Abstract
The acid leaching of chrysotile was investigated in different acid media with the aim of quantifying and obtaining insights into the dissolution mechanism. Chrysotile was leached in batch reactors for 1 to 30days at 25°C and pH1 in aqueous solutions of nitric and sulfuric acid and different concentrations of oxalic acid (50, 100 and 200mmolL−1). The combined analysis of solutions and solids by XRD and FTIR shows different effects: nitric acid induces a strong dissolution after 30days, lowering the crystallinity of the sample and initiating the transformation of the chrysotile into an amorphous siliceous material. In the case of sulfuric acid, the dissolution is so intense that it is able to destroy the brucitic sheet of chrysotile, leading to an amorphous silica byproduct. Finally oxalic acid is also able to induce amorphization of chrysotile and the precipitation of glushinskite (MgC2O4·2H2O). As the concentration of oxalic increases from 50 to 200mmolL−1 the amorphization process becomes faster. Finally, the relative effectiveness of acid attack to chrysotile is oxalic acid (9days)>sulfuric acid (30days)>nitric acid.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
