Investigation of Adsorption Mechanism of Reagents …
An understanding of the mineral surface-specific adsorption mechanism and proper selection of the reagents system is mandated for successful and effective flotation performance. ... to investigate the synergistic effect of dodecylamine kerosene as a collector in the reverse cationic flotation of iron ore slime. The hematite slime used in the ...
Direct measurement of oleate adsorption on hematite and its
Coadsorption of ionic and molecular oleate species has been proposed near the pKa of oleic acid. The direct measurement of adsorbed oleate onto hematite removes the …
Froth flotation of monazite from mixed minerals
flotation recovery of monazite from hematite and quartz minerals mixture using oleic acid as a collector and sodium silicate and starch as depressants. Specifically, the effect of oleic acid ...
Adsorption differences of sodium oleate on siderite and hematite
Unmodified NPs were synthesized by co-precipitation method and were altered to pH 12 using NH4OH to promote dispersity right before ex-situ modification with oleic acid (0.2–0.8 wt % oleic acid ...
Selective flotation of rare earth oxides from hematite and …
Zeta potential measurements were used to elucidate oleic acid adsorption mechanism onto the mineral particle surfaces. ... The main source of global metallic iron relies on high-grade magnetite, hematite and rhodonite iron ore, etc. With years of exploitation, high-grade iron ore resources are becoming increasingly depleted, and iron metal ...
Collecting Agent–Mineral Interactions in the Reverse …
The most popular anionic collectors used in iron ore flotation practice are oleic acid and its soaps [16,26]. The oleate in aqueous solution forms different species and which species dominate is dependent on pH. ... and an increase in the valence of anion leads to a drop in the adsorption of oleate on hematite [42,43]. 2.2. Cationic Collectors.
Flocculation and flotation characteristics of fine hematite …
The appearance of carboxylic group peak indicated that oleic acid interacted with hematite via physical and chemical adsorption (Shibata and Fuersrenau, 2003). For oleate-treated apatite (Fig. 12b ...
Facet-dependent adsorption of aromatic organoarsenicals on hematite …
Phenylarsonic feed additives such as p-arsanilic acid (p-ASA) and roxarsone (ROX) have been extensively used in concentrated animal feeding operations.p-ASA and ROX have attracted widespread attention from researchers because of their potential to release toxic and carcinogenic arsenite and arsenate when exposed to the environment [1].These aromatic …
The action of neutral oleic acid in the flotation of hematite
At low oleate concentrations there is a good correlation between oleate adsorption and hematite flotation. This does not hold for oleate concentrations > 5· 10 −5 M, where there is poor flotability in the acid region, although the adsorption of oleic acid is very high.This is attributed to the disordered character of the layer of cooperatively adsorbed oleic acid.
Use of conditioning time to investigate the mechanisms of …
It is the aim of this paper to examine the effects of conditioning time on the flotation of hematite using three technical grade fatty acid reagents as providing additional evidence on their ...
Minerals Beneficiation
Infrared spec troscopy was used to study the adsorption of oleate collector on three varieties of hematite. Each of the minerals was found to react with either oleic acid or a solution of sodium …
The Adsorption of Oleate from Aqueous Solution onto …
The interaction of sodium oleate with hematite has been investigated through adsorption, electrophoretic mobility, and wettability studies. The pH and oleate concentration ranges were …
ADSORPTION OF FATTY ACID SOAPS ON HEMATITE
established on hematite in an aqueous solution is discussed by Parks and de Bruyn (8) and occurs in two stages (Figure 1): 1 - a surface hydration stage 2 adsorption of potential …
The use of zeta potential to investigate the interaction of …
Bench-scale flotation tests were conducted on pure hematite and apatite minerals, their artificial mixture, and a high-phosphorus iron ore sample, using oleic acid as a collector.
A study of selective flotation recovery of rare earth oxides …
Selective flotation of rare earth oxides from hematite and quartz mixtures using oleic acid as a collector. Int. J. Miner. Process., 169 (2017) ... Flotation of rare earth minerals from silicate–hematite ore using tall oil fatty acid collector. Miner. Eng., 89 ... The mechanism of adsorption of fatty acids and other surfactants at the oxide ...
Effect of 25% Goethite on the Hydrophobicity and Oleate Flotation of
A review article on the use of oleic acid for the flotation of hematite has been published by the author[8]. This review examined the flotation characteristics of a high grade (>98 % Fe 2 O 3) specular hematite from a local source and a hematite ore containing 57 % Fe 2 O 3 using oleic acid. The maximum recovery of the specular hematite ...
