Minerals
·
2021
·Vol. 11
·期 6
·555
·
IF 2.644
Chenhu Zhang,Jiande Gao,Yuehua Hu,Wei Sun,Fei Lv,Zhenjun Liu
Fluorite is a nonrenewable mineral used to produce anhydrous hydrofluoric acid (AHF) and aluminum fluoride. The demand for low-grade fluorite powder (CaF2< 97%) has fallen sharply owing to the current market conditions. Therefore, a large number of fluorite concentrates have been improved by acid leaching. While this approach can efficiently remove CaCO3from fluorite concentrate, the SiO2content, which significantly affects AHF consumption during the production of HF or aluminum fluoride, cannot be completely removed. To solve this problem, in this study, we used reverse flotation before leaching the fluorite concentrates. Subsequently, the feasibility of reverse flotation desilication was determined. The obtained results of the ZP (zeta potential) measurements, solution chemistry analysis, FTIR (Fourier transform infrared spectroscopy) analysis, and micro-flotation tests indicated that employing dodecylamine as the collector and citric acid as the depressor could effectively separate sericite from fluorite. The batch flotation experiment and the pilot test were conducted in Chenzhou (Hunan, China) followed by their operation in Xinyuan Mining Co. Ltd., which produces monolithic fluorite ore on the large scale in Asia. Notably, we found that the contents of both SiO2and Al2O3were from 2.82%, 1.17% reduced to 1.28%, 0.74% in the batch flotation experiment. The results of the pilot test showed that the new reverse flotation + leaching technology could dramatically reduce the potential environmental impact and costs, thereby significantly improving the economic benefits by satisfying the requirements of the market.Keywords:fluorite;desilication;reverse flotation;leaching
研究领域:
矿物加工工程
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环境科学与工程
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产品关联
DOI
高影响因子
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
·
2018
·Vol. 71
·期 8
·1841-1846
·
IF 0.91
Shen Liang,Liu Lingyun,Zhu Jinbo,Qiao Erle
Reverse flotation was proposed as a potential method for the upgradation of low rank thermal coal. Higher combustible matter recovery in the float could be obtained using reverse flotation method compared to conventional flotation method. In order to reduce the entrainment of fine particles, oleic acid (OA) was used as froth regulator in coal reverse flotation process. Experimental data showed that the total volume of froth product in the absence of OA was almost 3 times more than that in the presence of 0.45 kg/Mg OA dosage. Reverse flotation results showed that the ash content of froth product increased with the increase of OA dosage which indicated that the entrained coal particles could be decreased by the addition of froth regulator OA.
研究领域:
矿物加工工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2018
·
IF 3.23
Yonggai Li,Jiawei Li,Peng Chen,Jianzhong Chen,Lijuan Shen,Xiangnan Zhu,Gan Cheng
In this study, X-ray Photoelectron Spectroscopy (XPS) was used to analyze the elements on the surface of subbituminous coal , and reverse flotation was introduced to float subbituminous coal. The effect of ultra-fine coal on the flotation behavior of silica in coal reverse flotation was discussed by comparing the flotation performance with two different artificial mixed flotation feedings, with ultra-fine coal (UFC, −45 μm) or without ultra-fine coal. The comparison results showed that the existence of UFC reduced the flotation rate and the recovery of silica, as well as the separation efficiency of subbituminous coal reverse flotation. Compared to the flotation performance of feeding with UFC, the concentrate ash content of feeding without UFC was lower (9.18%), and the separation efficiency was higher (68.69%). Total Organic Carbon Analyzer was used to test the adsorption quantity of collector by coal and silica to explain the mechanism. Conclusions were obtained that ultra-fine coal particles could adsorb more collector due to their larger specific surface area, leading to less collector left in the pulp to float silica particles. Selective flocculation reverse flotation method could increase the separation efficiency of coal reverse flotation with appropriate dosage flocculant .
