Fluoride method of processing molybdenite concentrate

Karelin, V.A.; Shilkin, A.S.

doi:10.1109/spcmtt.2000.896088

Cited by 5 publications

(8 citation statements)

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“…Figures 4 and 5 for these reactions show the results of calculations of the change in Gibbs energies of the rutile in a temperature range of 298-510 K. The calculated values of the change in the Gibbs energy show that reactions ( 25)-( 32) are thermodynamically possible because the change in the Gibbs energy is negative throughout the whole studied temperature range. The addition of sodium fluoride leads to a decrease in the standard Gibbs energy by approximately 30 kJ/mol, and this difference is almost doubled with increasing temperature to 500 K. The exceptions are reactions (26) and (30). The temperature dependences of Gibbs energies for these reactions pass through a small minimum and then monotonically decrease in absolute value.…”

Section: Sulfate-fluoride Leaching Of Titanium From Rutilementioning

confidence: 99%

“…If we take into account that the removal of gaseous HF from the reaction zone displaces its equilibrium to the right according to the Le Chatelier principle, then it should be concluded that the rutile can be completely dissolved. Further, it should be noted that reactions (26), (28), (30) and (32) make it possible to reduce the molar ratio of NaF/TiO 2 from 2 to 1. However, the complete conversion of TiO 2 will require the use of an excess of fluorides in the reaction mixture because of possible losses of hydrogen fluoride during the leaching process.…”

Section: Sulfate-fluoride Leaching Of Titanium From Rutilementioning

confidence: 99%

“…Fluorination of ilmenite ores is described in the literature [30][31][32][33][34][35]. Fluorination reactions with F 2 [31] are governed by successive substitution of oxygen atoms by fluorine atoms on the surface of ore particles in a temperature range of 298-1800 K.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism, Thermodynamics and Kinetics of Rutile Leaching Process by Sulfuric Acid Reactions

et al. 2020

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Rutile decomposition by sulfuric acid, including the formation of two salts, Ti(SO4)2/TiOSO4, is thermodynamically modelled. It is shown that TiO2 can spontaneously dissolve in H2SO4 solutions. However, titania is considered as an inert (ballast) phase component of titanium-containing raw materials due to the decelerated separate nature of such chemical transformations. It is concluded that the hampered related kinetics of dissolution can be attributed to the lability of Ti(IV) cations/the specific engineered features of the hierarchical crystalline structure. It is suggested that the breaking of Ti–O–Ti bonds without additional mechanical strains in crystal lattice geometry becomes more advantageous when smaller negative anions/fluoride ions can be used. The analysis of sulfate-fluoride extraction leaching of titanium confirmed that a decrease in the Gibbs energy in the presence of F occurs. It is indicated by kinetic research studies that the addition of corrosive sodium reagent (NaF) reduces the activation by 45 kJ/mol, which results in intensification. A mechanism is proposed for the interactions involving the Ti–O–Ti cleavage on the surface/the H2SO4-induced Ti dioxide degradation on the sites of defects. Moreover, F acts as a homogeneous/heterogeneous bifunctional catalyst.

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Section: Sulfate-fluoride Leaching Of Titanium From Rutilementioning

confidence: 99%

Section: Sulfate-fluoride Leaching Of Titanium From Rutilementioning

confidence: 99%

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Mechanism, Thermodynamics and Kinetics of Rutile Leaching Process by Sulfuric Acid Reactions

et al. 2020

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“…Физико-химическое обоснование приемлемости использования фторидной технологии и её преимуществ перед другими способами представлено в работах [13][14][15][16][17]. Фторид и гидрофторид аммония в свою очередь хорошо растворимы в воде и превосходят по реакционной способности многие другие неорганические фториды.…”

Section: Introductionunclassified

Influence of Fluoride Leaching on the Phase Composition of Titanomagnetite Ore: Data of Scanning Electron Microscopy

Орлов,

Сачков,

Князева

et al. 2023

Южно-Сибирский Научный Вестник

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Ванадийсодержащие титаномагнетитовые руды считаются одним из наиболее перспективных видов нетрадиционных руд и являются важным источником железа, титана и ванадия. Метод фторидной переработки с применением гидрофторида аммония является одним из наиболее перспективных, ввиду образования технологически приемлемых для дальнейшей переработки фторометаллатов аммония. В настоящей работе приводятся данные по морфологии и пространственному распределению элементов исходной титаномагнетитовой руды и твердого остатка после фторидной переработки. Для получения данных использовали метод сканирующей электронной микроскопии в режимах SE и BSE и проводили картирование по поверхности выбранной области. Минеральный состав представлен такими минералами, как ильменит, магнетит, титаномагнетит, магнезиоферрит, алюмосиликаты, кронстедтит и мейкснерит. Раствор NH4HF2 концентрацией 1 моль/л при 20°С позволяет извлечь Ti, Si, Alв форме фторометаллатов аммония и обогатить железом исходную руду. Таким образом, титаномагнетитовая руда Чинейского месторождения является перспективным сырьем и может быть переработана гидрометаллургическим способом по фторидной схеме. Vanadium-containing titanomagnetite ores are considered one of the most promising types of unconventional ores and are an important source of iron, titanium and vanadium. The method of fluoride processing using ammonium hydrofluoride is one of the most promising, due to the formation of ammonium fluorometallates, which are technologically acceptable for further processing. This paper presents data on the morphology and spatial distribution of the elements of the original titanomagnetite ore and the solid residue after fluoride processing. To obtain data, the method of scanning electron microscopy was used in the SE and BSE modes and mapping was carried out over the surface of the selected area. The mineral composition is represented by such minerals as ilmenite, magnetite, titanomagnetite, magnesioferrite, aluminosilicates, cronstedtite and meixnerite. A solution of NH4HF2 with a concentration of 1 mol/l at 20°С makes it possible to extract Ti, Si, Al in the form of ammonium fluorometallates and to enrich the original ore with iron. Thus, the titanomagnetite ore of the Chiney deposit is a promising raw material and can be processed by the hydrometallurgical method according to the fluoride scheme.

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“…The fluoride technology for processing uranium-containing fuels is one of the most promising technologies in modern practice [3][4][5]. The process in which a gas jet containing a dispersed solid phase comes in contact with a chemically active oxidizer gas flow is often used in various technologies.…”

Section: Introductionmentioning

confidence: 99%

Fluorination of a depleted uranium-plutonium-nitride fuel with elemental fluorine

2004

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A physical and a mathematical model have been developed to describe the physicochemical process of torch fluorination of an uranium-plutonium-nitride fuel. An algorithm for calculating the velocity, temperature, and concentration of the chemical components has been constructed which makes it possible to optimize the parameters and operating modes of a torch reactor based on mathematical simulation methods.

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Fluoride method of processing molybdenite concentrate

Cited by 5 publications

References 0 publications

Mechanism, Thermodynamics and Kinetics of Rutile Leaching Process by Sulfuric Acid Reactions

Mechanism, Thermodynamics and Kinetics of Rutile Leaching Process by Sulfuric Acid Reactions

Influence of Fluoride Leaching on the Phase Composition of Titanomagnetite Ore: Data of Scanning Electron Microscopy

Fluorination of a depleted uranium-plutonium-nitride fuel with elemental fluorine

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