Ammonium hexafluoridosilicates: Synthesis, structures, properties, applications

Gelmboldt, V. O.; Kravtsov, Victor Ch.; Fonarı, Marina S.

doi:10.1016/j.jfluchem.2019.04.005

Cited by 15 publications

(12 citation statements)

References 148 publications

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“…The advantages of NH 4 F and NH 4 HF 2 are the vigorous (energetic) interaction of the melt with silicon oxide, thus forming solid (NH 4 ) 2 SiF 6 [7]. When heated, (NH 4 ) 2 SiF 6 sublimes without decomposition, and when cooled, it desublimes.…”

Section: Silicon Dioxide Processingmentioning

confidence: 99%

“…Our studies have shown that fluorides react well with zircon at elevated pressures, that is, in an autoclave. 2) bunker for loading raw materials, (3) mixer screw, (4) drum rotary kiln, (5) ammonia absorber, (6) sublimation furnace, (7) condenser, (8) dissolution tank (NH 4 ) 2 SiF 6 , ( 9) tank for storing ammonia water, (10) reactor for precipitation of SiO 2 , ( 11) vacuum filter, and ( 12) oven for drying SiO 2 .…”

Section: Zircon Processingmentioning

confidence: 99%

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Ammonium Fluorides in Mineral Processing

D’yachenko¹

2022

Fluoride

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The possibility of using ammonium fluoride as a new reagent for processing mineral raw materials is considered. Ammonium fluorides are the most convenient and technological fluorinating agents for the decomposition of the silicon component of ores. Advantages the use of ammonium fluoride (or hydrodifluoride) as a desiliconizing agent, the possibility of its complete regeneration. The processes of deep processing of silicon, zirconium, titanium, and beryllium minerals are considered. The excellence of using ammonium fluoride in the processing of mineral raw materials have been proven. The physicochemical laws of the processes are considered, technological schemes are proposed. The material will be useful in the further introduction of fluoride technologies at enterprises for the processing of quartz, zircon, ilmenite, and phenakite.

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Section: Silicon Dioxide Processingmentioning

confidence: 99%

Section: Zircon Processingmentioning

confidence: 99%

Ammonium Fluorides in Mineral Processing

D’yachenko¹

2022

Fluoride

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“…Understanding that the presence of hydrophilic groups plays a key role in H-bonding and increases the aqueous solubility of compounds, we paid special attention to the influence of hydrogen bonds in the dissolution process. The conclusions readily apply to organic compounds but are complicated when considering organic salts or ammonium compounds [99]. [71] worked to develop SiRMS QSPR models to screen for the water solubility of ammonium hexafluorosilicates and to These interpretations coincide with generally accepted physico-chemical theories surrounding the effect of ammonium cations on the water solubility of the corresponding salts along with qualitative data of previous experimental works.…”

Section: Qspr Models Of Lipophilicity and Aqueous Solubilitymentioning

confidence: 99%

Simplex representation of molecular structure as universal QSAR/QSPR tool

et al. 2021

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We review the development and application of the Simplex approach for the solution of various QSAR/QSPR problems. The general concept of the simplex method and its varieties are described. The advantages of utilizing this methodology, especially for the interpretation of QSAR/QSPR models, are presented in comparison to other fragmentary methods of molecular structure representation. The utility of SiRMS is demonstrated not only in the standard QSAR/QSPR applications, but also for mixtures, polymers, materials, and other complex systems. In addition to many different types of biological activity (antiviral, antimicrobial, antitumor, psychotropic, analgesic, etc.), toxicity and bioavailability, the review examines the simulation of important properties, such as water solubility, lipophilicity, as well as luminescence, and thermodynamic properties (melting and boiling temperatures, critical parameters, etc.). This review focuses on the stereochemical description of molecules within the simplex approach and details the possibilities of universal molecular stereo-analysis and stereochemical configuration description, along with stereo-isomerization mechanism and molecular fragment “topography” identification.

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“…[ 7‐9 ] For example, in a recently published review [ 10 ] authors, based on the analysis of data from epidemiological studies, experiments on animals, and in vitro, dispute the viewpoint discussed in the literature on the neurotoxicity of fluorides for humans at the levels of fluoride concentrations in drinking water, food, and oral hygiene products. [ 11,12 ] Of practical importance among the groups of fluorine‐containing compounds are ammonium hexafluorosilicates (AHFS) of general formula (LH) 2 [SiF 6 ] (L = ammonia or N‐containing organic bases), [ 13 ] which are usually obtained as products of fluorosilicic acid (FSA) utilization. In particular, complex (NH 4 ) 2 [SiF 6 ] is widely applied as an industrial fluorinating agent, reagent in the processes of modification of zeolite catalysts, and as intermediate in the production of amorphous silicon dioxide.…”

Section: Introductionmentioning

confidence: 99%

“…hexafluorosilicates (AHFS) of general formula (LH) 2 [SiF 6 ] (L = ammonia or N-containing organic bases), [13] which are usually obtained as products of fluorosilicic acid (FSA) utilization. In particular, complex (NH 4 ) 2 [SiF 6 ] is widely applied as an industrial fluorinating agent, reagent in the processes of modification of zeolite catalysts, and as intermediate in the production of amorphous silicon dioxide.…”

mentioning

confidence: 99%