Experiment Study on the Removal of Phosphorus in Eutrophic
· Experimental results of Dietfried Donnert and Manfred Saleker show that dephosphorization by calcite is effective when phosphorus concentration is above 10 mg/L. Experiments done by Li Zuyin Lü Jialong 13 on P-fixing characteristics of calcium carbonate shows that dephosphorization by calcite is related to the initial phosphorus concentration of the solution.
Get Price
2016SCI-
· 2016SCI. Chen Ailiang Li Mengchun Qian Zhen Ma Yutian Che Jianyong Ma Yalin. Hemimorphite Ores A Review of Processing Technologies for Zinc Extraction. Removal of tungsten from the sodium molybdate solution using nascent MnO2.
Get PriceParameters Affecting Dephosphorization of Stainless Steel
· dephosphorization independently of temperature chromium content and the decomposition of the dephosphorization mixture. 5 Fig. (2). Effect of basicity on degree of dephosphorization. 1 3.3 Carbon and chromium content Industrial experiments on making low phosphorus stainless steel from high chromium pig iron with
Get Price
Experiment Study on the Removal of Phosphorus in Eutrophic
· Dephosphorization rate is high at initial P concentration of 5 mg/L and P can be removed by 88.48 The dephosphorization rate can reach 69.94 when the phosphorus concentration is 3 mg/L at 1.2 mg/L initial concentration only 12.68 P could be removed. (3) High temperature increases dephosphorization rate.
Get Price
Feasibility Study of Dephosphorization of Slag Generated
· Basic oxygen furnace slag (BOF slag) is an unavoidable by-product of steelmaking process of basic oxygen furnace. The main chemical constituents of BOF slag are CaO FeO Al 2 O 3 SiO 2 and MgO. Due to its high metallic value (FeO 16-20 ) and lime content (CaO 45-50 ) it is possible to use in iron making and steelmaking process to replace lime and recover iron and CaO.
Get Price
THE SLAG COMPOSITION INFLUENCE ON THE
· This study analyzes the influence of the slag composition on the extent of EAF hearth refractory wear and especially on the dephosphorization effectiveness (expressed as practical phosphorus distribution between slag and metal Φp). The statistical treatment of plant data from 24 campaigns of EAF was conducted. It was found that increase of CaO basicity CaO/FeO ratio and
Get Price
Reducing Dephosphorization of Molten Stainless Steel by
effectiveness of reducing dephosphorization by metal-lic calcium in an industrial electric arc furnace has been examined. Further an investigation has been done for safety treatment of slags produced by the dephosphorization process. II. Experimentals 1. Laboratory Scale Dephosphorization Experiment
Get Price
Science of the Total Environment
nally the effectiveness of Ca(ClO) 2 on phosphorus fixation and patho-gens inactivation in fermentation residues are also demonstrated. It provides a novel way to enhance the VFAs production with simulta-neous phosphorus removal in fermentation liquids and pathogens re-duction in fermented residues during WAS fermentation which might
Get Price
Technical Report Improvement in Hot-Metal
· The ratio (P)/ P near 100 in the slag basicity range of 1.0 to 1.5 indicates that effective dephosphorization is possible even when slag basicity is low. However when ( T.Fe) is excessively high (P)/ P decreases owing to dilution of basicity components.
Get Price
2016SCI-
· 2016SCI. Chen Ailiang Li Mengchun Qian Zhen Ma Yutian Che Jianyong Ma Yalin. Hemimorphite Ores A Review of Processing Technologies for Zinc Extraction. Removal of tungsten from the sodium molybdate solution using nascent MnO2.
Get PriceTrial on the Application of Capillary Phenomenon of Solid
effectiveness for desulfurization and dephosphorization. However this may lead to some CaO remaining in the solid phase resulting in an increase in slag volume and a possi-ble decrease in reaction efficiency. In addition the use of CaF 2 for producing liquid flux of high basicity has been limited due to environmental issues.3) A new
Get Price
Dephosphorization ofStainless Steels
· Dephosphorization under reducing conditions is a new concept and is effective for alloys containing a large amount of chromium. Test data on the use of Ca-CaF2 and CaC2-CaF2 fluxes are shown and the importance ofthe post-treatmentof spent fluxes is pointed out for environmental reasons.
Get PriceOptimization of Process Parameters for the
· the process variables for the dephosphorization of iron ore using nitric acid. Standard central composite design with 23 full factorial was used to develop the model. The model was optimized using Matlab. The surface responses of the plots show that concentration interacted effectively with leaching time and particle size.
