Chromite mineral is belonging to the spinel group, the crystals are uncommon, but when found they are octahedral of cubic crystal. Generally, the chromite is usually massive or in the form of lenses and tabular bodies, or it may be disseminated as granules. Chromite is dark brown to black in color and can contain some magnesium and aluminum.
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It seems that hydrofluoric acid could be adsorbed strongly and preferentially on the chromite surface to give the extremely insoluble CrF 2− ion that exhibits great affinity for the positively …
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Froth flotation was used to upgrade this chromite ore. Oleic acid was used as collector. ... Oleic acid was used for flotation. Sodium fluoride and sulphuric acid yielded better results than dilute hydrofluoric acid when these reagents were added to free the 'flocs' from the siliceous gangue.
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Collector addition and chromite flotation can be repeated as many times as necessary until all the chromite is flotated with the total amount of amine collector addition ranging from 0.5 to 1.0 pounds of reagent per ton of feed. The rougher grade chromite concentrate obtained can be cleaned by reflotation for about 10 minutes at a pH less than ...
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Metallurgical-grade fluorite contains 60-85% calcium fluoride and is used primarily as a flux in steelmaking to lower the melting point of raw materials and remove impurities from molten metal. ... Flotation is the most common method used to concentrate fluorite and separate it from unwanted impurities. ... Start by exploring the 5 Chromite ...
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For the purposes of studying the effect of the froth phase on the recovery of chromite a column flotation cell is eminently suitable since it enables the froth height to be easily and well controlled. The present study makes use of a laboratory scale column flotation cell operated in continuous mode in open circuit to evaluate the effect of ...
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The responses of chromite and the gangue minerals olivine and serpentine commonly associated with it to fluoride activation in soap and anine flotation were studied. Hydrofluoric acid was shown to have good selective properties in amine flotation of chromite that qualify it as a possible flotation reagent.
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A flotation scheme, which introduced the use of a fluoride ion with a fatty-acid collector for selective recovery of chromite, was used in the initial studies. This method, developed and patented by Richard Havens, is applicable primarily to particle sizes between 48- and 200 …
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Mine chromite or in general concentration of similar low grade chrom ite deposits. An attempt was also made to increase the efficiency of chromite concentration by eliminating some of the loss of the finer sizes. Before the flotation tests the problem of Iron Determination in Chromite was presented to the writer by Mister M. D. O'Shaugh-nessy.
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The responses of chromite and the gangue minerals olivine and serpentine commonly associated with it to fluoride activation in soap and anine flotation were studied. Hydrofluoric acid was shown to ha...
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chromite flotation were studied with sodium dodecyl sulphate and dodecyl ammonium chloride as collectors [13]. The main interest in the flotation properties of serpentine
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The responses of chromite and the gangue minerals olivine and serpentine commonly associated with it to fluoride activation in soap and anine flotation were studied.Hydrofluoric acid was shown to ...
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Preconditioning with fuel oil permitted flotation of the chromite from the flocculated siliceous-gangue slimes. Recoveries of up to 91 percent were realized with products containing up to 45 percent Cr 2O3 [Hunter and Sullivan, 1960]. The Cr/Fe ratios ranged from 2.17 to 2.46. Oleic acid was used for flotation. Sodium fluoride and
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Deslimed chromite ore was floated at pH 1.5 to 5.5 using a long-chain fatty-acid collector and soluble fluoride ions as a silicate depressant. The Havens method was later …
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The application of fluoride in the process was patented a long time now [12]. The effects of pretreatment and aging on chromite flotation were studied with sodium dodecyl sulphate and dodecyl ammonium chloride as collectors [13]. ... The effect of pretreatment on chromite flotation was commented [13]. For instance, aging the ore in a stockpile ...
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As an important strategic non-metallic mineral resource, fluorite has been widely used in various industrial fields, such as metallurgy, optics and semiconductor manufacturing, as well as fluorine-related chemical engineering. Since the major gangue minerals of fluorite ore are silicate and carbonate ones, flotation is the main beneficiation method for the concentration.
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Chromium values are recovered from pulverized chromite ore by agitating and aerating an aqueous pulp of said pulverized chromite ore containing an amine collector at a pulp acidity less than 2.5; and recovering a chromite containing froth as a concentrate.
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Abstract: In this study, the concentration of chromite minerals by amine flotation of a chromite tailing (slime) with content 23.84% Cr 2O 3 from Yeşilova-Burdur (Turkey) was investigated. In ...
