Effect of Boron Mud on Melting Temperature of CaO-Based Steelmaking Slag

2012 ◽  
Vol 535-537 ◽  
pp. 647-650
Author(s):  
Hong Ming Wang ◽  
Gui Rong Li ◽  
Ting Wang Zhang ◽  
Li Li Yang ◽  
Xiang Zhu ◽  
...  
Keyword(s):  
Melting Temperature ◽  
Steelmaking Slag ◽  
Remarkable Effect ◽  
Melting Properties ◽  
Boron Mud ◽  
Fluxing Agent

For the elimination of the fluorine pollution of steelmaking slag, boron mud is employed as fluxing agent for CaO-based fluorine-free slag. The effect of boron mud on the melting properties of slag is investigated. Hemisphere method is used to determine the melting temperature of samples. The results indicate that when the content of boron mud is lower than 7%, the melting temperature can be decreased by boron mud. With the content of boron mud increasing higher than 7%, the melting temperature is increased with increase of boron mud content. The basicity and the content of F2O3 have remarkable effect on the melting temperature of boron mud containing slag. When the basicity is in scope of 2.0-5.0, the melting temperature is in the range of 1350-1450°C correspondingly. The melting temperature of boron mud containing slag can be decreased significantly with increase of F2O3 content.

Effects of B2O3 and CaF2 on Melting Properties of CaO-Based Slags

2012 ◽  
Vol 217-219 ◽  
pp. 511-514
Author(s):  
Hong Ming Wang ◽  
De Fu ◽  
Gui Rong Li ◽  
Xiang Zhu ◽  
Zhao Zhao ◽  
...  
Keyword(s):  
Melting Temperature ◽  
Steelmaking Process ◽  
Melting Temperatures ◽  
Steelmaking Slags ◽  
Melting Properties ◽  
Fluxing Agent

B2O3 is employed as fluxing agent of CaO-SiO2-Fe2O3 steelmaking slags to substitute for CaF2. The influences of B2O3 and CaF2 on the melting properties of this system slags were investigated and compared. The results indicate that the fluxing effect of B2O3 is more remarkable than that of CaF2. Therefore, B2O3 promotes the dissolution of CaO, SiO2 and 2CaO•SiO2, etc, then the slagging speed can be improved greatly. The melting temperatures of slags increase with the increasing of basicity, especially, when CaF2 is used as fluxing agent as well as the basicity is up to 5.0, the melting temperature is increased higher than 1420°C. These characteristics of boron-containing slgas are more suitable for steelmaking process than those of fluoride-containing slags.

Research on the Melting Temperature of CaO-SiO2-B2O3 Ternary Slag Systems

2013 ◽  
Vol 575-576 ◽  
pp. 370-373 ◽  
Author(s):  
Li Li Yang ◽  
Hong Ming Wang ◽  
Xiang Zhu ◽  
Gui Rong Li
Keyword(s):  
Melting Temperature ◽  
Slag System ◽  
Boron Mud ◽  
Fluxing Agent ◽  
Slag Melting

The melting temperature of CaO-SiO2-B2O3-(boron mud, CaF2) slag system was investigated. The slag melting temperature was measured by using the hemisphere method. The results indicate that B2O3 has a significant fluxing effect on the slag system. When 1%-11% B2O3 was employed as fluxing agent, the melting temperature of the slag changed from 1525°C to 1200°C. When the content of B2O3 is 5% and the range of basicity is 1.5~3.5, the melting temperature of the slag increases with the increase of the basicity. However, when boron mud or CaF2 was added to the slag, the melting temperature of the slags decreased with the increase of addition at a fixed B2O3 content (5%) and a fixed basicity (R=2.5). Furthermore, the melting temperature of the slag system which contains CaF2 is lower than the slag system which contains boron mud.

Melting Properties of Preparing Compound Desulphurizer by Aluminothermy Reducing Caustic Calcined Dolomite

2013 ◽  
Vol 634-638 ◽  
pp. 3138-3142
Author(s):  
Shi Jun Wang ◽  
Xue Sen Zhang ◽  
Chang Cheng Zhou ◽  
Jie Li ◽  
Jun Pan
Keyword(s):  
Melting Temperature ◽  
Influence Factors ◽  
Mean Value ◽  
Melting Properties ◽  
The Mean ◽  
Fluxing Agent ◽  
Addition Amount ◽  
Main Influence

Taken caustic calcined dolomite based compound desulfurizer as the research object, influence of fluxing agent CaF2, Al2O3, SiO2 and heating agent on the melting temperature of the compound desulfurizer was mainly investigated during its directly reducing process. Fluxing agent SiO2 and heating agent are the main influence factors, which influence melting temperature of the compound desulfurizer, the next are CaF2 and Al2O3. The mean value of compound desulfurizer melting temperature is respectively 1190.3°C and 1199Subscript text.1°C when the addition amount of SiO2 and heating agent is respectively 8.33% and 33.55%. With the increase of CaF2, the mean value of compound desulfurizer melting temperature decreases gradually, however, which increases first and then decreases with the increase of Al2O3.The conditions of the lowest melting temperature about the compound desulfurizer is A4, B1, C1, D2, namely 9% CaF2 + 0% Al2O3 + 8.33% SiO2 + 33.55% heating agent.

