ADVANCED POWDER TECHNOLOGY
·
2023
·
IF 5.2
Shouxing He,Chengwang Wang,Zhihui Cheng,Xingshi Li,Ziwen Si,Yaoguo Huang,Linlin Chen,Yali Zhang
In this paper, 5-methyl hexyldithiocarbamate-1,3,4-oxadiazole-2-thione (MHCODT) was synthesized for the first time and introduced as a flotation collector in malachite flotation separation process from quartz and calcite. During the micro-flotation experiment, it was found that MHCODT showed stronger flotation ability and selectivity for malachite than conventional collector octyl hydroxamic acid (OHA), and achieved effective separation and enrichment of malachite. Measurements of contact angles, ζ-potentials and UV spectra demonstrated that MHCODT specifically adhered to the surface of malachite rather than quartz and calcite. Then, FTIR and X-ray photoelectron spectroscopy (XPS) demonstrated that Cu of malachite surface combined with S and N of MHCODT to form MHCODT-Cu(I) complexes, accompanied by the reduction of divalent Cu. The result of density functional theory (DFT) method indicated that the C S bonds and N H bonds in oxadiazole thione and the dithiocarbamate groups were the chemical reaction center. Based on the above test results, the adsorption models of MHCODT-Cu + and MHCODT-Cu 2+ were proposed.
研究领域:
矿物加工工程
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2024
·
IF 4.9
Guangsheng Zeng,Wei Weng,Shuiping Zhong,Xiaopeng Chi,Jiaozhong Cai,Wen Tan,Junnan Chen
The novel amidoxime-based collectors, 4-pyridylamidoxime (PA), 3-ethyl-4-pyridylamidoxime (EPA), and 3-methyl-5- tert -butyl-4-pyridylamidoxime (MBPA), were introduced in the lead-free flotation separation of wolframite from quartz and calcite. Compared with PA, EPA, and the traditional collector benzohydroxamic acid (BHA), MBPA exhibited a better separation and recovery capacity to wolframite ore. 4.0 × 10 -4 mol/L MBPA recovered more than 80 % wolframite, ∼24 % calcite, and ∼ 26 % quartz at pH 8.0 without Pb 2+ ions. Under the same conditions, BHA only floated out less than 35 % wolframite. The adsorption amount results exhibited a stronger adsorption ability of MBPA than BHA on wolframite surface. Further, the results of zeta-potential, FTIR, XPS and density functional theory (DFT) calculation revealed that MBPA could chemisorb on wolframite surface to form −N-Fe and −O-Fe bonds. MBPA had stronger electron-donating ability and weaker electron-accepting ability than BHA, which exhibited higher reaction activity. It was clear that MBPA was an excellent collector in the lead-free flotation separation of wolframite from calcite and quartz.
研究领域:
矿物加工工程
·
材料化学
✓ 已验证
产品关联
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhenlei Wang,Tingting Zhang,Yunliang Zhao,Yanhui Miao,Lingjie Zhang,Damiano Sarocchi,Shaoxian Song,Qiwu Zhang
Large scale of Cd-contaminated soil has become a serious threat to environmental safety and human health, whereas field applicability of existing remediation technologies has encountered numerous obstacles, such as poor stability, secondary pollution, long operation time, and high chemical cost. Herein, a novel activated calcite with significantly enhanced immobilization stability of Cd in soil has been synthesized based on mechanochemical technology. Our results demonstrate that the passivation rate of bioavailable Cd in Cd-contaminated soil (initial concentration 3 mg/kg) could be maintained at 65 % after 50 days of passivation cultured with activated calcite. Mechanistic studies have revealed that the outstanding performance is attributed to the enhancement of the CO 3 2– and Ca 2+ release properties of calcite through mechanical activation, leading to a 550 % increase in Ca 2+ release. The CO 3 2– fraction binds in situ to the free Cd in the soil, forming a stable carbonate-bound state. Simultaneously, the OH – released from the continuous hydrolysis of CO 3 2– effectively regulates and stabilizes the soil pH within the neutral range. Further, SEM-EDS and sequential extraction procedures (SEP) analyses implied that the specific adsorption of Cd by in-situ formed iron oxides in soil was visibly related to the release of OH – from activated calcite and immobilized the free state Cd in the more stable iron oxide-bound state. The current work shows the high sustainability and stability of Cd-contaminated soil immobilization by activated calcite materials.
