MINERALS ENGINEERING
·
2021
·
IF 4.765
Zheyu Huang,Jingzhong Kuang,Luping Zhu,Weiquan Yuan,Zhilei Zou
The effect of ultrasound on the solution properties and microstructure of benzohydroxamic acid (BHA) were investigated to separate scheelite from calcite effectively in this study. The influence of ultrasound-treated BHA on flotation kinetics, surface properties and the adsorption heat of reagents and minerals was discussed. The results show that the difference in the flotation rate between scheelite and calcite was significantly increased by ultrasound-treated BHA. The grade and recovery rate of tungsten concentrate were increased and the flotation time was reduced, which resulted in the rapid separation of scheelite and calcite. Ultrasonic effects significantly increased the adsorption amount, adsorption rate and contact on the surface of scheelite with BHA, which have no noticeable effects on the surface of calcite. The adsorption heat of the interaction between BHA and scheelite was significantly increased by ultrasound due to the increase in the adsorption rate of scheelite on BHA. The ultrasonic effect promotes the dissociation of BHA in solution and the formation of a fine droplet structure, reduces the surface tension, resulting the decrease in the adhesion work and induction time between BHA and scheelite.
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
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
ADVANCED POWDER TECHNOLOGY
·
2024
·
IF 4.2
Shiman Zhu,Liuyi Ren,Shenxu Bao,Yimin Zhang,Bo Chen
The flotation separation of fine minerals, including rutile, has long been a challenging research focus. This study selected rutile and garnet samples with size fractions of −15, −38, and −74 μm to investigate the impact of particle size on flotation separation. Infrared spectroscopy, Zeta potential analysis, adsorption capacity measurements, and high-speed camera were utilized to analyze the mechanism. Results indicate that a high-grade concentrate with recovery of 92.33 % was achieved by mixing −74 μm rutile and −15 μm garnet in a 1:1 ratio. Benzohydroxamic acid (BHA) collector primarily chemisorbs onto the surface of rutile particles. BHA's adsorption capacity on each particle size's rutile surface is significantly higher than that of garnet. Meanwhile, sodium fluorosilicate (SSF) exhibits the strongest inhibitory effect on −15 μm garnet particles. Additionally, adhesion between bubbles and −74 μm rutile is much stronger than that between bubbles and fine particles overall. These findings have significant reference value for improving eclogite-type rutile ore's fine particle separation.
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
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yuanbo Zhang,Hua Chen,Zijian Su,Zhidong Jiang,Kaiao Shen
Tin is a strategically important metal used in electronics, alloy manufacturing, and renewable energy. Approximately 80 % of global tin production is derived from cassiterite (SnO 2 ) beneficiation; The reserves of high-quality tin ore are gradually decreasing, and the research focus on tin extraction is shifting toward the recycling and reuse of tailings. However, tin and iron in tin–iron tailings are strongly intergrown, making separation challenging. Previous studies have demonstrated that a calcination roasting–magnetic separation process under a CO/CO 2 atmosphere can convert iron into Fe 3 O 4 , thereby leaving tin in the form of nonmagnetic calcium stannate (Ca 2 SnO 4 ) to achieve effective tin–iron separation. Nevertheless, the tin content in the nonmagnetic fraction is only 0.5–1.0 %, which is far below the economic threshold for recovery by fumigation. Therefore, innovative pre-enrichment strategies are urgently needed to improve tin recovery efficiency. This study explores the feasibility of flotation of synthetic calcium stannate (Ca 2 SnO 4 ) using two commonly employed collectors: sodium oleate (a representative fatty acid) and benzohydroxamic acid (a typical hydroxamic acid). The recovery performance of calcium stannate (Ca 2 SnO 4 ) was evaluated by micro-flotation tests, and the chemical interactions induced by collector adsorption, as well as the adsorption mechanism, were elucidated in depth employing FTIR, XPS, and DFT simulations. The results reveal that NaOL, with its strong ligand bonding under alkaline conditions, substantially boosts flotation recovery-reaching up to 83.56 %. These findings offer practical guidance for optimizing flotation processes in tin recovery from the tin-bearing tailings.
