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acid leaching cationic

Creation of controllable cationic and anionic defects in

2019-10-1 · Acid leaching was carried out at room temperature in concentrated nitric acid. Cobalt doping was achieved by holding α-MnO 2 nanowires in Co(NO 3 ) 2 melt at 120 °C. Defect-rich α-MnO 2 nanowires, combining modifications in both anionic and cationic sublattices, were obtained by first reacting pristine nanowires with nitric acid and then with the cobalt nitrate melt.

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Effects of sulfuric and nitric acids on cation leaching

2020-3-12 · As will be presently shown, however, occurrence of anionic effects on cation leaching is strongly influenced by the pH of the input acid. Leaching Experiments Application of pH 3.0 Acids to Columns of Topsoil Breakthrough curves for Ca2+ in effluent from columns of Cecil topsoil that received 3.0 acid (Fig. 4-3) show a slight retardation for the H2SO4 treatment compared to the HNO3 treatment.

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Stabilization of cationic and anionic metal species in

contaminated in field with cationic Pb(II) and Cd(II)/Ni(II), and anionic Cr(VI) and As(III), respectively. The performance of metal stabilization under various operational and environmental conditions was evaluated with acid batch extraction and column leaching tests. Results indicated the

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Investigation of aggregation and acid dissociation of new

2021-5-2 · an efficient and economical way. Cationic exchangers are used in many applications such as the recovery of cobalt from acidic sulfate or chloride media [2-4], uranium from concentrated phosphoric acid [5, 6], etc. Although solvent extraction seems easy to implement, its physicochemistry is complex

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A study on selective leaching of heavy metals vs. iron

2019-4-1 · Cationic leaching pattern is proposed for most of metals species, such as Ca, Cu, Mn, Zn, Cd and Pb [ 15 ]. Furthermore, organic acids have been seen as potential lixiviants for fly ash leaching, for instance, citric acid [ 8, 16, 24, 25, 26 ], oxalic acid [ 20, 24, 27 ], and acetic acid [ 20, 28 ].

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UV-initiated polymerization of acid- and alkali

2017-10-31 · An acid and alkali resistant cationic flocculants (PAMA) was synthesized and characterized. • The synthesis conditions of PAMA was studied systematically. • PAMA was an efficient flocculants for sludge dewatering and showed strong acid and alkali resistance.

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Ion Exchange in Soil: Cation and Anion

2021-5-5 · Consequently, a nutrient cation such as K + is less tightly held by the colloids if the complementary ions are Al 3+ and H + (acid soils) than if they are Mg ++ +Na + (neutral to alkaline soils). The loosely held K + ions are more readily available for absorption by plants or for leaching in acid soils.

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Hydroxyapatite-Bound Cationic Ruthenium

2021-3-12 · These cationic RuHAPs exhibited Lewis acidity toward carbonyl and cyano groups, promoting Diels−Alder and Aldol reactions with high efficiencies. Moreover, no Ru leaching was detected in the above organic reactions, and then the catalysts were recyclable.

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Prevent Permeability Loss in Heap Leaching

2017-11-24 · Tests with sulfuric acid leach solutions were made after pretreatment with two types of solutions: (1) 2 pct cationic polymer and 4 pct potassium chloride in tapwater and (2) tapwater. In each instance the sample was allowed to retain the pore volume of preflush fluid for ½ h before leaching with sodium carbonate-bicarbonate or sulfuric acid

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Effects of sulfuric and nitric acids on cation leaching

2020-3-12 · Application of pH 3.7 Acids to Columns of Subsoil For pH 3.7 acids differences in cation leaching rates were observed between the acid treatments. Leaching rates of Ca2+ (Fig. 4-18) were initially greater for the HNO3 treatment but decreased to a rate only nominally greater than that for the H2SO4 treatment.

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Reinforcement of the two-stage leaching of laterite

2020-7-31 · A two-stage leaching process, namely, high-pressure acid leaching-atmospheric acid leaching, was used to treat laterite ores under mild conditions. The leaching ratio of Ni was low because of adsorption and incomplete leaching. In this work, surfactants were used as additives to boost the leaching ratio of Ni. The effect of surfactant type (cationic, anionic, and nonionic surfactants) on the

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Acid leaching of copper ore heap with fluoroaliphatic

Such aqueous acid leaching typically utilizes an aqueous solution of dilute sulfuric acid ("leachant"), which leaches, or dissolves, the copper from the ore. The aqueous acid leachant is typically sprayed on top of the heap or dump and allowed to percolate, or trickle, down by gravity between the ore pieces.

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Investigation of aggregation and acid dissociation of new

2021-5-2 · ACCEPTED MANUSCRIPT 1 Investigation of aggregation and acid dissociation of new cationic exchangers for liquid-liquid extraction Kateryna Omelchuka, Moncef Stamboulib, Alexandre Chagnes,c* a PSL Research University, Chimie ParisTech-CNRS, Institut de Recherche de Chimie Paris, 11 rue Pierre et Marie Curie, 75005 Paris, France

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US5207996A Acid leaching of copper ore heap with

Improved methods of heap leaching of copper ore with aqueous sulfuric acid solutions comprising a fluoroaliphatic surfactant are disclosed. The fluoroaliphatic surfactant increases the amount of copper values leached and recovered.

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Ion Exchange in Soil: Cation and Anion

2021-5-5 · Consequently, a nutrient cation such as K + is less tightly held by the colloids if the complementary ions are Al 3+ and H + (acid soils) than if they are Mg ++ +Na + (neutral to alkaline soils). The loosely held K + ions are more readily available for absorption by plants or for leaching in acid soils.

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Prevent Permeability Loss in Heap Leaching

2017-11-24 · It was assumed that if the test was continued, the permeability would be about 1 md it the end of 9 h. Subsequent large-scale column leaching tests on treated and untreated ore conducted by Noranda have confirmed these results, and show that cationic polymer pretreatment reduces the permeability loss in acid leaching of a clayey copper ore.

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Non-leaching, Highly Biocompatible Nanocellulose

2021-3-12 · Non-leaching antimicrobial surfaces offer great promise for the design of bioactive coatings to be used in medical devices. However, the vast majority are cationic, which brings about undesirable toxicity. To circumvent this issue, we have developed antimicrobial nanocellulose films by direct functionalization of the surface with

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Hydroxyapatite-Bound Cationic Ruthenium

2021-3-12 · Creation of a stable and well-defined active center on a solid surface is a promising protocol for designing more efficient hybrid-catalysts that bridge the gap between homogeneous and heterogeneous catalysis. Treatment of a hydroxyapatite-bound Ru complex (RuHAP) with an aqueous solution of AgX (X = SbF6-, TfO-) afforded a new type of cationic Ru phosphate complex, having

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钟宏(中南大学化学化工学院化工冶金研究所所长)_百度百科

钟宏,男,1961年3月出生,浙江龙泉人,畲族,博士,教授,博士生导师,享受国务院政府特殊津贴专家。现任矿冶工程化学国家级虚拟仿真实验教学中心主任,锰资源高效清洁利用湖南省重点实验室主任,中南大学化学化工学院化工冶金研究所所长,兼任中国化工学会理事、中国化学会理事、中国

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