ADSORPTION AND FLOCCULATION BEHAVIORS OF ILMENITE AND FELDSPAR IN THE PRESENCE OF SULPHONATED POLYACRYLAMIDE——Experimental

The adsorption of Sulphonated polyacrylamide(PAMS)on ilmenite and feldspar fromaqueous solution and the floeculation of minerals by PAMS have been studied.The researchresults reveal that the strong adsorption of PAMS on ilmenite results in its strongflocculation and the weak adsorption of PAMS on feldspar causes its dispersion to be morestable.The mechanism of PAMS bonding is discussed in terms of co-ordination and H-bonding interaction respectively in the light of molecular orbit.The co-ordination between—So_3~- on PAMS chain and sites of Ti~(4+) or Fe~(2+) on ilmenite was testified by electron spec-troscopy(PHI550ESCA/AES).Consequently new technology“Bulk flocculation-magneticsepa-ration-ultrasonic deflocculation-magnetic separation”for fine ilmenite/titano-magnetite/feld-spar system has been successfully developed.     

HOMOPOLYMERS AND COPOLYMERS OF GLYCOLIDE AND LACTIDE

The homopolymerization and copolymerization of glycolide (GA) and lactide (LA) are des-cribed. The resulting polymers are characterized by differential scanning calorimetry (DSC),thermogravimetric analysis (TGA), 300 MHz proton nuclear magnetic resonance spectroscopy(NMR), infrared spectroscopy, and X-ray diffraction. The rheological properties of PGA andPGLA 910 are evaluated by shear experiments. The biodegradation has been studied in vivo. Theresults show that the polyesters can be absorbed by the muscles of rabbits after 60 days.