研究领域:
矿物加工工程
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煤炭科学与技术
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2025
·
IF 5.2
Wenbao Liu,Ruiqi Ge,Ying Guo,Yu Xia,Sikai Zhao,Wengang Liu,Baoyu Cui,Yanbai Shen
Efficient utilization of low-grade apatite is crucial for securing a stable supply of phosphate fertilizers, making the research and development of high-efficiency collectors essential for its utilization. This study introduces a novel, eco-friendly hydroxyl quaternary ammonium collector, dodecyl dimethyl hydroxyethyl ammonium bromide (DHDB), for the reverse flotation desilication of apatite. The flotation performance and adsorption mechanism of DHDB were systematically investigated through flotation tests, contact angle tests, Fourier transform infrared spectrometer (FTIR) measurements, and molecular dynamics simulations. The flotation results demonstrated that DHDB exhibited excellent selectivity at lower dosages and across a wide pH range, enabling quick and effective separation of quartz from apatite. Mechanism tests and molecular dynamics simulations indicated that the adsorption of DHDB on minerals was primarily driven by electrostatic interactions and hydrogen bonding. The weak electronegativity of the apatite surface and the steric hindrance of the polar groups from DHDB resulted in the poor adsorption of DHDB on the apatite surface. Additionally, the selective separation of quartz from apatite was primarily due to the significantly lower adsorption energy and capacity of DHDB on apatite compared to quartz.
研究领域:
矿物加工工程
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材料科学
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环境科学
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产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Wenxuan Huang,Wenbiao Liu,Wenlin Zhong,Xiaopeng Chi,Feng Rao
In this study, the effects of common ions, especially Ca 2+ , on the reverse flotation of fluorapatite and dolomite in acidic conditions with NaOL collector were investigated using micro-flotation, zeta potential, contact angle, adsorption analysis, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and density functional theory-based first principal calculations. It is found that the dolomite flotation recovery was enhanced and the fluorapatite flotation was depressed by the addition of CaCl 2 at pH 5. For dolomite, in the presence of CaCl 2 , the solubility of metal ions was increased, especially for Ca 2+ . The Ca and Mg sites exposed on the dolomite surface, increased the NaOL adsorption, thus, enhancing the dolomite flotation. However, the formation of Ca(H 2 PO 4 ) 2 species on fluorapatite surface inhibit its flotation.
研究领域:
矿物加工工程
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Zhonghua Xue,Yali Feng,Haoran Li
Investigating the reverse flotation desilication process of magnesite tailings (MT) holds substantial merit in the context of magnesium metal recovery from solid waste. However, scant attention has been devoted to exploring the influence of the carbon chain length of diverse alkanes on the reverse flocfloatation desilication of MT. This research systematically delved into the selective adsorption behavior exhibited by dodecylamine (DDA) and its compound collectors on the surfaces of quartz and magnesite. As the carbon chain length of alkanes increases, the efficacy of reverse flotation desilication of MT diminishes. Under optimized conditions, the concentration of MgO in the concentrate registers a 0.93% increment, accompanied by a 2.05% reduction in SiO 2 content. The optimal MgO grade attains 42.68%. The augmenting carbon chain length of alkanes leads to a decline in the dispersibility of the compound collector and a reduction in the diffusion coefficient of the monolayer film at the alkane/water interface. The compound collector, comprising n-heptane and DDA, manifests a noteworthy synergistic promotion effect on the flotation desilication of MT. This effect reduces the multilayer adsorption of DDA, promotes more hydrogen bonding formation, and favors DDA adsorption on the quartz surface over magnesite. Consequently, issues related to froth entrapment and poor selectivity are alleviated. Longer alkane chains in the compound collectors result in a stronger van der Waals force effect between the carbon chains. This effect causes DDDA to slide more easily on the quartz surface, which is not conducive to enhancing the hydrophobicity of the surface. Furthermore, alkane-induced hydrophobic flocculation increases the floccules size of quartz, enhancing the likelihood of bubble-particle adhesion. This investigation elucidates the molecular-level mechanism underlying alkane hydrophobic flocculation with varying chain lengths, contributing a theoretical foundation and technical support for the large-scale MT management and the sustainable production of magnesium metal.
