Minerals
·
2022
·Vol. 12
·期 8
·920
·
IF 2.818
Qingchao Zhou,Chengsi Wang,Andy-Hsitien Shen
Owing to the high market values of natural sunstones in Oregon, a kind of artificially diffused red feldspar exhibited at the Tucson Exhibition at the beginning of this century, whose color origin is the same as that of natural sunstone (copper nanoparticles). However, the details of the artificial diffusion process are less disclosed, there is no systematic method to obtain such gemstones. In this paper, we developed the high-temperature copper diffusion process for the surface recoloring of faceted labradorites, which are partly buried in the diffusant. By optimizing the experimental parameters of high-temperature copper diffusion, we successfully recolored the faceted labradorites to red and light red. The gemological and spectroscopic characteristics of the recolored faceted labradorite were further characterized. The red and light-red faceted labradorites exhibited the unique surface plasmon resonance absorption peaks of copper nanoparticles near 580 nm, which is the origin of red color. The typical inclusions formed in the faceted labradorite is in the shape of “fire cloud”. The interface of red and light-red faceted labradorite that is in contact with the diffusant is less contaminated, we believe that the contamination could be further reduced or eliminated by optimizing the high-temperature copper diffusion process. The way that the sample is in contact with the diffusant partly is versatile and promising in the surface treatment of materials that have already been processed.Keywords:labradorite;faceted;copper diffusion;recoloring
研究领域:
矿物学
·
宝石学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Danzhang Liu,Xiaoqing Weng,Yanfeng Jin,Richard M. Kasomo,Shunfu Ao,Hongqiang Li
Feldspar is a typical sesquioxide which is associated with phosphate ore. It can greatly prevent the formation of calcium sulfate crystals during the wet process of phosphoric acid production, resulting in the loss of P 2 O 5 , and therefore lowering the phosphoric acid recovery. To achieve the selective separation of feldspar from phosphate ore, we first tried using a new Gemini quaternary ammonium salt as the collector in conjunction with a reverse flotation approach. The flotation tests of single minerals and artificially mixed minerals were employed to investigate the collecting ability and selectivity of the collector, the adsorption mechanism was also evaluated by means of zeta potential measurements and molecular dynamic calculations. The flotation results demonstrate that the collector showed a strong harvesting effect and selectivity on feldspar rather than fluorapatite . When the Gemini concentration was set at 7.5 × 10 −6 mol/L, the P 2 O 5 grade could reach 31.69% with a corresponding recovery of 77.57%, indicating that Gemini collector could suitably be used as a potential chemical to achieve the effective removal of feldspar from phosphate ore. The results obtained from zeta potential measurements and molecular dynamics simulations indicate that the adsorption of Gemini collector on feldspar was more pronounced compared to that on fluorapatite surface and the interaction between Gemini and both minerals was mainly ascribed to electrostatic interaction . This work aims to provide a reference for using Gemini as collector combined with reverse flotation approach to achieve the effective removal of sesquioxide from phosphate ore and further enhance the quality of phosphate fertilizers .
研究领域:
矿物加工工程
·
化学工程
✓ 已验证
DOI
高影响因子
Silicon
·
2019
·Vol. 12
·期 2
·327-338
·
IF 1.21
Wei Mengnan,Ban Boyuan,Li Jingwei,Sun Jifei,Li Feifei,Jiang Xuesong,Chen Jian
A novel green cationic surfactant Poly (propylene glycol) bis (2-aminopropyl ether) (PEA) with multiple amine groups was utilized as a collector for flotation separation of quartz from feldspar-quartz associated ore (FQA) without acid (particularly, HF) and alkali. The collecting performances and the adsorption mechanisms of PEA on the quartz/FQA were investigated through flotation experiments, ICP-OES, XRD, Zeta potential, FTIR and XPS measurements. A remarkable separation of the quartz from FQA has been realized in an environmental friendly way. The froth flotation results show that the flotation recovery of quartz is 97.79% and that of FQA is 19.30% at pH 9.00–9.50 with 10 −4 M PEA when the particle size ranges from 150 to 270 μm. The results of batch flotation, ICP-OES and XRD analyses show that the first flotation product is almost quartz, while more feldspar and little quartz exist in the sink product when compared with the FQA feed. The mechanism of PEA acting as the collector for the separation of quartz/feldspar has been investigated. The PEA is adsorbed on the quartz surface by electrostatic and hydrogen bonding interaction with ─NH 3 + /─NH 2 head groups, while is less adsorbed on the feldspar surface due to electrostatic repulsion between the K + / Na + ions and the positively charged ─NH 3 + /─NH 2 head groups of PEA. A conceptual adsorption model of the PEA cationic collector on the quartz and the FQA surfaces has been proposed.
