Studying the Possibility for Defluorination of Calcium and Rare-Earth Fluorides by Ammonium Sulfate

Крысенко, Г. Ф.; Эпов, Д. Г.; Merkulov, E. B.; Медков, М. А.

doi:10.1134/s0040579521320026

Cited by 6 publications

(6 citation statements)

References 3 publications

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“…It should be noted that during the fluorination of mineral raw materials with NH 4 HF 2 , sparingly soluble fluorides of some elements (calcium, magnesium, rare earth elements) can be formed. At the same time, as we have shown earlier [6], poorly soluble fluorides can be converted into more soluble compounds, sulfates, by solidphase interaction with ammonium sulfate.…”

Section: Processing Of Titanium-containing Raw Materials Using Ammoni...supporting

confidence: 58%

“…Следует отметить, что при фторировании минерального сырья NH 4 HF 2 образуются малорастворимые фториды некоторых элементов (кальция, магния, редкоземельных элементов). В то же время, как было показано нами ранее [6], малорастворимые фториды могут быть переведены в более растворимые соединения -сульфатытвердофазным взаимодействием с сульфатом аммония.…”

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Processing of Titanium-Containing Raw Materials Using Ammonium Hydrodifluoride and Sulfate

Medkov,

Krysenko,

Epov

et al. 2023

XVI INTERNATIONAL CONFERENCE "METALLURGY OF NON-FERROUS, RARE AND NOBLE METALS" Named After Corresponding Member of the RAS Gen

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Currently, there are two main technologies for processing of titaniumcontaining concentrates in industry: sulfuric acid and chlorine, the main raw materials for which are rutile, ilmenite, and titanomagnetite. However, the structure of domestic titanium-containing raw materials is distinguished by a large proportion of non-traditional sources, being simultaneously titanium-containing, inferior in titanium content to traditional types of titanium raw materials - ilmenite and rutile - and rare-metal raw materials,which requires the creation of new technical solutions.

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Section: Processing Of Titanium-containing Raw Materials Using Ammoni...supporting

confidence: 58%

unclassified

Processing of Titanium-Containing Raw Materials Using Ammonium Hydrodifluoride and Sulfate

Medkov,

Krysenko,

Epov

et al. 2023

XVI INTERNATIONAL CONFERENCE "METALLURGY OF NON-FERROUS, RARE AND NOBLE METALS" Named After Corresponding Member of the RAS Gen

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“…В то же время отмечены случаи не полного растворения профторированных образцов, содержащих алюминий, из-за пассивации фтором поверхности гиббсита [8], а также некоторых образцов, содержащих щелочноземельные и редкоземельные элементы [2]. Твердофазное взаимодействие фторидов кальция и РЗЭ с сульфатом аммония при температуре 350-400 ℃, как было отмечено выше, приводит к образованию более растворимых, чем фториды, сульфатов этих элементов [5,6]. В этой связи представляло интерес сравнить возможности вскрытия геологических образцов с использованием с одной стороны NН 4 НF 2 , а с другойсмеси NН 4 НF 2 с (NН 4 ) 2 SО 4 .…”

Section: результаты и обсуждениеunclassified

“…В то же время, как показано в [5,6], малорастворимые фториды, например, кальция и РЗЭ могут быть переведены в более растворимые сульфаты твердофазным взаимодействием с сульфатом аммония.…”

Section: Introductionunclassified

Development of approaches to the creation of technology for extracting "invisible" gold from the ores of the Sukhoe deposit (Primorye)

Molchanov

2022

Vestn. Voronež. gos. univ. inž. tehnol.

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In the south of the Far East, a large deposit of Sukhoe gold has been identified, where the noble metal is in a dispersed form, being present in the form of microscopic particles, or entering the structure of sulfide minerals. It was found out that the «invisible» (nano) form of finding gold is mainly associated with pyrite and arsenopyrite. To develop a technology for extracting a useful component, the completeness and convenience of opening the stone material with the transfer of all components into a solution is crucial. The article presents the results of a study of the possibility of preparing samples of mineral raw materials for the analytical determination of the elemental composition by thermal treatment of samples with a mixture of ammonium hydrodifluoride NH4HF2 and ammonium sulfate (NH4)2SO4. Based on a comparative analysis, it was shown that when using a mixture of ammonium hydrodifluoride with ammonium sulfate, it is possible to more fully open the mineral raw materials compared to using only ammonium hydrodifluoride. A mixture of NH4HF2 with (NH4)2SO4 is recommended as a new promising reagent for the decomposition of ores with "invisible" gold.

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“…On the other hand, as shown in [9,10], sparingly soluble fluorides, such as calcium and rare-earth elements, can be transformed into more soluble sulfates by solid-phase interaction with ammonium sulfate.…”

Section: Introductionmentioning

confidence: 99%

Extraction of useful components from ilmenite-titanomagnetite ores of Sikhote-Alin (Russia)

Molchanov

2023

E3S Web Conf.

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In the south of the Far East of Russia, a new source of critically important metals (titanium and iron) has been discovered - ilmenite-titanomagnetite ores of mafic-ultrabasic rocks of the Sikhote-Alin orogenic belt. On the example of one of these massifs, Kokshaarovsky, the possibilities of decomposition of mineral raw materials are conducted with using hydrometallurgy methods are considere. The opening of the studied mineral raw materials was carried out by means of using ammonium hydrofluoride NH4HF2 and ammonium sulfate (NH4)2SO4 with subsequent complete transfer of useful components into solution. It has been established that the use of a mixture of these reagents makes it possible to more fully open titanium-containing rocks. The experience of deep processing of ilmenite-titanomagnetite ores will allow outlining the ways for the industrial development of complex deposits of the Far East.

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Studying the Possibility for Defluorination of Calcium and Rare-Earth Fluorides by Ammonium Sulfate

Cited by 6 publications

References 3 publications

Processing of Titanium-Containing Raw Materials Using Ammonium Hydrodifluoride and Sulfate

Processing of Titanium-Containing Raw Materials Using Ammonium Hydrodifluoride and Sulfate

Development of approaches to the creation of technology for extracting "invisible" gold from the ores of the Sukhoe deposit (Primorye)

Extraction of useful components from ilmenite-titanomagnetite ores of Sikhote-Alin (Russia)

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