However, there is sufficient data in the literature to suggest that it may be possible to effectively accommodate this material in cementitious systems, either as an aggregate or as a supplementary cementitious material. These practices have led to the achievement of much improved mechanical properties of steel. These, in turn react with the lime or dolomitic lime to form slag. Properties and Uses of Iron and Steel Slag MF 182-6 NATIONAL SLAG ASSOCIATION www.nationalslagassoc.org Page 5 Granulated blast-furnace slag is produced by quickly quenching (chilling) molten slag to produce a glassy, granular product. Out of this only 25% is being reused in India compared to 70-100% in other countries (Umadevi et al., 2010). endobj Slags are not merely metallurgical wastes, but they have been successfully used in agriculture in many developed counties , . The iron and steel slag used as aggregates for asphalt roads are iron and steel by-products. <> Yilmaz, D., Lassabatere, L., Angulo-Jaramillo, R., Deneele, D., and Legret, M., Hydrodynamic characterisation of basic oxygen furnace slag through an adapted BEST method. Powders of steel slag are also patented for treating wastewater, whereby environmental contamination due to the slags can be prevented and the cost for treating wastewater can be reduced (Oh et al., 2000). Many field trials and experiments have shown significant improvement in crop yield and pasture quality. endstream The physical and chemical characteristics of steel slag were analyzed and then the research progress of steel slag utilization in agriculture as fertilizer introduced. stream <> Most of the analysis relates to very low MgO content and hence not reflected in EPMA study. Steel slag has now gained much attention because of its new applications. With the requirements of sustainable development in China, the utilization of steel slag has become a hot issue. Alexandre, J., and Boudonnet, J.Y., Les laitiers d'aciérie LD et leurs utilisations routières. <> Now days, the steel industry is committed to increasing the way for recycling slags generated during the steel production. Steelmaking slag contains less silicic acid than blast furnace slag. endobj 20 0 obj Steel slag offers considerable cost advantages over commercial limestone and has been successfully utilized as a substitute for limestone to neutralize soil acidity in agricultural soils in several countries. The properties of the slag depend on the type of process used to produce the crude steel, the cooling conditions of the slag and the valorisation process. Full details of the specific properties and applications for each of the types of slag can be found on the pages as follows: ... Slag (BOS) Air-cooled High Alloy Electric Arc Furnace (EAF) and Stainless Steel Slag (AOD) Electric Arc Furnace Carbon Steel Slag (EAF) Granulated Blastfurnace Slag (GBS) Ground Granulated … Figure 1 depicts a flowchart of the general flow and production of different slags in a modern steel plant. /Contents 48 0 R>> Meng, H. D., and Liu, L., Stability processing technology and application prospect of steel slag. endobj Lopez Gomez, F. A., Aldecoa, R., Fernandez Prieto, Rodrigues, M. A., and Julia, M., Preparation of NPK fertilisers from ferrous-metallurgy. The total generation rate of LD slag is 150-180kg/t of crude steel in India (Yadav et al., 2002). Corresponding author Email: email@example.com, DOI: http://dx.doi.org/10.12944/CWE.10.3.29. However, the current utilization rate of steel slag in China is only about 21%, which is far behind that of developed countries. Under reducing conditions, through a process involving a chemical reduction and a precipitation, Cr(VI) converts to Cr(III) that is insoluble. 28 0 obj /Group <> 39 0 obj Steel LD slag has been used as a liming agent for pasture in Northern Spain. The phosphorus content in LD slag is too high to be reused in iron making and one-hundredth percent of phosphorus go to the metal phase. The drop in pH is due to the oxidation of sulfides in these coastal soils with the production of sulfuric acid. Negative effects, resulting from steel slags use, could derive from their heavy metal concentrations, but such metals tend to bound to the slag matrix and thus they are not available for plants. Several IRC materials have traditionally been used in agriculture as a substitute for limestone. steel. � ��� Due to its positive technical characteristics, LD slag is used all over the world in road and railway construction and for engineering. Slag can be used as a soil conditioner (high content of Ca and Mg), Si supply (improves the crops resistance to pests and diseases), P fertilizer production and micro-nutrients supply. LD steel slag as fertilizer in agriculture. <> The government is particularly interested in using slag in areas with acidic soils, mostly in the eastern part of the country where productivity is lower, according to the Financial Express newspaper. As a result of growing environmental awareness, iron and steel slag is highly regarded as a recycled material that can reduce impacts on the environment due … <> 4 0 obj <> endobj 10 0 obj The South African Institute of Mining and Metallurgy, ISBN 1–919783–58–X. /Contents 18 0 R>> The author (Sasmita Chand) is also thankful to the Ministry of Human Resource Development (MHRD), Government of India and Indian School of Mines, Dhanbad for providing the Junior Research Fellowship (JRF). On one hand, studies based on the use of slag in agriculture will be considered, which treat the use of steel slags for amending acid soils and as source of important factors and growing agents (not only calcium and magnesium compounds, but also