uses of fluoride in flotation of chromite

Recover Chromite by Flotation - 911 Metallurgist

Apr 06, 2021  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-mesh.

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Flotation of Chromite Ore

Jun 05, 2017  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 preliminary desliming. This was

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Flotation of chromite and serpentine - ScienceDirect

Jun 15, 2007  The application of fluoride in the process was patented a long time now . The effects of pretreatment and aging on chromite flotation were studied with sodium dodecyl sulphate and dodecyl ammonium chloride as collectors . The main interest in the flotation properties of serpentine (i.e. a ...

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US4311584A - Amine flotation of chromite from acidic

chromite ore flotation sub pounds Prior art date 1980-11-12 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US06/206,246 Inventor Gregory E. Smith Jerry L. Huiatt ...

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Chromite- mineralogy and processing - ScienceDirect

Jan 01, 1988  Selective flotation is usually achieved in the acid pH range 1.5-6, selectivity sometimes being improved by the use of depressants, such as sodium fluoride and sodium fluosilicate. Several studies have also shown that the flotation behaviour of chromite can be modified by heat treatment, although the mechanism is complex.

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US2469422A - Selective flotation of chromite ores -

US2469422A US514987A US51498743A US2469422A US 2469422 A US2469422 A US 2469422A US 514987 A US514987 A US 514987A US 51498743 A US51498743 A US 51498743A US 2469422 A US2469422 A US 2469422A Authority US United States Prior art keywords treatment concentrate pulp flotation froth Prior art date 1943-12-20 Legal status (The legal status is an assumption and is not a

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Froth flotation of fluorite: A review - ScienceDirect

Apr 01, 2021  Fluorite (CaF 2), mainly composed of calcium fluoride, has a cubic crystal structure with a space group of Fm-3 m, having a = b = c = 0.5463 nm and α = β = γ = 90° [], as shown in Fig. 3.The calcium atoms are eightfold coordinated to eight surrounding fluorine atoms at a distance of 0.237 nm. Conversely, the fluorine atoms are surrounded by four calcium atoms, forming ideal tetrahedrons.

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Iron Chromite – Applications and General Uses African ...

Mar 10, 2021  Iron Chromite – Applications and General Uses. Iron chromite is the naturally occurring ore of chromium that is prized for its refractory abilities - making it invaluable in the modern foundry for the most demanding tasks at temperature. Not only this, but chromite finds wide uses even where high temperatures aren’t required.

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Separation of Chromite From Magnetite - Froth Flotation ...

To participate in the 911Metallurgist Forums, be sure to JOIN LOGIN; Use Add New Topic to ask a New Question/Discussion about Flotation.; OR Select a Topic that Interests you.; Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent). Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.; Use Add Comment = to comment on someone else’s ...

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Chromite beneficiation process

Jan 16, 2017  Chromite embedded in the grain size is generally in the fine particles, so most of the equipment used also includes crusher, rod mill, etc., chromite re-election equipment to determine the ...

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Acidic medium flotation separation of chromite from ...

Nov 01, 1997  It was demonstrated that, when Na-oleate is used as collector, chromite, olivine and serpentine can be separated at pH 2.5 and/or pH 5.5 when employing ethylene-diamine tetraacetate (EDTA) on previously deslimed material. This approach ensures flotation concentrates with a Cr 2 O 3 content better than 50% with a recovery of more than 75%.

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The flotation behaviour of chromite with respect to the ...

It is generally considered that chromite is naturally hydrophilic and only reports to the concentrate by entrainment. However, it is possible that, under certain conditions, the chromite can be activated by the typical reagent suite used in the flotation of UG2 ore, rendering it hydrophobic and amenable to

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Beneficiation of fluorspar by column flotation Request PDF

The characteristics and advantages of column flotation over conventional flotation were emphasized for several ores such as graphite (Narasimhan 1972), molybdenum (Mathieu 1972), chromite (Mckay ...

