Metall. Res. Technol.
Volume 116, Number 3, 2019
|Number of page(s)||12|
|Published online||26 April 2019|
Dissolution mechanism of various elements from steelmaking slag into citric acid solution
School of Metallurgical Engineering, Anhui University of Technology,
243032, PR China
2 Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Anhui University of Technology), Ministry of Education, Maanshan 243002, PR China
* e-mail: firstname.lastname@example.org
Accepted: 13 November 2018
To recycle valuable elements from steelmaking slag, their dissolution mechanism into citric acid solution has been investigated. First, the relationship between dissolution ratio of each element and initial concentration of citric acid (ci) was studied. Then, the concentrations of each species in solution were calculated through mass balance. Based on these results, it can been seen that when ci = 0.00104 mol/L, Ca2+, CaCit−, MgCit−, FeH2PO42+ and CaHPO4 are the predominant species in solution, and Ca5(PO4)3(OH)(s) precipitate can form easily, which may suppress the dissolution of elements. When ci increases to 0.0104 mol/L, dissolution ratio of each element increases significantly, except for iron. And the predominant species correspondingly change to Ca2+, Mg2+, CaCit−, MgCit−, H2Cit−, H3Cit and FeH2PO42+.
Key words: dissolution mechanism / steelmaking slag / valuable element / citric acid solution / existent form of element
© EDP Sciences, 2019
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