsorption forms on pyrite and talc surfaces is drawn to explain the competitive adsorption of KG and PBX on mineral surfaces.

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Section: Adsorption Test Resultsmentioning

confidence: 99%

Flotation and Adsorption of a New Polysaccharide Depressant on Pyrite and Talc in the Presence of a Pre-Adsorbed Xanthate Collector

Deng

Tian

et al. 2017

Minerals

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“…In most studies, hence, the recovery and grade have been improved by introducing effective or novel depressants. [12][13][14][15][16][17][18][19][20] Various inorganic salts and organic polymers such as dextrin, starch, carboxymethyl cellulose, ferrochrome lignosulfonate, potassium dichromate, sodium humate, ammonium persulfate have been introduced as a depressant in complex sul de mineral otation processes. [12][13][14][15][16] For instance, Rath and Subramanian reported that galena can be effectively depressed using dextrin in the pH range of 10 to 12 and sphalerite recovery can be improved to 85%.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14][15][16][17][18][19][20] Depressants often work by changing surface properties via surface oxidation and polymer adsorption, which interferes with bubble attachment. 18,19) When a collector is required, changed surface properties interfere with collector attachment, and eventually prohibits bubble attachment.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Surface Characteristics and Floatability in Representative Sulfide Minerals: Role of Surface Oxidation

et al. 2017

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This study investigates how changes in the surface properties of three representative sul de minerals (galena, sphalerite and chalcopyrite) affect their oatability in the presence of an oxidizing agent (H 2 O 2 ). Tests were conducted at four molar ratios of H 2 O 2 :mineral (0, 0.5, 1.0, and 2.0). To better capture the effect of surface oxidation, the tests were conducted at both acid and basic conditions (i.e., pH = 3 and 10). In all surface property and oatability evaluations, the pH and Eh were equilibrated. The surface properties were evaluated by X-ray diffraction, Fourier transform infrared spectroscopy, zeta potential measurements and contact angle analyses. The oatability was evaluated by a micro otation method. At the acidic initial pH, galena most sensitively reacted with H 2 O 2 , followed by chalcopyrite and sphalerite, whereas at pH 10, the reactivity differences were insigni cant. H 2 O 2 addition changed the sul de species (initially present on the mineral surface) to sulfate or hydroxyl species, and decreased the mineral oatability. To investigate the surface property that mainly reduced the mineral oatability in the presence of H 2 O 2 , we measured the zeta potentials and contact angles, which are closely associated with the electrostatic and hydrophobic forces, respectively. The oatability depended on the contact angle after the H 2 O 2 addition, implying that the oatability was mainly reduced through oxidation reactions, which increased the hydrophilicity of the mineral surface.

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“…These polymers are not only nontoxic but also biodegradable and relatively inexpensive. In numerous laboratory investigations, sulfide minerals such as galena [16][17][18] and pyrite [19][20][21][22] have been successfully depressed. Many studies have considered the feasibility of polysaccharides as a chalcopyrite depressant in Cu-Mo separation flotation, including ATDT [23], DMTC [24], tannin [25], chitosan [26], and so on.…”

Section: Introductionmentioning

confidence: 99%

An Alternative Depressant of Chalcopyrite in Cu–Mo Differential Flotation and Its Interaction Mechanism

et al. 2018

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Carboxymethylcellulose (CMC) is a nontoxic and biodegradable polysaccharide, which can potentially replace the frequently used hazardous depressants in Cu-Mo separation. However, a lack of understanding of the interaction mechanism between the CMC and the minerals has hindered its application. In the present study, it is found that 50 mg·L −1 CMC can inhibit chalcopyrite entirely in the pH range 4-6, while having little effect on molybdenite. The results also showed that the inhibition effect of the depressant for chalcopyrite enhanced with the increase of the degree of substitution (DS) and molecular weight (M w ) of CMC. The low DS and high M w of CMC were detrimental to the Cu-Mo separation flotation. Furthermore, CMC adsorption was found to be favored by a positive zeta potential but hindered by the protonation of the carboxyl groups. An electrochemical study showed that CMC inhibited 92.9% of the electrochemical reaction sites of chalcopyrite and greatly reduced the production of hydrophobic substances. The XPS and FTIR measurements displayed that the chemisorption was mainly caused by Fe 3+ on the chalcopyrite surface and the carboxyl groups in the CMC molecular structure. Minerals 2019, 9, 1 2 of 11 polysaccharides as a chalcopyrite depressant in Cu-Mo separation flotation, including ATDT [23], DMTC [24], tannin [25], chitosan [26], and so on. Carboxymethylcellulose (CMC), a natural polysaccharide which is widely used as a talc depressant and food additive [27][28][29], might be suitable for this purpose. CMC is known to inhibit chalcopyrite under certain conditions [30,31]. However, the interaction mechanism between CMC and the chalcopyrite surface has rarely been investigated. The general interaction between polysaccharides and sulfide ores is highly controversial and needs resolving in many further studies. The present study assessed the efficiency of CMC as a depressant of chalcopyrite in Cu-Mo differential flotation and elucidated the underlying interaction mechanism.

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The depression of pyrite in selective flotation by different reagent systems – A Literature review

Cited by 187 publications

References 110 publications

Flotation and Adsorption of a New Polysaccharide Depressant on Pyrite and Talc in the Presence of a Pre-Adsorbed Xanthate Collector

Flotation and Adsorption of a New Polysaccharide Depressant on Pyrite and Talc in the Presence of a Pre-Adsorbed Xanthate Collector

Relationship between Surface Characteristics and Floatability in Representative Sulfide Minerals: Role of Surface Oxidation

An Alternative Depressant of Chalcopyrite in Cu–Mo Differential Flotation and Its Interaction Mechanism

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