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Kanayama, Susumu; Sohma, Akio; Tanaka, Yuichi; Tsujii, Masato; Kiso, Eiji; Nakagawa, Masao

doi:10.2208/prooe.24.333

Cited by 5 publications

(1 citation statement)

References 2 publications

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“…1) Kanayama et al 15) observed the white precipitate and turbidity due to Mg(OH) 2 formation after one to seventy two hours and showed that it was suppressed by the mixing of the steelmaking slag with the dredged soil. 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.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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Cited by 5 publications

References 2 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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