Using the technique of microelectrophoresis, Han et al. [7] demonstrated the chemisorption of oleic acid and lauric acid on hematite. Buckland et al. [8] also confirmed chemisorption of lauric acid on hematite surfaces.
For oleic acid, conditioning at acid pH values involves the interaction of water-insoluble droplets or colloids with the mineral surface, whereas at alkaline pH conditions, soluble oleate ions are the adsorbing species. Selectivity against gangue minerals relies on the correct choice of conditioning parameters.
The concentration of low grade iron ore resources was evaluated by washing and reduction. The advanced concentration methods for low grade limonite and hematite iron ores of South Eastern Anatolian resources required such specific methods. The followed column flotation and magnetic separation, microwave radiated reduction of …
Considering the great abundance of the mining tailings and the necessity of their use, in this work, acid heterogeneous catalysts based on sulfated iron oxides were synthesized using a mining waste as iron oxide source. These catalysts were tested in esterification reactions of oleic acid and methanol.
So, chemisorption was reported to be the dominant mechanism of oleate adsorption on the hematite surface, and physical adsorption and surface precipitation might be involved sometimes [15] [16] [17].
To separate siderite from carbonate-bearing iron ore efficiently, specific adsorption configurations and effective species were investigated to compare the adsorption differences of sodium oleate (NaOL) on siderite and hematite surfaces.
This work systematically studied the adsorption behavior of sodium oleate (NaOL) on hematite, limonite, and siderite and their corresponding flotation performance at alkaline pH.
Here, the authors study the adsorption of oleic acid on magnetite (001) and (111) surfaces experimentally by SXRD, LEED, FT-IRRAS and XRR, and employ a molecular dynamics force field specifically ...
The flotation of hematite with a mixture of tallow-type fatty acids (palmitic, stearic and oleic acids) is very sensitive to conditioning time, and suggests that, even though flotation is very ...
Hematite and quartz present in banded iron ore are intimately associated with one another and require fine grinding for the liberation of mineral particles. The influence of the thickness of bands on the liberation and flotation response of banded hematite quartzite (BHQ) ore is investigated.
Hematite flotation response and surface pressure for aqueous solutions of these fatty acids were measured as a function of pH. For the shorter chain fatty acids, the undissociated acid was shown to be the predominant surface active species with flotation, supplemented by the physical adsorption of acid anions as the chain length increased.
Detailed adsorption isotherms based on radiochemical analyses for adsorption of oleate aqueous species on α-FeOOH (goethite) are reported. The range of total oleate and pH conditions are shown, from detailed analysis of oleate solution chemistry, to be in a domain free of liquid oleic acid or metal oleate precipitation.
Calcite is a semi-soluble mineral that can be considered one of the main problematic gangue phases for several different types of valuable sulfides and oxides. Since froth flotation is the main beneficiation technique for upgrading these valuable minerals, calcite flotation separation has been widely investigated.
The adsorption mechanisms of 2-CLA on the quartz surface were investigated using Fourier transform-infrared spectra, zeta potential measurements, and X-ray photoelectron spectroscopy analysis, which demonstrated that 2-CLA was adsorbed onto the surface of activated quartz by strong chemisorption and hydrogen bonding.
Semantic Scholar extracted view of "Selective flotation of rare earth oxides from hematite and quartz mixtures using oleic acid as a collector" by G. Abaka-Wood et al.
e discussed discussed below). below). This This is is why why reverse reverse anionic anionic flotation flotation of of iron iron ore ore using using oleic oleic acid acid or or its its soaps soaps is usually is usually performed performed in a strongly in a strongly alkaline alkaline environment environment (i.e., above (
Flotation collector α-Bromolauric acid (α-BLA) was used to separate fluorapatite (FAp) from hematite. Flotation performance was presented by pure mineral and mixed binary minerals flotation experiments. The adsorption mechanism of α-BLA on FAp surface was investigated by zeta-potential, FT-IR spectra, and XPS measurements.
Humic acid (HA) was the predominant component of the MHA (modified humic acid) binder invented by the authors. This work aims to study the effect of the solution pH value on the HA adsorption onto natural magnetite/hematite/quartz particles and the strength of green pellets with the MHA binder.
A further study on adsorption interaction of humic acid on natural magnetite, hematite and quartz in iron ore pelletizing process: Effect of the solution pH value
So, chemisorption was reported to be the dominant mechanism of oleate adsorption on the hematite surface, and physical adsorption and surface precipitation might be involved sometimes [15] [16] [17].
Hematite flotation data, previously published by the author ( Quast, 1999a) using a sodium tallowate from BDH containing 22.3% palmitic acid, 16.8% stearic acid and 35% oleic acid and an I.V. of 49.4, showed similar flotation characteristics to a purer oleic acid sample for both single mineral and selective hematite flotation on a hematite ...
To investigate the effect of an amide group on the flotation performance of a fatty acid collector, a novel surfactant, 2- (carbamoylamino) lauric acid (2-CLA), was synthesized by introducing an amide group to the α-C position of lauric acid (LA). Flotation tests on pure quartz indicated that under suitable flotation conditions, pH of 11.5, 50 mg/L …
In a previous single minerals flotation investigation (Abaka-Wood et al., 2017b), it was identified that sodium oleate is capable of producing a comparatively selective monazite recovery from hematite and quartz, although the similarity in monazite–oleate and hematite–oleate adsorption warrants the use of depressants.
The depression mechanism proposed by these authors was the physical adsorption of negatively charged silicate to positively charged alkaline hydroxylated complexes, which led to hydrophilic film ...
The interaction of sodium oleate with hematite has been investigated through adsorption, electrophoretic mobility, and wettability studies. The pH and oleate concentration ranges were selected to preclude formation of bulk liquid oleic acid or acid- salt complexes. The effect of pH and temperature on adsorption and the electrophoretic mobility ...
Here, we provide mechanistic insight into the adsorption of one aromatic ligand, salicylhydroxamic acid (N,2-dihydroxybenzamide, SHA), through a series of investigations designed to relate ...
Under the condition of pH=11.5, the absorption of oleic iron is found on the infrared spectra of hematite after the effect of oleate, and the absorption of oleic calcium is found on the infrared ...
In the present work the utilization of humic acid as a depressant for hematite in the iron ore flotation process was studied taking into consideration its physicochemical properties.
Citric acid was reported Fig. 6 Contact angle (a) and adsorption density results (b) of collector (oleic-linoleic-linolenic acids), SDS, and collector-SDS mixture (at ratio 90: 10) on apatite ...
In this work, we mixed oleic acid (OA) with iron ore tailing (IOT) and heating it at different time and temperature, with the formation of gaseous, liquid and solid products, as showed in Fig. 1. The IOT was characterized by different techniques as showed in supplementary material.
