Dissolution Mechanism of Fluorine in Aqueous Solution from Fluorine Containing Synthetic Slag

Mizukami, Hideo; Ishikawa, Minoru; Hirata, Takeyuki; Kamiyama, Takanori; Ichikawa, Kenji

doi:10.2355/isijinternational.44.623

Cited by 23 publications

(20 citation statements)

References 4 publications

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“…24,25) The reason is thought to be that the silicate structure in the amorphous phase collapsed easily during acid leaching, but crystalline phase had better chemical stability. 24) Therefore, in the present study, the different dissolution behavior of matrix phase is attributed to the crystalline state of the matrix phase.…”

Section: Effect Of Cooling Ratementioning

confidence: 99%

Effects of Cooling Rate and Acid on Extracting Soluble Phosphorus from Slag with High P2O5 Content by Selective Leaching

Gao

Ueda

et al. 2017

ISIJ Int.

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With the use of low-grade iron ores with high P content, slag with high P 2 O 5 content generated after dephosphorization is considered a great potential source of P. Because of the solubility difference between the solid solution and matrix phase, it is possible to extract the P-rich solid solution selectively from slag by leaching. The soluble P obtained is suitable to produce phosphate fertilizers. To achieve selective leaching of P and increase its dissolution ratio, the effects of the cooling rate and acid on dissolution of the slag in aqueous solutions at pH 5 and 7 were investigated. This study found that during solidification, slow cooling facilitates coarsening of the solid solution and formation of the magnesioferrite phase. The solid solution was dissolved preferentially. At pH 7, the air-cooled slag showed the highest dissolution ratio of P. When the pH was decreased to 5, slag dissolution was significantly promoted. As the cooling rate decreased, the dissolution ratio of P increased. Slow cooling not only enhanced dissolution of the solid solution but also suppressed dissolution of the matrix phase. Citric acid performed better in promoting dissolution of slag. At pH 5, almost all of the solid solution was dissolved from the furnace-cooled slag. However, the dissolution ratio of Fe was also high. When nitric acid was used, 66.8% of the solid solution was dissolved, without dissolution of large amounts of the matrix phase. After leaching, the P 2 O 5 content in the residue reduced and the Fe 2 O 3 content increased.

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Section: Effect Of Cooling Ratementioning

confidence: 99%

Effects of Cooling Rate and Acid on Extracting Soluble Phosphorus from Slag with High P2O5 Content by Selective Leaching

Gao

Ueda

et al. 2017

ISIJ Int.

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“…The experiments of immobilization of fluorine dissolved from slag using the synthetic slag were done using the same method reported previously 6) to eliminate the factors such as slag composition and cooling rate during solidification, and the mechanism of immobilization of fluorine was examined.…”

Section: Samplementioning

confidence: 99%

“…As the dissolution of fluorine from slag depended on the distribution of particle size, that is, specific surface area of slag, 6) the distribution of slag particle size was fixed to that of plant slag which was crushed by using the jaw crusher. After crushing, the slag was riddled by sieves machine for twenty minutes using six kinds of sieves with opening screen from 0.1 to 2.0 mm, and the distribution of particle size of slag was controlled by mixing these riddled slags.…”

Section: Samplementioning

confidence: 99%

Immobilization Mechanism of Fluorine in Aqueous Solution from Road Material Containing Synthetic Hot Metal Pretreatment Slag by Shaking Test

Mizukami¹,

Ishikawa²,

Hirata

et al. 2004

ISIJ International

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“…In order to minimize the elution of F from slag to the environment, it is very important to investigate and control the contents of F compounds in slag. 1,2 Various analytical methods have been studied to identify F compounds. Surface analysis methods, for example X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and electron probe micro analyzer (EPMA), [3][4][5][6] were known to be effective tools for analyzing F; however, specific chemical information concerning slag could not be obtained.…”

Section: Introductionmentioning

confidence: 99%

“…However, pyrohydrolysis separation combined with ion chromatography, 11 is one of the analytical methods for thermally decomposing all F compounds in slag by elevating the temperature up to 1100 C in the presence of water, and comparable to the conventional method of sample decomposition-distillation separationlanthanum/alizarin complexone spectrometry. In this case, it is assumed that F in the F compounds reacts with H2O to become HF, as shown in the reaction (1).…”

Section: Introductionmentioning

confidence: 99%

Determination of Fluorine Chemical Structure in Slag by Thermal Hydrolysis He-MIP-OES

et al. 2018

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A novel microwave-induced helium plasma optical emission spectrometry (He-MIP-OES) combined with a thermal hydrolysis sample introduction system was newly established for the determination of fluorine (F) compounds in slags. The MIP maintained through an Okamoto cavity was adopted, which was quite stable and provided a higher detection capability of F by helium plasma. The basic analytical performance of He-MIP-OES combined with an ultrasonic nebulizer for F analysis was also examined, and expected results could be obtained. The thermal hydrolysis behavior of CaF2, Ca4(Si2O7)(F,OH)2 and Ca5(PO4)3F, as known F chemical structures in slag, was also examined by thermal hydrolysis He-MIP-OES; F compounds in actual slag could be successfully identified and determined by this developed system.

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Dissolution Mechanism of Fluorine in Aqueous Solution from Fluorine Containing Synthetic Slag

Cited by 23 publications

References 4 publications

Effects of Cooling Rate and Acid on Extracting Soluble Phosphorus from Slag with High P<sub>2</sub>O<sub>5</sub> Content by Selective Leaching

Effects of Cooling Rate and Acid on Extracting Soluble Phosphorus from Slag with High P<sub>2</sub>O<sub>5</sub> Content by Selective Leaching

Immobilization Mechanism of Fluorine in Aqueous Solution from Road Material Containing Synthetic Hot Metal Pretreatment Slag by Shaking Test

Determination of Fluorine Chemical Structure in Slag by Thermal Hydrolysis He-MIP-OES

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