Abstract: Run-of-mine attapulgite clay was activated by roasting and microwave respectively after its purification and grinding by ball mill.Comparative analysis was made of the two activated products by FT-IR and TEM.ROM attapulgite clay, purified product and two activated products were used as micro-particles to form a micro-particles retention system with cationic polyacrylamide (CPAM) respectively, which was used in the retention test for an alkaline peroxide mechanical pulp (APMP).The test results indicate that roasting activation has a greater effect on the composition and structure of attapulgite than microwave activation, while the latter can more evidently improve the dispersity of attapulgite; both activations can obviously improve the retention effect of the retention system made up of attapulgite and CPAM, and however, the performance of the system with microwave activated product is better , with the first pass retention rate of APMP reaching 92.46%.

Key words: Attapulgite, icrowave, oast, ctivation, icro-particle retention system