Heavy Metal Leaching Behavior of Glasses Containing EAF Dust

Stabilizing characteristics of heavy metals in the silicate glass (SD) and lead silicate glass(PD) containing Electric Arc Furnace(EAF) dust was studied by the toxic characterization leaching procedure(TCLP) test. Dependence of the amount of EAF dust upon structural changes of SD and PD glasses and TCLP results was also investigated by FT-IR spectroscopy. In the TCLP test, the concentration of heavy metals leached from a glass increased with the amount of EAF dust added. The SD series specimens showed heavy metal leaching lower than the PD series specimens, but the Pb leaching from the PD series specimens was the highest owing to the high Pb content in the PD glass composition. The value R(oxygen/network former ion ratio) was used to compare the leaching characteristics of glasses, and the SD had a higer R than PD series specimens to show a better chemical durability. Adding the EAF dust to the SD mother glass decreased the Si-O-Si symmetry and increased the non-bridging oxygen, which weakened the structure and decreased the chemical durability of glasses. It is concluded that SD is more effective in stabilizing the heavy metals of EAF dust than PD series glass.

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Heavy Metal Leaching Characteristics of Silicate Glass Containing EAF Dust

Journal of the Korean Ceramic Society ◽

10.4191/kcers.2006.43.2.136 ◽

2006 ◽

Vol 43 (2) ◽

pp. 136-141

Keyword(s):

Heavy Metal ◽

Silicate Glass ◽

Metal Leaching ◽

Heavy Metal Leaching ◽

Eaf Dust ◽

Leaching Characteristics

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Heavy Metals Leaching of Active Carbon from Sewage Sludge Modified by Chitosan for Dye Wastewater Treatment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.627.399 ◽

2012 ◽

Vol 627 ◽

pp. 399-403

Author(s):

Xiao Dan Fan ◽

Xiang Kai Zhang

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Wastewater Treatment ◽

Activated Carbon ◽

Sewage Sludge ◽

Contact Time ◽

Metal Leaching ◽

Dye Wastewater ◽

Concentration Increase ◽

Heavy Metal Leaching

Heavy metal leaching limits activated carbon from sewage sludge (referred as ACS) to be used for wastewater treatment. Cr and Cd leaching from ACS exceed the permitted values. The leaching content of Cr and Cd decrease much with depositing ACS with chitosan (CS),below the permitted values. This is mainly due to the bind of Cr and Cd with the much group –NH2 of CS. The effects of initial dye concentration, pH and contact time had been studied. The dye adsorbed can act as a supple complexion agent with increasing initial dye concentration, increase the affinity for Cr and Cd. For Cd, the amount leaching of CS/ACS or ACS remains content with pH.The amount leaching of Cr decreases when the pH from 1 to 5 and then increases above the pH of 6.0. The contact time has no important influence on the leaching contents of Cr or Cd.

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Heavy Metal Leaching Behavior of Glasses Containing EAF Dust

Materials Science Forum - Eco-Materials Processing & Design VI ◽

10.4028/0-87849-966-0.382 ◽

2005 ◽

pp. 382-386

Author(s):

Hee Tai Eun ◽

Seung Gu Kang ◽

Yoo Taek Kim ◽

Gi Kang Lee ◽

Jung Hwan Kim

Keyword(s):

Heavy Metal ◽

Metal Leaching ◽

Leaching Behavior ◽

Heavy Metal Leaching ◽

Eaf Dust

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The use of a biodegradable chelator for enhanced phytoextraction of heavy metals by Festuca arundinacea from municipal solid waste compost and associated heavy metal leaching

Bioresource Technology ◽

10.1016/j.biortech.2012.11.075 ◽

2013 ◽

Vol 129 ◽

pp. 249-255 ◽

Cited By ~ 19

Author(s):

Shulan Zhao ◽

Lina Jia ◽

Lian Duo

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Municipal Solid Waste ◽

Solid Waste ◽

Festuca Arundinacea ◽

Metal Leaching ◽

Heavy Metal Leaching ◽

Municipal Solid Waste Compost ◽

Enhanced Phytoextraction

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Immobilization of Heavy Metals in Boroaluminosilicate Geopolymers

Materials ◽

10.3390/ma14010214 ◽

2021 ◽

Vol 14 (1) ◽

pp. 214

Author(s):

Piotr Rożek ◽

Paulina Florek ◽

Magdalena Król ◽

Włodzimierz Mozgawa

Keyword(s):

