Comparative study on different steel slags as neutralising agent in bioleaching

Gahan, Chandra Sekhar; Cunha, Maria Lucelinda; Sandström, Åke

doi:10.1016/j.hydromet.2008.05.042

Cited by 57 publications

(24 citation statements)

References 13 publications

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“…Concentrations were then measured using inductively coupled plasma optical emission spectrometry or mass spectrometry (Table 2). The values of pH in H 2 O, loss‐on‐ignition at 550°C, C content, and major and trace element contents all lie within the typical ranges for this kind of material (Gries and Chevalier, 2006; Gahan et al, 2009; Proctor et al, 2000; Presslinger et al, 1999). The slag was characterized by high Ca, Fe, and Si contents.…”

Section: Methodssupporting

confidence: 61%

See 1 more Smart Citation

Hydrodynamic Characterization of Basic Oxygen Furnace Slag through an Adapted BEST Method

Yılmaz¹,

Lassabatère²,

Angulo-Jaramillo

et al. 2010

Vadose Zone Journal

103

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Newer urban soils, frequently composed of several types of anthropogenic materials, may contain basic oxygen furnace (BOF) slag, which is a steel industry byproduct and considered a potential alternative material for road construction. An understanding of the flow and solute transfer processes through urban soils thus requires hydraulic characterization of these materials. The BEST (Beerkan Estimation of Soil Transfer Parameters) algorithm serves to estimate the full set of unsaturated soil properties by means of conducting an inverse analysis of Beerkan water infiltration data. This study aimed at characterizing unsaturated hydraulic properties of the BOF slag and its evolution during a 1‐yr period through water infiltration experiments and use of an adapted BEST method for inverse analysis. Results indicate the evolution with time of BOF slag hydraulic parameters due to their physicochemical changes when exposed to rainfall events. Moreover, the findings of this study highlight the initial spatial variability of hydrodynamic characteristics, which after a certain period shifts to mostly homogeneous behavior. This study has contributed to the hydrodynamic characterization of BOF slag by providing hydraulic conductivity and water retention curves, as required for modeling water and thus solute transfer processes vs. time, which is relevant to BOF slag reuse and environmental considerations.

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Section: Methodssupporting

confidence: 61%

“…Chemical analysis of basic oxygen furnace steel slag frac ons. typical ranges for this kind of material (Gries and Chevalier, 2006;Gahan et al, 2009;Proctor et al, 2000;Presslinger et al, 1999). .…”

Section: Methodsmentioning

confidence: 99%

Hydrodynamic Characterization of Basic Oxygen Furnace Slag through an Adapted BEST Method

Yılmaz¹,

Lassabatère²,

Angulo-Jaramillo

et al. 2010

Vadose Zone Journal

103

View full text Add to dashboard Cite

show abstract

“…So the properties (e.g., mechanical properties and durability) of cement concrete and asphalt concrete can be improved by using steel slag as aggregates [8][9][10][11]. A small amount of steel slag is used as raw material in brick production [12], to remove impurity agent [13,14] and neutralizing agent [15].…”

Section: Introductionmentioning

confidence: 99%

The influence of steel slag on the hydration of cement during the hydration process of complex binder

Wang

Yan

Han

2011

Sci. China Technol. Sci.

114

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The influence of steel slag, a by-product from the processing of iron to steel, on the hydration of cement during the hydration process of complex binder was studied by calorimetry, X-ray diffraction analysis, and Ca(OH) 2 content determination. The results show that steel slag and cement affect each other's hydration by changing the hydration environment. Steel slag does not react with the hydration products of cement. The dormant period of cement-steel slag complex binder during the hydration is longer than that of cement. The more the adding amount of steel slag is, the longer the dormant period of complex binder will be. The steel slag decreases the early hydration rate of cement. This phenomenon is more obvious with the increment of steel slag addition. However, the steel slag can promote the hydration degree of cement at later ages and the promoting effect becomes more obvious with the increment of steel slag addition and the hydration ages. steel slag, cement, complex binder, hydration Citation:Wang Q, Yan P Y, Han S. The influence of steel slag on the hydration of cement during the hydration process of complex binder.

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“…Kruse et al [20] reported mixed success based on field-and laboratory-based studies using steel slag to treat AMD in Ohio, USA. Others reported success and failure with iron and steel slag for treating AMD for static and kinetic laboratory-based studies [19,22]. Armoring of slag used in treatment systems (e.g., Equation (5)), hydraulic clogging, and loss of NP are all reported problems that may need engineering and chemical solutions to improve effectiveness and longevity of AMD treatment systems [7,21,36].…”

Section: Acid Neutralizatino and Potential For Application In Water Tmentioning

confidence: 99%

“…Numerous studies have documented the effectiveness of using steelmaking slag to remove phosphorus (P) from wastewaters and agricultural runoff [3][4][5][6][7][8][9][10][11][12][13][14][15]. Ferrous slag has also been shown to be an effective acid-neutralizing agent with applications in the treatment of acid-mine drainage from coal and base-metal operations [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Geochemical Characterization of Iron and Steel Slag and Its Potential to Remove Phosphate and Neutralize Acid

et al. 2019

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Iron and steel slags from legacy and modern operations in the Chicago-Gary area of Illinois and Indiana, USA, are predominantly composed of Ca (10–44 wt. % CaO), Fe (0.3–28 wt. % FeO), and Si (10–44 wt. % SiO2), with generally lesser amounts of Al (<1–15 wt. % Al2O3), Mg (2–11 wt. % MgO), and Mn (0.3–9 wt. % MnO). Mineralogy is dominated by Ca ± Mg ± Al silicates, Fe ± Ca oxides, Ca-carbonates, and high-temperature SiO2 phases. Chromium and Mn concentrations in most samples may be environmentally significant based on comparison with generic soil contaminant guidelines. However, simulated weathering tests suggest these elements are present in generally insoluble phases making their use in water treatment applications possible; however, the generation of high pH and alkaline solutions may be an issue. As for possible water treatment applications, batch and flow-through experiments document effective removal of phosphate from synthetic solutions for nearly all slag samples. Air-cooled fine fractions (<10 mm) of modern slag were most effective; other types, including modern granulated, modern air-cooled coarse fractions (>10 mm), and legacy slag removed phosphate, but to a lesser degree. An additional water treatment application is the use of slag to neutralize acidic waters. Most slag samples are extremely alkaline and have high net neutralization potentials (NNP) (400–830 kg CaCO3/t), with the highest approximately equivalent to 80% of the neutralization potential of calcite. Overall, phosphate removal capacity and NNP correlate positively with total Ca content and the dissolution of Ca minerals facilitates secondary Ca phosphate formation and consumes acid during hydrolysis. Utilizing locally available slag to treat waste or agricultural waters in this region may be a higher value alternative than use in construction, potentially offsetting restoration costs to degraded legacy areas and decreasing steel manufacturers’ current waste footprint.

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Comparative study on different steel slags as neutralising agent in bioleaching

Cited by 57 publications

References 13 publications

Hydrodynamic Characterization of Basic Oxygen Furnace Slag through an Adapted BEST Method

Hydrodynamic Characterization of Basic Oxygen Furnace Slag through an Adapted BEST Method

The influence of steel slag on the hydration of cement during the hydration process of complex binder

Geochemical Characterization of Iron and Steel Slag and Its Potential to Remove Phosphate and Neutralize Acid

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