scholarly journals Experimental study on phosphorus distribution ratio and capacity of environment-friendly dephosphorization slag for high-phosphorus hot metal pretreatment

2016 ◽  
Vol 116 (6) ◽  
pp. 581-585
Author(s):  
F. Yang
Keyword(s):  
Experimental Study ◽  
Distribution Ratio ◽  
Hot Metal ◽  
Environment Friendly ◽  
Phosphorus Distribution ◽  
High Phosphorus ◽  
Hot Metal Pretreatment ◽  
Dephosphorization Slag ◽  
Phosphorus Distribution Ratio

scholarly journals Mechanism of Phosphorus Enrichment in Dephosphorization Slag Produced Using the Technology of Integrating Dephosphorization and Decarburization

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 216
Author(s):  
Haimeng Xue ◽  
Jie Li ◽  
Yunjin Xia ◽  
Yong Wan ◽  
Liangjun Chen ◽  
...  
Keyword(s):  
Solid Solution ◽  
Distribution Ratio ◽  
Thermodynamic Calculation ◽  
Slag Composition ◽  
Slag Basicity ◽  
Hot Metal ◽  
Phosphorus Enrichment ◽  
Phosphorus Distribution ◽  
Dephosphorization Slag ◽  
Phosphorus Distribution Ratio

In order to better understand and develop the technology of integrating dephosphorization and decarburization in a single converter (abbreviated as IDDSC), the relevant thermodynamic issues were discussed by calculation. Based on the thermodynamic calculation, the bridges between the phosphorus distribution ratio, temperature, and slag composition were constructed. Besides, the connections between the dephosphorization behavior and the microstructure of slag were also established by investigating four heats of hot metal smelt using IDDSC technology. As a result, the mechanism of phosphorus enrichment in the dephosphorization slag was revealed. Also, the results show that the dephosphorization efficiency increases gradually with increasing slag basicity. While the dephosphorization efficiency increases first and then decreases with the increase of FeO content in slag. There is a competition relationship between P2O5 and FeO in reacting with CaO and SiO2. When CaO/FeO is relatively high, not enough FeO is provided. Thus P2O5 is in priority to react with CaO and SiO2 through [3n + 2](CaO) + 2SiO2 + n(P2O5) = n(3CaO·P2O5)-2CaO·SiO2(s), generating P2O5-rich nC2S-C3P solid solution which promotes the removal of [P] from the hot metal. When CaO/FeO is relatively low, FeO competes over P2O5 in reacting with CaO and SiO2 through a(CaO) + b(SiO2) + c(FeO) = aCaO·bSiO2·cFeO(s), generating CaFeSiO4 instead of P2O5-rich solid solution. As a consequence, the slag with low CaO/FeO shows a poor dephosphorization ability.

Phosphorus Distribution Equilibrium between CaO-FeO*-SiO2-P2O5(15%)-CaF2(B2O3) Slag System and Carbon-Saturated Hot Metal at 1573K

2011 ◽  
Vol 402 ◽  
pp. 227-234
Author(s):  
Jin Dong Zhou ◽  
Xue Gong Bi ◽  
Zhi Cheng Huang ◽  
Zhi Jun Wen ◽  
Fu Yang ◽  
...  
Keyword(s):  
Distribution Ratio ◽  
Equilibrium Condition ◽  
Slag System ◽  
Dramatic Reduction ◽  
Hot Metal ◽  
Phosphorus Distribution ◽  
High Phosphorus ◽  
Solid Iron ◽  
The One ◽  
Phosphorus Distribution Ratio

In order to understand the equilibrium condition of phosphorus between slag and hot metal saturated with carbon in the high phosphorus hot metal dephosphorization process, the dephosphorization capacity of CaO-FeO*-SiO2-P2O5(15%) -CaF2(B2O3) slag system at 1573 K was studied, by applying the method that phosphorus distribution ratio between slag and solid iron was firstly measured and the one between slag and hot metal was then calculated. The results showed that phosphorus distribution ratio decreased with increase in basicity of CaO/(SiO2 +P2O5), a proper increase in SiO2 content is helpful to the absorption of phosphorus into slag, an increase in FeO* content from 10.52% to 13.40% resulted in a dramatic reduction of phosphorus distribution ratio from 126.43 to 33.25, by completely substituting CaF2 with B2O3 at 2.5 of basicity and 0.07 of B2O3/CaO ratio not only was acquired a high phosphorus distribution ratio of 171, but also was decreased pollution to the environment.

