Low-temperature desiliconization of activated zircon concentrate by NH4HF2 solution

Смороков, А. А.; Kantaev, A. S.; Bryankin, Daniil; Miklashevich, Anna; Kamarou, Maksim; Romanovski, Valentin

doi:10.1016/j.mineng.2022.107909

Cited by 12 publications

(7 citation statements)

References 24 publications

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“…The main reaction is (1). As a result of side reactions (2, 3, 7), water-insoluble zirconium compounds are formed, which leads to an undesirable transition of silicon into solution when the cake is leached with nitric acid according to the reaction:…”

Section: Resultsmentioning

confidence: 99%

“…Zircon is the main raw material for the production of high-purity zirconium and hafnium compounds for nuclear power plants. The zircon concentrate contains oxides of silicon and scandium, the associated extraction of which can improve the economic performance of the processing of raw materials, for example, by obtaining scarce silicon dioxide [1] or extraction of scandium oxide [2].…”

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: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Zircon processing in sodium carbonate melt

Mukhachev

Shevchenko

Yelatontsev

2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Waste recycling is one of the main components of sustainable development, green chemistry (Stahel, 2016;Nelles et al, 2016), and the circular economy (Pires and Martinho, 2019;van Ewijkand Stegemann, 2020). Known examples of the involvement of waste in the production complex are the production of pigments (Zalyhina et al, 2021a;b), materials for water and wastewater treatment (Romanovski et al, 2021a;Romanovskii and Martsul', 2009;Bakhsh et al, 2022), building materials such as gypsum (Kamarou et al, 2020;, binders (Kamarou et al, 2021b;2021c;Romanovski et al, 2021b), building blocks (Akinwande et al, 2022a;2022b;Ademati et al, 2022), composite materials (Akinwande et al, 2022c;Ogunsanya et al, 2022), as well as the modi cation of known methods through the use of waste, which can reduce energy costs for production (Smorokov et al, 2022;2023a;2023b). Materials obtained on the basis of gypsum binders are promising materials due to their operational properties, as well as low energy costs for their production.…”

Section: Introductionmentioning

confidence: 99%

High-strength gypsum binder with improved water-resistance coefficient derived from industrial wastes

Kamarou,

Moskovskikh,

Kuskov

et al. 2024

Waste Manag Res

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The article presents the possibility of increasing the water resistance of gypsum binders (GBs) obtained based on synthetic gypsum by introducing additives derived from industrial wastes. Regularities were obtained for the influence of the type and amount of additives on the water/gypsum ratio (W/G), strength indicators and water resistance of high-strength GB. The introduction of a single-component additive to improve water resistance does not have a significant effect. Complex additives based on Portland cement, granulated blast-furnace slag, electric steel-smelting slag, expanded clay dust and granite screenings of various fractions have been developed that make the maximum contribution to improving the water resistance of a high-strength GB based on synthetic calcium sulphate dihydrate, which made it possible to increase the water-resistance coefficient from 0.39 to 0.82.

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“…Extraction of valuable elements by hydrometallurgy has received widespread attention due to its low cost [ 4 , 5 , 6 ]. Recently, the extraction of Ti from TBFS by the sulfuric acid roasting method has received wide attention because of its energy saving, low cost, and high Ti recovery rate [ 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Co-Removal of Fe/V Impurity in H2TiO3 Synthesized from Ti-Bearing Blast Furnace Slag

Yang,

Peng,

Wang

et al. 2023

Nanomaterials

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Ti-bearing blast furnace slag (TBFS) can be converted to impurity bearing TiOSO4 solution for TiO2 pigment production. However, the H2TiO3 (MTA) hydrolyzed from the solution has too high Fe/V impurity to meet the standard for TiO2 pigment. In this study, we found that Fe3+ and V3+ were easily hydrolyzed and entered the MTA lattice, and hence could not be removed by washing. Furthermore, Fe/V was hard to co-remove by the traditional reduction method. Therefore, the Fe/V non-hydrolysis condition (Ti3+ = 0.01 M, F = 3.0, T = 130 °C; Ti3+ = 0.01 M, F = 3.5, T = 150 °C) was determined by thermodynamic calculations. However, at these conditions, the Ti hydrolysis ratio was low or the reaction time was long. Therefore, a new two-step hydrothermal hydrolysis process was proposed. Step 1 (130 °C, 2 h) ensured the non-hydrolysis of V3+, and Ti was partially hydrolyzed to increase the H2SO4 concentration. Step 2 (150 °C, 2 h) ensured a high Ti hydrolysis ratio (>0.95) and short total reaction time (4–6 h). Finally, a high-purity MTA was obtained (Fe = 21 ppm, V = 145 ppm). These results provide new insights into the control of the hydrolysis of impurity ions in solutions and help to optimize the process of TiO2 pigment preparation from TBFS.

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Low-temperature desiliconization of activated zircon concentrate by NH4HF2 solution

Cited by 12 publications

References 24 publications

Zircon processing in sodium carbonate melt

Zircon processing in sodium carbonate melt

High-strength gypsum binder with improved water-resistance coefficient derived from industrial wastes

Co-Removal of Fe/V Impurity in H2TiO3 Synthesized from Ti-Bearing Blast Furnace Slag

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