Mineral Processing and Extractive Metallurgy Review
·
2020
·
IF 2.785
Zhiyong Gao,Jian Deng,Wei Sun,Jianjun Wang,Yunfeng Liu,Fengping Xu,Qinghong Wang
Scheelite and calcite are usually intergrown calcium minerals that are separated via froth flotation. However, their selective separation remains difficult because of their similar surface properties. 2-phosphonobutane −1, 2, 4-tricarboxylic acid (PBTCA or H5L) is widely used in water treatment due to its low phosphorus content and efficient anti-scaling performance. With its excellent calcium-chelating ability, PBTCA was used as a novel depressant to selectively separate scheelite from calcite in this study. The flotation results of single mineral, binary mixed minerals, and real ore showed that PBTCA could selectively depress calcite at pH 9.0 using sodium oleate as collector. The results of zeta potential measurements, solution chemistry calculation, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and density functional theory calculation indicated that the dominant form of PBTCA was L5-. This anion had a stronger adsorption on negatively charged calcite surfaces through electrostatic interaction. Higher Ca density and stronger Ca activity on calcite promote the adsorption of L5-. Moreover, the active O atoms in L5- could better match with two Ca sites on calcite in the interatom distance. Thus, PBTCA provides a new option for calcite depressants and has great industrial application potential.
研究领域:
矿物加工工程
·
表面化学
·
材料科学
✓ 已验证
DOI
高影响因子
CARBONATES AND EVAPORITES
·
2018
·Vol. 34
·期 3
·1131-1139
·
IF 0.947
Li Zhenxuan,Xiao Jiangtian,Huang Lidong,Xu Defu,Liu Dagang,Sun Xiaowen,Yu Luji,Wu Hongsheng
Succinic acid and l -malic acid are known to affect calcite dissolution/crystallization due to their tendency to adsorb on calcite’s surface. Taking into account the structural similarity among succinic acid, l -malic acid, and d -malic acid, a comparative study of their adsorption behavior on calcite was investigated for clarifying their adsorption mechanism. Kinetic results showed that l -malic acid adsorption reached equilibrium within 12 h, while succinic acid required 48 h. Results from the pH effect study showed that the strength of surface complex of succinic acid on calcite was weaker, even compared to its aqueous complex with Ca 2+ ion. Alternately, l -malic acid exhibited a much stronger surface complex strength, even compared to its aqueous complex with Ca 2+ ion. The adsorption isotherm results indicated that the saturated adsorption amount of l -malic acid was twice that of succinic acid, suggesting the surface complex of succinic acid may occupy a larger space on calcite surface compared to that of l -malic acid. Based on these results and those from previous studies, we proposed that succinic acid adsorption is through its two carboxyl groups binding to two adjacent surface sites (> Ca + ), and not only one. Also, l -malic acid adsorption occurs through one carboxyl group and one hydroxyl, which forms a “claw” on calcite surface. The similar adsorption behavior between l -malic acid and d -malic acid reinforces this proposition for l -malic acid adsorption mechanism. Our study will serve as good reference information to provide better understanding into the adsorption of other carboxylic acids on calcite.