研究领域:
矿物加工工程
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材料科学与工程
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产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2021
·
IF 5.134
Hongyang Wang,Lizhangzheng Wang,Siyuan Yang,Cheng Liu,Yanling Xu
Depressant carboxymethyl chitosan (CMCS) was introduced to reverse flotation of quartz from hematite using collector DDA. Microflotation experiments presented that CMCS completely depressed the hematite flotation while it had little effect on quartz flotation. The mineral mixture flotation confirmed the reagent scheme of DDA/CMCS could achieve efficient separation of quartz from hematite. It was also found that CMCS has better selective depression ability than the widely-used starch . Zeta potential measurements illustrated that CMCS could prevent DDA adsorption onto the hematite surface, while it did not affect the interaction between DDA and quartz surface. X-ray photoelectron spectroscopy (XPS) indicated that CMCS interacted with the Fe(III) components of hematite by chemisorption , which was stronger than the bonding between starch and hematite. Molecular dynamics simulation (MDS) further revealed the twice interaction energy of CMCS with (001) hematite surface than that of starch. Hence, CMCS has the potential to replace starch in practice.
研究领域:
矿物加工工程
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材料科学与工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Zhanglei Zhu,Wanzhong Yin,Bin Yang,Yafeng Fu,Jiwei Xue
Slime contamination is an urgent problem that should be solved in coal flotation. The adverse effects of slime contamination, by which low-ash clean coal is covered by high-ash fine slime and hence cannot be separated through the direct flotation process, have been recognized for the past decades. In this investigation, to reduce slime contamination, the reverse-and-direct flotation process was proposed. Flotation results indicated that, based on the similar ash content, the concentrate yield increased by 7.36% using the reserve-and-direct flotation process compared with the two-steps direct flotation process. XPS (X-ray Photoelectron Spectroscopy) and SEM (Scanning Electron Microscopy) results verified that the reduction of fine clay minerals coating on the surface of clean coal was achieved and hence the flotation performance was improved with the reverse-and direct flotation process. Therefore, it can be arrived that the reverse-and-direct flotation process is a potential and effective separation method to upgrade the flotation performance of fine coking coal.
研究领域:
矿物加工工程
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煤炭浮选技术
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Bin Yang,Ya-Feng Fu,Wan-Zhong Yin,Qiu-Yue Sheng,Zhang-Lei Zhu,Xue-Ming Yin
In this study, laurylamine ethoxylate with fifteen ethoxylate units (LAEO-15) was employed as a quartz collector for the recovery of malachite from quartz via reverse flotation. Its collecting performance and adsorption mechanism were evaluated by flotation tests and surface analyses. The results of flotation tests suggested that LAEO-15 had an intense ability to collect quartz instead of malachite, and displayed a high flotation selectivity, which promoted the significant floatability differences of both minerals. XPS confirmed that quartz adsorbed a much larger quantity of LAEO-15 than malachite, resulting in the selective collection of quartz with LAEO-15. Zeta potential and FTIR characterization further uncovered that the strong adsorption of LAEO-15 was driven by hydrogen bonding and electrostatic attraction, while electrostatic repulsion hindered the LAEO-15 adsorption on the surface of malachite. As a result, the effective separation of malachite and quartz was realized with 20 mg/L LAEO-15 at pH 6.30 via reverse flotation, in which 92.54% of malachite was recovered and 92.72% of quartz was removed, coupled with a high SI value of 12.57 in concentrate. Therefore, compared with conventional collector dodecylamine, LAEO-15 exhibited high selectivity and purification effectiveness for the separation of malachite from quartz.
