process to convert steel slag into fertilizers
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- process to convert steel slag into fertilizers
1. Introduction. Steel slag is the main solid waste generated in the steel-making process, accounting for 15 to 20% of crude steel output [1].China's crude steel output in 2021 was 1.035 billion tons [2], more than half of the global crude steel output (1.9505 billion tons) [3], and the steel slag output exceeded 120 million tons.In contrast, …
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The possibility of using converter slag as an iron (Fe) fertilizer in some calcareous soils was investigated. Slag used contained 16.83% Fe2O3 and 6.87% FeO plus a relatively large amount of ...
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refining operation, after steel pouring into a ladle, the slag is poured into a vessel and is subsequently tapped into a slag pot. Fig. 1. The iron ore based steelmaking. The main by-products resulting by ironmaking and steelmaking are slags (that represent 90% of the total by-products), dusts and sludges. On the average about 200 kg of by-
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In 1882, Wagner, a German, reported that slag produced in the Thomas converter process could be made into phos- phate fertilizer.2) "Thomas phosphate fertilizer" manufactured from ground converter steelmaking slag soon became widespread as it proved to be a …
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cost advantages huge, but the Germans (who adopted the "basic" process immedia tely) also mana ged to convert the phosphoric slag into a useful fertilizer. While the Bessemer and Siemens -Martin pro cesses pro duced bulk steel at rapidly falling prices, high -quality steel continued for a long time to be produced in Sheffield using the old cruci -
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The obtained calcium phosphate can be directly used as a slow-release phosphate fertilizer, and the P-removal slag containing Fe, Mg, and Mn can be reused within the metallurgical process. Compared to the steelmaking slag studied previously, BOF slag has a low P 2 O 5 content and not very high dissolution ratio of P, and thus the …
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The feasibility of steel slag used as an iron fertilizer was studied in a pot experiment with corn. Slag alone or acidified slag was added to two Fe-deficient …
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Design of a Novel Fertilizer Made of Steelmaking Slag Using the Glassy Phase of the CaO–SiO2–FeO System. Part I: Optimization on the Slag Chemistry and …
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In 2019, the world's crude steel production was 2.196 billion tons [].According to the main smelting process, steel slag can be divided into basic oxygen furnace (BOF) slag (also known as converter slag) and electric furnace (EAF) slag [].The molten steel slag produced from the steelmaking furnace goes through different means of processing, …
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Ecotoxicity and bioavailability of heavy metals (HMs) from steel industrial waste and the overuse of chemical fertilizers are the two prime environmental concerns. By using vermicomposting technology, steel industrial waste slag was transformed into valuable organic fertilizers for agricultural purposes. The primary goal of the research …
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Steel making process in electric arc furnaces generates up to 15 % of slag, which is, based on its properties, classified as non-hazardous waste. Disposal of such material requires large surfaces ...
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Thermal insulation and sound absorption effects when made into a fibre: Raw material for rock wool: Fertilizer component (CaO, SiO2) ... Steel-making slag: Converter slag, electric arc furnace slag: Hard, wear-resistant: ... When employed in the road construction process, steel slag provides economies of scale, answering India's …
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An approach to leach phosphorus from slag was applied to commercial fertilizers made from steelmaking slag, which has relatively coarse grains. After leaching at pH 3 with citric acid,...
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According to the different processes used, steel slag can be divided into converter slag, electric furnace slag, refining slag, casting residue slag and iron pretreatment slag [5], water-quenched ...
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The dumping of a large amount of steel slag not only wastes metal resources, but pollutes the ecological environment. In this study, a method for recovery of vanadium, titanium, iron, magnesium, and synthesizing anhydrite from steel slag is proposed. The leaching efficiency of V, Ti, Fe, and Mg was 99.42%, 99.36%, 99.89%, …
به خواندن ادامه دهیدa promising way to increase the reactivity of converter slag and enable recycling as a cement replacement and this is the first in-depth characterization of air granulated steel slag. In this study converter slag was separated into different fractions (0.25-0.5 mm, 0.5-1 mm, 1-2 mm, 2-4 mm) after air granulation to study the influence of
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Steel - Basic Oxygen, Refining, Alloying: More than half the world's steel is produced in the basic oxygen process (BOP), which uses pure oxygen to convert a charge of liquid blast-furnace iron and scrap into steel. The …
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PDF | The possibility of using converter slag as an iron (Fe) fertilizer in some calcareous soils was investigated. Slag used contained 16.83% Fe2O3 and... | Find, …
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The possibility of using converter slag as an iron (Fe) fertilizer in some calcareous soils was investigated. Slag used contained 16.83% Fe2O3 and 6.87% FeO plus a relatively large amount of ...
