Fig. 3 shows the recovery of kaolinite and hematite, using the collector DTAB, as a function of pH considering the three concentrations tested. The results showed that the separation between kaolinite and hematite is possible in the full range of pH, just for the concentration of collector equal to 1 × 10 −4 mol/L. Zhao et al. (2007), using an ammonium quaternary …
acids and their soaps are superior collectors for hematite flotation and among these, sodium oleate is the best collector. Rietz [2], Kihlstedt [3] and Kivalo et al. [4] have …
The hematite recovery was decreased to 1.05%, 0.50% and 19.90% at the dosage of 140 mg/L for NS, WS and G50, respectively. In addition, it was observed that the WS exhibited the most significant depressing impact on hematite recovery, followed by NS and then G50. The results indicate that starch type had a great effect on hematite flotation.
The IEP changes were dependent on the SO concentrations used; IEP of Indian hematite was displaced from 6.9 to 4.4 and 4.7 in the presence of 1 × 10 − 5 M and 1 × 10 − 6 M SO solution, respectively (Prakash et al., 1999). The interaction between hematite surface and SDS conflicts with that as presented by Han et al. (1973).
The use of small quantities of polyacrylic acid (PAA) was found to significantly improve the flotation of fine-sized hematite particles at pH 4.1 and 0.001 M NaCl with sodium dodecylsulfonate (SDS). Low polymer dosages before collector addition aid flotation by forming flocs of primary particles, but excess polymer results in low flotation yields due …
The hematite and quartz were taken from Huangshi minging Co., Hubei Province, China. The X-ray diffraction (XRD) patterns of these two samples (Fig. 1) indicate that these two minerals' purities were very high and satisfied to be used for the experiments.The X-ray fluorescence (XRF) further confirms that hematite and quartz have a high grade of …
For pure hematite, the atomic concentrations of C, Fe, and O were 19.97%, 18.73%, and 51.31%, respectively. The C atom comes from carbon pollution in the environment [37]. After hematite was treated by HPAM, the relative content of the main atoms (Fe and O) on the surface decreased by 5.70% and 4.52%, respectively.
The hematite samples of + 38 μm were reground and sieved using a ceramic ball mill and standard sieve respectively. Purified samples of the fine hematite were prepared by gravity separation (shaking table) and high intensity magnetic separation of the −38 μm fraction of the hematite as the feed. The minus 38 μm portions of the pure ...
In this study, citric acid was used as a dispersant to improve the flotation performance of hematite fines. The effect and mechanism of citric acid on the reverse flotation of hematite fines were investigated by flotation tests, sedimentation experiments, scanning electron microscopy (SEM), zeta-potential measurements, and X-ray photoelectron spectroscopy …
Hematite sample was obtained from an iron ore mine in eastern Canada. The coarse hematite particles were first ground in a ball mill and then wet sieved to collect the −20 μm fraction. The ground quartz sample of −15 μm was …
The examined mineral mixture tests were done in 3 different "hematite: quartz" weight ratios of 40:60, 60:40, and 80:20. Weight ratios are considered for simulating the low grade and high-grade iron ores containing silica, in which weight ratios of 40:60, 60:40, and 80:20 are indicating 27.6, 41.3, and 55.1% total Fe, respectively.
Reverse flotation desilication with anionic collector sodium oleate (OL) and activator Ca 2+ is a common beneficiation method to purify hematite. Herein, the separation mechanism of hematite and quartz were systematically investigated by experiments and DFT calculations with the effect of surface hydroxylation fully considered.
The effects of carbonate minerals (dolomite and siderite) on the flotation of hematite using sodium oleate as a collector were investigated through flotation tests, supplemented by dissolution measurements, solution chemistry calculations, zeta-potential measurements, Fourier transform infrared (FTIR) spectroscopic studies, and X-ray photoelectron …
(Mowla, Karimi, & Ostadnezhad, 2008) ont effectué des essais par flottation de l'hématite à partir du sable sur des fractions (150 -840 μm) dans une cellule de flottation Denver avec ...
