Excess Starch Flotation Hematite

Research describing the flotation of fine and ultrafine minerals has gained increasing attention [[10], [11], [12]].Flocculation flotation is a common method used for the separation of fine particles [[13], [14], [15]].Farrokhpay et al. studied the selective flocculation of nickel in a laterite ore and concluded that selective flocculation could reduce the adverse …

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 …

The flotation tests found that the flotation recovery of fine hematite increased observably to 94.51% from 68.69% by adding 4 mg/L PAAS before NaOL at pulp pH 7.3; in the separation of mixed hematite and quartz, the separation efficiencies of fine hematite with and without the addition of the PAAS are 85.71% and 68.84%, respectively.

Shrimali, Kaustubh, Atluri, Venkata, Wang, Yan, Bacchuwar, Sanket, Wang, Xuming, and Miller, Jan D. The nature of hematite depression with corn starch in the reverse …

Reverse cationic flotation, Hematite, Entrainment, Frother, Collector, ... the aim of this project was to assess the flotation performance when partially (beyond 10%) replacing excess amine collector with a commercial frother. ... higher starch dosages depress both hematite particles and locked particles. The same may be true for the collection ...

Hence, the depressing capability of the starches on hematite flotation by chemisorption falls in the order: WS > NS > G50. Note that weak hydrogen bonding still existed between starch and hematite surface under pH 10.0 although chemical interaction dominate the adsorption process to form five-member chelating species [15], [35].

Bench Flotation experiments in duplicate were performed in a 3 L Barker flotation machine. Agitation time with starch depressant was 5 min. Conditioning time with the collector was 2 min. Stirring with reagents was conducted directly in the flotation cell, with a pulp density of 33 wt% and the pH was maintained at a value varying between 9.5 ...

The excess modified starch enhanced the recovery of fine siderite and depressed the flotation of hematite. Thus, both the content and recovery of total iron decreased. ... a powerful collector for the flotation of agglomerates is necessary for reverse flotation of hematite. Modified starch is a promising green reagent that acts as a flocculant ...

It was found that the depressing ability of starch in hematite flotation had a positive correlation with the adsorption density of AP, and AP with longer branches would be more readily adsorbed onto hematite surface. In addition, adsorbed AP with more branches has stronger ability to depress hematite flotation.

Pavlovic and Brandão (2003) showed a decrease in the floatability of quartz in the presence of starch while the flotation of hematite flotation was depressed. Moreover, the adsorption studies ...

Gelatinization usually occurs by heating starch with excess water in the presence of NaOH. However, as this base is considered to be strong, it is practically all ionized, which can result in possible competition between ionic charges during the iron ore flotation process. ... This work aimed to develop cationic starch for hematite flotation in ...

DURING the course of an investigation of the effects of various starch products on hematite and quartz in regard to their separation by flotation, it was found that whereas most starches …

Reverse flotation of quartz from hematite is used extensively in the processing of iron ore containing quartz as the gangue mineral. It has been observed that depression of quartz takes place when excessive starch is used in the reverse flotation of iron ore, thus reducing the grade of the hematite concentrate. In the present work, the reason ...

Results of micro-flotation studies suggested that soluble starch was considered as a selective depressant for hematite. The maximum recovery difference between hematite and apatite of 77.5% was ...

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 to surface saturation by the …

Reverse flotation of silica from hematite is by far the most common strategy for the processing of iron ore containing silica gangue. In reverse flotation, quartz, the major impurity in the iron ore, …

Flocculation of fine-grained hematite could involve the grouping of fine hematite particles in a slurry using a flocculant; hence, the particle size could satisfy the standards conducive to efficient flotation [9].Zhang Xiaoliang et al. [10] have investigated the flocculation flotation of fine hematite with waxy corn starch as flocculant. The results revealed that the …

Reverse flotation of quartz from hematite is used extensively in the processing of iron ore containing quartz as the gangue mineral. It has been observed that depression of quartz takes place when excessive starch is used in the reverse flotation of iron ore, thus reducing the grade of the hematite concentrate. In the present work, the reason ...

In this study, an asynchronous flocculation method was explored in the flotation separation of mixtures of ultra-fine hematite (d 50 = 7.2 µm) and ultra-fine quartz (d 50 = 1.6 µm) using polyethylene oxide (PEO) and starch as the flocculant of quartz and hematite, respectively. Dodecylamine acetate was used as a collector for quartz in the ...

excess so that it begins to act as a frother, surface tension measurements were assessed. The other reagent conditions such as pH and depressant (soluble corn starch) were monitored and held constant. 2.4. Methods Bench Flotation experiments in duplicate were performed in a 3 L Barker flotation machine. Agitation time with starch depressant ...

the excessive alkalinity promoted a reduction in the hydrodynamic size of macromolecules. These findings ... Starch is an important flotation depressant that has been used in the ... approached by modeling the interaction of colloidal starch and hematite particles by DLVO theory [18,33]. This theory describes the magnitude

The aim of this paper is to provide a well-detailed, well-referenced source for the current status of iron ore flotation, and thus provide a useful guide to its future development and to further ...

Hematite is commonly upgraded in China using a reverse anionic flotation process with starch as depressant for hematite, Ca 2+ as activator and fatty acids as collector for quartz. The Anshan type of hematite is well known for its low grade, fine dissemination, difficulty in upgrading, and huge reserve in China.

In this study, three starches with different ratios of amylose/amylopectin on the molecule (Normal Starch, Waxy Starch and Gelose 50) were used to study their depressing …

The zeta potential of hematite after adding starch and DAMP was slightly higher than that of hematite with and without starch, but lower than that of hematite treated with only DAMP. This indicates that starch effectively inhibited the adsorption of DAMP on the hematite surface, which was in accord with the findings reported in the published ...

The current study found that the use of ultrasound-treated starch in the flotation separation of fine hematite and quartz better alleviated the loss of hematite to the froth products by, imparting …

Thus, starch is playing a dual role in the reverse flotation of iron ore, acting as a depressant by hindering amine adsorption at the hematite surface in order to maintain the hydrophilic surface ...

Micro-flotation tests for the hematite particles were carried out at different pHs with1.5 g/L starch and 4 × 10 −3 M DAC to evaluate the depressing ability of two starches, NS and G50. The degree of depression (D) was calculated using Eq.(11) (Yang et al., 2017): (11) D = (R i-R a) / R i where R i is the flotation recovery of hematite without starch, and R a is the …

Understanding hematite depression with starch and the corresponding hydrophilic state involves consideration of adsorption with amine as well as flocculation of fine hematite.

In this study, ultrasonic treatment was introduced to enhance the depressing performance of starch in the reverse flotation separation of fine hematite from quartz.