scholarly journals Effect of Erosion Behavior of FeO-CaO-SiO2-MgO-Al2O3 Blast Furnace Primary Slag on Al2O3 Substrate

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 957
Author(s):  
Xiangyang Pan ◽  
Fengman Shen ◽  
Qiangjian Gao ◽  
Xin Jiang ◽  
Haiyan Zheng
Keyword(s):  
Blast Furnace ◽  
Molten Slag ◽  
Interface Layer ◽  
Negative Influence ◽  
Contact Angles ◽  
Al2o3 Substrate ◽  
Iron And Steel ◽  
Erosion Behavior ◽  
Good Surface ◽  
Angle Method

Al2O3 substrate is widely used as a lining refractory material throughout the blast furnace (BF) process. Accordingly, the erosion of Al2O3 refractory by molten slag has a negative influence on the running cost and smooth operation of BFs. The effect of the erosion behavior of BF primary slag containing FeO-CaO-SiO2-MgO-Al2O3 on Al2O3 substrate refractory was fundamentally investigated using the high-temperature contact angle method and FactSage thermodynamic software based on the composition of BF primary slag in a typical iron and steel enterprise of China. The results showed that the primary slag mentioned above was easily wetted with Al2O3 substrate, and the observed contact angles were 24.5° and 22.0°, when the FeO mass fraction (w(FeO)) was maintained at 10% and 15% of the primary slag, respectively. Moreover, the starting melting temperature of the primary slag with high FeO content, of 1263 °C, was lower. The erosion thickness between the slag and Al2O3 substrate increased from 19.23 to 23.17 μm as the added w(FeO) increased from 10% to 15%. In addition, it was observed via SEM-EDS analysis that the interface layer was formed, and high-melting-point compounds were generated during the wetting process. This was attributed to the interaction between the molten slag and Al2O3 existing in the substrate, which may have inhibited the continuous dissolution of the Al2O3 in the substrate into slag. Good surface wettability and the dissolution of the Al2O3 substrate refractory into the primary slag of the BF are two dominant factors leading to the erosion of the refractory.

scholarly journals Optimization of heat treatment of glass-ceramics made from blast furnace slag

2020 ◽  
Vol 39 (1) ◽  
pp. 539-544
Author(s):  
Yi-Ci Wang ◽  
Pei-Jun Liu ◽  
Guo-Ping Luo ◽  
Zhe Liu ◽  
Peng-Fei Cao
Keyword(s):  
Heat Treatment ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Orthogonal Experiment ◽  
Glass Ceramics ◽  
Iron And Steel ◽  
Heat Treatment Regime ◽  
Main Crystalline Phase ◽  
Optimum Heat ◽  
Furnace Slag

AbstractCaO–MgO–Al2O3–SiO2 glass-ceramics with diopside as the main crystalline phase were prepared by melting blast furnace slag obtained from Baotou Iron and Steel Company. The effect of heat treatment on the crystallization behavior of glass-ceramics, containing a large proportion of melted blast furnace slag, was studied by means of differential thermal analysis and scanning electron microscopy. The optimum heat-treatment regime was obtained by orthogonal experimental results for glass-ceramics in which blast furnace slag comprised 70% of the composition and 1% Cr2O3 and 4% TiO2 were used as nucleating agents. The nucleation temperature was 750°C for 2.5 h and the crystallization temperature was 930°C for 1 h. Under this regime, the performance of the glass-ceramic was better than that of other groups in the orthogonal experiment.

Cognition on the Molten Blast Furnace Slag Granulation Techniques in Contemporary China

2013 ◽  
Vol 634-638 ◽  
pp. 3118-3122
Author(s):  
Lin Li ◽  
Guang Xiao Ma ◽  
Dai Jun Wang ◽  
Ruo Yu Zang ◽  
Yong Qi Li
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Molten Slag ◽  
Waste Heat ◽  
Water System ◽  
Contemporary China ◽  
Bf Slag ◽  
Design Ideas ◽  
Furnace Slag ◽  
Slag Granulation

Introduce characters and applications of granulation techniques of the molten blast furnace slag in contemporary China, describe characters and design ideas of two types of granulation boxes, represent three types of circulating granulation water systems, put forward matching proposal between the molten slag granulation system and the circulating granulation water system, analyze contemporary research and problems of waste heat recovery of the molten BF slag.

MULTISCALE AND FRACTAL ANALYSIS OF SILICON CONTENT TIME SERIES OBSERVED IN BLAST FURNACE HOT METAL USING HURST EXPONENT CHAIN

Fractals ◽  
2015 ◽  
Vol 23 (04) ◽  
pp. 1550036 ◽  
Author(s):  
SHIHUA LUO ◽  
FAN GUO ◽  
DEJIAN LAI ◽  
FANG YAN ◽  
FEILAI TANG
Keyword(s):  
Time Series ◽  
Blast Furnace ◽  
Negative Correlation ◽  
Hurst Exponent ◽  
Silicon Content ◽  
Coarse Grained ◽  
Fluctuation Analysis ◽  
Hot Metal ◽  
Iron And Steel ◽  
Generalized Hurst Exponent

Hurst exponent is an important measure of nonlinearity of dynamical time series. In this paper, using rescaled-range ([Formula: see text]/[Formula: see text]) analysis, multi-fractal detrended fluctuation analysis (MF-DFA) methods, the multiscale Hurst exponent (MHE) and the multiscale generalized Hurst exponent (MGHE) of coarse-grained silicon content ([Si]) time series in blast furnace (BF) hot metal were calculated. First, we collected these [Si] time series from No. 1 BF of Nanchang Iron and Steel Co. and No. 10 BF of Xinyu Iron and Steel Co. in Jiangxi Province, China. Then, we analyzed and compared the estimated Hurst exponents and the generalized Hurst exponent of these observed time series with some simulated time series. Our results show that the observed time series from these BFs have negative correlation with the Hurst exponent less than 0.5, the generalized Hurst exponent [Formula: see text] is a nonlinear function of [Formula: see text], and such negative correlation and local various structure persist in their moving averages of the observed time series up to lag 5 or 10.