研究领域:
环境科学
·
土壤修复
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jingyang Shi,Jing Lv,Jieliang Wang,Zhao Cao,Yongsheng Sun,Jiali Wang,Wenda Lu,Yongdan Cao,Jiayan Tang,Xiaoping Wang
Hydrolytic polymaleic acid (HPMA) was used as a highly selective depressant instead of water glass to achieve the flotation separation of parisite from calcite and fluorite. The inhibitory effect and mechanism of HPMA on fluorite and calcite was investigated using micro-flotation, zeta potential, contact angle measurements, adsorption measurements, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and quantum chemical calculations. The results from single and artificially mixed minerals showed that parisite could be successfully separated from calcite and fluorite by using HPMA as a depressant. Further analysis revealed that HPMA chemically adsorbed onto the Ca 2+ active sites of calcite and fluorite, forming a hydrophilic compound, Ca(COOR), which prevented the octyl hydroxamic acid (OHA) collector adsorbing on their surfaces. In contrast, HPMA only weakly physically adsorbed onto the surface of parisite, allowing it to maintain good floatability after conditioning with HPMA. Therefore, HPMA has a potential as an inhibitor for effectively separating parisite from fluorite and calcite in rare earth ore flotation process.
研究领域:
矿物加工工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Chang Shen,Xiong Tong,Jing Qi,Xian Xie,Ruiqi Xie
TAMOLL selectively adsorbed on the surface of calcite. • Using TAMOLL can effectively separate cassiterite from calcite. • The S-O - and S=O groups in TAMOLL chemically interacted with the Ca sites on calcite. The flotation separation of cassiterite from calcite has long been a challenge. In this study, the eco-friendly depressant sodium poly(naphthaleneformaldehyde sulfonate) (TAMOLL) was employed. Single-mineral tests demonstrated that TAMOLL strongly depressed calcite while barely affecting cassiterite. In the artificially mixed mineral system, a cassiterite concentrate grading 66.69% with a recovery of 86.59% was obtained at 16 mg/L TAMOLL. Multi-technique characterization, including contact angle, zeta potential, FTIR, XPS, and ToF-SIMS, combined with DFT calculations, systematically elucidated the selective depression mechanism. The sulfonate groups (−SO 3 - ) of TAMOLL coordinate with Ca sites on calcite via S-O - and S=O bonds, accompanied by pronounced electron transfer and orbital hybridization, forming stable S-O-Ca bonds. This leads to a dense, hydrophilic film on calcite, whereas TAMOLL adsorption on cassiterite is negligible, substantially widening the floatability difference. Consequently, cassiterite can be effectively floated by the subsequent NaOL collector. The strong chemisorption between TAMOLL and calcite is therefore the core mechanism, endowing TAMOLL with outstanding selective depression performance in cassiterite-calcite separation. Download: Download high-res image (201KB) Download: Download full-size image
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Zheyu Huang,Jingzhong Kuang,Tingsheng Qiu,Mingming Yu
Metal-phenolic networks (MPNs) offer a promising, environmentally compatible strategy for cleaner, more efficient tungsten resource utilization due to their tunable structures and efficient interfacial regulation. This paper investigates the structural regulation effect of a self-assembled Fe(Ⅲ)-tannic acid (TA) MPN, formed through the coordination of TA and Fe 3 + , on the flotation separation of scheelite and calcite. The adsorption mechanisms were elucidated through contact angle, adsorption capacity, zeta potential and XPS analyses, while TEM, UV–vis spectroscopy and DFT calculations were employed to probe the micro- and coordination structures. The results demonstrated that the Fe(Ⅲ)-TA MPN formed at pH= 4 with TA:Fe= 1:1/2 exhibited minimal inhibition of scheelite but strong suppression of calcite, yielding a tungsten concentrate with a WO 3 grade of 71.35 % and recovery of 86.94 %. This behavior was attributed to the formation of a mono-coordination network (Fe:TA=1:1), which adsorbed onto both mineral surfaces through Fe-mediated interactions. In contrast, the tris-coordination network (Fe:TA=1:3) displayed the highest intrinsic reactivity but was limited by Fe(OH) 3 colloid deposition, hindering collector adsorption. The bis-coordination network (Fe:TA=1:2) remained stable over pH= 3–8 and selectively adsorbed on calcite via synergistic electrostatic attraction, hydrogen bonding, and chemical bonding, forming stable hydrophilic films. However, strong electrostatic repulsion hindered Fe(Ⅲ)–TA MPN adsorption on scheelite, thus maintaining its floatability. This study elucidates the structure-function relationship of Fe(III)-TA MPNs, offering new perspectives for designing environmentally friendly inhibitors for selective tungsten flotation.
