scholarly journals Proper MgO/Al2O3 Ratio in Blast-Furnace Slag: Analysis of Proper MgO/Al2O3 Ratio Based on Observed Data

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 784
Author(s):  
Fengman Shen ◽  
Xinguang Hu ◽  
Haiyan Zheng ◽  
Xin Jiang ◽  
Qiangjian Gao ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Iron Ore ◽  
Social Benefits ◽  
Blast Furnaces ◽  
High Quality ◽  
Diagram Analysis ◽  
Furnace Slag

With the gradual depletion of high-quality iron-ore resources, ironmaking blast furnaces have gradually shifted to using high-content Al2O3 iron ore. Under this condition, the addition of MgO in the slag is adopted to alleviate operation problems caused by the high content of Al2O3. However, the proper value of the MgO/Al2O3 ratio for blast-furnace slag systems (Al2O3 = 8–25%) is not systematically studied. In this paper, we discuss the proper MgO/Al2O3 ratio on the basis of blast-furnace slag systems under different Al2O3 contents. On the basis of thermodynamics and phase-diagram analysis, it could be concluded that: (1) the MgO/Al2O3 ratio is not limited when Al2O3 in slag is less than 14%, (2) the MgO/Al2O3 ratio is required to be in the range of 0.40–0.50 when Al2O3 in the slag is 15–17%, and (3) the MgO/Al2O3 ratio should be 0.45–0.55 when Al2O3 in the slag is larger than 18%. The proper MgO/Al2O3 ratio value has been established in various industries, and it has achieved significant economic and social benefits.

Effect of melt structure property on Al2O3 activity in CaO-SiO2-Al2O3-MgO system for blast furnace slag with different Al2O3 content

2021 ◽  
Vol 118 (5) ◽  
pp. 515
Author(s):  
Xinguang Hu ◽  
Fengman Shen ◽  
Haiyan Zheng ◽  
Yongchun Guo ◽  
Xin Jiang ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Iron Ore ◽  
Low Cost ◽  
Al2o3 Content ◽  
Structure Property ◽  
High Quality ◽  
Melt Structure ◽  
Spectra Analysis ◽  
Furnace Slag

With the shortage of high-quality iron ore resources, more and more attention has been paid to the blast furnace (BF) smelting of Al2O3-rich iron ore in recent years. Thus, investigation on the thermodynamics property of Al2O3-rich blast furnace slag was inevitable in order to produce high quality hot metal with low cost. In this paper, based on the determination of Al2O3 activity by reference slag method at 1873 K in previous study, the effect of the mechanism of slag structure property on Al2O3 activity in CaO-SiO2-MgO-Al2O3 system was discussed by Raman spectra analysis. It was found that the [AlO4] structure was polymerized and [SiO4] structure was depolymerized with the Al2O3 content increasing from 10 wt.% to 18 wt.%, which caused the Al2O3 activity increased.

Phosphorus retention capacity of iron-ore and blast furnace slag in subsurface flow constructed wetlands

2001 ◽  
Vol 44 (11-12) ◽  
pp. 69-75 ◽  
Author(s):  
B. Grüneberg ◽  
J. Kern
Keyword(s):  
Blast Furnace ◽  
Constructed Wetlands ◽  
Blast Furnace Slag ◽  
Iron Ore ◽  
Subsurface Flow ◽  
Phosphorus Retention ◽  
Anaerobic Conditions ◽  
Retention Capacity ◽  
Aerobic Conditions ◽  
Furnace Slag

The suitability of iron-ore and blast furnace slag for subsurface flow (SSF) constructed wetlands was studied over a period of four months. Dairy farm wastewater (TP 45 mg l-1) was percolated through buckets planted with reed (volume 9.1 l; hydraulic load 15 l m-2d-1). One group of buckets was kept under aerobic conditions and the other group under anaerobic conditions, monitored by continuous redox potential measurements. Even at high mass loading rates of 0.65 g P m-1d-1 the slag provided 98% removal efficiency and showed no decrease in performance with time. However, phosphorus fractionation data indicate that the high phosphorus retention capacity under aerobic conditions is to a great extent attributable to unstable sorption onto calcium compounds (NH4Cl-P). Phosphorus sorption of both the slag (200 μg P g-1) and the iron-ore (140 μg P g-1) was promoted by predominantly anaerobic conditions due to continuous formation of amorphous ferrous hydroxides. None of the substrates had adverse affects on reed growth.

