13.Study on the depression mechanism of carboxymethyl chitosanon fluorite in the flotation of bastnaesite

Abstract:

The depression mechanism of CTS on fluorite was investigated through flotation tests,contact angle analysis,bubbleparticleattachment angle (θ)analysis,Zeta potential analysis,XPS analysis,and other measurement techniques. The results indicate that atpH 9. 8 and CCTS = 20 mg / L,the flotation recovery of fluorite was 12. 5% ,while the recovery of bastnaesite remained at 86. 7% . XPSresults show two fitted peaks at 348. 18 eV and 351. 73 eV,belonging to Ca(COOR),primarily due to the chemical adsorption betweenthe —COOH groups in CTS molecules and the Ca sites on the fluorite surface. In contrast,the adsorption of CTS on the bastnaesite surface is weak and does not interfere with the adsorption of the collector octyl hydroxamic acid (OHA),allowing the surface to maintaingood floatability. Therefore,as a green,easily degradable,and highly selective depressant,CTS enables efficient separation of bastnaesite and fluorite.

Keywords: bastnaesite;fluorite;bubbleparticle attachment angle;selective adsorption