Fundamental Experiment to Extract Phosphorous Selectively from Steelmaking Slag by Leaching
Fundamental Experiment to Extract Phosphorous Selectively from Steelmaking Slag by Leaching
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DOI：
10.2355/isijinternational.54.1983
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发表时间：
2014-08
影响因子：
1.8
通讯作者：
M. Numata;N. Maruoka;Sun-joong Kim;S. Kitamura
中科院分区：
文献类型：
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作者：
M. Numata;N. Maruoka;Sun-joong Kim;S. Kitamura
炼钢炉渣，包括铁水脱磷渣，通常在硅酸二钙（C2 S）饱和组成范围内。已知C2 S在宽的组成范围内与磷酸三钙（C3 P）形成伪二元固溶体，并且炉渣中的大部分磷形成固溶体。研究了固溶体和基质相在水溶液中的溶解行为，发现在不同pH值下，各元素在基质相中的溶解率均远低于固溶体中的溶解率。采用混合试剂制备CaO-SiO2-Fe 2 O3系钢渣，并将其粉碎成小于53 μm的颗粒。浸渍后，在炉渣颗粒的表面上观察到孔。选择性溶解的区域被认为是浸出之前的固溶体相。pH = 3时，固溶体中的Ca和Si在120 min后大部分溶解，而P的溶解率比Ca小约65%。与基质成分相比，残渣中CaO/SiO2比值接近基质，P2 O 5/Fe 2 O3比值略大于基质。XRD分析表明，对应于固溶体的峰在残余物中消失。残渣与溶渣的质量比接近于浸出前基质与固溶体的质量比。
Steelmaking slag, including hot metal dephosphorization slag, is usually in the dicalcium silicate (C2S) saturated composition range. C2S is known to form a pseudo-binary solid solution with tricalcium phosphate (C3P) over a wide composition range, and most of the phosphorus in the slag forms a solid solution. The authors investigated the dissolution behavior of the solid solution and matrix phases in aqueous solutions, and the dissolution ratio of each element in matrix phase was much lower than that in the solid solution at every pH. To clarify the possibility of selective extraction of the solid solution from slag, leaching experiments were conducted on the steelmaking slag. The CaO–SiO2–Fe2O3 steelmaking slag system was made by a mixture of reagents and ground into particles smaller than 53 μm. After immersion, holes were observed on the surface of the slag particles. The area that selectively dissolved is considered as the solid solution phase prior to leaching. At pH 3, most of the Ca and Si in the solid solution dissolved after 120 min; however, the dissolution ratio of P was approximately 65% smaller than that of Ca. Compared to the matrix composition, the CaO/SiO2 ratio in the residue was close to the matrix and P2O5/Fe2O3 ratio was slightly larger than that of the matrix. XRD analysis revealed that the peak corresponding to the solid solution disappeared in the residue. The mass ratio of the residue to the dissolved slag was close to the ratio of the matrix to the solid solution before leaching.