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NIOSHTIC-2 Publications Search - 10002738 - A Review of ...

This paper reviews the major deposits of lower grade chromite in the world and a wide variety of methods used for the recovery of chromium from these deposits. Gangue materials in more coarsely sized ores can be separated by gravity means, whereas flotation techniques are required for finer grained materials. However, unless there is considerable iron in the ores, physical means cannot

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Five Chrome Extraction Process to Teach you the Chromite ...

Sep 25, 2020  Flotation process. At present, we can use the flotation process to recover the chromite with fine grain size (-100um) after the gravity separation. The results show that Mg2+ and Ca2+ can inhibit the chromium ore, and the inhibition of Mg2+ is influenced by the type of anions in the slurry.

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Separation of Chromite From Magnetite - Froth Flotation ...

To participate in the 911Metallurgist Forums, be sure to JOIN LOGIN; Use Add New Topic to ask a New Question/Discussion about Flotation.; OR Select a Topic that Interests you.; Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent). Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.; Use Add Comment = to comment on someone else’s ...

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US2959281A - Flotation of niobium-bearing minerals ...

US2959281A US784391A US78439158A US2959281A US 2959281 A US2959281 A US 2959281A US 784391 A US784391 A US 784391A US 78439158 A US78439158 A US 78439158A US 2959281 A US2959281 A US 2959281A Authority US United States Prior art keywords flotation niobium concentrate minerals mica Prior art date 1958-12-31 Legal status (The legal status is an assumption and is not a

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Journal of Applied Chemistry and Biotechnology: Vol 21, No 1

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(PDF) Sources and Toxicity of Hexavalent Chromium

May 20, 2011  Hexavalent chromium is known to have 100-fold more toxicity than trivalent chromium, for both acute and chronic exposures because of its high water solubility and mobility, as well as easy ...

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flotation fluorite ores

Feb 15, 2020  Flotation of fluorite from ores by using acidized water ... May 01, 2013 1. Introduction. Fluorite flotation is usually realized with sodium lignosulfonate as depressant and fatty acid as collector at a high pH (Crozier, 1992, Ayhan et al., 2006).In the case where feed ores contain a significant amount of fine particles, the sedimentation rate of fine particles was found to be significantly ...

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Selective Recovery of Graphite from Spent Potlining (SPL ...

Oct 29, 2021  Flotation. Flotation experiments were carried out in a Denver D1 laboratory flotation device, using 1.5 l cell. First, 150 g of dry sample and 750 ml of fresh water were added in the cell and pH was controlled by the addition of NaOH or H 2 SO 4 solution. Subsequently, kerosene was added in the cell and conditioning was carried out at 500 rpm for 5 min. Methyl Isobutyl Carbinol (MIBC) frother ...

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Gravity concentration of sudanese chromite ore using ...

This criterion of density difference between chromite and the associated minerals suggests the use of gravity separation techniques for concentrating the low-grade chromite ores. This paper presents the results of an investigation on the concentration of a low-grade (30% to 35% Cr2O3) chromite ore from Chickay Mine, East of Sudan, using a ...

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fluorspar flotation ore

flotation fluorite beneficiation. fluorite beneficiation process in oman. copper ore fluorite ore iron ore gold flotation machine. And flotation process can be used to process fluorite ore that is associated with The crushing equipment used in fluorite ore dressing process is shown below. and other minerals beneficiation process, such as gold, tin and tungsten ore. there are many factors ...

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Chromate Conversion Coatings - NIST

The use and solution control of surface activators (most notably fluoride ion) allowed chromating reactions to proceed at a very rapid rate. In addition, when maximum corrosion resistance was required, accelerators such as the ferricyanide ion were used, especially on diffi- cult-to-treat alloys (Ref 3). The importance of having fluoride present in

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FLOTATION BEHAVIOR OF SUDANESE CHROMITE ORES

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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Beneficiation of fluorspar by column flotation Request PDF

The characteristics and advantages of column flotation over conventional flotation were emphasized for several ores such as graphite (Narasimhan 1972), molybdenum (Mathieu 1972), chromite (Mckay ...

