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Etheramines are quartz collectors and also play a role as frothers in cationic reverse flotation of iron ores. While the adsorption of this surfactant on quartz surface has been widely investigated...

White silica sand samples were collected from Steuong Hav district area. The samples were mixed and quartered to obtain a representative sample for physical and chemical characterization. Silica (SiO2) and iron oxide (Fe2O3) content were measured by X-ray fluorescence (XRF) analysis. The results showed silica and iron oxide content at 94.83 wt.% and 0.189 wt.% representatively. In this study, a shaking table, Wet High-Intensity Magnetic Separators (WHIMS), and reverse flotation technique was undertaken to remove mainly iron oxide. The collectors amine (named AOA) and petroleum supinate (named NANZA), pine oil as frother, and H2SO4 as depressant were used to optimize the froth performance. The iron oxide content was removed from 0.189wt.% to 0.062 wt.% and the silica content was upgraded from 94.83 wt.% to 98.6 wt.% after the process.

The depletion of high-grade iron ores has necessitated the beneficiation of low-grade iron ores. Flotation is considered the most efficient operation to upgrade the iron content of fine-grained ore...

This work aimed to upgrade a low-grade sedimentary phosphate ore through attrition scrubbing/desliming and an anionic/cationic reverse flotation technique. The mineralogical and chemical examinatio...

This paper investigates the reverse flotation of iron ore in a laboratory mechanical, oscillating grid (OGC) and pneumatic flotation cell. The main objectives are to investigate the recovery of coarse quartz (+150 µm) by flotation and fine hematite (−25 µm) by entrainment. Agitation/energy input results show that coarse quartz recovery increases with increasing impeller speed to a maximum of ±70%. The recovery of coarse quartz in the OGC is ±10% higher than in the mechanical cell with an optimum at a low energy input of 0.1 W/kg. Froth height results show that coarse quartz recovery and fine hematite loss decrease by over 50% with increasing froth height. Solids concentration results show that coarse quartz recovery remains relatively constant with decreasing solids concentration, but fine hematite loss decreases from 15 to 5% at the maximum froth height due to lower water recoveries. The OGC generally results in the best overall flotation performance at lower energy input. The pneumatic flotation cell achieves better flotation performance than the mechanical flotation cell for most operating conditions.

In the present investigation, beneficiation of a low-grade dolomite fines was carried out with the aim to remove the siliceous gangue content. Extensive experimental studies on direct and reverse f...

The Bayer process is a conventional method for refining bauxite in the production of alumina. The Al/Si ratio in bauxite before feeding to the process must be enriched to more than eight by reducing impurities (mainly aluminosilicates). Therefore, diasporic bauxite ores (Al/Si

An iron ore mineral processing plant in Brazil treating Itabirite ore was assessed by sampling a circuit consisting of Wemco 144 mechanical cells, as part of the AMIRA P9P collaborative research project. This paper presents and discusses the results of entrainability, water recovery and quartz and hematite grades associated to hydrodynamic parameters. The results indicated strong correlation between water recovery and hematite losses which was intensified by the operating conditions of the circuit. A potential alternative to reduce the hematite losses through entrainment and to increase quartz removal was to modify the traditional circuit design to treat rougher and cleaner/recleaner tails in different stages. In addition, the scavenger residence time must be matched to the quartz floatability. Changes to design and operation of these circuits are needed to sustain concentrate recovery and grade as iron ores become finer.

Based on the analysis of occurrence states and properties of a calcareous–siliceous phosphorite, the effects of GZ 1 collector dosage, regulator dosage, pulp density and particles size distribution of sample on concentrate indexes were investigated by reverse flotation technology. The rare earth oxidize (REO) grade and recovery of concentrate were also analyzed in the work. Two-stage reverse flotation technology was applied for the beneficiation of a calcareous–siliceous phosphorite. Under the integrated optimal single factor conditions of GZ 1 collector 0.9 kg/t, phosphate regulator 14 kg/t and pulp density 35 wt.%, mass fraction of particles size of − 74 μm of 85 wt.%, flotation time of 11 min and flotation pH of 5.5, the P 2 O 5 grade increases from 14.64 wt.% in raw ore to 26.82 wt.% in the concentrate, and the recovery is 72.09 wt.%, while REO grade increases from 0.08 wt.% in the raw ore to 0.175 wt.% in the concentrate, and the recovery is 86.08 wt.%.

