Fluorammonium method of titanium slag processing

Dmitriev, Andrey N.; Смороков, А. А.; Kantaev, A. S.; Никитин, Д. С.; Vitkina, Galina Yu.

doi:10.17073/0368-0797-2021-3-178-183

Cited by 7 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The deposition of amorphous silicon dioxide, according to thermodynamic calculations, must be performed in the temperature range of 25-100 °C (Dmitriev et al, 2021). Silicon-containing sublimate was dissolved in water beforehand while maintaining the ratio of solid to liquid 1:10.…”

Section: Hydrolysis Of Silicon Fluoridesmentioning

confidence: 99%

“…Ammonium fluoride isused in the process of fluorination as a fluoride reagent, ammonium bifluoride or a mixture of them in a stream of inert gas, the sublimation products are captured with water to obtain a solution of ammonium fluorotitanate and sedimentation of hydrated titanium dioxide with aqueous ammonia, followed by heat treatment of the precipitate to obtain anhydrous titanium dioxide. In the work (Dmitriev et al, 2021), during the fluorination of titanium slag with ammonium hydrodifluoride, sublimation of hexofluoride occurs almost completely at a higher temperature of 380 °C; after sublimation of hexofluoride, titanium dioxide with impurities of other oxides remains in the solid product. There is a method of using another fluorinating agent ammonium fluoride NH 4 F (Fedun et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Processing of Titanium-Magnesium Production Waste

Karshigina¹,

Ultarakova²,

Lokhova³

et al. 2022

J. Ecol. Eng.

View full text Add to dashboard Cite

The article presents the results of research on the processing of such wastes of titanium-magnesium production as sludge from sludge dumps and fine dump dusts from the electric smelting of ilmenite concentrates. The results of nitric acid leaching of sludge with the transfer of calcium into solution and the production of calcium nitrate are given. Titanium-containing cake after nitric acid leaching of sludge and electric smelting dust cannot be returned to the technological process due to its high silica content, so the silicon impurity was removed from their composition. Silicon removal was performed by fluoroammonium processing with sublimation of hexafluorosilicate compounds. An amorphous silicon dioxide product was obtained, after ammonia hydrolysis of silicon-containing sublimations and appropriate treatment of the sediment. The residue from the sublimation of silicon fluorides consists mainly of titanium-containing phases and can be suitable for return for electrofusion after ammonia treatment.

show abstract

Section: Hydrolysis Of Silicon Fluoridesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Processing of Titanium-Magnesium Production Waste

Karshigina¹,

Ultarakova²,

Lokhova³

et al. 2022

J. Ecol. Eng.

View full text Add to dashboard Cite

show abstract

“…In [23], during the fluorination of titanium slag with ammonium hydrofluoride, at 380 • C, the degree of sublimation of ammonium hexafluorosilicate was 99%, after sublimation of silicon hexafluoride, titanium dioxide with impurities of other oxides remained in the solid product. The separation of titanium dioxide from other components was carried out using a solution of ammonium hydrofluoride.…”

Section: Introductionmentioning

confidence: 99%

Technology for Complex Processing of Electric Smelting Dusts of Ilmenite Concentrates to Produce Titanium Dioxide and Amorphous Silica

Karshigina

Ultarakova

Lokhova

et al. 2022

Metals

View full text Add to dashboard Cite

This paper presents the results of research on the development of a technology intended to process electric smelting dusts of ilmenite concentrate with the extraction of silicon and titanium and the production of products in the form of their dioxides. Dusts were processed for silicon separation using the ammonium fluoride method. The optimum conditions for the fluorination and sublimation process of silicon compounds from the electric smelting dust of the ilmenite concentrate were determined: a temperature of 260 °С, a 6 h duration, and mass ratio of dust to ammonium bifluoride of 1:0.5 ÷ 0.9. The sublimation degree of silicon compounds was ~84–91%. The sublimation of titanium fluorides from the remaining sinter was carried out at a temperature of 600 ± 10 °C for 2 h, the mass ratio titanium-containing residue: ammonium bifluoride of 1:0.5, and the degree of sublimation of titanium fluorides was 99%. Iron, manganese, and chromium impurities in the sublimation of titanium fluorides sublimate to a rather low degree. Pyrohydrolysis of titanium fluoride sublimes at 600 °C and allows for the conversion of fluorides into titanium dioxide by 99.5% in 4–5 h. Titanium dioxide of rutile modification with 99.8% TiO2 was obtained after hydrochloric acid purification and calcination. A technological scheme for the complex processing of dust from the electric smelting of ilmenite concentrates with the production of silica and titanium dioxide is proposed.

show abstract

“…A literature review showed that ammonium fluorides can be considered as the main reagents for processing chemically stable oxides and other oxygen-containing compounds. Well known is the use of a melt of ammonium fluorides as a reagent for processing the most chemically stable oxygen-containing compounds and also minerals (tantalite, 11 laterite, 12 monazite, 13 spodumene, 14 trinitite, 15,16 zircon, [17][18][19][20][21][22] ilmenite, 23 titanomagnetite, 24,25 polymetallic slags, 26 etc.) and pure oxides (plutonium dioxide, 27 thorium dioxide, 28 lanthanum, neodium and gadolinium, 29 etc.).…”

Section: Introductionmentioning

confidence: 99%

A novel low‐energy approach to leucoxene concentrate desiliconization by ammonium bifluoride solutions

Смороков

Kantaev

Bryankin

et al. 2022

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND: Despite the large reserves of titanium ores, their treatment by basic approaches to obtain titanium products is not always economically feasible due to various factors. One of these problems is the high content of silicon in the ores. RESULTS:The paper considers the desiliconization of a leucoxene concentrate with an aqueous solution of ammonium bifluoride. It was found that at 80 °C the main impurities, such as silicon and iron, pass into solution in the form of corresponding ammonium-fluorine complex compounds.CONCLUSIONS: The degree of desiliconization was up to 99%. Aluminium reacts with ammonium bifluoride, but is almost not leached into solution due to its low solubility. Titanium does not react due to its relatively higher reaction Gibbs energy among other metals in reaction with ammonium bifluoride. The content of titanium oxide in the calcined leaching residue was 85.52 wt%. The resulting residue corresponds to the raw material used in industry for the production of titanium dioxide pigment or titanium metal by the chlorine method. Iron and silicon can be precipitated from the leaching solution. Furthermore, the resulting filtrate can be evaporated in order to regenerate and reuse ammonium bifluoride.

show abstract

Fluorammonium method of titanium slag processing

Cited by 7 publications

References 10 publications

Processing of Titanium-Magnesium Production Waste

Processing of Titanium-Magnesium Production Waste

Technology for Complex Processing of Electric Smelting Dusts of Ilmenite Concentrates to Produce Titanium Dioxide and Amorphous Silica

A novel low‐energy approach to leucoxene concentrate desiliconization by ammonium bifluoride solutions

Contact Info

Product

Resources

About