Hydroxamic Acids as Chelating Mineral Collectors

Natarajan, Ramalingam

doi:10.1007/978-3-642-38111-9_11

Cited by 3 publications

(3 citation statements)

References 69 publications

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“…As mentioned previously, hydroxamic acid collectors are associated with low collection capacity and high costs [31][32][33]. Moreover, fatty acids have low dispersity and need to be heated in the flotation process [8].…”

Section: Introductionmentioning

confidence: 99%

Composite Collectors for the Flotation of Refractory Alkaline Rock-Type Rare-Earth Ores

Li,

Liu,

Liu

et al. 2023

Minerals

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Alkaline rock-type rare-earth (RE) ores have significant utilisation value. However, the exploitation of such resources faces great challenges owing to the complex mineral and element assemblages. Composite collectors exhibit excellent performances, which may provide solutions to the flotation problem of alkaline rock-type RE ores. Therefore, 16 collectors typically used in RE ores flotation were selected. Flotation tests were performed to identify collectors with high selectivity and collection ability for RE minerals, then nine composite collectors were prepared by combining the satisfactory collectors. The flotation performances of single and composite collectors for RE minerals were examined, and the composite collector FA301 with different carbon chain lengths was identified as the best one. When FA301 was applied in optimal conditions of slurry temperature, grinding size, collector and inhibitor dosage, RE concentrate yield of 6.29%, REO grade of 32.013%, and recovery of 59.02% were achieved. According to the results of the zeta potential, FTIR, and XPS test, the functional groups (dominated by carboxyl groups) in FA301 chemically adsorbed onto the main active sites (La, Ce, Y, etc.) on the surface of RE minerals. The findings can provide scientific basis for the development of efficient collectors to facilitate the exploitation of RE resources.

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Section: Introductionmentioning

confidence: 99%

Composite Collectors for the Flotation of Refractory Alkaline Rock-Type Rare-Earth Ores

Li,

Liu,

Liu

et al. 2023

Minerals

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“…For many reasons, investigation of the metal-binding properties of hydroxamic acidbased organic bioligands (containing at least one hydroxamic acid function, R C C(O)R N N(OH), where R C = alkyl or aryl; R N = H in primary derivatives, alkyl or aryl in secondary ones), whether naturally occurring or synthetic, has been a focus of interest for many decades. Most of the results are summarized in excellent reviews, some of which are referred here [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The previous results clearly demonstrate the significance of hydroxamatebased compounds in many fields, for example, they are known to play a crucial role in microbial iron uptake [3,5,6,11] and are capable of inhibiting a variety of enzymes, including ureases, peroxidases, and matrix metalloproteinases [8][9][10]14,16,[18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Diversity in the Interaction of Amino Acid- and Peptide-Based Hydroxamic Acids with Some Platinum Group Metals in Solution

2022

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Complexes that incorporate both ligand(s) and metal(s) exhibiting cytotoxic activity can especially be interesting to develop multifunctional drug molecules with desired activities. In this review, the limited number of solution results collected in our laboratory on the complexes of Pd(II) and two other platinum group metals—the half-sandwich type, [(η6-p-cym)Ru(H2O)3]2+, and [(η5-Cp*)Rh(H2O)3]2+—with hydroxamic acid derivatives of three amino acids, two imidazole analogues, and four small peptides are summarized and evaluated. Unlike the limited number of coordination sites of these metal ions (four and three for Pd(II) and the organometallic cations, respectively), the ligands discussed here offer a relatively high number of donor atoms as well as variation in their position within the ligands, resulting in a large versatility of the likely coordination modes. The review, besides presenting the solution equilibrium results, also discusses the main factors, such as (N,N) versus (O,O) chelate; size of chelate; amino-N versus imidazole-N; primary versus secondary hydroxamic function; differences between hydrolytic ability of the metal ions studied; and hydrolysis of the coordinated peptide hydroxamic acids in their Pd(II) complexes, which all determine the coordination modes present in the complexes formed in measurable concentrations in these systems. The options for the quantitative evaluation of metal binding effectivity and selectivity of the various ligands and the comparison with each other by using solution equilibrium data are also discussed.

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“…Recently, we reported [4] a practically simple approach to cyclic hydroxamic acids (N-hydroxy THIQ acids 1, R 1 = OH) via the CCR, which employed aldoximes as imine surrogates. Hydroxamic acids, in general, are known metal chelators successfully applied in analytical chemistry [5], nuclear fuel processing [6], mineral collection [7], corrosion inhibition [8], and drug design. Metal binding properties often determine the biological activity of hydroxamic acids, which can act as siderophores [9] (bacterial iron transporters) as well as inhibitors of metalloenzymes (such as matrix metalloproteases [10], hyston deacetylases [11], and HIV integrase [12]).…”

Section: Introductionmentioning

confidence: 99%

Two Annulated Azaheterocyclic Cores Readily Available from a Single Tetrahydroisoquinolonic Castagnoli–Cushman Precursor

et al. 2020

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A novel approach to indolo[3,2-c]isoquinoline and dibenzo[c,h][1,6]naphthyridine tetracyclic systems was discovered based on switchable reduction of 2-methoxy-3-(2-nitrophenyl)-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylic acid prepared via Castagnoli–Cushman reaction. Reduction with ammonium formate resulted in the expected selective transformation of the nitro group (thus providing access to substituted dibenzo[c,h][1,6]naphthyridine via cyclization and dehydrogenation). However, attempted reduction with sodium sulfide initiated a previously unknown reaction cascade including double reduction, cyclization, and decarboxylation, leading to formation of indolo[3,2-c]isoquinoline polyheterocycle in one synthetic step.

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Hydroxamic Acids as Chelating Mineral Collectors

Cited by 3 publications

References 69 publications

Composite Collectors for the Flotation of Refractory Alkaline Rock-Type Rare-Earth Ores

Composite Collectors for the Flotation of Refractory Alkaline Rock-Type Rare-Earth Ores

Diversity in the Interaction of Amino Acid- and Peptide-Based Hydroxamic Acids with Some Platinum Group Metals in Solution

Two Annulated Azaheterocyclic Cores Readily Available from a Single Tetrahydroisoquinolonic Castagnoli–Cushman Precursor

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