Mechanical Properties ◽

Heavy Metals ◽

Heavy Metal ◽

Compressive Strength ◽

Phase Composition ◽

Molar Ratio ◽

Metal Leaching ◽

Heavy Metal Leaching ◽

Composition Structure ◽

Structure And Microstructure

Boroaluminosilicate geopolymers were used for the immobilization of heavy metals. Then, their mechanical properties, phase composition, structure, and microstructure were investigated. The addition of borax and boric acid did not induce the formation of any crystalline phases. Boron was incorporated into the geopolymeric network and caused the formation of N–B–A–S–H (hydrated sodium boroaluminosilicate) gel. In the range of a B/Al molar ratio of 0.015–0.075, the compressive strength slightly increased (from 16.1 to 18.7 MPa), while at a ratio of 0.150, the compressive strength decreased (to 12 MPa). Heavy metals (lead and nickel) were added as nitrate salts. The loss of the strength of the geopolymers induced by heavy metals was limited by the presence of boron. However, it caused an increase in heavy metal leaching. Despite this, heavy metals were almost entirely immobilized (with immobilization rates of >99.8% in the case of lead and >99.99% in the case of nickel). The lower immobilization rate of lead was due to the formation of macroscopic crystalline inclusions of PbO·xH2O, which was vulnerable to leaching.

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The Evaluation of the Heavy Metal Leaching Behavior of MSWI-FA Added Alkali-Activated Materials Bricks by Using Different Leaching Test Methods

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph16071151 ◽

2019 ◽

Vol 16 (7) ◽

pp. 1151 ◽

Cited By ~ 1

Author(s):

Peng Xu ◽

Qingliang Zhao ◽

Wei Qiu ◽

Yan Xue

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Fly Ash ◽

Metal Leaching ◽

Alkali Activation ◽

Leaching Tests ◽

Leaching Behavior ◽

Heavy Metal Leaching ◽

Environmental Compatibility ◽

Alkali Activated

Alkali-activated materials (AAMs) not only have the potential to replace cement applications in architecture and civil engineering, but also have an excellent effect on the stabilization solidification of hazardous industrial wastes. This study used two types of municipal solid waste incineration fly ash (MSWI-FA)—grate firing fly ash (GFFA) and fluidized bed fly ash (FBFA)—as AAMs brick raw materials. It is discovered from this study that AAMs bricks with different weight ratios of GFFA and FBFA can both meet the required standard of GB21144-2007 (Solid concrete brick). From the results obtained from the four leaching tests, the equilibrium pH of the leachate varies, resulting in significant differences in the leaching of heavy metals in Raw GFFA, Raw FBFA, and AAMs bricks with GFFA and FBFA. The AAMs brick with the addition of GFFA and FBFA has an alkali activation system to encapsulate heavy metals. By comparing the results obtained from the CEN/TS 14429 leaching behavior test and the four batch leaching tests, it was found that the most influential factors for the heavy metal leaching concentration are whether the heavy metal has been solidified/stabilized in the samples. GFFA and FBFA tend to have consistent characteristics after being activated by alkali to form AAMs bricks. This can be confirmed by the acid neutralization ability concentrated on a specific pH range. The results obtained from CEN/TS14429 verified that the AAMs bricks with the addition of GFFA and FBFA have excellent environmental compatibility and that it provides a comprehensive evaluation on the environmental compatibility of the test materials and products. This demonstrated that the MSWI-FA is suitable for used as alkali-activated materials and its products have the potential to be commercially used in the future.

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Corrosion of Silicate Glasses and Glass-Ceramics Containing EAF Dust in Acidic Solution

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.124-126.1585 ◽

2007 ◽

Vol 124-126 ◽

pp. 1585-1588 ◽

Cited By ~ 2

Author(s):

Hwan Sik Kim ◽

Yoo Taek Kim ◽

Gi Gang Lee ◽

Jung Hwan Kim ◽

Seung Gu Kang

Keyword(s):

Heavy Metal ◽

Glass Ceramic ◽

Acidic Solution ◽

Glass Ceramics ◽

Glass Network ◽

Metal Leaching ◽

Leaching Test ◽

Spinel Crystal ◽

Heavy Metal Leaching ◽

Eaf Dust

The corrosion behavior of glass and glass-ceramics fabricated with silicate glass frit mixed with 50~70 wt% EAF dust in the acidic solution was analyzed by both heavy metal leaching test and microstructural observation. The crystallization temperature, Tc of glassy specimens was around 850 measured by DTA and the heat treatment temperature to crystallize a glassy specimen was selected as 950 / 1 hr. The spinel crystal peaks were found in XRD analysis for the glass containing dust > 60 wt%. For the glass-ceramics, however, the spinel peaks in a specimen containing dust > 50 wt% was found with weak willemite peaks. The glass and glass-ceramic specimens showed the first stage of corroding reaction according to Clark models in acidic solution. The glass-ceramic specimens showed much lower a heavy metal leaching concentration than that of glass specimens in the corrosion test in acidic solution of pH=2.95. Especially, the glass-ceramics containing dust 60 wt% showed a heavy metal leaching concentration of 66 % Pb, 60 % Zn and 98 % Fe lower than that of glass specimens due to crystal phases formed, thermodynamically more stable than a glass network structure. From the leaching test that more Zn ion leached out than Fe ion, the spinel crystal phase [ZnFe2O4] showed better corrosion resistant in the acidic solution than the willemite [Zn2SiO4].

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