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
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Xinyan Suo,Bowen Yu,Jinting Sha,Runbo Gao,Mengyao Qi,Yehao Huang,Weijun Peng,Xiao Guo,Wei Wang,Yijun Cao,Chongqing Wang,Yukun Huang
Amine ether was initially used as a novel collector for the direct flotation of quartz to separate the quartz from feldspar under weak alkaline conditions. The flotation results demonstrated that the recovery differences between quartz and feldspar both decreased with the increase in the carbon chain length and number of alkoxy groups of amine ether. A recovery difference of nearly 90 % could be achieved between them at a pulp pH of 8.0 with dodecylamine polyoxyethylene ether (AC1210) serving as the collector. The results of the mechanism analysis demonstrated that AC1210 was effectively adsorbed on the quartz surface via electrostatic interaction and hydrogen bonding. However, the electrostatic repulsion between the K + on the feldspar surface and positively charged NH + groups of AC1210 weakened the adsorption of AC1210 on the surface of feldspar. The difference in the adsorption capacity of AC1210 between the quartz and feldspar promoted the selective direct flotation of quartz from the mixture of quartz and feldspar.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
DOI
高影响因子
Journal of Sustainable Metallurgy
·
2022
·Vol. 8
·期 3
·1117-1129
·
IF 3.068
Lu Xingwen,Zhou Ceng,Liu Yuxin,Wang Yujie,Wang Fei
In this study, iron tailings were used as raw materials mixing with Al 2 O 3 , SiO 2 , and/or CaO sintered at 950–1400 °C to produce glass ceramics. In Al 2 O 3 /tailing and Al 2 O 3 /SiO 2 /tailing systems, the newly formed crystalline mullite (3Al 2 O 3 ·2SiO 2 ) reached its maximum content of 83.7 wt% for sample with Al 2 O 3 /SiO 2 /tailing mass ratio of 6/2/2. In Al 2 O 3 /SiO 2 /CaO/tailing system, the content of newly formed anorthite (CaAl 2 Si 2 O 8 ) increased to the maximum of 72.9 wt% for sample with Al 2 O 3 /SiO 2 /CaO/tailing mass ratio of 7/8/4/6 sintered at 1450 °C. The properties of glass ceramic products were significantly improved in samples with high content of crystalline mullite or anorthite and low surface porosity. Obtained glass ceramic in Al 2 O 3 /SiO 2 /tailing system with mass ratio of 6/2/6 showed excellent properties of chemical resistance (99.99%), compressive strength (1061.6 MPa), and low water absorption (0.2%). The high performance of glass ceramics and low leachability of hazardous metals shed light on the potential application of iron tailings in building and decorative materials. Graphical Abstract
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
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Mengting Jiang,Xiaopeng Li,Tengfei Deng
In this study, aluminum titanate/anorthite (Al 2 TiO 5 -CaAl 2 Si 2 O 8 ) ceramics were fabricated from ferrotitanium slag through phase reconstruction. Stabilization of the ceramic was achieved by migration of Mg element into Al 2 TiO 5 phase. The results indicated that optimal performance was achieved with the addition of 4 wt% MgO and 60 wt% ferrotitanium slag at 1370°C. The ceramic exhibited bulk density of 3.11 ± 0.01 g/cm 3 , thermal storage density of 1.51 kJ/cm 3 , and thermal expansion coefficient of 3.40 × 10 −6 /°C (1000°C), respectively. Additionally, the solid solution of Mg 2+ in the Al 2 TiO 5 lattice reduced the formation of microcracks and enhanced the mass transfer process. Consequently, the sintering temperature decreased from 1415°C to 1370°C while the bending strength increased from 61.25 ± 1.05 MPa to 75.92 ± 7.72 MPa. Furthermore, finite element simulation demonstrated that higher thermal expansion led to concentrated thermal stress, potentially increasing the possibility of ceramic cracking. This research provides a new strategy for preparing low thermal expansion ceramics from titanium-containing solid 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
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Hui Shao,Bingqiao Yang,Huihua Luo,Ruiqi Ge,Jie Wu
