Alkali Elution Behavior of Steelmaking Slag into Seawater by Batch Test

Tamaki, Hironori; Uddin, Azhar; Kato, Yoshiei; Takahashi, Katsunori

doi:10.2355/tetsutohagane.99.676

Cited by 6 publications

(6 citation statements)

References 5 publications

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“…(11). Although the exponent of u was almost the same as the batch experiment 16) shown in Fig. 13, the k values were slightly higher at the same u value.…”

Section: Non-dimensional Correlation Equation Effect Ofmentioning

confidence: 76%

“…The values of ϕ, , respectively. The penetration ratio, P (%), 16) of water defined as P≡k/k True ( − ), is also shown in the right side of the vertical axis where k True denoted the average k at < d > ≧1.0 × 10 − 2 m. The broken line denoted P in the batch experiment. 16) The k or P value decreased at < d > ≦1.0 × 10 − 2 m as well as the batch experiment, although its decreasing rate was smaller.…”

Section: Effect Of Operational Factors On Alkali Elution Ratementioning

confidence: 99%

“…The penetration ratio, P (%), 16) of water defined as P≡k/k True ( − ), is also shown in the right side of the vertical axis where k True denoted the average k at < d > ≧1.0 × 10 − 2 m. The broken line denoted P in the batch experiment. 16) The k or P value decreased at < d > ≦1.0 × 10 − 2 m as well as the batch experiment, although its decreasing rate was smaller. The difference between the batch and this study resulted from the value, < d > =0.48 × 10 − 2 m, was obtained from half of d = 0.95 × 10 − 2 m, which was not measured precisely due to its fineness.…”

Section: Effect Of Operational Factors On Alkali Elution Ratementioning

confidence: 99%

“…7 According to Tamaki et al, 16) k and α obtained from buffer effect of pH by carbonic acid in the seawater are defined as Eqs. (8) and (9) …”

Section: (3)mentioning

confidence: 99%

“…However, the effects of slag nature and operating factors on the alkali elution behavior were not found out within one hour when the alkali dissolution might reach a peak. Tamaki et al 16) carried out the kinetic study on the alkali elution behavior for one hour and found that the several operational factors such as impeller rotation speed, diameter of slag piece, etc. affect the alkali elution behavior.…”

Section: Introductionmentioning

confidence: 99%

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Alkali Elution Behavior of Steelmaking Slag into Seawater by Continuous Stirred Tank Reactor

et al. 2015

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In order to understand the alkali elution behavior of steelmaking slag under continuous flow, a kinetic study was carried out by continuous stirred tank reactor (CSTR). Tap water and seawater were used for measurements of circumferential velocity and temporal change in pH, respectively. Liquid was fed into the vessel and flowed constantly during the impeller rotation operation in the vessel. The effect of the various operating factors such as vessel inner diameter, slag size, slag composition, ratio of liquid volume to mass of slag, seawater feed rate, impeller height from the slag, impeller rotation speed etc. were investigated.The circumferential velocity in the vessel was not affected by seawater feed rate but by the impeller rotation speed. The alkali elution rate increased with the increase in the circumferential velocity. The alkali elution rate was not influenced by the ratio of liquid volume to mass of slag and impeller height from the slag surface. The alkali elution rate decreased with the decrease in diameter of slag particle below 0.01 m due to the insufficient penetration of seawater between slag particles. The alkali elution rate increased with the increase in seawater feed rate at the same circumferential velocity. The non-dimensional correlation equation of alkali elution rate was shown by Sh = 8.26 × 10 − 4 Re p 0.62 (Nτ) − 0.37 where Sh: Sherwood number, Re p : Particle Reynolds number and (Nτ): the product of impeller rotation speed and residence time.

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“…(11). Although the exponent of u was almost the same as the batch experiment 16) shown in Fig. 13, the k values were slightly higher at the same u value.…”

Section: Non-dimensional Correlation Equation Effect Ofmentioning

confidence: 76%

Section: Effect Of Operational Factors On Alkali Elution Ratementioning

confidence: 99%

Section: Effect Of Operational Factors On Alkali Elution Ratementioning

confidence: 99%

“…7 According to Tamaki et al, 16) k and α obtained from buffer effect of pH by carbonic acid in the seawater are defined as Eqs. (8) and (9) …”

Section: (3)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Alkali Elution Behavior of Steelmaking Slag into Seawater by Continuous Stirred Tank Reactor

et al. 2015

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Mutual Effect of Steelmaking Slag Layer Depth and Diameter on Alkali Elution Rate in Open Channel Vessels with Straightened Seawater Flow

Takeuchi

Tamaki

Uddin

et al. 2016

J. Sustain. Metall.

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Alkali Elution Behavior of Steelmaking Slag Packed in an Open Channel Vessel in Seawater

Matsuda

Uddin

Kato

et al. 2020

J. Sustain. Metall.

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The alkali elution behavior of steelmaking slag in seawater was kinetically investigated and simulated under continuous flow in an open channel vessel with packed bed of steelmaking slag. Two types of steelmaking slags, viz. decarburization slag and dephosphorization slag, were used in this study. The alkali elution rate of decarburization slag was larger than that of dephosphorization slag due to larger free CaO content. The pH value for dephosphorization slag was almost the same as the seawater pH value in 3-4 days, whereas that for decarburization slag was stabilized in 3 days although the pH value was slightly larger than that of seawater. The capacity coefficients of alkali elution for dephosphorization and decarburization slags decreased together in an exponential manner with time. Based on a regression equation on the mass transfer capacity coefficient change with time, the alkali elution behavior was simulated and the calculated results agreed well with experimental ones. The temporal pH change was predicted by changing slag surface area and seawater flow rate as a parameter. According to the simulation results for dephosphorization slag, the seawater pH value did not reach a high level in the ocean area.

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Alkali Elution Behavior of Steelmaking Slag into Seawater by Batch Test

Cited by 6 publications

References 5 publications

Alkali Elution Behavior of Steelmaking Slag into Seawater by Continuous Stirred Tank Reactor

Alkali Elution Behavior of Steelmaking Slag into Seawater by Continuous Stirred Tank Reactor

Mutual Effect of Steelmaking Slag Layer Depth and Diameter on Alkali Elution Rate in Open Channel Vessels with Straightened Seawater Flow

Alkali Elution Behavior of Steelmaking Slag Packed in an Open Channel Vessel in Seawater

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