Experimental Study on Soluble Oxygen in Hot Metal Pretreatment

2005 ◽  
Vol 76 (10) ◽  
pp. 715-717
Author(s):  
Bao-guo Wu ◽  
Yuan-chi Dong ◽  
Shi-jun Wang
Keyword(s):  
Experimental Study ◽  
Hot Metal ◽  
Hot Metal Pretreatment ◽  
Soluble Oxygen

Experimental Study on Desilication of the High-Phosphorus Hot Metal

2013 ◽  
Vol 291-294 ◽  
pp. 2621-2624
Author(s):  
Wei Xiong ◽  
Jie Wang
Keyword(s):  
Experimental Study ◽  
Gas Flow ◽  
Iron Ore ◽  
Rational Utilization ◽  
Hot Metal ◽  
High Phosphorus ◽  
Oxygen Efficiency ◽  
Phosphorus Iron ◽  
Western Hubei ◽  
High Phosphorus Iron Ore

In order to promote the rational utilization of high-phosphorus iron ore in western Hubei of China, the effect of process parameters on desilication rate of the high-phosphorus hot metal was investigated. The results show that the desilication rate increases slightly with indistinctive effect with the increasing of desilication agent addition. The oxygen efficiency is over 50% when desilication agent addition is about 30kg/t. Desilication rate is higher when the stirring gas flow is about 0.4l/min. Strengthening stirring of bath at the beginning period can improve kinetics condition of desilication reaction.

Thermodynamic Modelling of Phosphorus in Steelmaking Slags

2013 ◽  
Vol 32 (3) ◽  
pp. 237-246 ◽  
Author(s):  
Chunlin Chen ◽  
Ling Zhang ◽  
Jean Lehmann
Keyword(s):  
Liquid Iron ◽  
Distribution Ratio ◽  
Operating Conditions ◽  
Model Parameters ◽  
Steelmaking Slag ◽  
Maximum Point ◽  
Phosphorus Distribution ◽  
Steelmaking Slags ◽  
Model Database ◽  
Phosphorus Distribution Ratio

AbstractThe published phase diagrams of some key P2O5-containing systems which are relevant to the steelmaking slag and the available experimental data on phosphorus partitioning between liquid iron and slags consisting of SiO2-Al2O3-Fe2O3-FeO-MnO-MgO-CaO-Na2O have been reviewed and assessed. A set of data under carefully controlled experimental conditions, which was considered to be more reliable based on the assessment, was selected for optimising the generalised central atom (GCA) model parameters of phosphorus-containing slag systems. The developed model database is proved to be able to represent the liquidus temperature of some key P2O5-containing systems and the phosphorus distribution ratio between the steelmaking slags and liquid iron reasonably well. With the developed GCA model database, the dephosphorization reaction in the steelmaking process was modelled under various operating conditions such as slag chemistry and temperature. The results show that the phosphorus distribution ratio between the slags and liquid iron displays a maximum point with variation of the FeOx content in the slag. It also shows that the phosphorus deportment to the slag is favored by decreasing the operating temperature and MgO content, and increasing the CaO/SiO2 ratio in the slag. Comparison with the model of the phosphorus distribution data from a commercial BOS furnace shows that operating conditions do not permit to reach P equilibrium contents. The dis-equilibrium degree of P was found to be increased with increasing slag viscosities.

scholarly journals Recovery of Phosphorus from Dephosphorization Slag Produced by Duplex High Phosphorus Hot Metal Refining

2012 ◽  
Vol 52 (6) ◽  
pp. 955-959 ◽  
Author(s):  
Jiang Diao ◽  
Bing Xie ◽  
Yonghong Wang ◽  
Xu Guo
Keyword(s):  
Hot Metal ◽  
High Phosphorus ◽  
Dephosphorization Slag
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