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.

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 done by preconditioning the pulp with fuel oil and fluoride

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 ...

US4311584A - Amine flotation of chromite from acidic pulps ...

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 ...

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

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 ...

Selective separation of phosphate and fluoride from ...

Selective separation of phosphate and fluoride from the semiconductor wastewater, containing 936 mg/L of fluoride, 118 mg/L of phosphate, 640 mg/L of sulfate, and 26.7 mg/L of ammonia, was studied. Chemical precipitation and flotation reactions were utilized in the two-stage treatment processes. The first-stage reaction involved the addition of ...

flotation of chromite from the silica

Flotation Of Chromite From The Silica. heavy minerals concentration and glass-grade silica ,minerals such as zircon, kyanite, sillimanite. chromite, corundum, and andalusite are limited to for producing flat-glass-grade silica by froth flotation. this was..fluoride activation in the flotation of chromite,hydrofluoric acid also attacks the silicon sites at p h i tion of chromite from silicate ...

US2469422A - Selective flotation of chromite ores - Google ...

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

Flotation behavior of chromium and manganese minerals

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

(PDF) Chromite - ResearchGate

According to data from the International Chromium Development Association, global chromite use was 29.4 metric tons in total (each unit equals 1000 kg) in 2014, used 96% in metallurgical, 2% in ...

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%.

Chromite beneficiation process

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 ...

Properties and Uses of Chromium - Science Struck

Properties of Chromium. Chromium is the 22nd most abundant element found on the Earth’s crust, but it never occurs as a free metal. It is mainly extracted from the mines as chromite ore. Chromium melts at 2180 K or 3465°F, and its boiling point is 2944 K or 4840°F. Its atomic weight is 51.996g/mol, and Moh’s hardness is 5.5.

chromium | Uses, Properties, & Facts | Britannica

Occurrence, uses, and properties. Chromium is a relatively abundant element in Earth’s crust; the free metal is never found in nature. Most ores consist of the mineral chromite, the ideal formula of which is FeCr 2 O 4.It is widely dispersed in natural deposits, which are usually contaminated with oxygen, magnesium, aluminum, and silica; their chromium content varies from 42 to 56 percent.

Best Flotation Of Chromite

Fluoride activation in the flotation of chromite - Wiley Online Library. to fluoride activation in soap and aniine .flotation were studied. Hydrofluoric acid was shown to have good selective properties in amitie flotation of chromite that. Read more

Traditional Dry Chromite Separation Techniques

Separation Chromite Magnetic. Acidic Medium Flotation Separation Of Chromite From FLOTATION BEHAVIOR OF SUDANESE CHROMITE ORES 1 Flotation offers an alternative concentration process for the separation of the fine materials hydrofluoric acid sodium fluoride or sodium silicofluoride in the flotation medium fines chromite the medium particles and olivine the coarse chromite sample and a

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

If the address matches an existing account you will receive an email with instructions to retrieve your username

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.

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

11.5 Refractory Manufacturing

Chromium is used in several types of nonclay refractories, including chrome-magnesite, (chromite-magnesite), magnesia-chrome, and chrome-alumina. Chromium compounds are emitted from the ore crushing, grinding, material drying and storage, and brick firing and finishing processes used in producing these types of refractories.

Acidic Medium Flotation Separation Of Chromite From ...

FLOTATION BEHAVIOR OF SUDANESE CHROMITE ORES 1 ... Flotation offers an alternative concentration process for the separation of the fine materials ... hydrofluoric acid, sodium fluoride or sodium silicofluoride in the flotation medium. ... fines, chromite the medium particles and olivine the coarse. ... chromite sample and a high grade serpentine using sodium oleate as the collector.

Traditional Dry Chromite Separation Techniques

Separation Chromite Magnetic. Acidic Medium Flotation Separation Of Chromite From FLOTATION BEHAVIOR OF SUDANESE CHROMITE ORES 1 Flotation offers an alternative concentration process for the separation of the fine materials hydrofluoric acid sodium fluoride or sodium silicofluoride in the flotation medium fines chromite the medium particles and olivine the coarse chromite sample and a

MINERAL PROCESSING BEHAVIORS OF CHROMITE CONTAINED

The optimum flotation size of chromite ranges from 60 to 100 mu m, and the floatability of it decreases with increase or decrease in particle size. AB - Degree of separation, grindability, zeta-potential, floatability, and magnetic property of chromite in the lateritic nickel-leached residue of Nonoc refinery (Philippines) were investigated.

The Characterisation of a Two Stage Flotation Circuit ...

1. 2. 5. 2 The optimum flotation time 1.2.6 The effect of variables on flotation kinetics 1.2.6.1 Effect of mixing 1.2.6.2 Effect of air flow rate 1.2.63 Effect of particle size 1.2. 7 Flotation machines 1.2. 7 .1 Conventional mechanical flotation cells 1.2. 7 .2 Mechanical flotation machine design 1.2. 7 .3 Column flotation cell 1. 2.

Lower temperature flotation of carbonate-fluorite ores ...

Aug 24, 2010 · The authors provide insight into the problem of selective flotation of fluorite from carbonate-fluorite ores. It is found that oxyhydrate collectors used in combination with sodium fluoride provide rather high level of selectivity in fluoride flotation from poor high-carbonate ores and make it possible to eliminate high-temperature pulp treatment with acceptable reduction in the flotation ...

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.

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 ...

Fluorine - Wikipedia

Fluorine is a chemical element with the symbol F and atomic number 9. It is the lightest halogen and exists at standard conditions as a highly toxic, pale yellow diatomic gas. As the most electronegative element, it is extremely reactive, as it reacts with all other elements, except for argon, neon, and helium.. Among the elements, fluorine ranks 24th in universal abundance and 13th in ...

Commodities - Actlabs

Since other elements are required for the metallurgical use of chromite, chromite assays usually are combined with major oxide analysis. For example, Cr/Fe ratios are very important in assigning value to chromite as well as other deleterious elements. 8-Chromite XRF. Samples are dried at 105 °C prior to LOI or fusion as laterites can easily ...

Trithiocarbonates for PGM flotation

Merensky concentrate contains far less chromite and is used to dilute chromite fed to the smelter from the UG2 concentrator. To ensure the highest Merensky concentrate grade possible, large amounts of depressants are added to the rougher flotation banks in an

Process effluents and mine tailings: sources, effects and ...

Dec 19, 2016 · Water use and energy consumption in mining have been identified as two key business risks by the mining industry. Further, it is identified that future availability of water supply is a significant risk for the hard rock mining sector and a range of treatment methods for mitigating the impending risk are essential as competition for access to water increases with increased demand [].

Production of high purity fluorspar and barite ...

The ore used was the same as that used for the fluorspar flotation. The calcium fluoride rougher and cleaner tailings were decanted. The settled solids, containing about 22% barium sulfate, representing 90 to 95% of the barite originally contained in the ore were diluted to about 10% solids with water containing 120 ppm. dissolved solids.

Copyright © 2020.Company name All rights reserved.SiteMap