Compare the Fluxing Effect of Boron Sludge and CaF2 on CaO-Based Steelmaking Slag

2013 ◽  
Vol 575-576 ◽  
pp. 382-385
Author(s):  
Hong Ming Wang ◽  
Xiang Zhu ◽  
Gui Rong Li ◽  
Li Li Yang ◽  
Cong Xiang Peng ◽  
...  
Keyword(s):  
Melting Temperature ◽  
Slag System ◽  
Steelmaking Slag ◽  
Melting Temperatures ◽  
Fluxing Agent

To reduce the pollution caused by employing CaF2 as fluxing agent in metallurgical flux, boron sludge is used as fluxing agent to substitute for CaF2. The melting temperatures of CaO-SiO2-Fe2O3-boron sludge system were investigated. The melting temperature of CaO-SiO2-Fe2O3-boron sludge slag system is increased with the increase of ω (CaO)/ω (SiO2) at first, and then fluctuates at about 1430°C. Moreover, the melting temperature of CaO-SiO2-Fe2O3-boron sludge system is decreased with the increase of boron sludge content at first and then increased, 7% content of boron sludge has the best fluxing effect and the melting temperature is1445°C. As a conclusion, the fluxing effect of boron sludge is close to CaF2, boron sludge may be considered to substitute for CaF2.

Analysis of structures and melting properties of the 19-atom Ni–Co clusters

2014 ◽  
Vol 28 (25) ◽  
pp. 1450171 ◽  
Author(s):  
Shi-Wei Ren ◽  
Jing-Wei Sun ◽  
Yan-Zhong Hao
Keyword(s):  
Melting Temperature ◽  
Nickel Atom ◽  
Melting Temperatures ◽  
Pure Cobalt ◽  
Melting Phenomenon ◽  
Nickel Clusters ◽  
Melting Properties ◽  
Mixed Clusters ◽  
Dynamics Method ◽  
Cobalt And Nickel

In this paper, by using the classical molecular dynamics method and the GEAM potential, the geometric structure and the melting properties of the 19-atom Ni – Co clusters with different compositions are studied. It is found that all the clusters have the double icosahedron structures although some of the structures are slightly deformed. With the increase of the temperature, a pre-melting phenomenon is observed. The pre-melting temperatures of the pure cobalt and nickel clusters are very close. But on the whole, the pre-melting temperature decreases with the increase of the number of the nickel atom for the mixed clusters. The effects of the substitution atoms on the melting temperature of the clusters are similar to that on the pre-melting temperature although there are some oscillations in the decrease process. The mechanism of these findings are also investigated and analyzed.

Comparison of Effects of B2O3 and CaF2 on Metallurgical Properties of High Basicity CaO-Based Flux

2011 ◽  
Vol 311-313 ◽  
pp. 966-969
Author(s):  
Hong Ming Wang ◽  
Li Li Yang ◽  
Hua Zhu ◽  
Yong Qi Yan
Keyword(s):  
Melting Temperature ◽  
Inflection Point ◽  
Equal Mass ◽  
Temperature Curve ◽  
Point Temperature ◽  
Metallurgical Properties ◽  
High Basicity ◽  
Mass Ratios ◽  
Fluxing Agent ◽  
Better Than

B2O3 is employed as fluxing agent of high basicity CaO-based flux to substitute for CaF2. The effects of B2O3 and CaF2 on the metallurgy properties of CaO-based flux were investigated. The results indicate that the fluxing action of B2O3 is better than that of CaF2. For the high basicity CaO-based flux, when CaF2 is substituted with B2O3, the melting temperature can be decreased remarkably. Especially, when the mass ratios of CaO/SiO2 are in range of 5.25~8.0, the flux melting temperature is lower than 1300 °C. The inflection point temperature of flux viscosity-temperature curve is lowered remarkably when B2O3 is employed to substitute for CaF2. Meanwhile, the desulfurization capacity of flux can be improved markedly when CaF2 is substituted with equal mass of B2O3.

