Study on Arsenic Removal in Molten Steel

2015 ◽  
pp. 699-705
Author(s):  
Lingen Luo ◽  
Jianjun Wang ◽  
Lei Wang ◽  
Zhengbang Li
Keyword(s):  
Molten Steel ◽  
Arsenic Removal

The Arsenic Removal From Molten Steel

2011 ◽  
Vol 30 (1-2) ◽  
Author(s):  
JianJun Wang ◽  
Lingen Luo ◽  
Hui Kong ◽  
Li Zhou
Keyword(s):  
Molten Steel ◽  
Arsenic Removal

scholarly journals Evolution of Inclusions in Steelmaking Process of Rare Earth Steels Containing Arsenic with Alumina Crucibles

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 275 ◽  
Author(s):  
Hongpo Wang ◽  
Peng Yu ◽  
Silu Jiang ◽  
Bin Bai ◽  
Lifeng Sun ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Molten Steel ◽  
Arsenic Removal ◽  
Holding Time ◽  
Arsenic Content ◽  
Severe Reaction ◽  
Steelmaking Process ◽  
Alumina Crucible

In order to determine strategies for removing arsenic from rare earth arsenic-containing steels, the evolution of inclusions in the whole steelmaking process with alumina crucibles was investigated. It has been proven that adding lanthanum has a significant effect on both the existing state and content of arsenic in steel. The content of arsenic steeply decreased after adding 0.148% lanthanum by generating La–S–As inclusions. The addition of 0.054% lanthanum did not dramatically affect the content of arsenic. Both 0.148% and 0.054% additions of lanthanum modified the existing Si–Mn–Al–O inclusions, making them first change to La-containing inclusions, and then change back to Si–Mn–Al–O inclusions. During this process, the compositions of inclusions changed from (SiO2–MnO)-rich to Al2O3-rich ones, owing to the reactions between lanthanum and alumina crucibles. The addition of 0.148% lanthanum resulted in a relatively severe reaction with the alumina crucible. This led to the decomposition of a part of the existing La–S–As inclusions and a slight increase in the arsenic content. Therefore, it is noted that choosing an appropriate holding time after adding rare earth elements to molten steel has a significant effect on the arsenic removal and saving the consumption of rare earth elements.

scholarly journals Effect of Heterogeneous Nucleation on Removal of Arsenic from Molten Steel by Rare Earth Addition

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 664
Author(s):  
Hongpo Wang ◽  
Peng Yu ◽  
Silu Jiang ◽  
Yu Wang
Keyword(s):  
Rare Earth ◽  
Molten Steel ◽  
Heterogeneous Nucleation ◽  
Laboratory Experiments ◽  
Arsenic Removal ◽  
Rare Earth Addition ◽  
Residual Elements ◽  
Initial Content ◽  
Removal Of Arsenic ◽  
High Initial Content

Cleanliness control is an eternal theme to improve the properties of steel products. With the increasing recycling rates of scrap steel, the removal and stabilization of residual elements have become a vital issue for improving the performance of steel products. Thermodynamic and mismatch calculations plus laboratory experiments were carried out to study the heterogeneous nucleation phenomena of inclusions when lanthanum was employed to remove arsenic from molten steel and stabilize arsenic in solid steel. The effect of heterogeneous nucleation on the mechanism of arsenic removal was discussed. A series of heterogeneous nucleation phenomena of inclusions in the La-O-S-As system were discovered, and the heterogeneous nucleation among the inclusions turned out to be selective. As the vital product of arsenic removal, La-S-As is most likely to generate with LaS as heterogeneous nucleation cores, and its possible chemical formula turned out to be 3LaS⸱LaAs. Sulfur plays an essential role in removing arsenic from molten steel by adding lanthanum. It needs to control the initial sulfur content in an appropriate range, because the high initial content causes too much loss of rare earth, and the low initial content cannot produce LaS and La-S-As.

