Effect of the morphology of adsorbed oleate on the wettability of a collophane surface

Ye, Junjian; Zhang, Qin; Li, Xianbo; Wang, Xianchen; Ke, Baolin; Li, Xianhai; Zhang, Shen

doi:10.1016/j.apsusc.2018.03.020

Cited by 22 publications

(18 citation statements)

References 47 publications

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“…To determine the appropriate concentration of NaOL, the surface tension of different concentrations of NaOL solution was measured in advance to determine its semi micelle concentration ( Figure 7). The results indicated that the CMC of NaOL was approximately 1 × 10 -3 mol/L, which is consistent with the results in the literature [37]. On the other hand, for the beneficiation of calcium magnesium phosphate ore, the reverse flotation was a widely used high-efficiency separation process using the sulfuric acid, phosphoric acid, etc.…”

Section: Effect Of Surface Roughness On Contact Angle Of Apatite and supporting

confidence: 89%

“…The droplet method was used to measure the contact angle of the mineral surface (HARKE-SPCAX3, Beijing Hake Test Instrument Factory, Beijing, China) as seen in Figure 3. The specific steps were as follows [37]: The mineral was immersed in a certain concentration of the collector solution for 12 h and then naturally dried and placed on the test platform. A water droplet with a volume of about 2 µL was squeezed out by a syringe and then dropped on to the mineral surface slowly and automatically.…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

“…To reveal the effect of surface roughness on the wettability of apatite and dolomite surfaces in the background of the flotation process, the different wetting characteristics of apatite and dolomite surface were obtained with different treatments including various concentrations of collector. It has been well established that NaOL is a powerful collector for oxidized ore, such as apatite [37], dolomite [41], fluorite [42], pyrochlore [43], malachite [22], and so on. When it adsorbed on apatite and dolomite surfaces, it changed the hydrophilic mineral surface to hydrophobic [2,44].…”

Section: Effect Of Surface Roughness On Contact Angle Of Apatite and mentioning

confidence: 99%

“…When it adsorbed on apatite and dolomite surfaces, it changed the hydrophilic mineral surface to hydrophobic [2,44]. However, when the concentration of NaOL exceeded the critical micelle concentration (CMC), the mineral surface became hydrophilic again due to the double-layer adsorption of NaOL molecules on mineral surfaces [37,45].…”

Section: Effect Of Surface Roughness On Contact Angle Of Apatite and mentioning

confidence: 99%

“…Therefore, the control of surface wettability is of great significance. Although there have been many studies on the flotation separation technology and development of flotation reagents of apatite and dolomite [2,[34][35][36][37], few studies on the influence of roughness on the wettability of mineral surface have been carried out. For the flotation system of apatite and dolomite, it could be a new insight to enhance the surface wettability from the perspective of roughness.This study aimed to investigate the influence of roughness on the wettability of apatite and dolomite surfaces before and after the modification of a flotation reagent (collector and pH regulator).…”

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confidence: 99%

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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: Effect Of Surface Roughness On Contact Angle Of Apatite and supporting

confidence: 89%

Section: Contact Angle Measurementsmentioning

confidence: 99%

Section: Effect Of Surface Roughness On Contact Angle Of Apatite and mentioning

confidence: 99%

Section: Effect Of Surface Roughness On Contact Angle Of Apatite and mentioning

confidence: 99%

mentioning

confidence: 99%

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

Wang

Zhang

2020

Minerals

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The flotation separation of apatite from dolomite using a fatty acid‐based collector and the mechanisms of adsorption

Kang

Zhang

2022

Surface & Interface Analysis

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In this work, GJBW, a fatty acid‐based agent, was used as an efficient collector to separate dolomite from apatite to achieve high‐purity apatite. The flotation performance of dolomite and apatite in the phosphate (H3PO4) system treated with sodium oleate (NaOl) and GJBW, respectively, was studied and compared. Microheat tests, surface characterization, and flotation solution chemistry calculations were used to evaluate the adsorption mechanism of GJBW onto dolomite. The smoothness and flatness of dolomite treated and untreated with GJBW may be also detected via atomic force microscopy (AFM). Microflotation results illustrated that GJBW performed better than NaOl for separating apatite from dolomite under the H3PO4 system. The grade of P2O5 in concentrates treated with 10 mg/L GJBW was 31.49%, which was 4.98% higher than that of NaOl. The recovery rate of P2O5 was 87.05%, which was 4.71% higher than that of NaOl. Microheat tests demonstrated that GJBW generated a higher heat of adsorption onto dolomite than did the same concentration of NaOl, significantly enhancing the dolomite's hydrophobicity. Fourier transform infrared spectroscopy (FTIR), zeta potential, flotation solution chemistry calculations, and surface characterization further demonstrated that GJBW may ionize large amounts of RCOO− and H (RCOO)2− ions in solution, which can be significantly chemisorbed with numerous sites of Ca and Mg exposed to dolomite, forming dense point‐like adsorption onto dolomite. These findings shed more light on the mechanism of interaction between GJBW and dolomite, which has profound implications for the study and use of fatty acid‐based treatments in phosphate ores.

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Review of the reagents used in the direct flotation of phosphate ores

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Effect of the morphology of adsorbed oleate on the wettability of a collophane surface

Cited by 22 publications

References 47 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

The flotation separation of apatite from dolomite using a fatty acid‐based collector and the mechanisms of adsorption

Review of the reagents used in the direct flotation of phosphate ores

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