Combining Recovering Iron with Activating the Residual Slag Process for Electric Arc Furnace (EAF) Slag

2013 ◽  
Vol 275-277 ◽  
pp. 2206-2209
Author(s):  
Zhi Wei Liu ◽  
Yu Li ◽  
Da Qiang Cang ◽  
Yi Chen ◽  
Shuai Jiang ◽  
...  
Keyword(s):  
Steel Slag ◽  
First Grade ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
National Standard ◽  
Arc Furnace ◽  
Iron Concentrate ◽  
Slag Powder ◽  
Activating Agent ◽  
Eaf Slag

Electric arc furnace (EAF) slag is the byproduct of electric arc furnace in the process of metallurgy. In this paper, a recovering iron process combined with an activating residual slag process for EAF slag has been put forward. Researches show that increasing fineness of EAF slag is adverse to recover iron from the slag and 21.27% of the EAF slag could be separated as recovered iron concentrate with grade of 64.34%. The residual slag after magnetic separation process could be activated through mixing activating agent. Hemihydrates gypsum was the best activating agent to improve reactivity of the residual slag, which could meet the requirement of the first grade of steel slag powder in national standard. Then residual slag cements had been successfully prepared with 30% of activated residual slag and a 28-day compressive strength of 44.46MPa.

scholarly journals Chemical Composition, pH Value, and Points of Zero Charge of High Calcium and High Iron Electric Arc Furnace Slag

2018 ◽  
Vol 7 (3.23) ◽  
pp. 1 ◽  
Author(s):  
Siti Zu Nurain Ahmad ◽  
Hamdan R ◽  
Wan Afnizan Wan Mohamed ◽  
N Othman ◽  
Nur Shaylinda Mohd Zin
Keyword(s):  
Chemical Composition ◽  
Calcium Oxide ◽  
Ferric Oxide ◽  
Ph Value ◽  
Steel Slag ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Arc Furnace ◽  
High Calcium ◽  
Eaf Slag

Electric arc furnace (EAF) slag as filter media has been extensively used nowadays for wastewater treatment technology. Steel slag was produced as byproduct from steelmaking processes. However, different batches of steel slag production produce different composition. Thus, this study determined the chemical composition, pH value and points of zero charge (PZC) of two different samples of electric arc furnace (EAF) slag; high iron EAF slag (Slag HFe) and high calcium EAF slag (Slag HCa). The steel slag were characterized using X-ray Fluorescence Spectroscopy (XRF) analysis for the chemical composition, extraction with boiling water for pH value, and salt addition method for PZC. Slag HFe was mainly consisted of 38.2% ferric oxide and 20.4% calcium oxide, 10.20 pH value and pH 10.55 for PZC. While for Slag HCa, they were composed of 1.64% ferric oxide and 49.5% calcium oxide of pH value of 11.11 and pH 11.75 for PZC. Therefore, Slag HCa was considered as a more basic species compared to Slag HFe. 

scholarly journals Assessment of Electric Arc Furnace (EAF) Steel Slag Waste’s Recycling Options into Value Added Green Products: A Review

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1347 ◽  
Author(s):  
Pao Ter Teo ◽  
Siti Koriah Zakaria ◽  
Siti Zuliana Salleh ◽  
Mustaffa Ali Azhar Taib ◽  
Nurulakmal Mohd Sharif ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Steel Slag ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Raw Material ◽  
Added Value ◽  
Arc Furnace ◽  
Separation Techniques ◽  
Eaf Slag ◽  
Physical And Chemical

Steel slag is one of the most common waste products from the steelmaking industry. Conventional methods of slag disposal can cause negative impacts on humans and the environment. In this paper, the process of steel and steel slag production, physical and chemical properties, and potential options of slag recycling were reviewed. Since steel is mainly produced through an electric arc furnace (EAF) in Malaysia, most of the recycling options reviewed in this paper focused on EAF slag and the strengths and weaknesses of each recycle option were outlined. Based on the reports from previous studies, it was found that only a portion of EAF slag is recycled into more straightforward, but lower added value applications such as aggregates for the construction industry and filter/absorber for wastewater treatments. On the other hand, higher added value recycling options for EAF slag that are more complicated such as incorporated as raw material for Portland cement and ceramic building materials remain at the laboratory testing stage. The main hurdle preventing EAF slag from being incorporated as a raw material for higher added value industrial applications is its inconsistent chemical composition. The chemical composition of EAF slag can vary based on the scrap metal used for steel production. For this, mineral separation techniques can be introduced to classify the EAF slag base on its physical and chemical compositions. We concluded that future research on recycling EAF slag should focus on separation techniques that diversify the recycling options for EAF slag, thereby increasing the waste product’s recycling rate.

Pilot-Scale Reconstruction of Steel Slag with Electric Arc Furnace Slag and Coal Cinder

2011 ◽  
Vol 287-290 ◽  
pp. 906-909 ◽  
Author(s):  
Zai Bo Li ◽  
San Yin Zhao ◽  
Xu Guang Zhao ◽  
Tu Sheng He
Keyword(s):  
Steel Slag ◽  
First Grade ◽  
Pilot Scale ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
National Standards ◽  
Reconstruction Technique ◽  
Arc Furnace ◽  
Electric Arc Furnace Slag ◽  
Furnace Slag

To realize the industrial application of online reconstruction technique of steel slag, a pilot-scale reconstruction research of steel slag (SS) with electric arc furnace slag (EAFS) and coal cinder (CC) and its mechanism were investigated. The results show that after reconstruction, the free-CaO content of reconstructed steel slag (RSS) is reduced. XRD analysis indicates that the reconstruction reaction can promote to create more active cementitious minerals (C2S, C3S, C6AF2 and C6A2F) in RSS. Composition adjusting materials formula composing of EAFS and CC at the ratio of 70:30 is optimum, which can meet the standard of the first grade steel slag powder according to Chinese National Standards GB/T 20491-2006.