Study on Arsenic Removal in Molten Steel

2015 ◽  
pp. 699-705
Author(s):  
Lingen Luo ◽  
Jianjun Wang ◽  
Lei Wang ◽  
Zhengbang Li
Keyword(s):  
Molten Steel ◽  
Arsenic Removal

Microstructure Changes of Aluminum Titanate Refractory Doped SiO2 and ZrO2 in Molten Steel

2015 ◽  
Vol 48 (6) ◽  
pp. 116-122 ◽  
Author(s):  
Hyeong-Jun Kim ◽  
Dami Kim ◽  
Hyung-Tae Kim ◽  
Sung-Soo Ryu
Keyword(s):  
Molten Steel ◽  
Aluminum Titanate ◽  
Microstructure Changes

IRON OXIDES FROM ELECTROFILTER ASH FOR WATER TREATMENT (ARSENIC REMOVAL)

2009 ◽  
Vol 8 (4) ◽  
pp. 895-900 ◽  
Author(s):  
Ionel Balcu ◽  
Adina Segneanu ◽  
Marius Mirica ◽  
Mirela Iorga ◽  
Catalin Badea ◽  
...  
Keyword(s):  
Water Treatment ◽  
Iron Oxides ◽  
Arsenic Removal

As(III) Removal by Dynamic Adsorption onto Amberlite XAD7 Functionalized with Crown Ether and Doped with Fe(III) Ions

2019 ◽  
Vol 70 (7) ◽  
pp. 2330-2334
Author(s):  
Mihaela Ciopec ◽  
Adina Negrea ◽  
Narcis Duteanu ◽  
Corneliu Mircea Davidescu ◽  
Iosif Hulka ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Arsenic Removal ◽  
Arsenic Concentration ◽  
Fixed Bed ◽  
World Health ◽  
Arsenic Content ◽  
Arsenic Adsorption ◽  
Stage Of Development ◽  
Wide Range ◽  
Health Organization

Arsenic content in groundwater�s present a wide range of concentration, ranging from hundreds of micrograms to thousands of micrograms of arsenic per litter, while the maximum permitted arsenic concentration established by World Health Organization (WHO) is 10 mg L-1. According to the WHO all people, regardless of their stage of development and their social economic condition, have the right to have access to adequate drinking water. The most efficient and economic technique used for arsenic removal is represented by adsorption. In order to make this remediation technique more affordable and environmentally friendly is important to new materials with advance adsorbent properties. Novelty of present paper is represented by the usage of a new adsorbent material obtained by physical - chemical modification of Amberlite XAD polymers using crown ethers followed by iron doping, due to well-known affinity of arsenic for iron ions. Present paper aims to test the obtained modified Amberlite polymer for arsenic removal from real groundwater by using adsorption in a fixed bed column, establishing in this way a mechanism for the adsorption process. During experimental work was studied the influence of competing ions from real water into the arsenic adsorption process.

Arsenic removal by MF membrane with chemical sludge adsorption and NF membrane equipped with vibratory shear enhanced process

2003 ◽  
Vol 3 (5-6) ◽  
pp. 303-310 ◽  
Author(s):  
S.-H. Yi ◽  
S. Ahmed ◽  
Y. Watanabe ◽  
K. Watari
Keyword(s):  
Arsenic Removal ◽  
Membrane Surface ◽  
Membrane Process ◽  
Low Concentrations ◽  
Strong Shear ◽  
Low Levels ◽  
Removal Processes ◽  
Removal Of Arsenic ◽  
Concentration Polarization Layer ◽  
Chemical Sludge

Conventional arsenic removal processes have difficulty removing low concentrations of arsenic ion from water. Therefore, it is very hard to comply with stringent low levels of arsenic, such as below 10 μg/L. So, we have developed two arsenic removal processes which are able to comply with more stringent arsenic regulations. They are the MF membrane process combined with chemical sludge adsorption and NF membrane process equipped with the vibratory shear enhanced process (VSEP). In this paper, we examine the performance of these new processes for the removal of arsenic ion of a low concentration from water. We found that chemical sludge produced in the conventional rapid sand filtration plants can effectively remove As (V) ions of H2AsO4- and HAsO42- through anion exchange reaction. The removal efficiency of MF membrane process combined with chemical sludge adsorption increased to about 36%, compared to MF membrane alone. The strong shear force on the NF membrane surface produced by vibration on the VSEP causes the concentration polarization layer to thin through increased back transport velocity of particles. So, it can remove even dissolved constituents effectively. Therefore, As (V) ions such as H2AsO4- and HAsO42- can be removed. The concentration of As (V) ions decreased from 50 μg/L to below 10 μg/L and condensation factor in recirculating water increased up to 7 times by using NF membrane equipped with VSEP.

Sign in / Sign up

Export Citation Format

Share Document