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.

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 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.

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.

Effect of Anhydrite on the Hydration of Calcium Oxide-Activated Ground Granulated Blast Furnace Slag Binders

2017 ◽  
Vol 9 (12) ◽  
pp. 2214-2222 ◽  
Author(s):  
Junxiang Wang ◽  
Xianjun Lyu ◽  
Lingyun Wang ◽  
Xiaoqiang Cao ◽  
Haoyu Zang ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Calcium Oxide ◽  
Blast Furnace Slag ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

A direct conversion of blast furnace slag to a mesoporous silica–calcium oxide composite and its application in CO2 captures

2020 ◽  
Vol 22 (12) ◽  
pp. 3759-3768
Author(s):  
Yasutaka Kuwahara ◽  
Aiko Hanaki ◽  
Hiromi Yamashita
Keyword(s):  
Blast Furnace ◽  
Mesoporous Silica ◽  
Calcium Oxide ◽  
Blast Furnace Slag ◽  
Cost Effective ◽  
Direct Conversion ◽  
Oxide Composite ◽  
Adsorption Performance ◽  
Cost Effective Approach ◽  
Furnace Slag

A facile and cost-effective approach is presented that converts blast furnace slag into a mesoporous silica-CaO composite possessing high CO2 adsorption performance.

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

scholarly journals STUDY OF SOLIDIFYING MIXTURES IN MINING KRYVYI RIH IRON ORE DEPOSIT “KIROV”

2021 ◽  
Author(s):  
Serhii Pysmennyi ◽  
◽  
Valerii Pozdniakov ◽  
Victoria Biluk ◽  
◽  
...  
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Iron Ore ◽  
Temperature Fluctuations ◽  
Iron Ores ◽  
Ore Deposit ◽  
Labour Costs ◽  
Iron Ore Deposit ◽  
Technical And Economic Indicators ◽  
Furnace Slag

The work addresses the issue of selecting a solidifying mixture when mining deposits of naturally lean iron ores by open stoping systems to decrease mining costs without the concern for surface subsidence. Magnetite quartzites are mined by systems applied to mining naturally rich iron ores that provide for leaving significant reserves in pillars. In view of the above, when mining magnetite quartzites, it is reasonable to consider application of open stoping with backfilling. Application of polymer additives in the backfill instead of cement allows decreasing costs for water and binders while retaining its strength. As they are able to couple with any binders and fillers, polymers can be added to not only concretes and cement grouts. This provides opportunities to widely use mining and concentrating wastes, i.e. slag and waste rock. Advantages of applying mixtures with plasticizers are: lower labour costs, reduced risks of cracking, increased abrasion resistance, lower shrinkage, increased resistance to temperature fluctuations, backfilling without vibrations, a longer concrete mixture lifecycle. Aggregate technical and economic indicators demonstrate that with similar physical properties of the backfill, polymer-based backfilling is 2-3 times cheaper as compared with the cement-based one. Thus, when stoping with backfilling at Artem underground mine, it is advisable to use a polymer blast furnace slag backfill as a solidifying mixture.

Ceramics composites from iron ore tailings and blast furnace slag

2021 ◽  
Author(s):  
Luana Cechin ◽  
Vsévolod Mymrine ◽  
Monica A. Avanci ◽  
Ana Paula Povaluk
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Iron Ore ◽  
Iron Ore Tailings ◽  
Furnace Slag
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