The role of oxidizer in the flotation separation of chalcopyrite and galena using sodium lignosulfonate as a depressant

Chen, Yuangan; Feng, Bo; Guo, Yanan; Wang, Tao; Zhang, Liangzhu; Zhong, Chunhui; Wang, Huihui

doi:10.1016/j.mineng.2021.107160

Cited by 30 publications

(4 citation statements)

References 33 publications

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“…Surely, there was no doubt that peaks of phosphate/hydrogen phosphate (133.6 eV) and manganese phosphate (134.5 eV) were present in the P 2p high-resolution spectra of LDH-LS@CS@PAMn. , In the S 2p high-resolution spectrum of LDH-LS@CS@PAMn, peaks of 165.1, 163.8, 167.6, and 168.9 eV appeared, which respectively correspond to C-S 2p 1/2 , C-S 2p 3/2 , SO 3 2– 2p 3/2 , and SO 3 2– 2p 1/2. , In addition, peaks at 642.3 and 654.0 eV in the Mn high-resolution spectra, are represented the Mn 2p 3/2 and Mn 2p 1/2 , while the peaks observed at 646.5 and 657.4 eV were the satellite peaks of Mn 2p 1/2 and Mn 2p 3/2. The above results demonstrated that Mn 2+ was successfully introduced into LDH-LS@CS@PAMn through P–O– interactions with PA.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Green and Scalable N/P/S/Mn Containing Biobased Layered Double Hydroxide as a Novel Flame Retardant and Efficient Char Forming Agent for Polypropylene

Yan

Ding

Min

et al. 2023

ACS Sustainable Chem. Eng.

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To date, designing efficient bio-based flame retardants for polypropylene (PP) and exploring a green and scalable strategy have remained a hot topic of research. Here, we present a green and convenient preparation of a bio-based flame retardant (LDH-LS@CS@PAMn) for layer-by-layer assembly by utilizing water as an assembly medium. By electrostatic interactions, LDH-LS@CS@PAMn was prepared by the sequential assembly of sodium lignosulfonate-modified layered double hydroxide (LDH-LS) with positively charged chitosan (CS) followed by negatively charged sodium phytate (PAMn). With increasing LDH-LS@CS@PAMn loading in PP composites, the corresponding total heat release rate (THR) and peak heat release rate (PHRR) values were reduced remarkably. With loading 20 wt % LDH-LS@CS@PAMn, the THR and PHRR of PP/LDH-LS@ CS@PAMn decreased by 37.6 and 59.1%, respectively, while the limiting oxygen index significantly improved to 31.6% and the V-0 rating was successfully passed by the UL-94. Especially for PP/LDH-LS@CS@PAMn composites, the total smoke production (TSP) was reduced by 47.4%. More importantly, the residual PP/LDH-LS@CS@PAMn char changed from gray to brown-black compared to PP/LDH, indicating a stronger residual char formation. The outstanding fire safety, smoke suppression, and char formation capabilities of PP composites were ascribed to the synergistic LDH-LS@CS@PAMn hybrid's action. This work provided a feasible and reasonable modification idea to improve smoke suppression and flame retardancy for LDH.

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Section: Resultsmentioning

confidence: 99%

Fabrication of Green and Scalable N/P/S/Mn Containing Biobased Layered Double Hydroxide as a Novel Flame Retardant and Efficient Char Forming Agent for Polypropylene

Yan

Ding

Min

et al. 2023

ACS Sustainable Chem. Eng.

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“…In order to verify the applicability of this equation, the fitted curve of y = −298.81x + 213.05 shown in Figure 8 was applied to the published studies [12,19,46,47], showing a good prediction of this method (Table 4). For instance, Suyantara et al [12] investigated the effects of a Fenton-like reagent on the surface hydrophobicity and floatability of chalcopyrite, observing hydrophobic S 0 , S 8 and hydrophilic FeOOH, CuO/Cu(OH) 2 , and Fe 2 (SO 4 ) 3 on the untreated chalcopyrite surface.…”

Section: Verification Of the Quantitative Equationmentioning

confidence: 99%

A Quantitative Relationship between Oxidation Index and Chalcopyrite Flotation Recovery

Yang

Chen

et al. 2022

Minerals

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The surface oxidation of chalcopyrite is one of the most important factors affecting its flotation performance. In this study, a critical oxidation degree is proposed to define “slight” and “significant” oxidation in terms of surface species and chalcopyrite flotation recovery. Slight oxidation enhanced chalcopyrite hydrophobicity, but significant oxidation reduced its recovery apparently. Microthermokinetic measurements indicated that the apparent activation energy (Ea) of chalcopyrite oxidation was reduced from around 173 kJ·mol−1 to 163 kJ·mol−1 when the reaction changed from slight oxidation to significant oxidation when applying H2O2. The surface oxidation degree was defined as the ratio of hydrophilic species to hydrophobic species. The highest recovery (94.8%) and contact angle (93°) were achieved at a concentration of 0.1 vol.% H2O2, with the lowest oxidation degree of 0.388 being observed. The oxidation degree was correlated to the flotation recovery, with a quantitative relationship (y = −298.81x + 213.05, y and x represent flotation recovery and oxidation degree, respectively, 0.388 ≤ x ≤ 0.618) being established, thereby giving a guideline to better manage chalcopyrite flotation by controlling its surface oxidation and SBX adsorption on chalcopyrite surfaces.

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“…Pb and Zn are widely used in metallurgy, national defense, automotive, and electronics [1,2]. Galena and sphalerite are the main sources of Pb and Zn extracted by these industries and often coexists in nature [3,4].…”

Section: Introductionmentioning

confidence: 99%

Effects of seawater on the adsorption of xanthate onto galena and sphalerite

Song,

Yao,

Yin

2024

J. Phys.: Conf. Ser.

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Seawater contains divalent calcium and magnesium cations. Under alkaline conditions, calcium and magnesium ions react with hydroxide ions to form insoluble hydroxyl complexes or hydroxide precipitates. The hydrophilic substances that may be adsorbed on the mineral surface during the flotation process hinder the adsorption of the collector, affecting mineral hydrophobicity, and thus reducing the floatability of the mineral. In this study, the effects of seawater on the adsorption of xanthate onto galena and sphalerite were investigated. The results show that under strong alkaline conditions, seawater has significant and slight adverse effects on sphalerite and galena, respectively. Flotation regulators such as ethylenediamine tetraacetic acid, sodium hexametaphosphate, and sodium silicate can eliminate the adverse effect on galena and sphalerite flotation to a certain extent. The mechanisms were revealed through microflotation experiments, contact angle measurements, bubble-particle attachment tests, zeta potential measurements, and XPS analysis.

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The role of oxidizer in the flotation separation of chalcopyrite and galena using sodium lignosulfonate as a depressant

Cited by 30 publications

References 33 publications

Fabrication of Green and Scalable N/P/S/Mn Containing Biobased Layered Double Hydroxide as a Novel Flame Retardant and Efficient Char Forming Agent for Polypropylene

Fabrication of Green and Scalable N/P/S/Mn Containing Biobased Layered Double Hydroxide as a Novel Flame Retardant and Efficient Char Forming Agent for Polypropylene

A Quantitative Relationship between Oxidation Index and Chalcopyrite Flotation Recovery

Effects of seawater on the adsorption of xanthate onto galena and sphalerite

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