In this study, N-OSS combined with DDA was examined as an novel collector. The collecting performances and their synergetic interaction mechanisms were investigated comprehensively. The micro-flotation results illustrated N-OSS/DDA exhibited excellent selectivity on separation without pre-activation. Contact angle tests revealed N-OSS/DDA could selectively enhance the hydrophobicity of spodumene, whereas, they barely affected that of albite. FTIR, SEM-EDS and Zeta potential revealed N-OSS/DDA might co-adsorb on spodumene surface rather than that of albite. XPS analysis and DFT calculations inferred the O 1 2p orbitals of -COO- within N-OSS could bond with Al 3s orbitals and the -NH 3 + groups of DDA adsorbed onto spodumene surface via hydrogen bonding and electrostatic attraction. Meanwhile, the hydrogen bonding between N-OSS and DDA promoted the co-adsorption on spodumene surface. While N-OSS/DDA weakly adsorbed on albite surface through physical adsorption. N-OSS/DDA exhibited outstanding floatability, which maybe a good substitute for conventional collectors in future.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
DOI
高影响因子
International Journal of Mining Science and Technology
·
2023
·
IF 11.8
Haoyong Yu,Yangge Zhu,Liang Lu,Xiaoxing Hu,Songqing Li
This study aims to investigate the effect of a cationic-anionic mixed collector (dodecyltrimethyl ammonium bromide/sodium oleate (DTAB/NaOL) on the selective separation of apatite, dolomite, and potassium feldspar. Herein, several experimental methods, including flotation experiments, zeta-potential detection, microcalorimetry detection, XPS analysis and FTIR measurements, were used. The flotation tests showed that dolomite and potassium feldspar can be successfully removed from apatite simultaneously when the molar ratio of DTAB to NaOL was 2:1 with pH 4.5. Zeta-potential and microcalorimetry detection suggested that NaOL and DTAB were adsorbed on the surface of dolomite and potassium feldspar respectively, and part of NaOL and DTAB formed co-adsorption on the surface of potassium feldspar to enhance the floatability of potassium feldspar. The XPS and FTIR spectra analysis demonstrated that the cationic collector, DTAB, was first adsorbed on the surface of potassium feldspar through electrostatic attraction in the DTAB/NaOL mixture system. Subsequently, the anionic NaOL collector and cationic DTAB collector form an electron neutralisation complex, thereby resulting in co-adsorption on the surface of potassium feldspar. NaOL was chemically reacted and adsorbed on dolomite surface, but almost no collector was adsorbed on apatite surface. Finally, the adsorption models of different collectors on mineral surface were obtained.
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
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Huiwen Ren,Ruiqi Xie,Sheng Jian,Xiong Tong,Xian Xie,Zhihui Zhao,Xuelin Wei
The separation of spodumene and albite by the new collector 12-aminododecanoic acid (12-ADA) without an activator or depressant was investigated by single-mineral and artificially mixed-ore flotation test. The results showed that under the 12-ADA concentration of 314 mg/L, pH 5.0, and 10 °C, the recoveries of spodumene and albite were 12.85 % and 89.15 %, respectively. At the 12-ADA concentration of 114 mg/L, pH 4.5, and 10 ± 2 °C, Li 2 O grade of 4.56 % and recovery of 84.55 % were achieved. In addition, the interaction mechanism between minerals and 12-ADA was investigated. The results showed that 12-ADA could form an association complex, which could create hydrogen bonds with the Si-O bond on the albite surface through NH 2 , and form chemical bonds with Na through COOH. However, 12-ADA mainly adsorbed onto the spodumene surface through electrostatic attraction. With an increase in the concentration of 12-ADA, albite could preferentially adsorb 12-ADA as a monolayer, while the adsorption between spodumene and 12-ADA was small, when 12-ADA exceeded a certain amount, it became prone to multilayer adsorption. 12-ADA overcame the temperature limitation of traditional fatty acid reagents and had potential application value for the flotation of spodumene in cold areas. It also provided a theoretical basis for the research and development of low-temperature reagents for spodumene.
