Synthesizing alkali ferrates using a waste as a raw material

Kanari, Ndue; Ostrosi, Etleva; Ninane, L.; Neveux, N.; Evrard, O.

doi:10.1007/s11837-005-0166-2

Cited by 17 publications

(15 citation statements)

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“…Several investigations previously conducted in our laboratory were focused on the use of industrial iron sulfate for the synthesis of alkali ferrates [3,5,6]. The potassium ferrate synthesis (K 2 FeO 4 ) from spent steel pickling liquid was also reported by Wei et al [7].…”

Section: Methodsmentioning

confidence: 88%

“…Additional steps (see Figure 1) are necessary to obtain the TiO 2 base pigment. Depending on the quality of the raw materials used in the TiO 2 production, the amount of iron sulfate produced can reach up to 6 tons Several investigations previously conducted in our laboratory were focused on the use of industrial iron sulfate for the synthesis of alkali ferrates [3,5,6]. The potassium ferrate synthesis (K2FeO4) from spent steel pickling liquid was also reported by Wei et al [7].…”

Section: Introductionmentioning

confidence: 84%

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Thermal Behavior of Hydrated Iron Sulfate in Various Atmospheres

Kanari

Ménad

Ostrosi

et al. 2018

Metals

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Iron sulfate, in particular FeSO4·7H2O, is derived from titanium dioxide production and the steel pickling process. Regarding TiO2 manufacturing, the amount of the resultant FeSO4·7H2O can be as high as 6 tons per ton of produced TiO2, leading to a huge amount of ferrous sulfate heptahydrate, which is considered an environmental and economic concern for the titanium dioxide industry in European countries. The present paper focuses on the thermal treatment of ferrous sulfate (heptahydrate and monohydrate) samples under different conditions. Nonisothermal thermogravimetric (TG) analysis was used to study the behavior of iron sulfate samples at temperatures of up to 1000 °C in Cl2 + O2, O2, and N2 atmospheres. Results showed that the dehydration of iron sulfate heptahydrate in nitrogen started at room temperature and resulted in iron sulfate tetrahydrate (FeSO4·4H2O). The ferrous sulfate monohydrate (FeSO4·H2O) was formed at temperatures close to 150 °C, while the anhydrous ferrous sulfate (FeSO4) was obtained when the samples were heated in nitrogen at over 225 °C. The kinetic features of FeSO4 decomposition into Fe2O3 were revealed under isothermal conditions at temperatures ranging from 500 to 575 °C. The decomposition of iron sulfate was characterized by an apparent activation energy of around 250 kJ/mol, indicating a significant temperature effect on the decomposition process. The obtained powder iron oxide could be directed to the agglomeration unit of iron and the steelmaking process.

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Section: Methodsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 84%

Thermal Behavior of Hydrated Iron Sulfate in Various Atmospheres

Kanari

Ménad

Ostrosi

et al. 2018

Metals

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“…Solid sodium ferrate(VI) was prepared using caustic soda and sodium hypochlorite (or chlorine gas) instead of potassium hydroxide and calcium hypochlorite, the preparation cost was then reduced. The ferrate(VI) produced by this technology is reported to be cheaper 11 since the ferrous sulphate used was generated from titanium dioxide production, which is a waste material and its disposal is restricted by environmental regulations. The recycling of ferrous iron by the synthesis of potassium ferrate(VI) reduced the production cost.…”

Section: Dry Oxidation Methodsmentioning

confidence: 99%

Advances in the development and application of ferrate(VI) for water and wastewater treatment

Jiang

2013

J of Chemical Tech & Biotech

144

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Ferrate(VI) ion has the formula FeO 4 2− , and possesses unique properties, vs. strong oxidising potential and simultaneous generation of ferric coagulating species. For this reason, a number of studies have been carried out to investigate the preparation, characterisation and application of ferrate(VI) for water and wastewater treatment. These studies revealed that ferrate(VI) can disinfect microorganisms, partially degrade and/or oxidise organic and inorganic impurities, and remove suspended/colloidal particulate materials in a single dosing and mixing unit process. Most recently, research groups globally have reported using ferrate(VI) to treat emerging micropollutants in water purification processes. Work has not only been limited to fundamental studies but has been driven by the ideas of putting the application of ferrate(VI) into practice; the advantages of the application of ferrate(VI) over existing water and wastewater treatment methods should be shown as should other benefits to the water industry of its use. This paper thus reviews advances in the preparation and use of ferrate(VI), discusses the potential full scale application of ferrate(VI) in water purification and recommends required future research in order to implement ferrate(VI) in practice.

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“…Ilmenite and titanium slag are used for TiO 2 production using the "sulfate" process. Equations (2) and (3) represent the principal reactions occurring during the treatment of ilmenite to produce TiO 2 in using the sulfate route. Thus, ilmenite is reacting with sulfuric acid generating a solution containing titanyl sulfate and iron sulfate.…”

Section: Methodsmentioning

confidence: 99%

“…The major environmental disadvantage of the sulfate process is the large quantities of spent acid and ferrous sulfate generated. The amount of iron sulfate produced depends on the quality of the raw materials used for the titanium dioxide production and can reach up to 6 tons of FeSO The main apparatus and experimental procedure for the ferrate synthesis were described previously [2]. The solid sample (FeSO 4 .…”

Section: Methodsmentioning

confidence: 99%