scholarly journals Prediction of the properties of blast furnace slag in modern conditions of blast furnaces of Ukraine

2018 ◽  
pp. 118-136
Author(s):  
D.N. Togobitskaya ◽  
A.I. Belkova ◽  
D.A. Stepanenko ◽  
N.A. Tsyupa ◽  
Yu.M. Likhachev
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Rapid Assessment ◽  
Operating Conditions ◽  
Integral Parameter ◽  
Blast Furnaces ◽  
Magnesia Content ◽  
The Individual ◽  
Management Recommendations ◽  
Furnace Slag

The aim of the work is the development of models for predicting the properties of final blast-furnace slags for the rapid assessment of the slag regime and the development of sound management recommendations when using various additives in the operating conditions of blast furnaces in Ukraine. A two-stage approach to calculating the properties of blast-furnace slag is proposed: according to the model of a “homogeneous” melt and taking into account its heterogeneity. A predictive model has been developed for calculating the viscosity of a «homogeneous» slag by including the integral parameter of the slag melt parameter e in the model structure, which takes into account the individual effect on the viscosity of each component of the slag composition. The current production data of the chemical composition of the final slag shows the effect of the magnesia content, alkaline compounds, basicity, Al2O3/MgO ratio on the calculated viscosity of the slags. For various operating conditions of blast furnaces, it has been shown that, due to incomplete combustion of coke and pulverized coal, the viscosity of slags increases by 1.5–2 times and their melting temperatures by 30–500C. Comparative analysis of the calculated properties of slag for different operating conditions of 3 furnaces in Ukraine confirms the appropriateness of using a complex of predictive models for the rapid assessment of the technological properties of slag, which makes it possible to choose a rational slag mode in modern conditions of blast smelting.

IX.—On a Curious Blast Furnace Slag

1877 ◽  
Vol 1 (7) ◽  
pp. 241-242
Author(s):  
J. B. Hannay
Keyword(s):  
Blast Furnace ◽  
Metallic Iron ◽  
Blast Furnace Slag ◽  
Blast Furnaces ◽  
The Matrix ◽  
Cursory Examination ◽  
Furnace Slag

One of the blast furnaces at the the Eglinton Iron Works, Kilwinning, having been blown out, it was noticed that on the hearth there was a curious deposit of a bluish black semi-metallic colour, which by its brittleness seemed to be a slag. Mr. Smith having forwarded to my friend Mr. John Young, F.G.S, a sample of the substance, it was submitted to me for analysis and examination. On a cursory examination it was seen that it was not homogeneous but consisted of different substances mixed, the most conspicuous being the bluish substance with a plumbago lustre before referred to. On powdering it the substance was round to contain pieces of metallic iron in irregular masses inbedded in the matrix.

Probing of Iron Ore “Plus Calcium Oxide Grade"

2010 ◽  
Vol 160-162 ◽  
pp. 1253-1256
Author(s):  
Zhi Xia Zhang ◽  
Hai Sheng Yin
Keyword(s):  
Blast Furnace ◽  
Calcium Oxide ◽  
Blast Furnace Slag ◽  
Iron Ore ◽  
Mass Percentage ◽  
Iron Concentrate ◽  
Oxide Addition ◽  
Furnace Slag

A new concept, “Plus Calcium Oxide Grade”, was put forward, which is the very mass percentage of iron element when Calcium Oxide addition fulfills the need of the basicity of the blast furnace slag. The “Plus Calcium Oxide Grade” and “Minus Calcium Oxide Grade” of iron ore, iron concentrate, sinter and pellet was calculated, analyzed and also compared. The results showed that: the Plus Calcium Oxide Grade can reflect the smelting value more objectively and reasonably, while the basic grade and “Minus Calcium Oxide Grade” can not. So it is suggested that the concept of “Plus Calcium Oxide Grade” can be brought into the iron ore dealing and using, and also into the area of iron concentrate, sinter, pellet and furnace mixture.