scholarly journals High Performance Self-Compacting Concrete with Electric Arc Furnace Slag Aggregate and Cupola Slag Powder

2020 ◽  
Vol 10 (3) ◽  
pp. 773 ◽  
Author(s):  
Israel Sosa ◽  
Carlos Thomas ◽  
Juan Antonio Polanco ◽  
Jesus Setién ◽  
Pablo Tamayo
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Steel Slag ◽  
Cementitious Materials ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
High Density ◽  
Supplementary Cementitious Materials ◽  
Arc Furnace ◽  
Slag Powder

The development of self-compacting concretes with electric arc furnace slags is a novelty in the field of materials and the production of high-performance concretes with these characteristics is a further achievement. To obtain these high-strength, low-permeability concretes, steel slag aggregates and cupola slag powder are used. To prove the effectiveness of these concretes, they are compared with control concretes that use diabase aggregates, fly ash, and limestone supplementary cementitious materials (SCMs, also called fillers) and intermediate mix proportions. The high density SCMs give the fresh concrete self-compacting thixotropy using high-density aggregates with no segregation. Moreover, the temporal evolution of the mechanical properties of mortars and concretes shows pozzolanic reactions for the cupola slag. The fulfillment of the demands in terms of stability, flowability, and mechanical properties required for this type of concrete, and the savings of natural resources derived from the valorization of waste, make these sustainable concretes a viable option for countless applications in civil engineering.

scholarly journals Application of General Full Factorial Statistical Experimental Design’s Approach for the Development of Sustainable Clay-Based Ceramics Incorporated with Malaysia’s Electric Arc Furnace Steel Slag Waste

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 442
Author(s):  
Pao Ter Teo ◽  
Siti Koriah Zakaria ◽  
Nurulakmal Mohd Sharif ◽  
Anasyida Abu Seman ◽  
Mustaffa Ali Azhar Taib ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Water Absorption ◽  
Firing Temperature ◽  
Steel Slag ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Arc Furnace ◽  
Eaf Slag ◽  
Full Factorial ◽  
Slag Waste

This study aims to optimize the composition (body formulation) and firing temperature of sustainable ceramic clay-based ceramics incorporated with electric arc furnace (EAF) steel slag waste using general full factorial design (GFFD). The optimization is necessary to minimize drawbacks of high iron oxide’s fluxing agent (originated from electric arc furnace, EAF steel slag waste), which led to severe surface defects and high closed porosity issue of the ceramics. Statistical analysis of GFFD including model adequacy checking, analysis of variance (ANOVA), interaction plots, regression model, contour plot and response optimizer were conducted in the study. The responses (final properties of ceramics) investigated were firing shrinkage, water absorption, apparent porosity, bulk density and modulus of rupture (MOR). Meanwhile, the factors employed in experimental parameters were weight percentage (wt.%) of EAF slag added and firing temperature. Upon statistical analysis, GFFD has deduced that wt.% amount of EAF slag added and firing temperatures are proven to significantly influence the final properties of the clay-based ceramic incorporated with EAF slag. The results of conducted statistical analysis were also highly significant and proven valid for the ceramics. Optimized properties (maximum MOR, minimum water absorption and apparent porosity) of the ceramic were attained at 50 wt.% of EAF slag added and firing temperature of 1180 °C.

Evaluation of the Leaching Behavior of Hexavalent Chromium from Malaysian Electric Arc Furnace Steel Slag

2013 ◽  
Vol 652-654 ◽  
pp. 1628-1632 ◽  
Author(s):  
Kolawole Bankole Lateef ◽  
Abdul Rezan Sheikh ◽  
Mohd Sharif Nurulakmal ◽  
Norlia Baharun
Keyword(s):  
Hexavalent Chromium ◽  
Steel Slag ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Rain Water ◽  
Arc Furnace ◽  
Leaching Behavior ◽  
Solid Ratio ◽  
Furnace Steel ◽  
Eaf Slag

This study investigates the leaching behavior of hexavalent chromium (Cr (VI)) from both industrial electric arc furnace steel slag and steel slag modified with up to 2% wt Cr2O3. The study was performed with European standard batch leaching test for 15 days and the lixiviant used were alkaline, de-ionized and rain water. The experimental work was also complimented with slag characterization using XRF, XRD and SEM/EDX analysis. After 15 days, Cr (VI) was found to be highest in rain water (0.016 mg/L) and lowest in de-ionized water (0.002 mg/L). With more Cr2O3 in EAF slag, more Cr will leach out based on the 2% wt Cr2O3 addition. Besides the lixiviant used, slag stirring speed and liquid to solid ratio also affect the dissolution of Cr (VI). With up to 2 wt % Cr2O3 in EAF slag, Cr (VI) dissolution was still lower than the threshold of 0.1 mg/L set by USEPA for public water systems. The analysis also indicated that the relative amounts of soluble basic and acidic oxides in the slag will affect the dissolution of Cr (VI).

scholarly journals The effect of microstructure on the leaching behaviour of electric arc furnace (EAF) carbon steel slag

2016 ◽  
Vol 102 ◽  
pp. 810-821 ◽  
Author(s):  
D. Mombelli ◽  
C. Mapelli ◽  
S. Barella ◽  
C. Di Cecca ◽  
G. Le Saout ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Steel Slag ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Arc Furnace ◽  
Leaching Behaviour ◽  
Effect Of Microstructure
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