A study of the solubility of pure slag minerals

Engström, Fredrik; Adolfsson, Daniel; Samuelsson, Caisa; Sandström, Åke; Björkman, Bo

doi:10.1016/j.mineng.2012.10.004

Cited by 86 publications

(41 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

“…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%

“…Depending on which elements the spinels consist of they can either stable or unstable Spinels become more soluble as the calcium content increases . The dissolution of merwinite has been studied by Engström et al, who showed that merwinite is soluble, especially in acidic and neutral pH. Only two phases are left to be investigated; magnesiowüstite and brownmillerite.…”

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.

View full text Add to dashboard Cite

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.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Strandkvist

Sandström

Engström

2017

steel research int.

View full text Add to dashboard Cite

show abstract

“…(2). Although there is almost no research on the dissolution rate of melilite in alkaline solutions, Engstrom et al 20) measured the dissolution amounts of each mineral as slag components in aqueous solutions (pH = 4, 7, 10) continuously using granular reagents of 20-38 μm in diameter by automatic titration. Using the data obtained from a dissolution experiment of gehlenite in a NaOH aqueous solution of pH = 10 at 25°C, the dissolution rate (flux) of Al(OH) 4 − J dissol.…”

Section: Determining the Mechanism Of Ettringite Formationmentioning

confidence: 99%

The Conditions of Ettringite Formation by the Reaction of a Blast Furnace Slag with Aqueous Alkaline Solutions

Harashima

Ito

2016

ISIJ Int.

View full text Add to dashboard Cite

“…The relative concentrations of these phases depend on slag compositions and cooling condition . The leaching behaviors of various phases are quite different . It was well accepted that spinel phase is very stable in air and leaching of Cr from spinel phase is negligible .…”

Section: Introductionmentioning

confidence: 99%

Effects of MnO and CaO/SiO₂Mass Ratio on Phase Formations of CaOAl₂O₃MgOSiO₂CrO_xSlag at 1673 K and PO2=10−10 atm

Shu

Luo

Wang

et al. 2015

steel research int.

View full text Add to dashboard Cite

The knowledge on distribution of mineralogical phase in slag is of vital importance to disposal and utilization of slag. Despite of certain amount (up to 5%) of MnO found in stainless steel slag, MnO distribution in phases of slag was not thoroughly investigated. In this work, phases of synthetic CaO–Al2O3–MgO–SiO2–CrOx–MnO slag with varied CaO/SiO2 and MnO content, which was soaked at 1673 K for 12 h, were determined by combining SEM‐EDS and XRD technique. Phases for samples with CaO/SiO2 ratio of 1.5 and 1.3 were composed of Ca2SiO4, merwinite, spinel, and liquid phase, while phases for samples with CaO/SiO2 ratio of 1.1 are composed of spinel and liquid phase. The calculated phases by FactSage were in good agreements with observed ones by SEM‐EDS and XRD. Manganese was found to be enriched in spinel and liquid, and chromium is enriched in spinel, and only negligible Cr could be found in merwinite and Ca2SiO4. The spinel increases in size with increasing of MnO and decreasing of CaO/SiO2 ratio. Disintegration was found in samples with increased MnO content and CaO/SiO2 ratio. The size of Ca2SiO4 crystal increases in size with increase of MnO content and CaO/SiO2 ratio, which could interpret the disintegration of slag. The present investigation indicates that MnO content has important effects on disintegration and spinel precipitation in stainless steel slag.

show abstract

A study of the solubility of pure slag minerals

Cited by 86 publications

References 18 publications

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

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

The Conditions of Ettringite Formation by the Reaction of a Blast Furnace Slag with Aqueous Alkaline Solutions

Effects of MnO and CaO/SiO₂Mass Ratio on Phase Formations of CaOAl₂O₃MgOSiO₂CrO_xSlag at 1673 K and PO2=10−10 atm

Contact Info

Product

Resources

About

A study of the solubility of pure slag minerals

Cited by 86 publications

References 18 publications

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

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

The Conditions of Ettringite Formation by the Reaction of a Blast Furnace Slag with Aqueous Alkaline Solutions

Effects of MnO and CaO/SiO2Mass Ratio on Phase Formations of CaOAl2O3MgOSiO2CrOxSlag at 1673 K and PO2=10−10 atm

Contact Info

Product

Resources

About

Effects of MnO and CaO/SiO₂Mass Ratio on Phase Formations of CaOAl₂O₃MgOSiO₂CrO_xSlag at 1673 K and PO2=10−10 atm