研究领域:
地质学
·
化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yuanlin Chen,Xueyi Guo,Yanfei Chen
The flotation separation of smithsonite from calcite is challenging due to their highly similar surface properties. In this study, phytic acid (PA) was applied as a depressant to achieve the flotation separation of smithsonite from calcite for the first time. Micro-flotation experiments indicated that PA showed a strong depressing effect on calcite flotation while a slight effect on smithsonite at pH 9.5. Smithsonite and calcite could be well separated by flotation in the presence of PA and with sodium oleate (NaOL) as collector. Based on a series of tests including zeta potential, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), the selective depressing mechanism of PA was well investigated and explained. It was found that the selective depressing performances of PA on smithsonite and calcite flotation were mainly attributed to the selective adsorption of PA based on the different active sites on minerals surfaces. As for calcite, a high adsorption degree of PA caused by strong reaction with the active Ca + sites exposed on calcite surface inhibited the subsequent adsorption of NaOL. On contrast, the much less PA adsorption occurred on smithsonite surface hardly affected the further adsorption of NaOL. The adsorbed aggregates layer covering on PA-treated calcite surface was also visually observed by atomic force microscope. These findings confirm the excellent selective depressing effect of PA on flotation separation of smithsonite and calcite, providing theoretical and practical reference for the clean flotation of smithsonite.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2020
·
IF 3.795
Tao Wang,Bo Feng,Yutao Guo,Wenpu Zhang,Yibei Rao,Chunhui Zhong,Liangzhu Zhang,Chen Cheng,Huihui Wang,Xianping Luo
The separation of apatite from calcite has been recognized as one of the most difficult subjects in mineral processing owing to their similar surface properties, thus finding high-efficiency depressants become the key for the separation. In this paper, carboxymethyl chitosan was tested as a potential selective depressant in the separation of apatite and calcite using sodium oleate (NaOL) as a collector. Contact angle measurements, adsorption tests, zeta potential tests, FTIR analysis and XPS analysis were performed to explain the selective depression mechanism of carboxymethyl chitosan. The micro-flotation experiment indicated that carboxymethyl chitosan had significantly depression effect on calcite but had a little influence on apatite at pulp pH 9. A series of mechanism tests show that the carboxymethyl chitosan adsorption quantity on calcite surface more than that on apatite surface, which is due to that carboxymethyl chitosan adsorbed on apatite surface by hydrogen bonding, while absorbed on calcite surface mainly through chemical chelating between Ca on mineral surface and –COO − on the depressant. Moreover, both apatite and carboxymethyl chitosan are negatively charged, strong electrostatic repulsive force and steric hindrance between carboxymethyl chitosan and apatite also make the carboxymethyl chitosan adsorb on apatite surface more difficult. These adsorption differences lead to the flotation separation of the two minerals.
研究领域:
矿物加工工程
·
材料科学与工程
✓ 已验证
DOI
高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2020
·
IF 3.706
Rukuan Chai,Yuetian Liu,Qianjun Liu,Wenhuan Gu
The mechanism of calcite-organic molecule-water interaction mechanism in oil-wet formation and alteration of carbonates is still ambiguous. This paper combines atomic force microscope (AFM), X-ray photoelectron spectroscopy (XPS) and molecular dynamic (MD) simulation to investigate the regularity and mechanism of calcite-organic molecule-water interaction at the molecular scale. First, the calcite-organic molecule-water interaction regularities, i.e., wettability alteration process, were studied using AFM, XPS and MD. AFM, XPS and MD results all demonstrated that acetic acid adsorbs stably on the calcite surface and can-not be displaced by water molecules, while the resistance to water displacement of the other three organic molecules decreased with decreasing molecular polarity. Subsequently, MD was used to analyze the calcite-organic molecule-water interaction mechanism from three perspectives, including the organic molecule-calcite interaction, the organic molecule-organic/water molecule interaction, and the effect of polar molecules. In the organic molecule-calcite interaction, the adsorption intensity of organic molecules on calcite surface decreases as their molecular polarity decreases. Stronger molecular polarity results in tighter adsorption layer and lower adsorption energy. In the organic molecule-organic/water molecule interaction, the interaction intensity increases as the polarity difference between the two molecules decreases. Larger polarity difference causes stronger miscibility and lower interaction energy. For polar molecules effect, the presence of polar molecules stabilizes the non-polar molecules adsorption and diminishes the displacement efficiency of water molecules. Consequently, this paper proposes the bulk adsorption mechanism to reasonably explain the wettability formation and alteration mechanism of calcite surface, which is of great importance for targeted enhanced oil recovery studies.
