scholarly journals A SULPHIDE CAPACITY PREDICTION MODEL OF BLAST FURNACE SLAG

2021 ◽  
Vol 55 (5) ◽  
Author(s):  
Yongchun Guo ◽  
Shen Fengman ◽  
Haiyan Zheng ◽  
Shuo Wang ◽  
Xin Jiang ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Theoretical Model ◽  
Prediction Model ◽  
Linear Relationship ◽  
Blast Furnace Slag ◽  
Slag System ◽  
Good Linear ◽  
Coexistence Theory ◽  
Furnace Slag ◽  
Capacity Prediction

A sulphide capacity prediction model of CaO-SiO2-MgO-Al2O3 slags has been developed based on the ion and molecule coexistence theory(IMCT). Sulphide capacity(Cs) of slag for blast furnace (BF) with high Al2O3 in the CaO-SiO2-MgO-Al2O3 system at 1773K were measured by applying slag-metal equilibrium method. The feasibility of the developed IMCT model is verified by the sulphide capacity measured in the experiment. Effects of R(w(CaO)/w(SiO2)), w(MgO)/w(Al2O3) and w(Al2O3) on sulphide capacity were discussed. There is a good linear relationship between the experimental value and the predicted value. Therefore, the theoretical model of ion and molecule coexistence can be used to calculate the sulphide capacity of CaO-SiO2-MgO-Al2O3 quaternary slag system. When w(Al2O3)=20% and w(MgO)/w(Al2O3)=0.5, the sulphide capacity of slag increased with the increase of R. When w(Al2O3)=20% and R=1.30, the sulphide capacity of slag increased with the increase of w(MgO)/w(Al2O3). When R=1.30 and w(MgO)/w(Al2O3)=0.4, the sulphide capacity of slag decreased with the increase of w(Al2O3).

scholarly journals Comparative Study on Chloride Binding Capacity of Cement-Fly Ash System and Cement-Ground Granulated Blast Furnace Slag System with Diethanol-Isopropanolamine

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4103
Author(s):  
Huaqing Liu ◽  
Yan Zhang ◽  
Jialong Liu ◽  
Zixia Feng ◽  
Sen Kong
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Binding Capacity ◽  
Slag System ◽  
Chloride Binding ◽  
Chemical Binding ◽  
Granulated Blast Furnace Slag ◽  
Steel Bar ◽  
Furnace Slag

Steel bar corrosion caused by chloride was one of the main forms of concrete deterioration. The promotion of chloride binding capacity of cementitious materials would hinder the chloride transport to the surface of steel bar, thereby alleviating the corrosion and mitigating the deterioration. A comparative study on binding capacity of chloride in cement-fly ash system (C-FA) and cement-ground granulated blast furnace slag system (C-GGBS) with diethanol-isopropanolamine (DEIPA) was investigated in this study. Chloride ions was introduced by adding NaCl in paste, and the chloride binding capacity of the paste samples at 7 d and 60 d was examined. The hydration process was discussed via the testing of hydration heat and compressive strength. The hydrates in hardened paste was characterized by X-ray Diffractometry (XRD), Thermo Gravimetric Analysis (TGA), and Scanning Electron Microscope (SEM). The effect of DEIPA on dissolution of aluminate phase and compressive strength was discussed as well. These results showed that DEIPA could facilitate the hydration of C-FA and C-GGBS system, and the promotion effect was higher in C-FA than that in C-GGBS. DEIPA also increased the binding capacity of chloride in C-FA and C-GGBS systems. One reason was the increased chemical binding, because DEIPA facilitated the dissolution of aluminate to benefit the formation of Friedel’s salt. Other reasons were the increased physical binding and migration resistance. By contrast, DEIPA presented greater ability to increase chloride binding capacity in C-FA system, because DEIPA showed stronger ability to expedite the dissolution of aluminate of FA than that of GGBS, which benefited the formation of FS, thereby promoting the chemical binding. Such results would give deep insight into using DEIPA as an additive in cement-based materials.

scholarly journals Influence of B2O3and Basicity on Viscosity and Structure of Medium Titanium Bearing Blast Furnace Slag

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Lingtao Bian ◽  
Yanhong Gao
Keyword(s):  
Blast Furnace ◽  
Network Structure ◽  
Blast Furnace Slag ◽  
Slag System ◽  
Break Point ◽  
Slag Viscosity ◽  
X Ray Diffraction ◽  
Structure Variation ◽  
Point Temperature ◽  
Furnace Slag

