Decomposition of asbestos by a supernatant used for immobilization of heavy metals in fly ash

Tabata, Masaaki; Shono, Akifumi; Ghaffar, Abdul

doi:10.1007/s10163-016-0491-2

Cited by 12 publications

(1 citation statement)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, thermal treatment requires vast amounts of energy for decomposition or melting of asbestos, due to the material's high heat resistance. Chemical detoxification methods using H 2 SO 4 [12], FSO 3 H [13], CHClF 2 -decomposed acidic gas [14], re-used supernatant from fly ash treatment [15], and H 2 C 2 O 4 [16][17][18] could also effectively decompose asbestos materials. Strong acids, such as sulfuric acid (H 2 SO 4 ), hydrochloric acid (HCl), and hydrofluoric acid (HF), have been extensively investigated as decomposition agents for asbestos detoxification treatments.…”

mentioning

confidence: 99%

A Low Temperature Detoxification Method for Treatment of Chrysotile-Containing Waste Roofing Slate

Jang

2017

Minerals

View full text Add to dashboard Cite

Abstract:In this study, we evaluated a two-step process for detoxification of waste roofing slate, involving cement hydrate removal and low temperature detoxification using oxalic acid. These treatments were conducted on raw material and intermediate product, respectively. Cement hydrate removal effectively eliminated most Ca-containing cement hydrate components from the raw material under the following conditions: HCl to solid ratio: 0.456 g/g, reaction time: 2 h, and solid to liquid ratio: 0.124 g/mL. Following low temperature (~100 • C) detoxification of intermediate product obtained after cement hydrate removal, chrysotile in waste roofing slate was effectively transformed to Mg-oxalate under conditions of oxalic acid to solid ratio of >0.67 g/g.

show abstract