Innovations in steelmaking technology and hidden phosphorus flows

Matsubae, Kazuyo; Yamasue, Eiji; Inazumi, Tadahiro; Webeck, Elizabeth; Miki, Tsuneharu; Nagasaka, Tetsuya

doi:10.1016/j.scitotenv.2015.09.107

Cited by 24 publications

(8 citation statements)

References 21 publications

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“…It is likely that the increased cost involved in utilizing high-P iron ores could be covered by the income generated by the sale of the recovered phosphate product and the savings resulting from the recycling of steelmaking slag after P separation. 7) Developing an effective and economic process to recover P from slag with high P 2 O 5 content plays a significant role in stimulating the utilization of high-P iron ores, simultaneously ensuring the reliable supply of phosphate fertilizers as the global population increases.…”

Section: Optimum Conditions For Phosphorus Recovery From Steelmaking mentioning

confidence: 99%

Optimum Conditions for Phosphorus Recovery from Steelmaking Slag with High P2O5 Content by Selective Leaching

Gao

Ueda

et al. 2018

ISIJ Int.

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Section: Optimum Conditions For Phosphorus Recovery From Steelmaking mentioning

confidence: 99%

Optimum Conditions for Phosphorus Recovery from Steelmaking Slag with High P2O5 Content by Selective Leaching

Gao

Ueda

et al. 2018

ISIJ Int.

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“…Since the world's population is increasing, more production of food and fertilizers is needed (van der Salm et al, 2016;Wu et al, 2016). However, the natural supplies of phosphate rock are non-renewable and it is predicted that deposits will be exhausted in 30-300 years (Mew, 2016;Reijnders, 2014); no material can substitute for the role of P in the production of fertilizers (TU DARMSTADT, 2007;Matsubae et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Insight into chemical phosphate recovery from municipal wastewater

Ngo

Guo

et al. 2017

Science of The Total Environment

238

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Phosphate plays an irreplaceable role in the production of fertilizers. However, its finite availability may not be enough to satisfy increasing demands for the fertilizer production worldwide. In this scenario, phosphate recovery can effectively alleviate this problem. Municipal wastewater has received high priority to recover phosphate because its quantity is considerable. Therefore, phosphate recovery from municipal wastewater can bring many benefits such as relieving the burden of increasing production of fertilizers and reduction in occurrence of eutrophication caused by the excessive concentration of phosphate in the released effluent. The chemical processes are the most widely applied in phosphate recovery in municipal wastewater treatment because they are highly stable and efficient, and simple to operate. This paper compares chemical technologies for phosphate recovery from municipal wastewater. As phosphate in the influent is transferred to the liquid and sludge phases, a technical overview of chemical phosphate recovery in both phases is presented with reference to mechanism, efficiency and the main governing parameters. Moreover, an analysis on their applications at plant-scale is also presented. The properties of recovered phosphate and its impact on crops and plants are also assessed with a discussion on the economic feasibility of the technologies.

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“…In particular, increased demand for food, owed to global population growth, consequently increases the demand for P. Because of the depletion of high-grade natural phosphate ores, the P hidden in steelmaking slag is regarded as a secondary phosphate source. 2) Consequently, with regard to the steelmaking industry, it is important to develop an efficient method to recover P from steelmaking slag to lower production costs and save resources. Several methods have been explored.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Phosphorus from Modified Steelmaking Slag with High P2O5 Content via Leaching and Precipitation

Gao

Ueda

et al. 2018

ISIJ International

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The P contained in steelmaking slag is regarded as a potential phosphate source, especially with regard to slag with high P 2 O 5 content, which is generated from the utilization of high P iron ores. If P can be efficiently extracted from slag, the obtained P can be used as a phosphate fertilizer. Moreover, the remaining slag can be recycled inside the steelmaking process. Compared with other phases, the P-condensed C 2 S-C 3 P solid solution in slag is more easily dissolved in water; therefore, selective leaching was applied to recover P from slag with high P 2 O 5 content. In this study, the effect of K 2 O modification on P dissolution in the citric acid solution was investigated, and subsequently, a process for extracting phosphate product from the leachate, via precipitation, was explored. It was determined that K 2 O modification promoted dissolution of the solid solution, resulting in a higher dissolution ratio of P. By modification, the majority of the solid solution was dissolved at pH 6, and other phases remained in residue, indicating that a better selective leaching of P occurred. As the pH decreased, the dissolution ratios of both P and Fe increased. Following leaching at pH 5, a residue with a higher Fe 2 O 3 content and lower P 2 O 5 content was obtained. When the pH of the leachate increased, the dissolved P in the aqueous solution was precipitated. Through separation and calcination, a phosphate product with a P 2 O 5 content of 30% was obtained, which has the potential to be used as a phosphate fertilizer.

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Innovations in steelmaking technology and hidden phosphorus flows

Cited by 24 publications

References 21 publications

Optimum Conditions for Phosphorus Recovery from Steelmaking Slag with High P<sub>2</sub>O<sub>5</sub> Content by Selective Leaching

Optimum Conditions for Phosphorus Recovery from Steelmaking Slag with High P<sub>2</sub>O<sub>5</sub> Content by Selective Leaching

Insight into chemical phosphate recovery from municipal wastewater

Recovery of Phosphorus from Modified Steelmaking Slag with High P<sub>2</sub>O<sub>5</sub> Content via Leaching and Precipitation

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