Tailored nanostructured zirconia polymorphs are prepared from zircon concentrate decomposition products

Rudkovskaya, L. M.; Pavlenko, Tamara; Pshenichny, R. N.; Омельчук, А. А.; Vishnevsky, A. A.

doi:10.1134/s0036023614040160

Cited by 1 publication

(2 citation statements)

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“…The furnace consists of two chambers: raw material loading (1) and melt drain (2). Bakor partition (7), dividing the bath into two chambers and overlapping the melt along the cross-section from top to bottom to a depth of 3/4 of the height, ensures the formation of a homogeneous melt in the first chamber and the continuity of its overflow and discharge from the second. Both chambers are equipped with high-speed mechanical stirrers (4), heating graphite electrodes (5), and thermocouples (6) for temperature control.…”

Section: Methodsmentioning

confidence: 99%

“…At the same time, alkaline methods make it possible to extract silicon (in the form of hydrated SiO2) and scandium from zircon, eliminating the formation of waste [7]. However, these technologies are not widely used in the industrial practice of obtaining high-purity zirconium and hafnium due to the relatively high cost of alkali, the complexity of its regeneration, and the high corrosiveness of the [8].…”

Section: Introductionmentioning

confidence: 99%

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Zircon processing in sodium carbonate melt

Mukhachev

Shevchenko

Yelatontsev

2023

IOP Conf. Ser.: Earth Environ. Sci.

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The process of alkaline zircon processing with soda and a mixture of soda with intensifying additives carbon and NaOH was studied. As a result, a complete exclusion of acid-soluble sodium zirconosilicate formation was ensured. The introduction of carbon into soda melt increased the agent’s reactivity due to the formation of highly reactive Na2O. At 1100 °C, the optimal amount of introduced carbon is 4 wt.%, while the duration of the process is reduced to 10 minutes. Zircon processing in two stages – at 1150 °C and 1000 °C with the soda addition from 2.5 to 4.0 wt.% provided the production of metazirconate and sodium silicate, excluding the transition of silicon to the solid phase, providing an opening degree > 99%. The novel bakor-lined electric furnace of high operational reliability has been successfully tested. Carbonization of the sodium silicate solution in the presence of water vapor ensures complete precipitation of hydrated silicon dioxide, with a bulk density of 150 g/L. The optimal concentration of CO2 is ~ 8%, which allows using off-gases from thermal power plants for carbonization. The presence of water vapor in the gaseous phase increases the utilization of CO2 and Na2CO3 regeneration.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%