研究领域:
矿物加工工程
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材料科学与工程
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DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2021
·Vol. 29
·期 3
·446-454
·
IF 2.232
Liu Wenbiao,Huang Wenxuan,Rao Feng,Zhu Zhanglei,Zheng Yongming,Wen Shuming
Reverse flotation desilication is an indispensable step for obtaining high-grade fluorapatite. In this work, dodecyltrimethylammonium bromide (DTAB) is recommended as an efficient collector for the reverse flotation separation of quartz from fluorapatite. Its collectivity for quartz and selectivity for fluorapatite were also compared with figures corresponding to the conventional collector dodecylamine hydrochloride (DAC) via microflotation experiments. The adsorption behaviors of DTAB and DAC on minerals were systematically investigated with surface chemical analyses, such as contact angle determination, zeta potential detection, and adsorption density measurement. The results revealed that compared to DAC, DTAB displayed a similar and strong collectivity for quartz, and it showed a better selectivity (or worse collectivity) for fluorapatite, resulting in a high-efficiency separation of the two minerals. The surface chemical analysis results showed that the adsorption ability of DTAB on the quartz surface was as strong as that of DAC, whereas the adsorption amount of DTAB on the fluorapatite surface was much lower than that of DAC, which is associated with the flotation performance. During the floatation separation of the actual ore, 8wt% fluorapatite with a higher grade can be obtained using DTAB in contrast to DAC. Therefore, DTAB is a promising collector for the high-efficiency purification and sustainable utilization of valuable fluorapatite recourses.
研究领域:
矿物加工工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Xiaoxiao Qiao,An Liu,Zhihong Li,Jinchuan Fan,Panpan Fan,Minqiang Fan
Dodecylamine (DDA) can only be used with acidification in the reverse flotation of iron ore. To solve this problem, this paper proposed a novel water-in-oil microemulsion with DDA prepared using one or two of AEO-3, OP-10, and Tween-80 & Span-80 as the surfactants, 2-octanol as the cosurfactant, and DDA and kerosene as the oil phase. The freezing point, surface tension, droplet size distribution, and zeta potential were determined for the DDA microemulsion. The results showed that the freezing point of the produced DDA microemulsion can be reduced to –12.5 °C. Moreover, the surfaces of its droplets dispersed in aqueous solution are positively charged at pH values less than 10.0. The flotation performance of the DDA microemulsion was investigated by flotation tests. From the results, DDA microemulsion exhibited good dispersibility and surface activity, thereby confirming its ability to effectively reduce air–water interfacial tension. In addition, it was found to have good adaptability to temperature and pulp pH, yielding a magnetite concentrate with 68.54% Fe and 3.60% SiO 2 from magnetite with 64.93% Fe and 9.12% SiO 2 using 45 g/t DDA microemulsion. Therefore, the proposed DDA microemulsion can be used as an efficient collector in the reverse flotation of magnetite.
研究领域:
矿物加工工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2023
·Vol. 13
·期 10
·1322
·
IF 2.5
Xiaoliang Zhang,Yangge Zhu,Zhiqiang Zhao,Peilong Wang
Dolomite, a prominent calcium-bearing gangue mineral found in carbonate-type zinc oxide ores, poses a significant challenge for effective flotation separation alongside smithsonite due to their highly similar surface properties. The present study explores the potential of 2-(4,4-dimethylpentan-2-yl)-5,7,7-trimethyloctanoic acid (2-DMPT) as a collector for the reverse flotation of smithsonite from dolomite. Micro-flotation experiments indicated that saponified 2-DMPT exhibited superior collecting ability and selectivity for dolomite over smithsonite under highly alkaline conditions. Specifically, the flotation recovery of dolomite reached 62%, whereas only 6% of smithsonite was recovered in the flotation foam products. Zeta potential and attenuated total reflectance–Fourier transform infrared (ATR-FTIR) analysis revealed that changes in pH values had minimal influence on the collector’s adsorption onto dolomite, while significantly hindering its adsorption on the smithsonite surface. Furthermore, X-ray photoelectron spectroscopy (XPS) analysis showed that 2-DMPT could form hydrophobic complexes with the active Ca2+sites on the dolomite surface at pH 11.5. However, the interaction between smithsonite and carboxylic groups of 2-DMPT under the same conditions was relatively weaker, facilitating their reverse flotation separation. As a result, 2-DMPT shows promise as a potential collector for the reverse flotation process, effectively removing dolomite from smithsonite and reducing acid consumption in subsequent acid-leaching processes.Keywords:smithsonite;dolomite;reverse flotation;highly alkaline conditions;saponified 2-DMPT
研究领域:
矿物加工工程
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表面化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）