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Bench-scale flotation tests indicated that SHA can effectively recover wolframite concentrate with 55.64% WO 3 grade and 75.28% WO 3 recovery from wolframite tailings by the combined shaking table-flotation process. Polarized light microscope observations showed that SHA could promote the formation of hydrophobic …
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A hydroxamic acid derivative (NPOHA) was synthesized and first introduced as wolframite collector.. The chemical reactivity and surface activity of NPOHA were stronger than BHA and OHA.. NPOHA could efficiently separate wolframite from fluorite and quartz, with no activator or frother applied.. NPOHA chemisorbed onto wolframite …
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The oxidation flotation with sodium hypochlorite (NaClO) and N-[(3-hydroxyamino)-propoxy]-N-hexyl dithiocarbamate (HAHD) achieved an effective separation and enrichment of wolframite from calcite, while NaClO and BHA combination delivered an inefficient floatation recovery of wolframite. The flotation mechanism in the HAHD …
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under the conditions of maximum flotation. Key words: wolframite; adsorption; hydroxamate; flotation 1 Introduction Wolframite is the most important tungsten-bearing mineral, which has been mined and processed for a century in China. Because of its crispness property, wolframite slime produced in the comminution process
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The flotation of wolframite using sodium hydroxamate as collector was investigated. The collector-mineral interactions were studied by determining collector adsorption, measuring zeta potentials, acquiring infrared spectra and conducting solution chemistry calculations. A multilayer collector adsorption was determined to be necessary for effective flotation …
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In this study the effects and mechanism of lead ions influence on wolframite flotation with benzohydroxamic acid (BHA) were studied through micro-flotation, adsorption experiments, zeta potential measurements, logarithmic concentration diagram, and X-ray photoelectron spectroscopy. It was observed that lead ions could significantly enhance …
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Flotation tests of the artificial mixture of wolframite and calcite were performed to determine the selectivity of the HAHD and NaClO flotation system, the results are presented in Fig. 2.It indicates that the NaClO and HAHD combination realized the flotation separation of wolframite from calcite, at pH 6.0 ∼ 9.0, their recovery …
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Based on the results of flotation tests, the flotation performances of DOPA to wolframite, fluorite and calcite were examined. Zeta potential and XPS measurements …
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Various reagents suitable for scheelite flotation (collectors and depressants, mostly) are reviewed in the present work, with a strong focus on the …
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The study on flotation of fine wolframite from the Shizhuyuan Mine in China using benzohydroxamic acid combined with fatty acid as the collector revealed that the flotation kinetics of wolframite ...
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CaWO4), stolzite (lead tungstate, PbWO4), and wolframite [(Fe, Mn)WO4]. Tungsten (W) production is dominated by China (~80%), the country having the largest tungsten …
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The study on flotation of fine wolframite from the Shizhuyuan Mine in China using benzohydroxamic acid combined with fatty acid as the collector revealed that the flotation kinetics of wolframite ...
