Synthesis and dissolution of slag minerals - a study of β-dicalcium silicate, pseudowollastonite and monticellite

Strandkvist, Ida; Björkman, Bo; Engström, Fredrik

doi:10.1179/1879139515y.0000000022

Cited by 23 publications

(16 citation statements)

References 21 publications

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“…A specified size fraction was used to avoid the influence of varying particle size on reaction kinetics. The size fraction 20–38 μm was selected to match dissolution studies of other minerals . A beaker filled with 100 ml Milli‐Q ® water was placed in a water bath with constant temperature 298 K, on an immersed magnetic stirrer set to 320 rpm.…”

Section: Methodsmentioning

confidence: 99%

“…The size fraction 20-38 mm was selected to match dissolution studies of other minerals. [12,14] A beaker filled with 100 ml Milli-Q 1 water was placed in a water bath with constant temperature 298 K, on an immersed magnetic stirrer set to 320 rpm. A pH-electrode, nitrogen gas, and a Radiometer Copenhagen ABU 901 Autoburette attached to a Radiometer Copenhagen PHM 290 pH meter were connected into the beaker.…”

Section: Ph-dependent Dissolution Test and Leaching Testmentioning

confidence: 99%

“…Minerals have different dissolution rates. This results in some minerals, for example the dicalcium silicates the most soluble mineral, dissolving quickly, and raising the pH in the leachate . The higher pH may affect the slower dissolving minerals, as they now have different leaching conditions.…”

Section: Introductionmentioning

confidence: 99%

“…This results in some minerals, for example the dicalcium silicates the most soluble mineral, dissolving quickly, and raising the pH in the leachate. [12][13][14] The higher pH may affect the slower dissolving minerals, as they now have different leaching conditions. Thus, all minerals in slag should be studied and at different pH to really understand leaching.…”

Section: Introductionmentioning

confidence: 99%

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Effect of FeO/MgO Ratio on Dissolution and Leaching of Magnesiowüstite

Strandkvist

Sandström

Engström

2017

steel research int.

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If slag is to be used as construction material, the leaching of some elements, such as chromium must be limited. The leaching of slag depends on the leaching properties of the minerals in the slag. However, the leaching/dissolution properties of individual slag minerals are usually not studied. One common slag mineral that can contribute to the leaching of chromium is magnesiowüstite. The object of this study is to determine whether magnesiowüstite can be modified to avoid chromium leaching. Magnesiowüstite samples with different FeO/MgO ratios with and without chromium content are manufactured. The dissolution is evaluated at pH 7 and 10 using the magnesiowüstite samples without chromium, at size fraction 20–38 μm, by measuring the acid consumption required to maintain constant pH level. The magnesiowüstite samples with chromium content are leached at pH 10; the leachate is analyzed for chromium. The results are unanimous, with increasing FeO content the dissolution of magnesiowüstite and leaching of chromium decrease. At pH 10 the magnesiowüstite, with ≥60 wt% FeO show no sign of dissolution and no chromium leaching could be detected with ≥70 wt% FeO. The results prove that the FeO content can stabilize magnesiowüstite and, thereby, prevent chromium leaching.

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Section: Methodsmentioning

confidence: 99%

Section: Ph-dependent Dissolution Test and Leaching Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of FeO/MgO Ratio on Dissolution and Leaching of Magnesiowüstite

Strandkvist

Sandström

Engström

2017

steel research int.

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“…Tauchi et al 8) showed that the complete melting process by slag modification to decrease the basicity suppressed the Ca elution in aqueous solution for dephosphorization slag. Strandkvist et al 9) clarified that pure mineral phases like Ca 3 MgSi 2 O 8 , β-Ca 2 SiO 4 , γ-Ca 2 SiO 4 , Ca 2 MgSi 2 O 7 and α-CaSiO 3 were completely dissolved when the pH value of solution was controlled at 7, while the mineral phase CaMgSiO 4 showed better durability than the others. However, research on the Ca elution behavior of a single common mineral phase of steelmaking slag are limited.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Silicate Structure on Calcium Elution Behaviors of Calcium-silicate Based Mineral Phases in Aqueous Solution

et al. 2020

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Effect of B2O3 addition on mineralogical phases and leaching behavior of synthetic CaO–SiO2–MgO–Al2O3–CrOx slag

Lin

Luo

Yan

et al. 2020

J Mater Cycles Waste Manag

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Boron oxide is frequently applied in modification of stainless steelmaking slag to mitigate the disintegration of slag. In this work, the effect of B 2 O 3 on mineralogical phases and hexavalent chromium leaching behavior of synthetic CaO-SiO 2-MgO-Al 2 O 3-CrO x slag was investigated. Di-calcium silicate, merwinite, spinel, akermanite, and matrix phase were observed as main minerals in slags by scanning electron microscope (SEM) equipped with energy-dispersive spectrometry (EDS) and X-ray diffraction (XRD) techniques. It was found that 2% B 2 O 3 addition is sufficient to eliminate the disintegration of synthetic slag by suppressing the phase transition to γ-Ca 2 SiO 4. The size of spinel phase increases with increasing B 2 O 3 , which could be well interpreted by enhanced Ostwald ripening. The amount of Ca 2 SiO 4 phase in slag was reduced by addition of B 2 O 3 ; however, excess B 2 O 3 (> 2%) addition would significantly increase chromium concentration and overall chromium distribution in Ca 2 SiO 4 phase. Leaching results according to US-EPA-3060A method indicated that excess boron oxide addition (> 2%) leads to a significant increase of hexavalent chromium leaching concentrations and should be avoided for stabilizing stainless steel slag.

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Synthesis and dissolution of slag minerals - a study of β-dicalcium silicate, pseudowollastonite and monticellite

Cited by 23 publications

References 21 publications

Effect of FeO/MgO Ratio on Dissolution and Leaching of Magnesiowüstite

Effect of FeO/MgO Ratio on Dissolution and Leaching of Magnesiowüstite

Effect of the Silicate Structure on Calcium Elution Behaviors of Calcium-silicate Based Mineral Phases in Aqueous Solution

Effect of B2O3 addition on mineralogical phases and leaching behavior of synthetic CaO–SiO2–MgO–Al2O3–CrOx slag

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