研究领域:
矿物加工工程
·
材料科学与工程
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2016
·
IF 0
Ben Cang Cui,Jing Li,Hui Ning Wang,Yuan Hua Lin,Yang Shen,Ming Li,Ce Wen Nan
Polymer-infiltrated-feldspar used for restorative composite CAD/CAM blocks were prepared by infiltrating polymerizable monomers into the partially sintered feldspar blocks. The flexural strength was tested according to the standard of ISO-4049. The micro-structure was examined by SEM. The effects of sintering temperature, high pressure and the addition of SiO2 and Al2O3 on the ultimate flexural strength were evaluated. The flexural strength corresponding to infiltration with pressure was much higher than that without pressure at high sintering temperature. The addition of SiO2 and Al2O3 into the natural feldspar mineral increased the flexural strength of the blocks significantly.
研究领域:
材料科学
·
牙科医学
✓ 已验证
DOI
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2025
·
IF 4.7
Pan CHEN,Jia-yan LIU,Ji-hua ZHAI,Yao-hui YANG,Wei SUN
n-octylphosphonic acid (OPA) was introduced as a novel collector for ilmenite flotation and its effectiveness was compared with the conventional chelating collector, benzohydroxamic acid (BHA). Micro-flotation tests demonstrated that OPA was a highly effective and selective collector for separating ilmenite from titanaugite over acidic conditions (optimal pH around 3), which was also supported by adsorption amount measurements. X-ray photoelectron spectroscopy (XPS) tests indicated that the chemisorption of OPA onto ilmenite surface was much stronger than that of BHA. Solution chemistry diagram analyses indicated that OPA could dissociate well at pH 3.0 and mostly exist in anion form. DFT calculations further confirmed that OPA was much easier to adsorb onto ilmenite surface with shorter bond length and lower adsorption energy in comparison with BHA. Therefore, OPA maintained good collecting ability and selectivity for ilmenite flotation in the strongly acidic pulp, providing valuable insights into new collector design and development.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xunlong Cheng,Xuran Ding,Jun Wang,Shuai Wang,Hong Zhong,Junhui Wang,Changzheng Wang,Zhanfang Cao,Xin Ma
To address the challenge of difficult flotation separation between spodumene and aluminosilicate minerals, this work synthesized a long-chain carboxylic acid surfactant featuring amide groups, N-Oleoylglycine, as a high-performance collector. Experimental results demonstrate that N-Oleoylglycine exhibits significantly improved collecting power for spodumene compared to conventional sodium oleate, along with superior selectivity in distinguishing spodumene from feldspar. Under optimized conditions (5 × 10 −4 mol/L concentration, pH 7.0), N-Oleoylglycine achieved 89.39 % flotation recovery for spodumene, contrasted with merely 9.78 % for feldspar, highlighting its exceptional separation efficacy. Nuclear magnetic resonance (NMR) analyses reveal that the deprotonated amide nitrogen coordinated with Al 3+ ions on spodumene surfaces. Density functional theory (DFT) calculations further identify the amide and carboxyl groups as the primary functional groups responsible for its collector properties. DFT calculations also predict that in the adsorption configuration of N-Oleoylglycine with Al ions, the Al ions form complexes with the N atom of the amide group and two carbonyl oxygen atoms, respectively Multiple characterization techniques — including contact angle measurements, FTIR spectroscopy, and XPS analysis — collectively substantiated that N-Oleoylglycine achieves selective adsorption on spodumene through synergistic interactions between its amide and carboxyl moieties. Notably, the self-assembly capability of amide groups through intermolecular hydrogen bonds enables ordered collector molecular arrangement on mineral surfaces, suggesting potential for advancing mineral separation technologies.
研究领域:
矿物加工工程
·
材料科学
✓ 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）