研究领域:
矿物加工工程
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材料科学
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计算化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Mengke Li,Jieyi Wang,Hairong Shen,Zhiguo He,Hui Zhong,Wei Sun,Mingqiang Ye,Yetao Tang
The organometal complexes pollution in beneficiation wastewater has aroused increasing attentions because they were difficult to remove by traditional technologies. In this study, eleven kind of benzohydroxamic acid (BHA)-metal (Pb 2+ , Cu 2+ , Mg 2+ , Ca 2+ , Zn 2+ , Cd 2+ , Fe 3+ , Fe 2+ , Sb 3+ , Cr(Ⅵ) and As(V)) complexes were chosen to investigate their removal performance and mechanism in heterogeneous persulphate degradation system. The metal-biochar/peroxymonosulfate (PMS) system showed the highest and worst total organic carbon (TOC) removal efficiency for BHA-Fe 2+ (68.4%) and BHA-As(V) (22.8%), respectively. Meanwhile, the metal-biochar composite had different immobilization abilities toward multiple metal ions. Density functional theory (DFT) revealed that ΔG values of various BHA-metal complexes played key roles for TOC removal. While, metal adsorption was mainly depended on the functional groups on the catalyst surface. After the reaction, Cu, Pb, Fe, Sb, Cr and As mainly existed as residuals. Overall, this study has provided valuable and novel insights into the removal of BHA-metal complexes and broadened the practical applicability of the waste solid-based metal-biochar catalyst coupled with persulphate in beneficiation wastewater treatment.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
MOLECULES
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2012
·Vol. 17
·期 9
·10994-11009
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IF 2.386
Yunxia Zhang,Yunlan Li,Qingshan Li
The specific aims of this study were to evaluate the inhibition effect on CYP3A of di-n-butyl-di-(4-chlorobenzohydroxamato)tin (IV) (DBDCT), a tin-based complex with high antitumor activity, and the probable mechanism(s) of this action. Adult male SD rats were treated separately with natural saline (NS), lipopolysaccharide (LPS, 5 mg/kg), DBDCT (1.25, 2.5 and 5.0 mg/kg) intraperitoneally for 2 days after induction of CYP3A with dexamethasone (DEX, 100 mg/kg) for 4 days. Western blot analysis and fluorescent quantitation PCR (FQ-PCR) were conducted to determine the changes in expression of CYP3A, PXR, CAR and RXR. The biological accumulation of DBDCT and total Sn were determined by high-performance liquid chromatography (HPLC) and atomic fluorescence spectrometry (AFS). CYP450 content and CYP3A activities were significantly inhibited (p< 0.05) in DBDCT-treated rats compared with the control group, as was the expression of CYP3A (p< 0.05) at both protein and mRNA levels. In DBDCT-treated groups, the expression of PXR protein and mRNA increased, while the expression of CAR decreased. The biological accumulation of DBDCT and Sn in rat livers treated with DBDCT was high. The accumulation of DBDCT and Sn due to the inhibition of CYP3A may be involved in the mechanism of toxicity of DBDCT in rat liver.Keywords:cytochrome P450 3A (CYP3A);di-n-butyl-di-(4-chlorobenzohydroxamato)tin (IV) (DBDCT);inhibition;rat
研究领域:
药理学
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毒理学
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分子生物学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Miao Cao,Hao Bu,Qingbo Meng,Yude Gao
Ta and Nb are listed in the category of strategic metals. Columbite-tantalite is the most abundant Nb- and Ta-containing mineral. The flotation is a promising method for fine columbite-tantalite recovery. However, few studies have been performed on the surface modification and enhanced flotation recovery of columbite-tantalite in presence of benzohydroxamic acid (BHA). This study systematically investigates the surface modification of columbite-tantalite by Pb 2+ ions and its effect on columbite-tantalite flotation with BHA as collector. The results show that the Pb 2+ modification enhances the adsorption of BHA on the columbite-tantalite surface, increases its hydrophobicity , and consequently improves floatability. Zeta potential measurement and X-ray photoelectron spectroscopy (XPS) analysis reveal that the Pb ionic species (Pb 2+ and PbOH + ) interact with the columbite-tantalite surface via electrostatic attraction and chemical interaction, generating new active products on the mineral surface, i.e., –O–Pb complexes. The –O–Pb complexes exhibit strong reactivity toward BHA subsequently introduced into the flotation pulp. This leads to a significant improvement in the chemisorption of BHA on the Pb 2+ -modified columbite-tantalite surface. As a surface modification method, introducing Pb 2+ ions can effectively activate the columbite-tantalite surface and increase its floatability.
研究领域:
材料科学
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矿物加工
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2014
·
IF 2.041
Yunlan Li,Pu Guo,Niu Lin,Qingshan Li
Di-phenyl-di-(2,4-dichlorbenzohydroxamato) tin (IV) (DPDCT), a new diorganotin (IV) arylhydroxamate, has been reported to show high in vivo and in vitro antitumor activity with relatively low toxicity, but no data are available regarding its pharmacokinetics. In this paper, a selective high-performance liquid chromatography (HPLC) method was developed and validated for the determination of DPDCT in plasma. The separation was achieved by HPLC on a Diamonsil C18 column with a mobile phase composed of methanol/0.5% phosphoric acid (28:72, v/v, pH 3.0) and the detector set at 228 nm. Good linearity was found between 0.1 and 15.0 μg/ml ( r = 0.9992). A non-compartmental method was used to determine all plasma profiles. The pharmacokinetic parameters of DPDCT were also compared to data obtained for total tin by using nonselective atomic absorption spectrometry (AAS). The use of selective analytical techniques is strongly recommended for obtaining the kinetic parameters of the intact compound after single intravenous administration to rats instead of that of the complex mixture of tin containing endogenous compounds. The differences in the area under the curve (AUC), half-life ( t 1 / 2 ), and mean residence time (MRT) values for intact DPDCT and total tin showed notable statistical significance, indicating that intact DPDCT was transformed into (tin)-containing metabolites.
研究领域:
药理学
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肿瘤学
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分析化学
✓ 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）