Effect of Cerium on Characteristic of Inclusions and Grain Boundary Segregation of Arsenic in Iron Melts

Xin, Wenbin; Song, Bo; Song, Mingming; Song, Gaoyang

doi:10.1002/srin.201400332

Cited by 30 publications

(20 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…RE 2 O 3 , RE 2 O 2 S, and RES are possible oxides, sulfides, and oxysulfides, respectively. For the arsenic ones, CeAs and LaAsO 4 were identified [3,25,28]. The remaining ones, however, have not been identified yet.…”

Section: Introductionmentioning

confidence: 96%

“…These elements are very hard to remove during the mainstream steelmaking process. Arsenic is easy to segregate to phase and grain boundaries in the solidification, heat treatment, oxidation, and cooling process [3][4][5][6]. These arsenic-rich grain boundaries are potential crack sources under high temperatures because of the low melting point of arsenic, and the segregation of arsenic significantly reduces the binding force of grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Distribution of Arsenic Inclusions in Rare Earth Steel Ingots

Wang

Jiang

et al. 2020

Metals

View full text Add to dashboard Cite

Trace element arsenic is detrimental to the quality and properties of steel products. We used lanthanum to modify the distribution of arsenic by the formation of arsenic rare earth inclusions and investigated all inclusions on the full profile of the ingots prepared in the laboratory. The results show that the addition of lanthanum has dramatically influenced the distribution of arsenic in the ingots by the formation of arsenic inclusions. The arsenic inclusions turn out to be mainly the cluster-shaped La-S-As, as well as its composite inclusions combined with LaS and La-As. La-S-As can be considered a solid solution of LaS and LaAs. They distribute mainly at the top surface of the ingots within 3 mm, at the side and bottom surfaces within 1.5 mm, leading to a dramatic decrease of arsenic concentration at the inner part of the ingots. This distribution characteristic of La-S-As can be used to manufacture steel ingots with very low arsenic concentration by peeling off these (La-S-As)-containing layers. On the contrary, the distribution of composite inclusions (La-S-As)-(La-As) and single-phase La-As, is uniform. Except for the reaction with arsenic, lanthanum can also react with phosphorous and antimony to modify the existing state of these trace elements.

show abstract

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Distribution of Arsenic Inclusions in Rare Earth Steel Ingots

Wang

Jiang

et al. 2020

Metals

View full text Add to dashboard Cite

show abstract

“…13,14) It was proved that RE-As even RE-O-S-As inclusions might form in arsenic RE steels. 15,16) What kinds of inclusions may form greatly depends on the chemical compositions of steel, especially the concentrations of RE, O and S; further, the formation of arsenic inclusions depends to a large extent on RE inclusions. It was reported that arsenic existed as many kinds of inclusions in steel, such as RES•AsS, 16) RE-As or RE-O-As 17) and RE-As-P. 18) However, the formation mechanism of RE inclusions is still controversial for the lack of thermodynamic data, especially for arsenic inclusions.…”

Section: Introductionmentioning

confidence: 99%

An <i>in situ</i> Study of the Formation of Rare Earth Inclusions in Arsenic High Carbon Steels

et al. 2019

View full text Add to dashboard Cite

The application of rare earths is an effective way to stabilize residual elements in steel, such as As and P, so as to improve the performances of steel products. In situ methods were used to investigate the formation of inclusions and their stability at high temperatures in arsenic high carbon steels with additions of lanthanum. The results show that La 2 O 3 and La 2 O 2 S started generating in molten steel and had significant difference of appearances and growth behaviors. La 2 O 3 started with triangular particles and rapidly grew up like crystals; by contrast, La 2 O 2 S particles were always spherical or near-spherical and didn't significantly grow up. Arsenic existed as LaAsO 4 that turned out to be unstable under high temperatures. LaAsO 4 decomposed and As dissolved into the matrix when the temperature was higher than 1 200°C. The formation of LaAsO 4 during solidification and the dissolution of As into the matrix during heat treatment can effectively avoid the local enrichment of As. Therefore, it is possible to control As distributed uniformly in steel by appropriate heat treatment process.

