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.     

STAY CLEAN AND TAKE CARE——A TALK ON AIDS AND U.S.UNIVERSITY CULTURE

This paper aims at giving young students a public education of AIDS, which hasbeen almost universally viewed as the most effective weapon against the spread of AIDS. The author presents his firsthand information in illustration of the cause of AIDS for Americanuniversity students. Hopefully, it drops a useful hint for answering the question —Why is AIDSspreading so quickly in the United States? Finally, a few questions are raised to set people thinking and call forth their early vigilanceagainst the spread of AIDS in China.