|
|
|
|
| LEADER |
01000caa a22002652c 4500 |
| 001 |
NLM369607678 |
| 003 |
DE-627 |
| 005 |
20250305222615.0 |
| 007 |
cr uuu---uuuuu |
| 008 |
240313s2024 xx |||||o 00| ||eng c |
| 024 |
7 |
|
|a 10.1080/09593330.2024.2328153
|2 doi
|
| 028 |
5 |
2 |
|a pubmed25n1231.xml
|
| 035 |
|
|
|a (DE-627)NLM369607678
|
| 035 |
|
|
|a (NLM)38471045
|
| 040 |
|
|
|a DE-627
|b ger
|c DE-627
|e rakwb
|
| 041 |
|
|
|a eng
|
| 100 |
1 |
|
|a Cao, Hengyi
|e verfasserin
|4 aut
|
| 245 |
1 |
0 |
|a Characterisation of arsenic levels in acid-treated arsenic-containing sludge after steel slag-fly ash gel curing
|
| 264 |
|
1 |
|c 2024
|
| 336 |
|
|
|a Text
|b txt
|2 rdacontent
|
| 337 |
|
|
|a ƒaComputermedien
|b c
|2 rdamedia
|
| 338 |
|
|
|a ƒa Online-Ressource
|b cr
|2 rdacarrier
|
| 500 |
|
|
|a Date Completed 01.12.2024
|
| 500 |
|
|
|a Date Revised 01.12.2024
|
| 500 |
|
|
|a published: Print-Electronic
|
| 500 |
|
|
|a Citation Status MEDLINE
|
| 520 |
|
|
|a Arsenic-containing sludge (ABG) is a common hazardous waste in the metallurgical industry and poses a serious threat to environmental safety. However, its instability and mobility have a significant impact on the environment. Traditional curing methods are time-consuming and costly, often resulting in incomplete curing. In this study, we introduce a curing/stabilisation method with a steel slag-fly ash gel material after ABG acid treatment. The toxic leaching of arsenic from ABG was reduced to 220 mg/kg by treating the sludge with acids (H2SO4-H3PO4) at different solid-to-liquid ratios. Afterward, H2O2 was added to oxidise As(III) to As(V). The ABG was cured/stabilised using an alkali-activated steel slag-fly ash gel material. The cured product exhibited optimal arsenic fixation under an ABG/steel slag/fly ash mass ratio of 1:4:2, a curing temperature of 60°C, a curing time of 20 h, and an ambient pH of 12.5. Under these conditions, steel slag-fly ash facilitated Ca-As precipitation, resulting in a hydration reaction that produced C-S-H gel. Additionally, the reaction generated calcium hydroxide, calcium and iron pyroxene, silica, and iron ferrite, which adsorbed part of the free arsenic, completing the curing of the acid-treated ABG and stabilising arsenic leaching toxicity. The leaching of arsenic in the ABG was much lower than the Chinese 'Hazardous Wastes Leaching Toxicity Identification Standard' (GB5085.3-2007) (5 mg/L), with an arsenic curing rate exceeding 99%. The mechanism of arsenic solidification involves the combined effects of chemical precipitation, physical encapsulation, and adsorption. Collectively, our findings demonstrated that the use of steel slag-fly ash gel as a functional material for ABG curing holds considerable environmental and economic benefits. Therefore, this study provides theoretical guidance and provides insights into the experimental feasibility of ABG treatment
|
| 650 |
|
4 |
|a Journal Article
|
| 650 |
|
4 |
|a Acid treatment
|
| 650 |
|
4 |
|a calcium silicate hydrate (C-S-H)
|
| 650 |
|
4 |
|a solidified/stabilised
|
| 650 |
|
4 |
|a steel slag-fly ash gel
|
| 650 |
|
7 |
|a Coal Ash
|2 NLM
|
| 650 |
|
7 |
|a Arsenic
|2 NLM
|
| 650 |
|
7 |
|a N712M78A8G
|2 NLM
|
| 650 |
|
7 |
|a Sewage
|2 NLM
|
| 650 |
|
7 |
|a Steel
|2 NLM
|
| 650 |
|
7 |
|a 12597-69-2
|2 NLM
|
| 650 |
|
7 |
|a Industrial Waste
|2 NLM
|
| 650 |
|
7 |
|a Gels
|2 NLM
|
| 650 |
|
7 |
|a Sulfuric Acids
|2 NLM
|
| 700 |
1 |
|
|a Wang, Jianhua
|e verfasserin
|4 aut
|
| 700 |
1 |
|
|a Qi, Xianjin
|e verfasserin
|4 aut
|
| 773 |
0 |
8 |
|i Enthalten in
|t Environmental technology
|d 1993
|g 45(2024), 28 vom: 01. Dez., Seite 6170-6183
|w (DE-627)NLM098202545
|x 1479-487X
|7 nnas
|
| 773 |
1 |
8 |
|g volume:45
|g year:2024
|g number:28
|g day:01
|g month:12
|g pages:6170-6183
|
| 856 |
4 |
0 |
|u http://dx.doi.org/10.1080/09593330.2024.2328153
|3 Volltext
|
| 912 |
|
|
|a GBV_USEFLAG_A
|
| 912 |
|
|
|a SYSFLAG_A
|
| 912 |
|
|
|a GBV_NLM
|
| 912 |
|
|
|a GBV_ILN_350
|
| 951 |
|
|
|a AR
|
| 952 |
|
|
|d 45
|j 2024
|e 28
|b 01
|c 12
|h 6170-6183
|