show abstract

“…Arsenic has an adverse effect on steel; for instance, the surface hot shortness increases, and the reduction of area and impact toughness decrease with the increase of arsenic content in steel [3][4][5][6]. Under the hot rolling or welding conditions, the arsenic in the steel leads to the increase in the content of arsenic at grain boundaries and the expansion of welding cracks [4,[7][8][9]. Moreover, as the oxidability of arsenic is less than that of iron, it is difficult to remove arsenic by oxidation in the ironmaking or steelmaking process.…”

Section: Introductionmentioning

confidence: 99%

Arsenic Removal from Arsenopyrite-Bearing Iron Ore and Arsenic Recovery from Dust Ash by Roasting Method

Cheng

Zhang

2019

Processes

View full text Add to dashboard Cite

In most cases, arsenic is an unfavorable element in metallurgical processes. The mechanism of arsenic removal was investigated through roasting experiments performed on arsenopyrite-bearing iron ore. Thermodynamic calculation of arsenic recovery was carried out by FactSage 7.0 software (Thermfact/CRCT, Montreal, Canada; GTT-Technologies, Ahern, Germany). Moreover, the arsenic residues in dust ash were recovered by roasting dust ash in a reducing atmosphere. Furthermore, the corresponding chemical properties of the roasted ore and dust ash were determined by X-ray diffraction, inductively coupled plasma atomic emission spectrometry, and scanning electron microscopy, coupled with energy-dispersive X-ray spectroscopy. The experimental results revealed that the arsenic in arsenopyrite-bearing iron ore can be removed in the form of As 2 O 3 (g) in an air or nitrogen atmosphere by a roasting method. The efficiency of arsenic removal through roasting in air was found to be less than that in nitrogen atmosphere. The method of roasting in a reducing atmosphere is feasible for arsenic recovery from dust ash. When the carbon mass ratio in dust ash is 1.83%, the arsenic removal products is almost volatilized and recovered in the form of As 2 O 3 (g).Processes 2019, 7, 754 2 of 12 decreasing greatly in the earth, and arsenic-bearing ore needs to be comprehensively utilized through ore blending. Some metallurgical enterprises at home and abroad, such as Peru, Chile, Philippines, France, Mexico, and China, have adopted some arsenic-bearing ore in the metallurgical industry [11]. When these arsenic-bearing ores are used, they are faced with the problem of arsenic removal from ores and the problem of arsenic-bearing dust treatment from the point of view of environmental protection.Arsenic can be removed from arsenic-bearing ore by a roasting or sintering method due to the volatile nature of arsenic and its compounds [12]; thus, some scholars have explored the appropriate arsenic removal conditions by performing roasting or sintering experiments. Yin et al. and Lu et al. studied arsenic removal from copper-silver ore using a roasting method [13,14], and the impact of different parameters (e.g., temperature, atmosphere, and roasting time) on the arsenic removal ratio was also evaluated. Lu et al. investigated arsenic removal from arsenic-bearing iron ore during the sintering process [15,16]. The effects of temperature, bed depth, gas pressure, and coal ratio on arsenic removal during the sintering process were studied, and the reasonable technical parameters were obtained. In addition to the arsenic removal tests by roasting and sintering methods, a number of scholars also carried out thermodynamic calculations on arsenic removal, and discussed the arsenic-bearing products and suitable conditions for arsenic removal. Chakraborti and Lynch analyzed the As-S-O vapor system [17] and further identified the importance of bed depth in the rapid release of arsenic from arsenical materials under an oxidizing atmosphere. Contreras et al. ev...

show abstract

Effect of Cerium on Characteristic of Inclusions and Grain Boundary Segregation of Arsenic in Iron Melts

Cited by 30 publications

References 26 publications

Distribution of Arsenic Inclusions in Rare Earth Steel Ingots

Distribution of Arsenic Inclusions in Rare Earth Steel Ingots

An <i>in situ</i> Study of the Formation of Rare Earth Inclusions in Arsenic High Carbon Steels

Arsenic Removal from Arsenopyrite-Bearing Iron Ore and Arsenic Recovery from Dust Ash by Roasting Method

Contact Info

Product

Resources

About