Experimental Study on Zinc Leaching of Blast Furnace Gas Ash by Ammonia Leaching

2014 ◽  
Vol 962-965 ◽  
pp. 780-783
Author(s):  
Jie Wang ◽  
Wei Xiong ◽  
Bao Ping Zhang
Keyword(s):  
Blast Furnace ◽  
Removal Rate ◽  
Influence Factors ◽  
Environmental Benefits ◽  
Main Task ◽  
Leaching Rate ◽  
Iron And Steel ◽  
Leaching Process ◽  
Blast Furnace Gas ◽  
Ammonia Leaching

Blast furnace gas ash is one of the main solid wastes in iron and steel enterprise. The recovery of zinc from gas ash can result in considerable economic and environmental benefits. The effect of NH3/NH4+, L/S, [NH3]T and leaching time on the zinc leaching rate of blast furnace gas ash by using ammonia leaching process had been investigated in this paper. The results show that L/S and NH3/NH4+ are the main influence factors under the experimental condition. The optimal conditions for leaching process are: NH3/NH4+=2:1, L/S=4:1, [NH3]T =5mol/L, and the leaching time is 3 hours. The zinc leaching rate is 82.84% under the optimized conditions. The lead content in leaching solution is high, so the main task is to improve the removal rate of lead in the purification process.

Beneficiability Study of the Blast Furance Dust from Tangshan Iron and Steel Company

2013 ◽  
Vol 712-715 ◽  
pp. 420-423 ◽  
Author(s):  
Jin Xia Zhang ◽  
Fu Sheng Niu ◽  
Li Li ◽  
Jun Xie
Keyword(s):  
Blast Furnace ◽  
Laboratory Test ◽  
Recovery Rate ◽  
Test Results ◽  
Steel Company ◽  
Iron And Steel ◽  
Expected Effect ◽  
Blast Furnace Dust ◽  
Iron Concentrate ◽  
Laboratory Test Results

Through the analysis and study the properties, characteristics and present conditions of the flue slime of blast furnace dust, a suggestion was made of recovering carbon and iron concentrate from the blast furnace dust using a beneficiation technology consisting of gravity separation-flotation. The laboratory test results indicated that it can obtain the iron/carbon concentrate with a grade of iron 53.41%, carbon 65.21% at a recovery rate of iron 51.33%, carbon 69.29%. This mineral processing technology achieved good technical and economical results, reaching the expected effect. The technology can be applied in production and popularized.

Carbothermic Reduction of Titanium-Bearing Blast Furnace Slag

2016 ◽  
Vol 35 (3) ◽  
pp. 309-319 ◽  
Author(s):  
Yu-Lan Zhen ◽  
Guo-Hua Zhang ◽  
Kuo-Chih Chou
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Carbothermic Reduction ◽  
Treatment Time ◽  
Reduction Rate ◽  
Isothermal Treatment ◽  
Reduction Temperature ◽  
X Ray Diffraction ◽  
Iron And Steel ◽  
Furnace Slag

AbstractThe carbothermic reduction experiments were carried out for titanium-bearing blast furnace slag in Panzhihua Iron and Steel Company in argon atmosphere at high temperatures. The effects of reduction temperature, isothermal treatment time and carbon content on the formation of TiC were studied by X-ray diffraction (XRD) and scanning electron microscope (SEM). The XRD pattern results showed that MgAl2O4 phase disappeared and the main phase of the reduced sample was TiC when the reduction temperature was higher than 1,773 K. The SEM pictures showed that the reduction rate of the titanium-bearing blast furnace slag could be increased by enhancing the temperature and the C content (carbon ratio ≤1.0). Furthermore, it was also found that TiC had the tendency of concentrating around the iron. The effects of additives such as Fe and CaCl2 on the formation of TiC were also studied in the present study.

The Technical Analysis of Energy Saving and Emission Reducing in China’s Iron and Steel Industry Based on LEAP Mode

2013 ◽  
Vol 634-638 ◽  
pp. 3163-3169
Author(s):  
Bao Qing Wang ◽  
Lei Zhang ◽  
De Qing Wang ◽  
Shuai Yin ◽  
Shu Yao
Keyword(s):  
Blast Furnace ◽  
Energy Saving ◽  
Steel Industry ◽  
Energy Demand ◽  
Co2 Reduction ◽  
Initial Energy ◽  
Planning System ◽  
Iron And Steel Industry ◽  
Iron And Steel ◽  
Reduction Potentials

To assess some technologies which are more appropriate for the development of the iron and steel industry in China, a model was developed based on the Long range Energy Alternatives Planning System (LEAP) to assess the energy saving and CO2 reduction potentials from 2010 to 2040. The results show that the top three saving energy potentials is non-blast furnace iron-making accounted for 6.85%, device enlargement for 5.85%, advanced blast furnace for 4.84%, and also show that the top three CO2 reduction potentials is device enlargement accounted for 11.7%, non-blast furnace iron-making for 6.21%, advanced coke and blast furnace 5.52%. In the Mitigation scenario, it can reduce 28% of the initial energy demand and 35.2% of CO2 emissions. It can provide a method and data for search energy saving and CO2 reduction potentials in iron and steel industry by LEAP model.

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