研究领域:
地质学
·
化学
·
分子生物学
✓ 已验证
DOI
高影响因子
DESALINATION
·
2017
·
IF 5.527
Yan Ji,Yun Chen,Jinxun Le,Mengqi Qian,Ying Huan,Wenzhong Yang,Xiaoshuang Yin,Ying Liu,Xurong Wang,Yizhong Chen
Amino trimethylenephosphonic acid (ATMP), nitrilotriacetic acid (NTA) and ethylenedinitrilotetraacetic acid (EDTA) represent the typical phosphonate and carboxylic acid scale inhibitors , respectively. In this study, the performance of the three molecules in inhibiting the formation of calcium carbonate deposition was tested by static tests. We firstly explained the mechanism of these inhibitors on the deposition of CaCO 3 using morphology analysis, crystal testing, molecular dynamics simulation and quantum calculation. We got the conclusion that ATMP showed the outstanding performance of inhibiting the deposition of calcium carbonate, due to its excellent chelate ability with Ca 2 + , the capability of preventing the layer stacking in forming calcite and the unparalleled role of inducing the lattice distortion of CaCO 3 from calcite to vaterite at very low concentration.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Chenhu Zhang,Sun Wei,Yuehua Hu,Honghu Tang,Jiande Gao,Zhigang Yin,Qingjun Guan
Selective adsorption of tannic acid (TA) on calcite surfaces and the implications of this process for the separation of fluorite ore were studied by microflotation tests, surface adsorption experiments, zeta potential measurements, UV–vis analysis, and X-ray photoelectron spectroscopy (XPS) analysis. The microflotation tests indicated that TA, when added before sodium oleate (NaOl), could selectively depress calcite from fluorite at pH 7. Surface adsorption experiments revealed that TA hinders the interaction of NaOl with calcite. The zeta potential of calcite became more negative with TA than with NaOl. However, the characteristic features of TA adsorption were not observed on fluorite, suggesting that the dominant adsorption sites are dissimilar on the fluorite and calcite surfaces in the pulp. UV–vis spectroscopy, XPS, and solution chemistry analysis were utilized to obtain a better understanding of the mechanism for selective adsorption of TA as well as the key factors determined by the Ca 2+ and Ca(OH) + components on the mineral surfaces. A possible adsorption mechanism along with an adsorption mode is proposed for the surface interaction between TA and calcite.
研究领域:
矿物加工工程
·
表面化学
·
胶体与界面科学
·
资源利用
·
浮选化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2025
·
IF 5.2
Na Xue,Yunpeng Zhang,Zongxu Li,Yangge Zhu,Xuejing Liu,Hao Wang,Yimiao Nie,Long Wang
Fluorite commonly coexists with calcite, whilst the separation of these two minerals is a longstanding challenge due to their closely similar surface properties. In this work, froth flotation was adopted to remove calcite from fluorite with tara gum (TG) innovatively performed as the calcite depressant. Flotation experiment results showed that TG exhibited strong depression performance for calcite in a broad pH range (6–8) in sodium oleate (NaOL) system. Zeta potential results confirmed that TG trended to selectively react on the calcite and prevented the function of NaOL onto calcite surface. X-ray photoelectron spectroscopy (XPS) measurement found that TG chemisorbed onto calcite, while physically adsorbed on the fluorite. Atomic force microscopy (AFM) tests indicated that TG densely adhered onto calcite surface and greatly enhanced its hydrophilicity, whereas it adsorbed weakly on the fluorite surface. Molecular dynamics (MD) simulations further concluded that TG could abundantly adhere to the calcite surface with higher intensity and capacity. Therefore, TG exhibited effective depression impact on calcite and achieved the separation of fluorite from calcite successfully.
研究领域:
矿物加工工程
·
表面化学
·
浮选化学
·
计算材料科学
·
胶体与界面科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Bin Yang,Haoran Sun,Donghui Wang,Wanzhong Yin,Shaohang Cao,Yulian Wang,Zhanglei Zhu,Kai Jiang,Jin Yao
Up to now, there is still a great challenge to efficiently separate magnesite from calcium-bearing carbonate minerals, especially dolomite, via froth flotation owing to their similar physicochemical properties. In this investigation, a novel depressant adenosine 5′-triphosphate disodium salt (Na 2 ATP) was introduced into the flotation process using the collector sodium oleate (NaOl), which was proved to be effective for the separation of dolomite and magnesite. The flotation results demonstrate that Na 2 ATP exhibits a more intense depression on the flotation of dolomite than that of magnesite and can separate effectively magnesite from dolomite, which depends on much less NaOl adsorption onto dolomite in the presence of Na 2 ATP. Zeta-potential detection and adsorption amount tests illustrate that the pre-addition of Na 2 ATP strongly interferes with the interaction between NaOl and dolomite so that a more significant reduction in adsorption of NaOl on the surface of dolomite in comparison with magnesite. Moreover, infrared spectral (IR) and X-ray photoelectron spectroscopy (XPS) measurements further confirm that the depressant Na 2 ATP is adsorbed more strongly onto dolomite than magnesite. And the selective adsorption of Na 2 ATP onto dolomite rather than magnesite was mainly due to the strong bonding of its phosphate groups and the calcium sites only exposed to the dolomite surface, resulting in selectively depressing the flotation of dolomite.
