Since most chromite ores are easily beneficiated with gravity concentration methods, flotation of chromite has not been widely applied or got commercial acceptance (Atalay and Ozbayoglu, 1992). This is the most essential issue of every gravity separation circuit in mineral processing plants, which causes loss of large fraction of the valuable ...
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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 ... Froth flotation of chromite with fluoride: : Havens: 209/166: 2173909: Ore dressing: : Kritchervsky: 209/166: 2014404: Concentrating chromite ores by ...
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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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The flotation of chromite from "slime fraction" of the gravity circuit of Kemi concentrator, Finland was studied. The main gangue minerals are chlorite, tremolite and talc. Amines or fatty acid collectors are normally used for this sort of mineral composition. Theoretically, a sufficient selectivity should be expected in the region where ...
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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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Modifying agents may be used to increase selectivity. Another work [11] considered the effect of Al 3+ on chromite flotation in detail. Collectors studied included laurate, dodecyl amine and several amphoteric surfactants. The application of fluoride in the process was patented a long time now [12].
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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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Chromite bricks are used to a considerable extent as linings for metallurgical furnaces, because of their neutral and refractory character. The bricks are usually made of crude chromite and coal tar but sometimes of chromite with kaolin, bauxite, or other materials. Chromium is a constituent of certain green, yellow, orange, and red pigments ...
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Froth flotation was used to upgrade this chromite ore. Oleic acid was used as collector. Several operating parameters influencing the floatability of the Sudanese chromite ores were …
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Fluorite (CaF 2) is widely used as a resource for various industrial productions [1, 2].It plays an essential role in the fields of cement, glass, ceramics, metallurgy, refrigeration, aviation, medicine, and chemical industries, as shown in Fig. 1 [3, 4].With the increasing need for development in relevant areas, many countries consider fluorite as a strategic resource.
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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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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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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. A process developed for one ore does not usually ...
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7.5 Chromite Ore Beneficiation at the Mines 7.5.1 Boula Mine Plant 7.5.2 South Kaliapani Mine COB (OMC) 7.5.3 Sukinda Chromite COB Plant, TISCO 7.6 References USES AND SPECIFICATIONS 8.0 Introduction 8.1 Metallurgical Uses 8.2 Ferro - Chrome 8.3 Refactory Uses 8.3.1 Application of Different Types of Chromite Based Refractories 8.4 In Chemicals
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The flotation method is mainly used to separate feldspar from silica sand, and can also be used to remove clay minerals such as mica and secondary iron from silica sand. The flotation method can be divided into 3 types: Fluorine and acid …
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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 modified slightly to permit flotation without …
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by the flotation of chromite at pH 3 with the same amine collector. In a typical procedure, 270 gltof amine is fed into the flotation medium in the serpentine flotation step, while 270gltof amine isadded in the chromiteflotation step. From an ore assaying 36% CrZ03, a flotation concentrate can be obtainedcontaining45.4% CrZ03with ...
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Chromite grades vary between 3–5% in the Merensky Reef and the Platreef, and 5–15% in the UG2 reef (Engelbrecht, 2012). The chromite could adversely influence flotation of the PGM minerals, and recent flow sheet configurations use gravity separation spiral circuits to remove chromite before flotation. This can be
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Finely ground acid grade calcium fluoride. CaF2: Dry: 1.0 to 3.0: Used with sulphuric acid to release fluoride ion required in selective flotation of feldspar from quartz. Fuel Oil Petroleum oils of various grades. Undiluted liquid .5 to 2.5: Used for froth control and also in flotation of various metallics and non-metallics. Glue
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Maximum flotation of chromite occurs in the region where CuOH+ is formed, suggesting high concentrations of copper ions on the chromite surface lead to adsorption of xanthate and dithiophosphate and subsequent flotation. At higher pH values where Cu(OH)2 is precipitated as the dominant species the activation is reduced and is strongly dependent ...
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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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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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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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The optimum conditions obtained from the flotation of high grade chromite and clean serpentine minerals were applied to the flotation of the low grade chromite ore sample. Low grade chromite ore (containing 20.27% Cr 2 O 3 and ground to pass %100-180µm) was used in the flotation tests using the 2-liter flotation machine.
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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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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 experimental results indicate that flotation can occur by two different mechanisms, dependent on the pH of the system and on the absence or presence of added metal ions. Below pH 10 …
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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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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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The custom smelters which buy concentrates for smelting and refining usually use a blending of different concentrates in order to obtain a suitable feed for the plant. The maximum acceptable fluorine content for this concentrate mixture is about 500 ppm. ... An alternative is often tried by depressing the fluorine bearing minerals in flotation ...
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To improve selectivity, various depressants have been used. These include sodium fluoride (Sullivan and Wodkentine, 1964; Sullivan and Stickney, 1960) and sodium fluosilicate …
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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. It seems that hydrofluoric acid could be adsorbed strongly and preferentially …
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The Minerals Research Laboratory is a world leader in research, development, and implementation of mineral processing techniques. The MRL is part of the North Carolina State University College of Engineering, under the management of the NC State Industry Expansion Solutions. Introduction This page lists public mineral beneficiation reports prepared by the …
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a soluble fluorine compound capable of yielding fluoride ions under acidic conditions is employed. 1 While agglomeration tabling concentrating treatments, bulk flotation and similar mineral concentrating treatments involving selective filming of one or more ore constituents can be employed, it is preferred to employ a froth flotation concentration involving agitation and …
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