The variation of the electrophoretic mobility of hematite as a function of pH in the presence of various concentrations of oleate is shown in Fig. 3.As can be seen in Fig. 3, the PZC …
Hematite has weak magnetic properties, and it is not good to use magnetic separation methods in the separation of hematite from silicate minerals such as quartz [7]. Froth flotation is the main method for sorting fine-grained refractory minerals [8], [9]. Reverse flotation is the most commonly used in the flotation separation of hematite and ...
The results of a number of comparative flotation characteristics of hematite flotation using the 18-carbon fatty acids are summarised in Table 2.The general trend was that the unsaturated fatty acids were stronger collectors for hematite compared with stearic acid, with an increased amount of double bonds/molecule often giving higher flotation recoveries.
The zeta potential data of hematite in Fig. 4 indicates that the IEP of hematite is 6.9, which is also within the range of values reported in the literature (Plaza et al., 2001;Yamada et al., 2001).
Hematite flocs exhibit a poor float rate in an alkaline environment. Thus, under strong acid conditions, the metal cations on the mineral surface dissolve in the solution, resulting in no active sites for oleate adsorption on the surface, which is not conducive to the flotation of flocs. Better flotation rates could be observed in the pH range ...
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Surface adsorption analysis depicted that in the presence of 100 mg/L TA, the adsorption amount of TA on the hematite surface was 0.99 mg/g, while this amount for quartz was …
Hematite recovery as a function of pH for an oleate addition of 10 −4 molar. 7. Conclusions and suggestions for future work. A detailed literature search and experimental program has been conducted to investigate the hematite-oleate system using techniques involved in the indirect and the direct measurement of oleate adsorption both at pH 4 ...
Surface adsorption analysis depicted that in the presence of 100 mg/L TA, the adsorption amount of TA on the hematite surface was 0.99 mg/g, while this amount for quartz was 0.17 mg/g (around 6 ...
The hematite flotation feed sample was characterized qualitatively for its mineralogical compositions using the coupling X ray diffraction (XRD) diffractometer (Bruker D8 XRD) operating at 40 kV, 44 mA and 2 o /min scan rate and the XRD pattern results are shown in Fig. 1, which shows that the major minerals in the flotation feed are hematite (Fe 2 O 3) …
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A sample of naturally occurring, relatively pure hematite (98.5% Fe 2 O 3) was used as a model for the study of the flotation of insoluble metal oxides. The isoelectric point of this sample was 2.7 and the point of zero charge was 6.7. A number of surfactants containing saturated 12-carbon chain groups were used as collectors over a wide range ...
The use of small quantities of polyacrylic acid (PAA) was found to significantly improve the flotation of fine-sized hematite particles at pH 4.1 and 0.001 M NaCl with sodium …
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 oleate to form a mineral cation-collector anion chemisorbed layer at the solid-liquid interface. The chemisorption reaction displaced surface hydroxyls and was …
hematite recovery because of fine particle entrainment. Keywords: particle size, hematite, entrainment, surface bonding site, reagent adsorption 1. Introduction Froth flotation technology is an important concentration process in the separation of quartz from hematite during iron ore beneficiation (Ma et al., 2011; Liu et al., 2018).
The hematite samples of + 38 μm were reground and sieved using a ceramic ball mill and standard sieve respectively. Purified samples of the fine hematite were prepared by gravity separation (shaking table) and high intensity magnetic separation of the −38 μm fraction …
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Reverse flotation technology is one of the most efficient ways to improve the quality and reduce impurity of iron concentrate. Mineral processors dealing with hematite face a …
The separation of fine mineral particles, especially using environmentally friendly approaches, is one of the main problems in the processing of low-grade ores and the re …
The effect of particle size on flotation performance of hematite and quartz was investigated. Microflotation, X-ray photoelectron spectroscopy analysis, reagent adsorption measurements, and ...
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