Barite deposit at Mangampet is one of the world’s largest deposits containing around 61 million tonnes of recoverable barite. Beneficiation of low grade barite dumps interlocked with schist and slate gangue was studied using amine as collector (reverse flotation) to avoid the collector coating on barite. Instead of conventional flotation cells, flotation column was opted due to inherent advantages. The liberation of barite from gangue minerals and the interaction of amine at mineral–water interface were discussed. Laboratory tests indicated that the barite concentrate assaying 95 % BaSO4 could be obtained with a recovery of around 70 % in a single stage column flotation. The recovery was improved to 85 % by incorporating scavenging flotation by conventional cells. Based on the laboratory results, commercial flotation column to treat 700 tpd was designed and commissioned. The quartz removal in commercial column was estimated using Dobby and Finch model. Good agreement was observed between predicted and experimental results of quartz elimination.

In general, the industrial flowsheets for the beneficiation of itabirite iron ores from the Quadrilatero Ferrifero (Minas Gerais state) in Brazil involves grinding, desliming, magnetic separation and cationic reverse flotation using both mechanical and columns flotation cells. At Brazilian plants, it is estimated that Fe losses generated at the slimes stage range between 8% reaching values higher than 20%. Slimes generated at hydrocyclone containing particle sizes of approximately 99% 10 μm, 45%

Froth flotation has been widely used in upgrading iron ores. Iron ore flotation can be performed in two technical routes: direct flotation of iron oxides and reverse flotation of gangue minerals with depression of iron oxides. Nowadays, reverse flotation is the most commonly used route in iron ore flotation. This review is focused on the reverse flotation of iron ores, consisting of reverse cationic flotation and reverse anionic flotation. It covers different types of collecting agents used in reverse iron ore flotation, the surface characteristics of minerals commonly present in iron ores (e.g., iron oxides, quartz, alumina-bearing minerals, phosphorus-bearing minerals, iron-bearing carbonates, and iron-bearing silicates), and the adsorption mechanisms of the collecting agents at the mineral surface. The implications of collecting agent–mineral interactions for improving iron ore flotation are discussed.

This paper has adopted the weak magnet concentrate single reverse flotation and strong magnet concentrate reverse-direct flotation technology to conduct the industrial test on oxide ores of Bayan Obo. After the stability test, able to obtain oxide ore iron concentrate, TFe grade 65.92%, iron recovery rate 73.99%, K 2 O+Na 2 O, SiO 2 and F reaching 0.39%, 3.2% and 0.48% respectively, indicators great; the new process can reach the purpose of increasing iron and decreasing silicon, sodium and potassium.

According to the properties of a medium-and-low grade collophanite, a contrast testing study was conducted on the basis of three kinds of flotation process. The result suggests that it is difficult to obtain high-quality phosphate concentrate from removing carbonate minerals only by the use of reverse flotation process. In contrast, with the use of direct-reverse flotation process and double reverse flotation process, the separation of phosphorus minerals and gangue minerals in the ore can be realized effectively, as the result, the P2O5 grades of phosphorus concentrate are 32.29% and 31.26%, respectively. Considering the above factors, we recommend direct-reverse flotation process as the method to deal with the medium-and-low grade refractory collophanite.

