Dephosphorization of Hot Metal Containing High Phosphorus Using F-free CaO-SiO2-Al2O3-Fe2O3 Slag
Dephosphorization of Hot Metal Containing High Phosphorus Using F-free CaO-SiO2-Al2O3-Fe2O3 Slag
复制标题
无氟CaO-SiO2-Al2O3-Fe2O3渣脱磷高磷铁水
DOI：
10.1007/s12666-021-02261-2
复制
发表时间：
2021
影响因子：
1.6
通讯作者：
Lv Changji
中科院分区：
文献类型：
--
作者：
Xue Haimeng;Li Jie;Xia Yunjin;Wan Yong;Chen Liangjun;Lv Changji
随着国内低品位高磷铁矿石的大量使用，我国产生了大量高磷（> 0.35%）铁水。为解决高磷铁水脱磷问题，同时避免CaF 2熔剂带来的环境问题，设计了一种CaO-SiO2-Al 2 O3-Fe 2 O3无氟渣系用于高磷铁水脱磷，并结合FactSage软件在1400 °C下进行了系统的试验分析。结果表明，采用无氟CaO-SiO2-Al 2 O3-Fe 2 O3渣系是高磷铁水脱磷的有效途径。这种脱磷的主要驱动力来自（C2 S-C3 P）相的沉淀，它提供了稳定渣中磷的位点，降低了液态渣中磷的活性。碱度的增加通过促进富磷的C2 S-C3 P相的析出而促进脱磷过程。渣中Fe 2 O3通过改善渣的氧化性，有利于高磷铁水采用CaO-SiO2-Al 2 O3-Fe 2 O3渣系脱磷。渣中的Al 2 O3与P2 O 5竞争与CaO、SiO2联合收割机结合，抑制了C2 S-C3 P的形成，从而削弱了渣的脱磷能力。
With the extensive usage of domestic low-grade iron ore with high phosphorus, abundant high (> 0.35%) phosphorus hot metal generates in China. To solve the dephosphorization issue of high-P hot metal under the premise of avoiding the environmental problem caused by CaF2flux agent, a type of F-free CaO–SiO2–Al2O3–Fe2O3slag was designed for the dephosphorization of high-P hot metal and systematically tested and analyzed combined with FactSage software under 1400 °C in this paper. The results show that it is an effective approach to remove phosphorus from hot metal-containing high phosphorus using F-free CaO–SiO2–Al2O3–Fe2O3slag. The major driving force for this dephosphorization comes from the precipitation of(C2S-C3P) phase which lowers the activity of phosphorus in liquid slag by providing a site to stabilize phosphorus in slag. The increase of basicity enhances the dephosphorization process by promoting the precipitation of the P-rich C2S-C3P phase. The Fe2O3in slag favors the removal of phosphorus from hot metal-containing high phosphorus using CaO–SiO2–Al2O3–Fe2O3slag by improving the oxidability of slag. The Al2O3in slag will compete with P2O5to combine with CaO and SiO2, which inhibits the formation of C2S-C3P and thus weakens the dephosphorization ability of slag.