The feasibility of dephosphorization using the flotation process and its mechanism of high-phosphorus oolitic hematite were discussed in this paper. The results showed that phosphorus minerals mainly exist in the form of collophane, which can be divided into three types. Block collophane and band collophane could be effectively removed through flotation, while the …
Based on the surface difference of hematite and quartz in solution, a hydroxyl-containing polyamine cationic surfactant was designed and screened with the assistant of computer simulation (molecular dynamics (MD) simulation and density functional theory (DFT) calculation) to enhance the separation efficiency in the reverse flotation system of hematite ore.
To understand why hematite of different genesis behave diversely in flotation systems, this study assesses the flotation response at pH 5 of bulk (morphology, texture, Crystal Preferential Orientation (CPO)) plus interfacial (surface area, zeta potential, immersion enthalpy, contact angle, induction time) characteristics of species formed under distinct metamorphic …
The flotation of hematite and apatite using sodium oleate as collector and the collection mechanism were studied through flotation tests,solution chemistry calculations and infrared spectroscopic analysis.The results show that hematite possesses good floatability in the pH range of 7 10 and apatite displays good floatability in the pH range of 3 12.Under the alkali …
Hematite and quartz were selected as the model gangue minerals, as they have been reported to occupy the bulk of typical REE-bearing tailings generated in South Australia. Froth flotation, which is one of the most important beneficiation processes, has been the most effective and efficient method for recovering and upgrading REE minerals. ...
The hematite flotation results as a function of pH using Kitacid 261 (Fig. 6) show similar characteristics to those reported for comparable additions of Kitolene 011 shown in Fig. 4. The lower flotation recoveries across the pH range corresponding to the lowest addition rate would be due to the lower amount of available surfactant and the ...
1. Introduction. Iron ores are important feedstock materials for ironmaking and steelmaking [1].Most iron ores in the earth crust are in the form of hematite (Fe 2 O 3) or magnetite (Fe 3 O 4).These valuable minerals are often associated with gangue minerals such as quartz and silicate minerals [2].Low grade iron ores cannot be used directly in the blast …
Despite the importance of solid concentration in froth flotation, its effect on flotation kinetics and entrainment has rarely been studied. In this study, the flotation kinetics and entrainment in quartz and hematite single-mineral …
We have developed a new green chemical approach for the shape-controlled synthesis of single-crystalline hematite nanocrystals in aqueous medium. FESEM, HRTEM and SAED techniques were used to determine the morphology and crystallographic orientations of each nanocrystal and its exposed facets. PXRD and HRTEM
For example, at Republic Mine, Michigan, U.S.A., a hematite ore is upgraded from 36.5% Fe to 65.4% Fe with a Fe recovery of 82.5% using the direct flotation route. Fatty acids (a distilled tall oil containing approximately 91% oleic and linoleic acids, 6% rosin acid and 3% unsaponifiables) are used as the collector of iron oxides, the dosage of ...
Hematite and quartz have excellent floatability and were difficult to be separated by flotation using collector DDA. Microflotation experiments proved that PASP was an efficient and highly selective hematite depressant. The artificial mixed mineral experiment proved that the depressant PASP can achieve efficient flotation separation of the two ...
Hematite recovery was feasible at a pH of around 3. In microflotation tests, the iron grade and recovery reached approximately 37% and 30%, respectively. These values increased in batch flotation circuits, specifically in the cleaner stage, the iron grade reached approximately 44% and the recovery was approximately 65%.
Oleate flotation characteristics of hematite have been investigated in this study under a wide range of experimental conditions of pH, temperature, ionic strength and collector concentration. The study revealed the following major features of this system which include: (a) a maximum in floatability in the neutral pH range; (b) an increase in ...
Researchers have tried to improve flotation of fine hematite particles by enlarging their apparent sizes through aggregation, carrier flotation, selective flocculation, and hydrophobic (shear) flocculation (Qiu et al., 1993, Shibata and Fuerstenau, 2003, Forbes, 2011).For example, Guo (2003) demonstrated that fine hematite can be recovered from fine-grained hematite ore …
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). Three main routes for iron ore beneficiation through flotation, namely reverse …
This study evaluated the effects of collector type amide-amine compared with those of conventional etheramine acetate (both cationic collectors) on the surface properties of quartz and hematite. An examination of certain properties of the reagents indicated that the new collector amide-amine has CMC (critical micelle concentration) and pKa values (100 mg/L and 8.2, …
The hematite anti-floatation depressor is easy to prepare, good in floatation effect and low in usage, the defects of maize starch as the depressor are overcome, selectivity of the depressor is improved, iron recovery rate is increased, usage of the depressor is reduced, the requirements of the dressing process are met, sufficiency of iron ore ...