Getting magnetite concentrate with extremely high Fe grade using reverse flotation method has become increasingly important due to the enhanced requirement of iron making industry. The coagulation in magnetite-concentrate flotation system may impose negative effect on flotation performance. This paper combined the DLVO calculation and microscope observation to study the coagulation behavior in the system. The result shows that the coagulation between fine magnetite and coarse silica particle is very likely to occur with energy barrier 1.5 × 10 −18 J at pH 10.0, which is much smaller than 1.6 × 10 −17 J and 3.3 × 10 −17 J for fine magnetite and fine magnetite-coarse magnetite particles. The coating of fine magnetite particle on silica surface was observed under microscope. Mechanical scrubbing increases the concentrate Fe grade and recovery by 1.5% and 8.5% respectively. Magnetite concentrate of 67.9% Fe grade and 71.5% Fe recovery was finally obtained.

：The phosphate is low silicon carbonate collophane, gangue mainly dolomite. Apply to the reverse flotation technology, determine one-stage roughing and one-stage scavenging reverse flotation test process,Collector with paraffin soap oxidated,Inhibitor use sulfuric acid. By the reverse flotation process contain. When the ore grade is 20.11%,under the flow sheet can research qualified phosphate product with content of 33.95% in concentration and recovery of 62.06%.

This paper reports a study that implements reverse flotation method to separate silica from West Kalimantan bauxite ores. The study is aimed to find the good process condition to obtain low-silica bauxite as the feed for the Bayer process. The experiments were carried out in a 1 L of flotation cell tank. Dodecylamine was used as the collector, starch as the depressant, and MIBC as the frother. The varied parameters were solid content to solution (15–30% w/w), and pH (6 – 10). The results of XRF of products show that in all reverse flotation experiments, the ratio of alumina to silica (Al/Si) are increased from 7 up to 14. The increase of solid percentage in the flotation gives a good result for Al/Si ratio as well as alumina and silica recovery in concentrate, with 30% w/w solid percentage to solution increases Al/Si ratio to 14.38, with silica recovery of 20%. The good separation with variation of depressants is obtained with depressant concentration of 400 g/ton bauxite, with Al/Si ratio in concentrate ...

The use of natural products is essential in the processing of iron oxide ores by flotation. It is the purpose of this review to trace the historic development of the use of some natural products in the processing of iron oxide ores. The reagents used for floating either iron oxides or activated silica are usually derived from vegetable origin, frequently from wood products containing primarily unsaturated carboxylic acids. In the reverse flotation of iron ores, the iron oxides are often depressed using polysaccharides, with various starches being extensively used. Hematite depression is usually conducted at high values of pH, and cationic surfactants are generally used to float off the silica. It is through the previous research and development of natural products that global commercial processing of iron oxide ores by flotation is economically viable, and the only method for treating fine grained iron ores. There are also some reports of the use of bacteria to modify the surfaces of the hematite leading either to its flotation or depression, but this has not been adopted at industrial scale as yet. Refereed/Peer-reviewed

It is a developing trend for the refractory materials industry that producing refractories using the kyanite ore with minute amounts of titanium. The tests were conducted with an ore sample by a mechanical flotation cell. The isoelectric point of the kyanite ore was found to be pH 6.6. Petroleum sulfonate was found to be an effective collector for kyanite flotation. 55.85% Al2O3is produced with 84.41% kyanite recovery by grinding, desliming, reverse flotation and kyanite flotation.

The main gangue minerals in bauxite ore are kaolinite, illite and pyrophyllite. The bauxite reverse flotation aims to float them out. In this essay, a certain type of bauxite is taken into account to design and synthesize the N-Alkyl-1,3-diaminopropane from the perspectives of solid-philic group and nonpolar group by applying the kaolinite crystal model in Curis2 software. It also studies the function mechanism of this newly developed reagent in flotation by applying flotation solution chemical calculation, ζ-potential test and infrared spectrometry test.

Relative contact angle and heat of wetting can be used to provide a measurement of surface wettability of synthetic magnetite. The comparison between synthetic and natural magnetite in terms of surface wettability showed that, using the same kind of wetting liquid, the difference in the relative contact angle was 10° between the concentrate and tailings obtained from reverse flotation of synthetic magnetite, while the difference was more than 20° between the concentrate and tailings obtained from reverse flotation of natural magnetite. As for the concentrate and tailings from reverse flotation of synthetic magnetite with water as wetting liquid, the relative ratio of their wetting heat was 106.21%. In comparison, the relative ratio of wetting heat was 176.59% for concentrate and tailings from reverse flotation of natural magnetite, showing a 70.38% difference.

