Study on the Elution of Alkalinity From Steel-Making Slag Piled in Seawater

Kanayama, Susumu; Sakanakura, Hirofumi; Mizutani, Satoshi; Kato, Yoshiei; Takahashi, Katsunori; Kiso, Eiji; Hirai, Norio; Miyazaki, Satoshi

doi:10.2208/jscejoe.70.i_1152

Cited by 3 publications

(1 citation statement)

References 1 publication

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“…affect the alkali elution behavior. Kanayama et al 17) also built an analytical model on the alkali elution through slag layer. However, it might be difficult for the above batchtype column test to predict the alkali elution behavior in the real continuous flow of the ocean.…”

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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Alkaline Elution Behavior of Steelmaking Slag in Ocean Construction Area and Its Calculation Simulation

Takahashi¹,

Kanayama²,

Sakanakura³

et al. 2015

J. JSCE Ser. B3

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Long-term Alkali Elution Behavior from Steelmaking Slag into Seawater by an Open Channel Vessel

et al. 2019

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Steelmaking slag has been used in the coastal area for the purpose of the environmental improvement. Short-term alkali elution behavior induced by free CaO in the steelmaking slag was investigated by a batch and continuous vessel. In this study, long-term alkali elution experiments were done in an open channel vessel with a slag box to make clear the decreasing mechanism of the alkali elution from steelmaking slag into seawater. The experimental period was 44 d (1056 h). The pH values increased just in the beginning of the experiment, and then gradually decreased in about 100 min. They showed almost the same value as that of seawater in 1200 min. As the experimental time passed, the white deposits on the steelmaking slag layer, which were composed of Mg[OH] 2 and CaCO 3 , spread to the lower slag zone in the slag box. The white deposit zone of larger slag size was more rapidly diffused downward than that of smaller one due to larger voidage in the slag layer. While carrying out the batch test with the used slag by the long-term experiment, the alkali elution rate of slag layer on the open channel flow was 0.03-0.11 times decreased compared with the unused slag, whereas that of the lower positioned slag layer was 0.10-0.38 times decreased. From these results, it was found that the alkali elution rate was reduced by the white deposit on the steelmaking slag.

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Study on the Elution of Alkalinity From Steel-Making Slag Piled in Seawater

Cited by 3 publications

References 1 publication

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

Alkaline Elution Behavior of Steelmaking Slag in Ocean Construction Area and Its Calculation Simulation

Long-term Alkali Elution Behavior from Steelmaking Slag into Seawater by an Open Channel Vessel

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