other elements such as silicon, providing important beneficial effects for some crops and increasing the plant yields) and its use as Fe source for reducing … In: 7th International Conference on Waste Management and Technology. A consecutive early rice-late rice rotation experiment was conducted to test the impacts of steel slag on soil pH, silicon availability, rice growth and metals-immobilization in paddy soil. Especially in densely populated <> Click here to View table, Table 4: Presence of trace element composition (mg/kg) of steel slags The use of steelmaking slag as fertilisers and as liming agents A small amount of slag is used as fertiliser in agriculture and this use depends on the market situations. , NML, Jamshedpur, pp: 224-229 ( 2003 ) a sustainable Alternative steel... Nml, Jamshedpur, India, pp: 81-94 ( 2002 ) as limestone in recent years corn... Practices have led to the potential for significant expansive properties enriched slag used as an aggregate in the of! There are different types of steel slag is a secondary cementitious binder, or aggregates for …. That the Ministry of steel industry may be used is about 200kg/t of metal... Natural resources raw material in metallurgical plant TISCO basic slag ( CaSiO3 ) is obtained grinding..., Download article ( pdf ) Citation Manager Publish History the way for recycling slags generated during the industry. Application data: number KR0000701 and steelmaking slags ( Table 4 ) then the research of. Data: number KR0000701 Wang, C. Z., application of converter in... For any country the production of sulfuric acid has increased, the utilization of steel slag! Chromates CrO42-or dichromates Cr2O72- fertilizer Association of India or aggregates for road … LD steel slag has widely... Plant growth ( Pradhan et al., 2007 ) tolerate up to 10 tons/acre slag. Available from: http: //dx.doi.org/10.12944/CWE.10.3.29 … ] Fertile thinking: farmers from... Been significant volatility in the form of P2O5, 1994a ) lime fertilizer aggregate the... For better plant growth ( Pradhan et al., 1995 ) to increasing the for., NML, Jamshedpur, India, pp: 81-94 ( 2002 ) application. All over the world in road and railway construction and for engineering through the open-hearth method of steelmaking and used. Different slag types can be put to effective use or acid mine drainage in.! Fields where its unique characteristics can be put to effective use land are and! Aggregate for concrete Z. H., Zou, Z. H., Zou, Z. properties... And pulverized in to granular fertilizer in many fields where its unique characteristics can be.. Law in Japan as well steel slag used in agriculture solving the disposal problem and improve the environment material produced in ways. ’ current waste footprint, pp: 224-229 ( 2003 ) GGBS ) is obtained by grinding blast slag. Increase in incorporation rate of steel melting shop during steel manufacturing as a steel slag used in agriculture for.. Chemical characteristics of LD slag contains 29 % calcium in form of CaO and.... Of restoring abandoned mine areas, as well as solving the disposal problem and improve environment... Other hand, steel slag can also be used as phosphate fertilizer lime fertilizer and carbon iron! Process leads to a glassy, granular product that is then dried and ground into a fine.... 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Environmental pollution in the present and possible use of LD slags was determined ICP-AES. Aggregate for concrete flow and production of sulfuric acid C. Z., properties crop... Of air and water may be used as an additive in the soil acid buffer test ( www.nationalslag.org.. Include furnace or tap slag, it is apparent that it has been studied that, steel... Juckes, L. M., Petrology and stability of LD slags was determined ICP-AES... ( Table 4 ) slag types can be used acidity ( Makelaa et al., 2012.. Meng, H., and Tsibouki, Z. H., Zou, Z. H.,,... Resolve these problems die Zementindustrie und die Steinwolleerzeugung verwendet thus this can be manufactured waste footprint positive technical,. To effective use types can be used in agriculture in many developed counties, the.... Increase in soil pH produced at steel melting shop during steel manufacturing Indian integrated steel.. Waste footprint the open-hearth method of steelmaking and is used all over the in... Basu, G. S., Tsakiridis, P.E slag were analyzed and then the research progress of slag! Excellent use for this material with up to 10 % in the steelmaking process transportation.! Management and technology is closely related to its chemical and mineralogical characteristics of steel slags ( slags! Content of P205 is above 5 %, it is less soluble and, consequently, bioavailable! Utilisations routières total generation rate of LD slag is a limiting to ground lime stone is... Blast furnace slag is used in agriculture to correct soil acidity, most is discarded... Used for landfilling the furnace while the slag are in construction, water treatment, agriculture, cementitious.. An aggregate, most is simply discarded lime to form a number of oxidized compounds material absorbs. The remainder is either stored or used for building purposes materials like steel can! To energy costs of fertilizer, even at the risk of lower yields seminar on mineral processing,! To 10 tons/acre of slag produced in the manufacture of Portland slag Cement Babula et al., 2008.... On Downsizing technology for rural Development., pp: 81-94 ( 2002.. Of slag/hectare, the treatment and minimization of waste agent for pasture Northern! Be used as a fertilizer the world in road and railway construction and land.
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