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. A computer program is developed to predict the liberation of banded iron ores based on different patterns of banding. It is found that the phase which is distributed in thick bands is better liberated compared to thin bands. QEMSCAN studies on BHQ samples have shown similar trends. The direct and reverse flotation behavior of the BHQ ore using oleic acid and dodecylamine respectively was determined. In reverse flotation, 64.4% Fe at 59% recovery could be obtained from an ore having thick quartz bands, whereas under identical conditions, only 60.6% Fe at 64.8% recovery could be obtained with thin bands. In the case of direct flotation, it is possible to achieve 63.8% Fe at 50.7% recovery for the ores with a thick quartz band and 62.7% Fe at 58.1% recovery for the thin band.

Weathered phosphate ore is an important part of phosphate ore resources, it contains a huge reserves of weathered phosphate ore resources in Yunnan regions. With the gradual consumption of the rich phosphate ore resources, recycling for weathering phosphate ore is receiving more and more people's attention. In this study, using a low magnesium semi-weathered phosphate ore which from Yunnan Dianchi Lake area as the research object, and based on its ore properties established a experimental program of pre- desliming with cyclone and then flotation. The loss rate of P2O5 under 20% on the desliming operation, then under the condition of ore grade of P2O5 is 21.23% using a positive-reverse flotation process, ultimately obtained a test indicators of phosphate concentrate of P2O5 grade of 28.41% and P2O5 recovery of 87.25%, which is a foundation of development and application of phosphate ore from Tian Ning semi-weathering ore.

A phosphate rock containing MgO 7.95% and SiO29.64% has fine dissemination size, which is from Yichang city in Hubei province, China. Technical conditions of the ore were investigated by performing the desilication process of double reverse flotation, which adopted GE-609 to flotate silicon. The results showed that under defoamer DE-1 36g/t, phosphate concentrate with P2O531.91%, MgO 0.97%, SiO29.46% and recovery of 88.71% were obtained by employing the process of close-circuit reverse flotation.

Recovery of iron values from banded magnetite quartzite (BMQ) ore by direct and reverse flotation technique is presented. In direct flotation, with oleic acid as the collector, the iron grade in the concentrate that could be achieved is limited to 57% Fe from a feed containing ~ 47% Fe. The difficulty of concentrating iron values by direct flotation technique is due to the fine coating of iron hydroxide over the particles at alkaline pH. In reverse flotation, better selectivity and collectability could be achieved using dodecylamine chloride as the collector. A statistical modeling approach called response surface methodology has been undertaken to optimize the reverse flotation process to maximize the iron grade and recovery. All the experiments have been conducted as per the central composite rotatable design (CCRD) taking collector, frother, depressant and pH as the factors. The program predicted 64.68% Fe with 66.38% recovery at a dodecylamine concentration of 271.88 g/T, MIBC: 40 g/t, starch: 400 g/T and at pH 9.5, which is also validated by the experimental results.

The collophane is in oolitic structure, and associates with the gangue intricately; and hence a good concentrate in performance is hardly produced only by rinsing, in order to achieve a full liberation, fine-grinding is needed for the cellophane. Based on the results of both direct and reverse flotation tests, it shows that reverse flotation is effective in the benefication of the apatite to a certain extent. When reverse flotation is used to dress the run-of-mine which contains 26.95%P2O5, a concentrate containing 32.69% P2O5 can be obtained at a recovery of 84.99%.

Based on the analysis of the properties of a high carbon pyrite from Yunnan, a series tests on gravity concentration and flotation were carried out. According to this basis, a closed-circuit flotation test scheme was worked out, which obtained a fine quality pyrite concentrate with a sulfur grade of 38.24%, comprehensive sulfur recovery of 70.87% and carbon content of only 0.87%.