Study on the Modification of Blast Furnace Smelt Slag and Crystallization Behavior in the Solidification Process

2015 ◽  
Vol 1094 ◽  
pp. 352-359 ◽  
Author(s):  
Jie Li ◽  
Kai Zhao ◽  
Yu Zhu Zhang ◽  
Wei Xing Liu ◽  
Ai Min Yang
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Iron Ore ◽  
Crystallization Behavior ◽  
Vitreous Body ◽  
Solidification Process ◽  
Waste Rock ◽  
Furnace Slag ◽  
Air Hole

The direct fibrillation of blast furnace slag can solve these problems, such as having not been recycled of sensible heat, the consumption of water resources, environmental pollution and the low additional value of product, which are caused by the traditional water quenching method. The modification is the key problem of fiber forming. The thesis mainly aims at the study of viscosity of slag, the ability of crystallization and mineral phase structure after the modified process of blast furnace slag and confined the relevance of the three to optimize the appropriate texturizer and adding ratio. The results are as following: Iron ore waste rock, fly-ash and compounded texturizer can improve the high temperature viscosity of the slag respectively, while it has different effect on landing gradient of viscosity and temperature (Fly-ash occupies first place, compounded texturizer comes second and iron ore and waste rock comes the minimum). By analyzing the crystallization behavior of the slag in the solidification process, when the proportion of iron ore waste rock is more than 9%, the fly-ash is equal or greater than 8% and the compounded texturizer is more than 9%, the solidification slag will appear amorphous. The mineral composition of the slag transforms gradually from melilite to vitreous body, which will make the air hole of the vitreous body increased and aperture decreased. When the iron ore waste rock is added, the homogeneity of the air hole will deteriorate, while adding the fly-ash and compounded texturizer will strengthen the homogeneity of the air hole and make the mineral structure intensive gradually.

Crystallization behavior of blast furnace slag modified by adding iron ore tailing

2017 ◽  
Vol 24 (6) ◽  
pp. 601-607 ◽  
Author(s):  
Qian-qian Ren ◽  
Yu-zhu Zhang ◽  
Yue Long ◽  
Shao-sheng Chen ◽  
Zong-shu Zou ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Iron Ore ◽  
Crystallization Behavior ◽  
Iron Ore Tailing ◽  
Furnace Slag

Study on Production of Burning-Free Brick Using Chinese Kuancheng Iron Ore Tailings

2012 ◽  
Vol 511 ◽  
pp. 146-149 ◽  
Author(s):  
Xiao Yu Zhou ◽  
Yi Zhong Yu ◽  
Shao Xian He ◽  
Qing Li
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Iron Ore ◽  
Raw Material ◽  
Iron Ore Tailings ◽  
Iron Ore Tailing ◽  
And Performance ◽  
Optimum Formula ◽  
Furnace Slag

Based on the analysis of components of Chinese Kuancheng iron ore tailings, burning-free brick test block were produced using local iron ore tailings and blast furnace slag as raw material, portlant cement as mineral glue, and parget as mineral activator. The optimum formula and production process were obtained with experiment of compressive strength of test blocks. The optimum ratio of iron ore tailing to blast furnace slag is between 5:5 and 6:4, parget composition is between 6% and 8%, and cement usage can be reduced to 10%. After curing, burning-free brick compressive strength of 17.5Mpa can be reached without sandiness phenomenon, and performance far exceeds the M10 burning-free brick standards. The formula of burning-free brick proposed in this paper can solve the problem of mineral waste pollution in Kuancheng area

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