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Flotation of chromite was activated with HF at a pH of 5 for 5 min. Small incre-ments of oleic acid, totalling 70 glton of fines were used to collect the chromite. The rougher concentrate was …
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Chromite tailings assaying 21.2 per cent Cr2O3 was upgraded to 48.7 per cent Cr2O3 at a recovery of 72.0 per cent using column flotation with a mixture of anionic collectors at pH 11. Electrokinetic methods were used to elucidate the mechanism of collector adsorption and correlate the findings with the optimum flotation conditions. Multivalent constituent ions such …
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T 1091 ABSTRACT The flotation of chromite is studied as a function of the CHEMICAL COMPOSITION AND THE PH. Three collectors are used, dodecylamine, a sodium sulfonate, AND POTASSIUM OLEATE. From consideration of the experimental results, it is demonstra» TED THAT DODECYLAMINE AND SULFONATE ARE PHYSICALLY ADSORBED, WHILE
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The literature suggests the research effort to characterise the general flotation properties of chromite (chrome spinel with high chromium content) has been extensive and a substantial amount of data is available. However, the problem of separating a small amount of chrome spinel from a large amount of ilmenite requires a different approach to ...
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The chromite abundance in the flotation tailings (shaking table feed) increased to 65% and 64% in the PCMZ_MG ores at a target grind of P70-and P80 of 75 µm, respectively, from an abundance of 23% in the unprocessed ore. The chromite abundance at the finest grind (P90 of 75 µm), was lower than the P70-and P80 of 75 µm target grinds with an ...
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It seems that hydrofluoric acid could be adsorbed strongly and preferentially on the chromite surface to give the extremely insoluble CrF2− ion that exhibits great affinity for the positively …
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5. Summary and conclusions The chromite reserves in Sudan are mostly of low-grade. The chromite content ranges from 20% to 35% Cr2O3. This grade is too low for industrial uses. The froth flotation technique failed to upgrade this type of ore to the marketable grade.
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Based on the results, two flow sheets comprising gravity, magnetic separation and flotation, were used to recover chromite values. A chromite concentrate of 45.0% Cr2O3 with a Cr:Fe ratio of 2.3 ...
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chromite ((Fe²⁺, Mg) (Cr, Al, Fe³⁺)₂O₄) during flotation. While Fe₂O₃ is still present, its increase suggests that a portion of iron oxide is associated with the chromite mineral and was floated along with it. The moderate increase in MgO content (from 8.66% to 14.56%) suggests that some magnesium-bearing minerals were
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Subsequent flotation tests at natural pH on hot tailings samples with two stages of cleaning showed good upgrading, where a feed grade of 16.1 % Cr 2 O 3 after desliming was converted to a concentrate of 29.4 % Cr 2 O 3 at a yield, based on deslimed feed, of 28.6 % and a recovery of 52.4 %. The overall upgrade ratio in this case of 1.83 was slightly lower than those …
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：5 · A flotation scheme, which introduced the use of a fluoride ion with a fatty-acid collector for selective recovery of chromite, was used in the initial studies. This method, developed and patented by Richard. Consulta; Review of the reagents used in …
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hydrofluoric acid for selective flotation of chromite. However, Abido (1971) dis counts the notion that fluoride is an activator for soap flotation. In fact, it is reported that hydrofluoric acid is detrimental to soap flotation but is quite effective for selective amine flotation of chromite at pH 3.5-4.5 as shown in Figure 1.
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In this paper, the floatability of chromite and serpentine fine particles by sodium oleate was investigated in-depth, aiming to separation during mineral processing, i.e. to float …
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Chromite is an important strategic mineral usually associated with other gangue minerals, mainly silicates. A good knowledge of the flotation behaviour of chromite and the establishment of ...
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Uses Of Fluoride In Flotation Of Chromite Fluorite ore gold ore concentrator equipment.Summary of fluorite ore flotation process jxsc.2019822quartz type fluorite orehe separation of quartz and fluorite achieved by grinding it is an ...
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For the tests using etheramine, amidoamine, oleate, and starch, a conditioning time of 5 min was used. Flotation was performed at pH 10 with dosages of 300 g/t (this dosage was determined by the studies that will be shown later) for the three collector reagents and 1000 g/t for starch. However, for the tests with oleate, additional tests were ...
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The application of fluoride in the process was patented a long time now [12]. The effects of pretreatment and aging on chromite flotation were studied with sodium dodecyl sulphate and dodecyl ammonium chloride as collectors [13]. The main interest in the flotation properties of serpentine (i.e. a hydrated magnesium silicate) arises from the ...
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Froth flotation of chromite with fluoride . United States Patent 2412217 . Abstract: The invention described herein may be manufactured and used by or for the Government of the United States for governmental purposes without the payment to me of any royalty thereon in accordance with the provisions of the act of April 30, 1928 (Ch. 460, 45 Stat ...
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It seems that hydrofluoric acid could be adsorbed strongly and preferentially on the chromite surface to give the extremely insoluble CrF2− ion that exhibits great affinity for the …
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What are Flotation Activators used for? The function of activators is to render floatable those minerals which normally do not respond to the action of promoters. Activators also serve to render floatable again minerals which have …
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was used as the cationic collector for chromite flotation. The other reagents included hydrofluoric acid (Merck), which acted as an activator. In order to stabilize the froth, small quan-tity of polypropylene glycol was used. In addition, tannic acid and sulfuric acid were used to act as depressant and pH regu-lator, respectively. Results and ...
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