Get Price
THE SLAG COMPOSITION INFLUENCE ON THE DEPHOSPHORIZATION
2 Experimental methods The influence of the most important slag constituents (CaO MgO FeO MnO SiO2 Al2O3) on the lifetime of EAF hearth refractory lining and on the dephosphorization effectiveness was graphically investigated by using statistical analysis of EAF plant data (metal and slag compositions refractory wear levels practical
Get Price
Study on dephosphorization mechanism by roasting iron
· Study on dephosphorization mechanism by roasting iron ore pellets with high phosphorus content Yangping Wu Yuanzheng Guo and Xiaocan Zhong School of North China University of Science and Technology Tangshan 063000 China Abstract Based on high phosphorus pellets as the research object combined with Factsage7.1
Get Price
THE EFFECTIVENESS OF DEPHOSPHORIZATION WITH
· Effective dephosphorization in the steelmaking processes (including EAF process) requires optimal content of iron oxides in the slag (ideally 2035 wt ) 3 4 . It also requires lower temperatures and higer values of slag basicity 2 3 . The level of iron oxides (in further FeO) in the EAF slag is related to the scrap and charge quality addition of oxidative fluxes but above all it´s linked with the parameters of oxygen blowing. The temperature is continuously rising throughout the heat. Due to danger of rephosphorization it´s very important not to exceed neither the critical content of FeO nor the critical temperature. In general the high basicity level is provided by charging of lumpy metallurgical or dolomitic lime in the beginning of the heat. The common problem is a slow dissolution of conventional basic lumpy fluxes. Better dissolution requires longer time or higher temperatures (this is undesirable due to danger of rephosphorization)
Get Price
Method for removing slag on the surface of molten metal by
To confirm the effectiveness of the present invention the inventors desiliconized mOlten iron discharged the resulting slag performedsimultaneous dephosphorization and desulfurization on the molten iron at C with a CaO -flux and oxygen added 200 to 600 kg of various fluidity modifiers to 3 tp 4 tonnes (in this specification "tonne
Get Price
Performance of constructed wetlands with different
· Therefore the denitrification and dephosphorization performance were the key factors for the advanced treatment process (Wang et al. 2016). Compared with many other wastewater treatment technologies constructed wetlands (CWs) can be easily constructed which provides an advantage in denitrification and dephosphorization performance.
Get Price
Dephosphorization by Double-Slag Process in Converter
· Efficient dephosphorization by double-slag process Temperature at the end of the dephosphorization stage. Figure 3 shows the change principles of the dephosphorization ratio versus temperature. With an increase in temperature the dephosphorization ratio also increased to achieve an average of 51.74 over this period (T<1660 K/1387 °C).
Get Price
Materials Free Full-Text Preparation of a New Iron
Biological dephosphorization methods have lower operating costs but the effectiveness of dephosphorization generally does not exceed 30 . Biological dephosphorization has low stability and strict operation requirements. The effectiveness of dephosphorization is greatly affected by wastewater temperature and pH . Therefore it is necessary to research and develop new efficient and feasible
Get Price
Investigations of the Dephosphorization of Liquid Iron
However although few data points were used a statistically important correlation was found for chromium losses to the slag and the contents of chromium lime iron oxide and the process temperature pct Cr2O3 0 88 pct Cr 0 29 pct FeO 0 25 pct CaO 49 77 on the effectiveness of dephosphorization.
Get Price
Experiment Study on the Removal of Phosphorus in Eutrophic
· Dephosphorization rate is high at initial P concentration of 5 mg/L and P can be removed by 88.48 The dephosphorization rate can reach 69.94 when the phosphorus concentration is 3 mg/L at 1.2 mg/L initial concentration only 12.68 P could be removed. (3) High temperature increases dephosphorization rate.
Get PriceTrial on the Application of Capillary Phenomenon of Solid
effectiveness for desulfurization and dephosphorization. However this may lead to some CaO remaining in the solid phase resulting in an increase in slag volume and a possi-ble decrease in reaction efficiency. In addition the use of CaF 2 for producing liquid flux of high basicity has been limited due to environmental issues.3) A new
Get Price
Method for removing slag on the surface of molten metal by
To confirm the effectiveness of the present invention the inventors desiliconized mOlten iron discharged the resulting slag performedsimultaneous dephosphorization and desulfurization on the molten iron at C with a CaO -flux and oxygen added 200 to 600 kg of various fluidity modifiers to 3 tp 4 tonnes (in this specification "tonne
Get PriceFeO content estimation in steel slag using Raman
· desulphurization dephosphorization and deoxidation of steel as well as wear of refractory linin absorption of impurities introduced along with charge material Steelmaking slag is of much lower density than iron reaching from 3200 the effectiveness of steelmaking process. Raman spectroscopy provides detailed information about the material
Get Price
Materials Free Full-Text Preparation of a New Iron
Biological dephosphorization methods have lower operating costs but the effectiveness of dephosphorization generally does not exceed 30 . Biological dephosphorization has low stability and strict operation requirements. The effectiveness of dephosphorization is greatly affected by wastewater temperature and pH . Therefore it is necessary to
Get Price
Optimization of Process Parameters for the
· Optimization of Process Parameters for the Dephosphorization of iron ore using Nitric Acidwritten by T. O. Chime O. D. Onukwuli I. O. Ani published on 2016/10/06 download full article with reference data and citations
Get Price
Optimization of Process Parameters for the
· Optimization of Process Parameters for the Dephosphorization of iron ore using Nitric Acidwritten by T. O. Chime O. D. Onukwuli I. O. Ani published on 2016/10/06 download full article with reference data and citations
Get Price
Dephosphorization of Hot Metal Containing High
· Effectiveness of Dephosphorization. The dephosphorization efficiency eta_ text P is calculated with the following formula where text P _ i represents the phosphorus content in hot metal before dephosphorization text P _ t represents the phosphorus content in hot metal before dephosphorization.
Get Price