研究领域:
矿物加工
·
表面化学
·
配位化学
·
环境化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 5
·1056-1067
·
IF 7.2
Guan Zhenhao,Zhang Ying,Wen Shuming,Zuo Qi,Wu Yu,Li Xiaokang
This study investigated the effect of konjac glucomannan (KGM) on the flotation separation of calcite and scheelite. Microflotation tests showed that under the action of 50 mg/L KGM, the floatability of calcite notably decreased, while the impact on scheelite was negligible, resulting in a recovery difference of 82.53%. Fourier transform infrared (FTIR) spectroscopy and atomic force microscopy (AFM) analyses indicated the selective adsorption of KGM on the calcite surface. Test results of the zeta potential and UV-visible absorption spectroscopy revealed that KGM prevented the adsorption of sodium oleate on the calcite surface. X-ray photoelectron spectroscopy (XPS) analysis further confirmed the chemical adsorption of KGM on the calcite surface and the formation of Ca(OH) 2 . The density functional theory (DFT) simulation results were consistent with the flotation tests, demonstrating the strong adsorption performance of KGM on the calcite surface. This study offers a pathway for highly sustainable and cost-effective mineral processing by utilizing the unique properties of biopolymers such as KGM to separate valuable minerals from gangue minerals.
研究领域:
矿物加工工程
·
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Tao Huang,Longfei Liu,Shuwen Zhang
Hexavalent chromium (Cr(VI)) is a well-known carcinogen, which must be completely removed from the contaminated water or reduced to a less toxic state. In this work, a bio-electrochemical platform combining electrokinetics (EK) and microbially induced calcite precipitation (MICP) was assembled to enhance Cr(VI) removal from the stocking solution. The chromate was removed mainly by the chemical precipitation of CaCrO 4 and further immobilized by CaCO 3 produced from the microbial bio-mineralization in the bioremediation. The coupling method was proved to be more effective in increasing the removal efficiencies of Cr(VI) and enhancing the immobilization of Cr(VI) compared with using bioremediation or electrokinetics alone. The maximum efficiency of 97.63% was achieved in the bio-electrochemical experiments. The exchangeable fraction of Cr(VI) was significantly reduced from 40.12% to 22.34% in the precipitation obtained from the bio- electrochemical system. A relatively high voltage was preferred in the coupling system. Generally, the combination of EK and MICP not only strengthened the removal of Cr(VI) from the solution and also significantly reduced the potential re-release of Cr(VI) in the final precipitation.