研究领域:
矿物学
·
化学工程
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Renlu Liu,Bin Lian
Ubiquitous bio-minerals exert significant effects on the migration and transformation of metal ions in the environment, however, research into the adsorption of heavy metals by biogenic vaterite (BV) has rarely been reported. The aim of our research was to evaluate the removal effects of Cd 2+ , Ni 2+ , and Cu 2+ in single and multi-metal ion aqueous solutions using BV induced by Bacillus subtilis . The results demonstrate that the adsorption data of BV for metal ions are more accurately fitted to the Langmuir model compared with the Freundlich model. The max adsorption capacity (mg/g) order of BV was Ni (270.27) > Cu (178.57) > Cd (172.41) in a single-metal system, and Cu (175.44) > Ni (94.34) > Cd (30.30) in a multi-metal system (pH = 5.0, 2.5 g/L). A competitive effect exists amongst heavy metals in multi-metal ion systems, and Cu 2+ adsorption is less affected by other two ions. Furthermore, BV can maintain favourable adsorption characteristics even in a very strong acidic environment (pH = 3.0), and its adsorptive capability becomes more favourable at higher temperatures. Kinetic analysis shows that the adsorption process can be better described by a pseudo-second-order model. XRD , FTIR, and SEM-EDS results reveal that metal ion adsorption on BV mostly happened through physical means, and the favourable adsorption characteristics of BV might be attributable to its larger specific surface area , aggregated spherical polyporous and organic–inorganic structure.
研究领域:
环境科学
·
地球微生物学
·
生物矿化
·
环境污染与修复
·
水处理技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jie Zheng,Anruo Luo,Yan Jin,Baicheng Feng,Jianhua Chen,Xingrong Zhang
In this study, 5-nonyl salicylaldoxime (5-NSA) was synthesized and used as a malachite collector. Its flotation performances and adsorption mechanism were systematically investigated by micro-flotation experiments, contact angle measurements, SEM-EDS, FT-IR, XPS and DFTB+ simulations. The micro-flotation test results showed that 5-NSA produced high recovery of malachite at pH 9.0–10.0, while showing lower collecting power to calcite or quartz. The contact angle analysis results indicated that the hydrophobicity of malachite surface was promoted after the adsorption of 5-NSA. SEM confirmed the adsorption of 5-NSA on malachite surface. FT-IR and XPS analysis results confirmed that O and N atoms in the oxime group were immobilized on malachite surface with Cu through O Cu O and N Cu O bonding. Their adsorption performances on malachite surface were simulated by DFTB+ method, including 5-NSA, tert -butylsalicylaldehyde oxime (TBSA) and salicylaldoxime agents, which analyzed the bond lengths of their covalent bond formation with Cu and speculated their adsorption properties. In general, according to the experimental test and simulation results, 5-NSA showed a stronger power to malachite than TBSA and salicylaldoxime, and only a small dosage can produce a high malachite recovery. The findings of this research will be helpful to improve the comprehensive utilization efficiency of malachite and promote the metallurgy of copper oxide ores.
研究领域:
矿物加工工程
·
材料科学与工程
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2022
·
IF 5.479
Hongyu Sun,Shuai Wang,Lingyun Fei,Zhanfang Cao,Hong Zhong,Xin Ma
Rhodochrosite is often associated with calcium- and silicon-bearing minerals, resulting in a low grade, and it is difficult to achieve efficient flotation separation with conventional collectors. A novel collector, 2-decanoylamino-pentanedioic acid (DPA), was synthesized by constructing an amide group and double-branched carboxylic acid molecular structure to selectively separate rhodochrosite against quartz and calcite . The flotation results demonstrated that, compared with sodium oleate, DPA exhibited superior collecting performance and enabled the separation of rhodochrosite from quartz and calcite under neutral pH, with no addition of a foaming agent or activator; thus, DPA is regarded as an appropriate flotation collector for rhodochrosite. Analysis of the contact angles, Fourier transform infrared spectroscopy (FTIR), zeta potential and X-ray photoelectron spectroscopy (XPS) results showed that DPA chemically adsorbed on the surface of rhodochrosite, forming 8-membered ring or two 4-membered ring structures. However, no significant interaction was detected on the surface of quartz and calcite, providing evidence for the flotation separation of rhodochrosite from calcite and quartz. This research provides a potential collector for efficient utilization of rhodochrosite.
研究领域:
矿物加工工程
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）