Apatite is a valuable component of the collophane taken from Yunnan, as it is in the shape of oolith and contains a lot of carbon, and hence an effective benefication of the apatite is difficult to be occurred by means of concentration. Based on the results of both direct and reverse flotation tests, it shows that reverse flotation is effective in the benefication of the apatite to a certain extent. When reverse flotation is employed to treat the run-of-mine at a grade of 18.77%, the concentrate containing P2O5 24.04% at a recovery of 62.58% can be produced.

At present, the good classification index has been achieved by anionic reverse flotation technology for the Anshan hematite, but the grade of the tailing is still high. The main reason is that the fine useful minerals can not be recovered effectively .According to the advantages of the packed flotation column, the reverse flotation tests of a hematite were conducted using the packed micro-bubble contacting flotation column. Based on the conditional tests of flotation column operating parameters and the pharmaceutical system, an iron concentrate with TFe grade of 67.05% was obtained and the grade of tailings was 11.25%.

In order to develop and utilise cheap iron ores with low quality for cost reduction, a hematite ore from Xinjiang province was investigated to determine the iron increase and silicon reduction using ore dressing process experiments. Results showed that iron concentrate with 61%Fe and iron recovery of 66% were achieved through the process flowsheet of grinding, high intensity magnetic separation, regrinding of coarse concentrate, clean concentration by high intensity magnetic separation, roughing reverse floatation and cleaning reverse floatation of the high intensity concentrate, with the tailings from this latter stage fed back into the roughing reverse floatation stage.

In the process of recycling phosphate ore processing wastewater, the accumulation of inorganic ions and the flotation reagents have a great influence on the flotation performance when they reach to a certain concentration. This paper studied the effect of Ca2+, Mg2+, SO42- and PO43- on the reverse flotation of phosphate ore through the single factor experiment. The experimental results show that Ca2+, Mg2+ and PO43- have less effect on the flotation performance, and that a certain amount of PO43- in the ore pulp can reduce the dosage of acid and improve the flotation result. SO42- has a significant effect on the reverse flotation of phosphate ore and the concentration of SO42- should be controlled under 1 g/L in the backwater utilization.

This test used countercurrent bubble contact flotation column in reverse flotation to improve the grade of magnetic concentrate. By the tests of operating conditions and reagent system experiment, when the ore grade of concentrate after magnetic separation is 42.15%, after one roughing ,we can obtain the grade is 65.82% and recovery rate is 62.79% of the concentrate.

The recovery of iron bearing minerals from the reject products of the beneficiation of iron ores is a challenge concerning the sustainability of the preliminary stage of iron and steel making. This investigation addressed the production of iron ore concentrate within the specifications of Samarco's pellet feed from a representative sample of the concentrator I desliming cyclone's (101.6 mm, 4") overflow. The experiments included stages of microdesliming and flotation. The developed microdesliming method was efficient and the concentrate produced via cationic reverse flotation presented silica content compatible with pellet feed requirements. A recuperação de minerais portadores de ferro, a partir de rejeitos de beneficiamento de minérios de ferro, representa um desafio quanto à sustentabilidade do estágio preliminar da siderurgia. Essa investigação abordou a produção de concentrado de minério de ferro dentro das especificações de pellet feed da Samarco, a partir de amostra representativa do overflow dos ciclones deslamadores (101,6mm, 4") do concentrador I da Samarco. Os ensaios incluíram estágios de microdeslamagem e flotação. O método de microdeslamagem desenvolvido mostrou-se eficiente e o concentrado produzido por flotação catiônica reversa apresentou teor de sílica compatível com o exigido para pellet feed.

With regard to a deep-extend oxidized refractory lead-zinc ore from Yunnan province, containing 4.55% Pb and 17.09% Zn, a test study was carried out. By adopting single-stage roughing, single-stage scavenging, two-stage cleaning in the flotation of lead oxide ores, and single-stage cleaning, single-stage cleaning in the reverse flotation of zinc oxide ores, bulk concentrate of lead and zinc containing 36.60% Pb, 19.63% Zn with the Pb recovery of 82.45%, zinc concentrate containing 36.52% Zn, 0.44%Pb with the Zn recovery of 73.18% were obtained in the closed circuit experiment.