研究领域:
环境工程
·
生物修复
·
电化学
·
微生物矿化
·
水处理
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Shuo Yan,Yun Li,Jilin Cao
The calcium nitrate (Ca(NO 3 ) 2 ) waste generated from the production of nitrophosphate fertilizers brings about serious environment and human health issues. Using Ca(NO 3 ) 2 waste and ammonium bicarbonate (NH 4 HCO 3 ) fertilizer as raw materials, higher-value spherical calcite mesocrystals have been synthesized via precipitation method. The synthesis conditions are optimized from the aspects of dispersant, crystal control agent and reaction temperature, and the mechanism that regulates the size and morphology of calcite is illustrated. The synthesized spherical calcite mesocrystals exhibit the small particle size of ca. 5 µm and high specific surface area of 84.44 m 2 /g. Under the dispersion effect of polyvinylpyrrolidone, the adsorption of crystal control agent citric acid on the calcite particles results in the formation of the spherical mesocrystal morphology. The yield of calcite in this process could reach 94.3%. Ca 2+ ion remaining in the mother liquor are further removed in the form of CaCO 3 by addition of calcium oxide , and a mixture of ammonium nitrate and a small amount of NH 4 HCO 3 is obtained by concentrating the filtrate, which can be used as nitrogen fertilizers. This work provides a new insight into the low-cost synthesis of spherical calcite mesocrystals with the high specific surface area and the comprehensive utilization of Ca(NO 3 ) 2 waste.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2022
·
IF 5.479
Long Wang,Weijian Lyu,Fuping Li,Jiaxin Liu,Hao Zhang
The efficient flotation separation of apatite and calcite is an intricate problem due to their similar physicochemical properties. The selection and utilization of selective depressant is the key to address this obstacle. In this study, sodium alginate (NaAl) was introduced as a selective inhibitor in the flotation separation of apatite from calcite with sodium oleate (NaOL) as collector. The inhibitory performance of NaAl on these two minerals was investigated via flotation tests. The depressing mechanism of NaAl was studied through zeta potential analysis, adsorption capacity tests, Fourier transform infrared spectroscopy (FTIR) measurements and X-ray photoelectron spectroscopy (XPS) analysis. Flotation results indicated that NaAl demonstrated strong inhibitory impact on the calcite flotation, whereas it presented little influence on the apatite flotation in the pH range of 9–12. A concentrate with P 2 O 5 grade and recovery of 34.32% and 82.27% respectively was obtained in the bench-scale flotation experiment. Zeta potential analysis demonstrated that NaAl strongly affected the following NaOL adsorption onto the calcite surface, whereas it showed little influence on apatite. Adsorption test showed that NaAl absorbed on both these two mineral surfaces, whilst the adsorption amount on the calcite surface was significantly higher than that on the apatite surface. FTIR and XPS analyses further confirmed that NaAl adsorbed on the apatite surface through weak physical adsorption, while it chemically adhered on calcite in the form of calcium carboxyl which greatly prohibited the subsequent adhesion of NaOL on calcite. As a consequence, the calcite floatability was greatly depressed by NaAl and the selective flotation separation of apatite from calcite was realized.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yijiang Li,Chen Chen,Wencheng Xia,Yujin Sun,Hongxin Qiu
In this study, in-situ flocculation kinetics tests, fourier transform infrared spectroscopy and DFT theoretical calculation were used to analyze flocs properties of calcite flocs under combination of sodium alginate and AlCl 3 /polyaluminum chloride (PAC) and their adsorption mechanism. The results showed that the average size of calcite flocs treated with AlCl 3 -sodium alginate was smaller than that of flocs treated with PAC-sodium alginate. The number of residual fine particles in the slurry treated with AlCl 3 -sodium alginate was more than that in the slurry treated with PAC-sodium alginate. However, the fractal dimension of calcite flocs treated with AlCl 3 -sodium alginate was larger than those treated with PAC-sodium alginate. The sodium alginate and Al 3+ could form chemical adsorption on the calcite surface. AlCl 3 has a higher content of Ala than PAC. Ala could form chemical adsorption between sodium alginate and calcite, resulting in a high strength and fractal dimension of calcite flocs. Alb and Alc was not easily able to form metal bridges between calcite and sodium alginate. The sweep effect of PAC and sodium alginate leads to the formation of large-sized flocs. This work can promote the supplication of sodium alginate as a green flocculant.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）