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US10358693B2 - Method of direct reduction of chromite with ...

A method of chromite reduction using cryolite (Na 3 AlF 6 ) as an additive. The cryolite used may be pure cryolite or an impure mixture containing cryolite, such as the bath material produced as waste or as a by-product of aluminum smelting processes. In one embodiment, the reduction product is re-melted at a higher temperature to form larger metallic particles.

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THE USE OF COLUMN FLOTATION FOR THE RECOVERY OF

Column flotation devices were re-introduced for mineral processing in the late-1960’s in Canada by Boutin and Wheeler (1967) at which time wash water addition to the froth was used to eliminate entrainment of hydrophilic materials to the float product. By the late-1980’s column flotation had became a proven industrial

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Gravity concentration of sudanese chromite ore using ...

This criterion of density difference between chromite and the associated minerals suggests the use of gravity separation techniques for concentrating the low-grade chromite ores. This paper presents the results of an investigation on the concentration of a low-grade (30% to 35% Cr2O3) chromite ore from Chickay Mine, East of Sudan, using a ...

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Manual of Procedure for Chemical and Instrumental Analysis of

6.1 determination of dissolved fluoride, chloride, nitrate, orthophosphate, sulphate ions using ion chromatographic method 199 6.2 analysis of sodium potassium in water, waste water, effluents, solids, soils etc. using flame photometer 201 6.3 determination of turbidity in water, waste water using turbidity meter/nephelometer 203

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On the Management of Gangue Minerals in the Flotation of ...

Dec 05, 2018  The Bushveld Complex of South Africa contains almost 90% of the world’s reserves of platinum group minerals (PGMs). In the flotation of PGMs, there are significant challenges arising from the need to treat ever-decreasing grades of the relevant ore deposits. The major challenge in the flotation of these ore bodies is the control and management of the gangue minerals, particularly

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Chromium - Wikipedia

Chromium is a chemical element with the symbol Cr and atomic number 24. It is the first element in group 6.It is a steely-grey, lustrous, hard, and brittle transition metal. Chromium is the main additive in stainless steel, to which it adds anti-corrosive properties.Chromium is also highly valued as a metal that is able to be highly polished while resisting tarnishing.

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A Process Mineralogical Evaluation of Chromite at the ...

Aug 12, 2020  A process mineralogical study based on three texturally and mineralogically different chromite-bearing ore types at the Nkomati nickel mine was undertaken, with focus on chromite. Chromite is a by-product of the Ni-Cu-Co-PGE ore at Nkomati Nickel mine. These being the PCMZ_MG (medium-grade Ni-Cu sulphide silicate ore with disseminated chromite), PCMZ_HG (high-grade Ni

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Chrome Ore Beneficiation Process Chromite Processing ...

May 15, 2019  3.1 Chrome magnetic separation process. The chrome raw ore is a flotation tail ore, which is mainly formed in the chromite, and the chromite is the target recovering mineral. The dissociation degree of ferrochromium ore is low, and it has a weak magnetic property. First of all, magnetic separation processing to separate chromite.

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Sudan Fluorite Ore Flotation Machine Price

Today the term fluorspar is primarily used for the industrial and chemical form of fluorite while fluorite is the term used in reference to the gem and mineral Get Price Fluorite mineral Britannica Fluorite is used as a flux in the manufacture of open hearth steel of aluminum fluoride of .

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Minerals Research Lab Reports Minerals Research Laboratory

Minerals Research Lab Reports. 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.

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Locating And Estimating Air Emissions From Sources Of Chromium

high aluminum or low chromium chromite ore, containing more than 20 percent aluminum oxide (Al-0.) and more than 60 percent • Chromite ores are generally classified according to the type of production process the chromite ore is eventually used in. Metallurgical chromite refers to the high chromium content chroiaite ore, chemical chromite to ...

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