The effects of B2O3and basicity (CaO/SiO2) on the viscous behavior and structure of medium titanium bearing blast furnace slag (MTBBFS) were investigated. High temperature viscosimeter was applied to measure the viscosities of CaO-SiO2-MgO-TiO2-Al2O3-B2O3slag system and X-ray diffraction (XRD), NBO/T ratio, and structure parameterQwere employed to analyze its network structure. The results showed that the viscosity decreased and break point temperature increased with increasing basicity to 1.20. However B2O3addition gave rise to a decrease in slag viscosity and break point temperature inspite of basicity. The more B2O3content leads to the more pronounced variation, especially for the slag with larger basicity. The conventional NBO/T formula was revised to predict the structure variation of relatively complicated medium Ti bearing slag based on the work of Yanhong Gao and other researchers. The increase of B2O3content in slag made parameterQturn fromQ2toQ1, suggesting that network structure became simpler. It was also noticed that the addition of B2O3could suppress the formation of perovskite.

Investigation on Blending CFB Ash with Blast Furnace Slag as Replacement for Portland Cement Used in Concrete Binders

2013 ◽  
Vol 723 ◽  
pp. 623-629 ◽  
Author(s):  
Guan Yu Chen ◽  
Wei Hsing Huang
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Petroleum Coke ◽  
Blast Furnace Slag ◽  
Circulating Fluidized Bed ◽  
Slag System ◽  
Ash Content ◽  
Chemical Compositions ◽  
Volume Stability ◽  
Furnace Slag

Circulating Fluidized Bed (CFB) Boiler is a means of energy-generating process by burning petroleum coke. In order to avoid blazed petroleum coke with high sulfur content from emitting overdosed sulfur dioxide, limestone is introduced in the boiler for desulfuration. The residue collected from the boiler is called CFB ash. In accordance with different boiler position, CFB ashes can be classified as fly ash and bed ash, and both have similar chemical compositions, with high contents of gypsum and calcium oxide. In this study, CFB ash (fly ash) is mixed with blast furnace slag (BFS) as a substitute for cement in making concrete. It is intended that CFB ashes can be used in concrete and a method for proportioning CFB ash in concrete can be developed. The results show that CFB ash can react with cement to produce hydration products such as Ca(OH)2, and bring the activation of blast furnace slag. The paste strength could be low at later ages, if the CFB ash content is too low. Whereas, if the CFB ash content is over 30%, the paste strength will be low at the early age. Therefore, it is concluded that the cement-granulated blast furnace slag system will show best performance at the CFB ash content between 18% and 22%. In autoclave soundness test shows the CFB ash of the high f-CaO content is easy reaction in the water, and also did not negatively affect the quality of the volume stability.

Study on desulfurization capacity of high alumina blast furnace slag at 1773 K using slag-metal equilibrium technique

2018 ◽  
Vol 115 (5) ◽  
pp. 502
Author(s):  
Trinath Talapaneni ◽  
Natraj Yedla ◽  
Smarajit Sarkar
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Slag System ◽  
Partition Ratio ◽  
High Alumina ◽  
Content Increase ◽  
X Ray ◽  
Bridge Oxygen ◽  
Experimental Values ◽  
Furnace Slag

In the current paper, we have determined the desulfurization ability of a CaO–MgO–SiO2–Al2O3 slag system using slag-metal equilibrium technique. The chemical composition of slag samples consists of Al2O3 in the range of 25–30 wt%, CaO/SiO2 ratio (0.8–1.6) and MgO (8–16 wt%). All the experiments are conducted at a temperature of 1773 K. The sulphur content in the slag as well as in metal after desulfurization reaction is analyzed using XRF (X-ray Fluorescence Spectroscopy) for calculating sulphur partition ratio (LS) of the slags. The influence of Al2O3, CaO/SiO2 ratio and MgO content on LS have been studied. It is observed that LS increase with an increase in CaO/SiO2 ratio and MgO content, but it reduces as the Al2O3 content increase in slag. Also, the amount of bridge oxygen ([BO]) represented by (O0) decreases with increase in basicity and MgO content. However, O0 increases with increase in Al2O3. It is witnessed that the experimental values closely fit with the values obtained from corrected optical basicity model.

A Prediction Model of Blast Furnace Slag Viscosity Based on Principal Component Analysis and K-Nearest Neighbor Regression

JOM ◽  
2020 ◽  
Vol 72 (11) ◽  
pp. 3908-3916
Author(s):  
Dewen Jiang ◽  
Jianliang Zhang ◽  
Zhenyang Wang ◽  
Chenfan Feng ◽  
Kexin Jiao ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Blast Furnace ◽  
Prediction Model ◽  
Blast Furnace Slag ◽  
Nearest Neighbor ◽  
Principal Component ◽  
Component Analysis ◽  
Slag Viscosity ◽  
K Nearest Neighbor ◽  
Furnace Slag
Sign in / Sign up

Export Citation Format

Share Document