This paper describes the hematite beneficiation technology progress and equipment,the current research has through biological flotation, flotation and selective aggregation separation process for separating iron minerals.Can reach a maximum of iron grade of 67.50%, metal recovery rate of 75% of the final concentrate of current hematite beneficiation process for gravity separation magnetic separation reverse flotation process.

In order to better exploit and utilize the oolitic hematite ore resource in Zhangjiakou region, staged grinding-separation process consisting of high intensity magnetic separation(HIMS) and reverse floatation was adopted in the beneficiation test on the regionally representative oolitic hematite ore of Longyan Iron Mine, Xuan Stee1. The test results indicate that，with Slong pulsating high gradient magnetic separation as HIMS equipment，with NaOH，starch，CaO and TS as flotation reagents，and at a grind of 65％ -200 mesh for the primary grinding and 95％-200 mesh for the secondary grinding，an iron concentrate grading 62.34％ and having an iron recovery of 53.07％ can be achieved after two stage HIMS and one roughing—one cleaning reverse flotation.

The concentration of phosphate flotation concentrate with P2O5 grade lower than the commercially acceptable phosphate quality was upgraded in the use of tribo-electrostatic technique. The concentration of the flotation concentrate stream was conducted under both triboelectrification and inductive charging mechanism. Mineralogical analysis reveals that the phosphate ore utilized was dominated mainly by fluorapatite, crandallite, wavellite, and with quartz as the major gangue mineral. Flotations concentrate of about 28.87% P2O5 was obtained from the reverse flotation technique, after conditioning the phosphate ore at 80% passing 150 μm under Lilafloat. Constant parameters such as −6 kV charging voltage, 25 kV separating voltage, inlet air, different charger rotary speed and splitter distances were investigated. Commercially accepted grade of 35.50% P2O5 was attained after the second stage of separation with a recovery of 12.26%, another phosphate product of 34.02% P2O5 and 85.19% was also recovered under the same condition. Single stage of separation also shows a significant increase in the grade of the product obtained, with 33.41% P2O5 and 84.07% recovery achievable. The practicability of tribo-electrostatic separation technique for upgrading flotation concentrates resulted in a significant increase in grade for

According to the nature ofthe ore which containing hematite and magnetite,under the conditions,forexample,ore grade is 24.07%,the fitst fineness of grinding -200 mesh is 50%，thesecond fineness of grinding -200 mesh ismore than 93%, it is concluded that concentrating circuit consisting of firstgrind-Feebleness magnetic separation -high intensity magnetic separation，secondgrind-second-high intensity magnetic separation- reverse flotation .Ultimately, A concentrate with aproductivity of 18.90%，a grade of 65.21% TFe and the recovery of 51.29% was yielded.

It was determined through a large amount of beneficiation test to adopt stage grinding-low intensity magnetic separation-high intensity magnetic separation-reverse flotation as the principle beneficiation flowsheet for a certain hematite in Hebei. The test results indicate that we can get iron concentrate with a grade of iron 65.19% and a recovery of iron 63.17% respectively at iron concentrate 21.90%, the primary grinding of 67.54%-200 mesh and secondary grinding of 97.70%-200 mesh.

The mineral processing experimental research was carried out on the hematite bearing characteristics of low grade, fine grain,complex composition. The results showed that using the technological flowsheet of “stage grinding- low intensity magnetic separation”, the iron concentrate with recovery of 36.56% and grade of 65.85% Fe can be obtained. And the iron concentrate with recovery of 17.23% and grade of 63.53% Fe can be obtained by “stage grinding-HIMS process-reverse flotation” process. The final iron concentrate with TFe grade of 65.10%,yield of 19.19% and total iron recovery of 53.79% from the raw ores with TFe grade of 23.41％ was obtained, with the first stage grinding size being 55% -0.074mm and the second stage,93% -0.074mm.