Effect of B2O3 Substituted for CaF2 as Fluxing Agent on Melting Temperature of Converter Slag

2012 ◽  
Vol 538-541 ◽  
pp. 2203-2206 ◽  
Author(s):  
Ting Wang Zhang ◽  
Hong Ming Wang ◽  
Gui Rong Li ◽  
Xun Yin Zhang
Keyword(s):  
Melting Temperature ◽  
Converter Slag ◽  
Sio2 Content ◽  
Fluxing Agent

B2O3 is used as fluxing agent of converter slag to substitute for CaF2 so as to reduce fluorine pollution and decrease the melting temperature. Hemisphere method is used to measure the melting temperature of samples. Effect of ω(CaO)/ω(SiO2), content of Fe2O3 and content of B2O3(CaF2) on the melting temperature of CaO-SiO2-F2O3-B2O3(CaF2) system have been studied. Results indicate that the melting temperature of samples are decreased when B2O3 substitute for CaF2 equally with equal ω(CaO)/ω(SiO2) and content of Fe2O3 [ω(CaO)/ω(SiO2)=1.5~5.0, Fe2O3=0~30%], the melting temperature of samples are decreased remarkably with the increase of content of B2O3 [ω(CaO)/ω(SiO2)= 2.5].

The Melting Temperature of CaO-(2CaO•SiO2)-B2O3-SiO2-(Al2O3) Slag System

2012 ◽  
Vol 217-219 ◽  
pp. 35-38 ◽  
Author(s):  
Hong Ming Wang ◽  
Pei Si Li ◽  
Gui Rong Li ◽  
Mian Zhang ◽  
Zhao Zhao ◽  
...  
Keyword(s):  
Melting Temperature ◽  
Slag System ◽  
Refining Process ◽  
Alumina Content ◽  
Melting Temperatures ◽  
High Basicity ◽  
Secondary Refining ◽  
Mass Ratios ◽  
Fluxing Agent

The melting temperatures of CaO-(2CaO•SiO2)-B2O3-SiO2-(Al2O3) slag system were investigated. The results indicate that B2O3 has significant fluxing effect on this slag system. When the content of B2O3 is about 10% in these slag system, the mass ratios of w(CaO)/w(SiO2) and (CaO)/w(Al2O3) can be controlled in the scope of 1.5-8.0, the melting temperature of slag is still lower than 1340°C, which is suitable for steelmaking and secondary refining process. As a conclusion, when 10% B2O3 is employed as fluxing agent, a kind of CaO-based slag system with ultra-high basicity, ultra-low alumina content as well as low melting temperature can be obtained.

Solidification Structure Characteristics and Mechanical Properties of (Ag-Cu28)-25Sn Alloy Ribbons Prepared by Melt Spinning Method

2011 ◽  
Vol 682 ◽  
pp. 75-79
Author(s):  
Liang Feng Li ◽  
Tai Qiu ◽  
Jian Yang ◽  
Yong Bao Feng
Keyword(s):  
Melting Temperature ◽  
Master Alloy ◽  
Melt Spinning ◽  
Alloy Ribbon ◽  
Solidification Structure ◽  
Induction Melting ◽  
Linear Speed ◽  
Granular Crystals ◽  
Melting Properties ◽  
Prepared Alloy

To obtain novel intermediate temperature alloy solders with melting temperature of 400~600°C, (Ag-Cu28)-25Sn alloy ribbons were prepared by high frequency induction melting and melt spinning at different quenching linear speed. The effect of the development of solidification structure on melting properties and microhardness of the ribbons were investigated. The XRD results show that the as-prepared alloy ribbons have the same phase composition as the master alloy, which consists of Ag4Sn and Cu3Sn. With the quenching linear speed increasing, the solidification structures are refined and change from dendritic crystals to uniform granular crystals. As the quenching linear speed increases up to 32.25m/s, the grain size of the alloy ribbon has a distribution ranging from submicron to about 2μm. The DSC results indicate that the melting properties of alloy ribbons strongly depend on the solidification structure, and the melting temperature of alloy ribbons decreases with the quenching linear speed increasing. The lowest liquidus points of the alloy ribbon prepared at linear speed of 32.25m/s are located at 473.6°C and 524.7°C, respectively. The refined solidification structure notably increases the microhardness of the alloy ribbons, and the largest hardness value of 396HV is obtained for the alloy ribbon prepared at linear speed of 32.25m/s, which increases 27.0% compared with the master alloy.

Compression dependence of the melting of elements

1992 ◽  
Vol 439 (1905) ◽  
pp. 177-187 ◽  
Keyword(s):  
Electronic Structure ◽  
Melting Temperature ◽  
Triple Point ◽  
Electronic Structures ◽  
Melting Process ◽  
Higher Order ◽  
Pressure Derivative ◽  
Melting Properties ◽  
Solid Liquid ◽  
Independent Parameters

In normal melting there is no significant change in the electronic structure, while in anomalous melting the crystal and liquid have different electronic structures. For those elements that melt normally at zero pressure, the pressure derivative of the melting temperature is shown to follow the normal melting rule. For Ar, Na, K and Hg, the normal melting properties continue to hold to high compression, and in Hg it appears that the strong higher-order correlations in the liquid are gradually weakened by compression. The normal melting process is described by two sets of nearly independent parameters: universal statistical factors, and factors depending on the interatomic forces. Anomalous melting is related to a compression induced solid-solid-liquid triple point, and Cs is observed to change from normal to anomalous as its first triple point is approached.

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