Soda ash roasting of titania slag product from Rosetta ilmenite

Lasheen, T.A.

doi:10.1016/j.hydromet.2008.02.020

Cited by 70 publications

(37 citation statements)

References 3 publications

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“…Ternary phases can be regarded as a result of partial substitution of titanium and/or iron by sodium ions in ilmenite lattice (Figure 3d). This was also found by Lasheen (2008) using soda ash. According to this author, sodium iron titanates are favoured at 850 ºC.…”

Section: Alkali Decomposition Reactionsupporting

confidence: 75%

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Titania recovery from low-grade titanoferrous minerals

2011

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In this study a novel process for extraction of titanium valuables from its minerals is presented. The process entails roasting of titanium ore with alkaline metal salt, hydrolysing fused cake and dissolution in acid. Optimum conditions were found to be 1 hr fusion at 850 °C, using 2:1 mole ratio, NaOH:FeTiO 4 , irrespective of the particle size interval used in this work. It was found that under these conditions » 80% of titanium was recovered. Na 0.75 Fe 0.75 Ti 0.25 O 2 , NaFeTiO 4 and Na 2 Fe 2 Ti 3 O 10 were the dominant phases at this temperature. The presence of these phases is viewed as beneficial to the economics of the process, it consumes less NaOH. Fusions conducted at 550 °C or below produced chiefly binary phases, Na 2 TiO 3 and NaFeO 4 , reducing process economy. Optimum leaching conditions were S/L= 0.26, leaching at 75 ºC, for 15 min. 85% of NaOH were recovered, under these conditions. Leaching obeys shrinking core mechanism model. IntroductionTitania (TiO 2 ) is a white pigment used in paints, paper, plastics, cosmetics and coatings. Its wide application is due to its higher opacity and covering power. There are two commercial methods of TiO 2 production, the chloride and the sulphate process. In the chloride process titanium mineral is converted into TiCl 4 which is subsequently oxidized at high temperatures.In the sulphate process the ore is converted into sulphate solution and then thermally hydrolysed to hydrous titanium. The later is calcined to produce the pigment (Braun et al, 1992;Nielsen and Chang, 1996;Xue et al, 2009).According to Pong et al (1995) a commercially viable process has to be environmentally benign, to generate a minimum waste, be able to use all grades of ores and be economically favourable. The above processes are, either environmentally unfriendly, costly, generate high levels of waste or recycle, are unable to process low grade ores, as well as, ores such as anatase, sphene, and perovskite (Bulatovic, 1999;Cole, 2001;Nielsen and Chang, 1996;Van Dyk et al, 2004;Yuan et al, 2005).Generally low grade titanoferrous ores are submitted to slagging process. The slagging process however faces uncertain future due to its higher energy consumption and green house gases emission. Additionally slagging is unable to treat radioactive ores, since the radionuclides remain in the solid solution during slagging process. With increasingly restringent environmental policies on radionuclides content, further treatment has to be conducted to reduce it. This will result in additional production costs (Nielsen and Chang, 1996; Habashi, 1997;Doan, 2003; Jha et al, 2005;Lahiri et al, 2006;Lahiri and Jha, 2007

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Section: Alkali Decomposition Reactionsupporting

confidence: 75%

“…Around 96% are recovered when six mole of NaOH are used per mole of FeTiO 3 . A temperature of 850 ºC was used in an attempt to produce ternary phases, sodium iron titanates, especially when fusing below 2:1 mol ratio (Lasheen, 2008). This was also confirmed in this work (Figure 2).…”

Section: Effect Of Particle Sizesupporting

confidence: 73%

Titania recovery from low-grade titanoferrous minerals

2011

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“…However, the conventional beneficiation methods currently face great difficulties in recovering titanium from the slag due to the complicated mineralogy and very fine mineral dissemination of the titanium mineral phases. 5) So far, many technical routes have been proposed across the world for titanium separation and comprehensive utilization of the titanium bearing slag, including the acid leaching process, 6) the alkaline leaching process 7) and the high temperature carbonization process. Based on the precipitation experiment results of titanium bearing molten slag during cooling liquation, perovskite (CaTiO 3 ) was the first precipitated phase, and 1 593-1 563 K was the advantageous precipitation temperature of perovskite from the molten simulated slag with a basicity of 1.30.…”

Section: Introductionmentioning

confidence: 99%

Selective Separation of Perovskite (CaTiO<sub>3</sub>) from Titanium Bearing Slag Melt by Super Gravity

2016

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“…However, this method requires high concentration of acid. This method has been used by several researchers, such as in [5]. Lasheen [5] aims to optimize titania extraction from slag with caustic method.…”

Section: Introductionmentioning

confidence: 99%

“…This method has been used by several researchers, such as in [5]. Lasheen [5] aims to optimize titania extraction from slag with caustic method. 325 mesh slag is reacted with soda with temperature variation of 400 to 1000…”

Section: Introductionmentioning

confidence: 99%

The Effect of Roasting Temperature at 400C and Sulphuric Acid Concentration on TiO2 Extraction Process from Zircon Sand Ilmenite

Setyani

Rahman

Nugroho

et al. 2014

JFA

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In this research, roasting temperature at 400• C and sulphuric acid concentration variations was conducted to obtain titanium dioxide from zircon sand. The research was done through extraction metallurgy method which involved physical, chemical, and mechanical treatments. Zircon was magnetically separated, mixed with NaOH, and roasted with temperature of 400• C. Characterization with XRD of the sample before and after magnetic separation was conducted. Peaks obtained from NaFeO2, NaTiO2, Na0.75Fe0.75Ti0.25O2, and TiO2 compounds were observed. In this study, the leaching process lasted in two stages. For the first leaching samples of combustion products are leached using distilled water to remove water-soluble impurities. For the second stage, the deposition obtained from stage one is leached using 8, 10, and 12 M concentrated sulphuric acid at high temperature to dissolve iron. XRD was used to characterize TiO2. The result showed that the sample at temperature of 400• C and concentrated sulphuric acid of 12 M is whiter in colour compared to other samples. Furthermore, at temperature 400• C and concentrated sulphuric acid of 12 M, the titanium dioxide produced is 32.3% and 11.5% for rutile and anatase, respectively.

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Soda ash roasting of titania slag product from Rosetta ilmenite

Cited by 70 publications

References 3 publications

Titania recovery from low-grade titanoferrous minerals

Titania recovery from low-grade titanoferrous minerals

Selective Separation of Perovskite (CaTiO<sub>3</sub>) from Titanium Bearing Slag Melt by Super Gravity

The Effect of Roasting Temperature at 400C and Sulphuric Acid Concentration on TiO2 Extraction Process from Zircon Sand Ilmenite

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