Vanadium extraction and dephosphorization from V-bearing hot metal with fluxes containing CaO

Abstract

Extracting vanadium and removing phosphorus simultaneously by adding CaO containing materials to V-bearing hot metal were investigated under the condition of simulating the process of vanadium extraction with insufficiently supplying oxygen in converter. Through preliminary experiments, 3 h and 1375 °C were chosen as the optimum holding time and reaction temperature for formal experiments, respectively. The results of the formal experiments suggest that making basic slag can extract vanadium and remove phosphorus simultaneously. The vanadium extraction rate (η_V) and phosphorus removal rate (η_P) both increase with an increase in the basicity of the original slag materials and the Fe₂O₃ contents. The vanadium distribution ratio (L′_V) is about an order of magnitude greater than the phosphorus distribution ratio (L′_P), but the latter is more sensitive to slag basicity than the former. The phosphorus distribution ratio is beyond 6 when the basicity of the original slag materials is beyond 1, which indicates a much better performance of phosphorus removal compared to the phosphorus removal in the current process. Therefore, it is very feasible to properly raise slag basicity to remove phosphorus with consideration of the grade of vanadium slag. The relations between η_V and η_P, and between L′_V and L′_P are linear under the experimental conditions.

Keywords

vanadium extraction / phosphorus removal / basicity / vanadium distribution ratio / phosphorus distribution ratio

References

[1] FuZ-bi. Development process and trends of vanadium extraction from vanadium-titanium magnetite ore [J]. China Nonferrous Metallurgy, 2011, 6: 29-33

[2] ChenH-sheng. Study on extracting V₂O₅ from roasted vanadium slag with lime [J]. Iron Steel Vanadium Titanium, 1992, 13(6): 1-9

[3] ZhangY-l, ZhaoFei. Effects of influencing factors on distribution behaviors of vanadium between hot metal and FeO-SiO₂-MgO(-TiO₂) slag system [J]. Steel Research International, 2011, 82(8): 940-950

[4] DongP-qiao. Current situation of the converter semi-steel steelmaking technology in China [J]. Steelmaking, 1997, 2: 62-64

[5] LI Hong, SONG Wen-chen, NIU Si-tong, NIU Shi-zhen, GUO Luo-fang. A method of energy conservation and emission reduction to treat molten vanadium bearing slag: China, CN102086487A [P]. 2011–06–08. (in Chinese)

[6] SongW-c, LiH, LiK, ZhengQuan. New process of vanadium extraction from molten vanadium slag [J]. Nonferrous Metals (Extractive Metallurgy), 2013, 7: 35-37

[7] SongW-c, LiHong. A new process for vanadium extraction from molten vanadium slag by direct oxidation and sodium activating method [J]. Iron Steel Vanadium Titanium, 2012, 33(6): 1-5

[8] LiK, SongW-c, ZhengQ, LiHong. Vanadium extraction by acid leaching after calcification of molten vanadium slag [J]. Iron Steel Vanadium Titanium, 2013, 34(5): 15-18

[9] InoueR, SuitoH. Distribution of vanadium between liquid iron and MgO saturated slags of the system CaO-MgO-FeO_x-SiO₂ [J]. Transactions ISIJ, 1982, 22(9): 705-714

[10] BasuS, LahiriA K, SeetharamanS. Phosphorus partition between liquid steel and CaO-SiO₂-P₂O₅-MgO slag containing low FeO [J]. Metallurgical and Materials Transactions B, 2007, 38(3): 357-366

[11] ShinD Y, WeeC H, KimM S, YouB D, HanJ W, ChoiS O, YunD J. Distribution behavior of vanadium and phosphorus between slag and molten Steel [J]. Metals and Materials International, 2007, 13(2): 171-176

[12] WuW, MaS, ZouZ-s, GuoZ-h, WuD-r, ZhaoG-guang. Phosphorus distribution ratio between highly basic Cao-FetO based slags and molten steel at 1600 °C [J]. Journal of Materials and Metallurgy, 2003, 2(2): 83-87

[13] YangS-b, LuoZ-z, CaiK-k, JiangJ-p, SongBo. Thermodynamic study on distribution of vanadium between melt and slag in BOF [J]. Iron and Steel, 2006, 41(3): 36-38

[14] ZhangJ-yunPhysical chemistry in metallurgy [M], 2004Beijing, ChinaMetallurgical Industry Press312

[15] Iron and Steel Institute of Japan. Handbook of iron and steel (I) [M]. Tokyo, Japan: Maruzen Company Limited, 1981: 14. (in Chinese)

[16] HuangD-xinVanadium extraction and steelmaking [M], 2000Beijing, ChinaMetallurgical Industry Press21

[17] XuK-d, XiaoL-jun. Theoretical analysis of hot metal dephosphorization pretreatment in converter [J]. Journal of Shanghai University (Natural Science), 2011, 17(4): 331-336

[18] HuangX-huPrinciple of ferrous metallurgy [M], 2002Beijing, ChinaMetallurgical Industry Press170

[19] ColcloughT P, ScM, MetB. A study of the reactions of the basic open-hearth furnace [J]. Transactions of Faraday Society, 1925, 21: 202-223

[20] ColcloughT P, MetB. The constitution of basic slags: its relation to furnace reactions [J]. Journal of Iron and Steel Institute, 1923, 107: 267-272

[21] WermeA, AstromC. Recovery of vanadium from hot metal-thermodynamics and injection applications [J]. Scandinavian Journal of Metallurgy, 1986, 15(6): 273-278

[22] WangX-huaFerrous metallurgy-steelmaking [M], 2007Beijing, ChinaHigher Education Press28