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

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...

Full description

Saved in:
Bibliographic Details
Published inMinerals (Basel) Vol. 7; no. 8; p. 144
Main Authors Jo, Hwanju, Jang, Young Nam, Jo, Jung Hyun
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 10.08.2017
Subjects
asbestos
Building materials
Cement
Cements
Chrysotile
Concrete
Detoxification
Hydrates
Low temperature
Mg oxalate
Oxalic acid
Raw materials
Reaction time
Removal
Roofing
Temperature effects
Online AccessGet full text

Cover

More Information
Summary: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.
ISSN:2075-163X
2075-163X
DOI:10.3390/min7080144