Oleate enabled greater mass recovery in the floated product for the same specific dosage at 300 g/t. The pure hematite flotation tests performed with amidoamine as the collector showed that no hematite was floated. This absence of hematite flotation is in accordance with the contact angle measurements for hematite with amidoamine.
While hematite and quartz ores were hand-sorted and ground to −0.150 +0.045 mm. Chemical component of samples are listed in Table 1 and X-ray diffraction patterns which were carried out by an X'Pert Pro diffractometer (X'Pert Pro MPDDY2094,PANalytical B.V.,Holland) at 40 kV, 30 mA, diffraction angle range 2θ from 5° to 90° by Cu ...
Low grade deposits containing specular hematite (Fe2 O3) as the major iron mineral as low as 25% Fe can be treated with "Sub-A" Flotation to …
The present investigation was initiated to examine the significance and role of polysaccharides in the reverse flotation of iron ore. Since hematite is already hydrophilic at alkaline pH, where reverse flotation is taking place, the role of polysaccharides should be considered with respect to amine adsorption and maintaining hematite in a hydrophilic surface …
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.
In this study, 4-tert-butyl-catechol (TBC) was designed as a collector to directly float out hematite from quartz. The micro-flotation tests demonstrated that under pH ~9.0, 1 × 10 −5 mol·L −1 TBC recovered 98% hematite from its mixture with quartz, while the recovery of quartz was only about 17%.
The early hematite beneficiation is mainly gravity separation with machines of jigger, centrifugal separator, spiral chute, spiral washer, shaking table can be involved and later floatation separation and floatation separation has been used in the hematite iron ore upgrading with floatation separator and magnetic separator involved. Get Price
The hematite surface was not affected by any of the three tested collectors below a concentration of 0.01 mg/L, and exhibited its natural hydrophilic characteristics with a contact angle at about 20°. When the collector concentration was above 0.2 mg/L, there was a sharp increase in the measured contact angle. ...
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-processing of mining tailings. This work assesses the potential of biosurfactants as collectors in the flotation of ultrafine (smaller than 20 μm) particles of hematite and malachite. As …
For hematite, the highest recovery of 48.14 % was observed near pH 7.42, following a trend of increasing and then decreasing recovery with increasing pH value. Additionally, within the pH value range of 4.0–10.0, the recovery of hematite was significantly lower than that of quartz, indicating that DAMP exhibits a stronger collecting ability ...
The invention relates to a preparation method of a floatation depressing agent, in particular to a preparation method of a micro-fine particle hematite reverse flotation depressing agent. The micro-fine particle hematite reverse flotation depressing agent is prepared from cornstarch, ammonium ceric nitrate, acrylamide, sodium bisulfite, formaldehyde, carboxymethyl starch, …
Extreme poverty bloodstone stone is the important iron ore type of China, and its production-grade is generally at 16-23%.The ore-dressing technique of handling at present lean hematite adopts stage grinding, coarse and fine separation, gravity treatment-strong magnetic-floatation process and ore grinding, strong magnetic---floatation process continuously more, but handles …
For hematite and quartz, − 0.010 mm of fine particles were removed from − 0.045 mm samples by the elutriation method [40], thus − 0.045 + 0.010 mm fractions of hematite and quartz were prepared. Then, − 0.010 mm of siderite sample was also collected by the elutriation technology after the − 0.045 mm fraction of siderite was further ...
Currently beneficiation of hematite ores is conducted using either direct flotation (hematite flotation) or indirect flotation (quartz flotation) tech-niques depending upon the nature of the available ore bodies.
The traditional hematite depressant starch has the disadvantages of poor solubility and high viscosity. In this study, a novel hematite depressant, pullulan, with better performance and flotation effect than starch was found. …
Chlorite is often associated with hematite and tends to form microfine particles during grinding, making it challenging to recover and separate from hematite through flotation. This study innovatively applies an ester-based cationic polyacrylamide (CPAM) as a flocculant in a reverse flotation system using dodecylamine (DDA) as a collector, to ...
This study introduces asynchronous flocculation into the flotation separation of ultrafine hematite, kaolinite, and chlorite, whereby asynchronous flocculation flotation, utilizing multiple flocculants, selectively flocculates both target and clay minerals.
It is generally recognized that flotation is a surface-chemistry–based process that based on the differences in wettability between materials [9, 10].Regarding the depression of hematite by starch in reverse flotation, interface chemistry plays an important role in preventing hematite surface from being substantially functionalized by the collector or adhered by air …
Recent literature has showed the potentiality of microorganisms as a flotation reagent. In the present study, a non-pathogenic hydrophobic bacterium (Rhodococcus opacus) has been investigated as a flotation reagent for the hematite–quartz system.The studies were based on electrophoretic mobility and contact angle measurements, scanning electron …