The Effect of Oleic Acid Emulsification using SPE on Fluorite …
Besides, zeta potential measurements and IR analyses revealed that the addition of SPE led to strong chemical adsorption on the surface of fluorite, resulting in a significant difference in the flotation performances of the two minerals. ... oleic acid is currently the most widely used in the field of oxide ore. However, the dosage of oleic ...
Froth Flotation of Iron Ores
The adsorption of fatty acids on hematite plays a key role in the direct flotation route. In the literature, it is generally accepted that fatty acids adsorb on the surfaces of hematite through chemical bonding. Based on infrared studies, Peck et al.[6] established that oleic acid/sodium oleate chemisorb on hematite.
Adsorption of Hydrolyzable Surfactants: Effect of …
Under the N2 atmosphere, the oleic acid is transferred to a flask using clean, disposable glass pipettes by repeated rinsing with water at pH 11. The oleate stock solution is kept in the glove …
Adsorption differences of sodium oleate on siderite and hematite
The co-adsorption of oleic acid with oleate anions or acid soap dimers was demonstrated by adsorption isotherms (Jung et al., 1987). Morgan and Somasundaran further showed that NaOL might adsorb on hematite via two-point attachment or the adsorption of RCOOH RCOO − ( Morgan et al., 1987 ).
Effect and mechanism of siderite on reverse flotation of hematite
The effects of siderite on reverse flotation of hematite were investigated using micro flotation, adsorption tests, and Fourier transform infrared spectroscopy. The flotation results show that interactions between siderite and quartz are the main reasons that siderite significantly influences the floatability. The interactions are attributed to dissolved siderite species and fine …
Flotation of carbonates from dolomitic iron ore: synthesis
The collector molecule, derived from the oleic acid, was obtained via acylic substitution, as shown in Fig. 2, based on the work of (Muniandy et al., 2020). Briefly, (11,46 g; 40,60 mmol; 1,00 eq.) of oleic acid (A) was added to a round bottom flask in the presence of diethanolamine (B) (64,01 g; 608,80 mmol; 15,00 eq.). The reaction was ...
An investigation of the flotation minimum in the oleate …
This is in accord with the fact that the oleic acid is present as an insoluble oil, and the hematite surface is positively charged. The oleic acid-aqueous system has been described in recent publications by the author (e.g. Quast, 2016a, Quast, 2016b, Quast, 2016c) which can be consulted for information. In summary, insoluble oleic acid would ...
The use of zeta potential to investigate the interaction of …
As a result of a literature survey concerning the use of primarily zeta potential measurements in investigating the solution species associated with the use of oleic acid as a flotation agent for hematite, it has been concluded that adsorption of this reagent can occur by either or both physical and chemical mechanisms depending on the solution ...
R. D. Kulkarni and P. Somasundaran
In this study we have examined the role of this adsorption and the kinetics involved by determining the dy-namic surface tension of oleate solutions and flotation ob-tained using …
Investigation of Adsorption Mechanism of Reagents …
Sodium oleate and oleic acid are used as collectors for hematite [10]. It is established that oleic acid, sodium oleate and lauric acid chemisorbs on hematite surface [11–13]. Protons of oleic acid easily neutralize with the hydroxyl groups present on the mineral surface by forming water molecules, thus facilitating its adsorption.
Flotation performance and mechanism of α-Bromolauric acid …
In the northern regions of China such as Hebei Province, Liaoning Province, Inner Mongolia Autonomous Region and Jilin Province, there are about 2.7 billion tons of phosphorus-bearing iron ore deposits (Liu et al., 2017).The ore deposits in these regions usually contain elements such as iron, titanium, and phosphorus (Wu et al., 2015).The mainly useful minerals …
Direct measurement of oleate adsorption on hematite …
Direct measurement of oleate adsorption on hematite and its consequences for flotation. Author links open ... 2010) and this study was a high grade (98.5% Fe 2 O 3) hematite ore from the Iron Prince deposit in the Middleback Ranges of South Australia. Mineralogical and surface chemical data on this sample have been published previously by the ...
The action of neutral oleic acid in the flotation of hematite
Using flotation-size hematite, the amount of (labelled) oleic acid adsorbed, both in Hallimond-cell tests and in adsorption experiments, was determined. On finely ground …
Flotation of rare earth minerals from silicate–hematite ore using …
The pracaxi collector was found to be mainly composed of oleic acid (56.2%), linoleic acid (14.1%) and behenic acid (10.6%), in addition to exhibiting a critical micelle concentration (CMC) of ...