This article conducts mineral processing experimental study on a certain iron tailing ore in Hebei. According to the ore characteristics, the final flowsheet of stage grinding - weak magnetic - strong magnetic - anionic reverse flotation is determined to sort the ore. Under the conditions that grinding fineness is -200 mesh accounting for 60.0%, collector is butyl xanthate and activator is copper sulfate, this test can obtain zinc concentrate that grade is 36.25% and recovery is 84.15%

Phosphate being one of the three major nutrients required for agricultural plant growth usually presents as collophane in China. Since fine phosphate and other gauge minerals associate with each other and form intergrowth, the beneficiation of collophane is extremely difficult. In this paper, the flotation strategy for a low grade collophane ore from Guizhou province in China was studied in detail. Direct, reverse and direct-reverse combined flotation sheets were employed to collophane flotation. The results reveal that direct-reverse flotation is a suitable flotation flow sheet for this collophane ore. With direct-reverse flotation sheet, the grade of P2O5 in concentrate is 33%, which is improved by 3% comparing direct flotation and P2O5 recovery could achieve 80%. In addition, content of MgO decreased to 0.9%, which satisfied the requirement of wet-process phosphoric acid.

According to the ore nature of limonite in Xinjiang，use the technological process of one stage selectrifine high magnetic separation—reverse flotation to the limonite. the result show that at the fineness ore of -200order 60.0%, employ the closed-circuit process ,Limonite concentrates aining above 52.24％ Fe could be obtained at a productive rate of 54.04％ and a recovery of Fe about 67.03％ losed circuit tests, and the numble of finally tailing is 47.76%,29.08%and 32.97%.

Anhui hematite contains 43.21% of iron and 30.11% of silicon; it belongs to high silica refractory hematite. In this paper, reverse-flotation process was adopted to deal with the ore; as a result, good indexes can be obtained, which the iron concentrate grade is 61.76 % with 83.06% recovery. Flotation process can be carried out at room temperature, in comparison with anionic reverse flotation process, cationic reverse flotation can reduce the cost of ore processing. study.

In India, iron ores processing industries play a vital role in the Indian economy. During the washing and processing of iron ores, slimes less than 0.15 mm are generated and discarded into the tailing pond. These slimes need processing as they cannot be used directly in blast furnaces. In the present investigation, a typical iron ore slime sample containing 59.22% Fe, 4.76% SiO2, and 4.57% Al2O3 was taken. The desliming operation was carried out by using 2” Mozley hydrocyclone. The process variables used to attain the optimum condition of desliming include the spigot opening, the feed pressure, and the diameter of the vortex finder maintaining the pulp density at 10% solid. The deslimed sample was treated by different techniques including an enhanced gravity separator to achieve iron concentrate with 65% Fe so that it can be used for steel making through pelletization. The yield of the magnetic concentrate is about 46.8% with 65% Fe. To improve the yield, the overflow from 2” hydrocyclone and the rejects ...

The content of carbonate minerals in Dong Anshan iron ore was increasing in recent years, which deteriorated reverse flotation indices or even resulted in unclear separation between concentrate and tailing. In dodecylamine and sodium oleate systems, reverse flotation tests were undertaken with artificial mixed minerals of martite, quartz and siderite. Based on mineral flotation tests, the effect mechanism of siderite on reverse flotation were investigated in terms of SEM and EDS. Results showed that siderite was weakly depressed by starch, and the adsorption of siderite on hematite and quartz was the main cause for reverse flotation difficulties. In reverse flotation in dodecylamine system, the adverse effect of siderite on reverse flotation could be reduced when the amount of starch increased, and iron minerals and quartz were separated effectively. Therefore, the reverse flotation in dodecylamine system could be considered to realize separating effectively iron minerals and quartz of Donganshan iron ore containing carbonates, but which had high requirements on pH. Other methods were siderite being separated prior to reverse flotation or inventing flotation agents capable of effectively activating or depressing siderite.