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Interaction mechanism of fine wolframite with octyl hydroxamic acid (OHA) during flotation process was investigated. Flotation and adsorption tests indicated that wolframite showed better floatability as a consequence of OHA adsorption at pH 7.0-10.0. Zeta-potential measurements revealed that OHA adsorbed specifically on wolframite surface. The …
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Then, the sedimentation cylinder was inverted, shaken 10 times, and left to stand for 3 min, and 20 mL of the upper layer of the sedimentation cylinder was extracted to perform a turbidity measurement. ... Study on the activation mechanism of lead ions in wolframite flotation using benzyl hydroxamic acid as the collector. Miner. Eng., 141 …
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The results showed that with an increasing Fe/Mn ratio, the flotation recovery of wolframite increased when using benzohydroxamic acid (BHA) as collector, …
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The surface modification of wolframite by Pb 2+ ions and its influence on the flotation of wolframite using a salicylhydroxamic acid (SHA) collector were investigated through microflotation experiments, contact-angle tests, zeta-potential measurements, atomic force microscopy (AFM), Fourier transform infrared spectroscopy …
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The flotation and adsorption mechanism of wolframite with low-toxic copper ion in the presence of α-hydroxyoctyl phosphinic acid (HPA) were investigated to reduce …
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The flotation of wolframite using sodium hydroxamate as collector was investigated. The collector-mineral interactions were studied by determining collector adsorption, measuring zeta potentials, acquiring infrared spectra and conducting solution chemistry calculations. A multilayer collector adsorption was determined to be necessary …
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The model optimization results of Pb(II) adsorption of H 2 Os show that the adsorption of 2 and 5 H 2 Os on Pb(II) is unilateral. That is, the adsorbed H 2 Os are distributed in the same hemisphere space of Pb(II), which is consistent with the conclusion of literature experiment [16], [17].When the number of adsorbed H 2 Os is more than 5, …
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The flotation enrichment of fine-particle wolframite played a crucial role in production of strategic key metal tungsten. In this paper, N-[(3-hydroxyamino)-propoxy]-N-hexyl dithiocarbamate (HAHD) was designed to strengthen the flotation recovery of wolframite. The in situ AFM images clearly exhibited that the pre-activation of …
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Wolframite is often associated with calcium bearing minerals, leading to low grade, while conventional anionic collectors are hard to realize their efficient flotation separation, thus the effective structural modification of cationic collectors provides a new insight into enhancing the comprehensive development of wolframite resources.
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I Adsorption of octyl hydroxamate on wolframite as a function of pH and its relation to wolframite flotation. (3.1x10-4 M/L initial OHA concentration) As shown in Figure 2, wolframite flotation recovery increased gradually with OHA concentration below 2x10-4 M/L, above which a significant increase in recovery with OHA concentration was …
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Electron donating ability and hydrophobicity are of the two aspects related to flotation performance of a collector. To solve the insufficient collecting power of benzohydroxamic acid (BHA) in tungsten ores flotation, its derivatives p-alkoxyl benzohydroxamic acids (AOBHAs) were designed as the advanced wolframite …
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ABSTRACT The flotation enrichment of fine-particle wolframite played a crucial role in production of strategic key metal tungsten. In this paper, N-[(3-hydroxyamino)-propoxy]-N-hexyl dithiocarbamate…
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A single-factor flotation experiment, high-speed camera analysis, and SEM (Scanning Electron Microscopy) analysis were used to study the influence of microbubbles on the flotation of fine wolframite.
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1. Introduction. Tungsten, as a significant rare metal, is widely used in alloys, electronics and chemical industry due to its high temperature strength and excellent conductivity [1], [2].Wolframite, mainly compose of (Fe, Mn)WO 4, is the principle mineral for extracting tungsten which often associated with quartz (SiO 2), fluorite (CaF 2) and …
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The flotation enrichment of fine-particle wolframite played a crucial role in production of strategic key metal tungsten. In this paper, N-[(3-hydroxyamino)-propoxy]-N-hexyl dithiocarbamate (HAHD) was designed to strengthen the flotation recovery of wolframite. The in situ AFM images clearly exhibited that the pre-activation of wolframite with Pb2+ …
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Wolframite Flotation Activation BHA ABSTRACT The activation mechanism of Pb(II) on the flotation of wolframite was systematically investigated. Micro- o-tation test results showed that Pb(II) effectively improved the flotation of wolframite in the presence of benzyl hydroxamic acid (BHA). Maximum floatability of wolframite was achieved at ...
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@article{Zhao2023TheSR, title={The structure-property relationship of p-alkoxyl benzohydroxamic acids towards wolframite flotation: Theoretical and experimental investigations}, author={Gang Zhao and Sheng Liu and Jing Qi and Liu Yang and Xianyang Qiu and Guangyi Liu}, journal={Journal of Molecular Liquids}, year={2023}, …
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We once assisted a wolframite ore processing plant in Son La province, Vietnam in configuring processing equipment. The wolframite ore here contains small …
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