Dissolution Behavior of Silicic Acid from Steelmaking Slag to Seawater

Tanaka, Miho; Hirata, Junichi; Nakamoto, Daisuke; Terada, Itsumi; Ryumae, Io; Takahashi, Mariko; Oikawa, Tomohiro; Takahashi, Kazuya; Aimoto, Michihiro

doi:10.2355/tetsutohagane.100.919

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…The concentration of silicic acid extracted from carbonized slag was higher than that of non-carbonized slag. in two silicic acid solutions the peak intensity ratio of was also basically the same [39]. Therefore, studies believe that carbonized slag was more suitable as a supplier of silica in seawater than non-carbonized slag.…”

Section: Dissolution Of Silicate In Steel Slagmentioning

confidence: 72%

A Review on the Effect from Steel Slag on the Growth of Microalgae

Liu

Cai

et al. 2021

Processes

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As a by-product from the metallurgical industry, steel slag contains a large amount of metal elements. In many developing countries, the output of steel slag is huge and the comprehensive utilization rate is low, hence the development of a novel application method for steel slag is of great significance to increase its utilization rate to improve the environment. This paper reviewed the dissolution behavior of Fe, P, Ca and silicate of steel slag under seawater and acidic solutions as an application in the cultivation of different microalgae, such as diatoms, spirulina, and chlorella. This review clarifies that proper pre-treatment of steel slag can effectively increase the dissolved elements of steel slag in the solution and provide more nutrients for the growth of microalgae. Microalgae cultivated with steel slag as a nutrient can be used to produce biodiesel which has a very broad application prospects for cleaner production and environmental protection.

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Section: Dissolution Of Silicate In Steel Slagmentioning

confidence: 72%

A Review on the Effect from Steel Slag on the Growth of Microalgae

Liu

Cai

et al. 2021

Processes

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“…Table 1 shows the slag features used for the experiment. As Slag I and III had smaller mean diameter than Slag II and IV, Al2O3 balls (density: 3.6×10 3 <d> = {6w/(ρπN)} 1/3 (1)…”

Section: Slag Samplesmentioning

confidence: 99%

“…Steelmaking slag has been utilized in ocean area as sea-grass beds due to its rich source of minerals such as iron oxide and silicon oxide [1][2][3][4][5][6][7][8][9][10][11], a usable material to prevent seawater contamination caused by sulfide contained in the bottom soil matter of the sea [12][13][14][15], and materials to increase soil strength by mixing with dredged soil or bottom materials of the sea [16,17]. However, a part of CaO in steelmaking slag exists as isolated free CaO and is decomposed into Ca 2+ and OHions in seawater.…”

Section: Introductionmentioning

confidence: 99%

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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