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Properties and Uses of Steelmaking Slag. Steelmaking slag is an integral part of the steelmaking process. It is produced during the separation of the liquid steel from impurities in steelmaking furnace and …
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Steel slag is one of the most common waste products from the steelmaking industry. Conventional methods of slag disposal can cause negative impacts on humans and the environment. In this paper, the process of …
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and composition adjustment. The yield of iron/steel slag is about 300 kg/t-p per ton of pig iron for blast furnace slag and about 100-150 kg/t-s per ton of molten steel for …
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These studies aimed to separate P and Fe in steel slag, and obtain cleaner iron-rich products with sufficiently high iron contents and low levels of impurities to be reused or recover P-rich phase to produce phosphate fertilizer. When steel slag is being recycled in steelmaking process to substitute the original dephosphorization agent, the ...
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Innovative process for extracting active silicon from iron and steel slag to utilize as fertilizer
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The aim of this study was to investigate if electric arc furnace (EAF) slag generated during steel production could have an application as a soil enhancer in agriculture. For that purpose, a greenhouse experiment was conducted on common beans (Phaseolus vulgaris) cultivated in soil enriched with EAF slag (at 1% and 2% level), …
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Abstract. The current utilization rate of steel slag is only 22% in china, far behind the developed countries. At present, the amount of slag deposited in storage yard adds up to 30Mt, leading to the occupation of farm land and serious pollution to the environment. Improving the slag utilization is an important way to resolve these problems.
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In a study by Eloneva et al. aimed at dissolving the calcium content of steel converter slag and calcium carbonate precipitation from that solution, 16 different solvents were investigated to find ...
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Slag is the by-product of iron- and steelmaking processes. Normally, around half to one tonne of slag would be generated for yielding one tonne of rolled iron or steel (Lobato et al. 2015).It was reported that the world steel production was 1.9 billion tonnes in 2016, which suggested that at least around 1 billion tonnes of slag is produced during the …
به خواندن ادامه دهید• What are the current barriers to use steel slag as fertilizer? Production process; separation, preparation of suitable slags Legal aspects (national, EU-Level) • Research …
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Physical and chemical and mineralogical characteristics of LD steel slag. It has been found that the density of LD slag lies between 3.3-3.6g/cm. 3 Due to its high Fe content, steel slag looks in appearance a loose collection, and appears hard and wear resistant. The grindability index of steel slag is 0.7, in contrast with the value of 0.96 and 1.0 for blast …
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the main smelting process, steel slag can be divided into basic oxyg en furnace (BOF) ... Steel converter slag (SCS) 2. ... C.A. Steel Slag as an Iron Fertilizer for Corn Growth and Soil ...
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Abstract. Fertilizers made of steelmaking slag are important inexpensive materials for recovering degraded paddy fields. The results of our previous works showed that essential Ca and Si elements were effectively supplied by the dicalcium silicate phase (C 2 S) while the glassy phase of the CaO–SiO 2 –FeO system served as an Fe source. …
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Flowsheet for processing slag into lime fertilizers (includes autogenous grinding). Modern steetmaking slag plants usually take one of the following forms: production of sized slag …
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Most of the steel is produced using the blast furnace-converter process. Fig. 2 (b) schematically shows phosphorus from molten steel to slag during the BOF (Basic Oxygen Furnace) steelmaking process. Beneficial from the steelmaking process, the phosphorus content in the iron ore (approximately 0.07 to 2 mass% P 2 O 5) is greatly …
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During the puddling, phosphorus was converted to iron phosphide, resulting in dissolution into puddle slag. Because the wrought iron was then subjected to a slag-off process, the amount of phosphorus (0.4%) in molten pig iron was decreased to 0.03% in wrought iron (Inazumi 2009). As described previously, the effects of phosphorus were …
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