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›› 2006, Vol. 40 ›› Issue (5): 7-10.

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Study on Surface Chemistry Characteristics of Fines (Ⅰ) ——The Effects of pH Value in Wet-end System on Characteristics of Fines

LIU Li-sha, DAI Hong-qi, WANG Shu-mei, YE Chun-hong   

  1. College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
  • Received:2006-05-19 Revised:1900-01-01 Online:2006-09-30 Published:2006-09-30

Abstract: In this paper, the charge demand, beating degree, and water retention value (WRV) of fines including original (P200) and fiber fragment (P'200) which comes from KP bleached eucalyptus pulp are studied when they are affected by pH value. The results show that pH value affected the surface charge of fines, and had greatly effect to the beating degree and the WRV. When pH value raises from 4 to 10, the cationic demands of both P200 and P'200 increase respectively from 0.033 and 0.050 meq/g to 0.060 and 0.110 meq/g;the maximum anion demands of P200 and P'200 are respectively 0.014 and 0.010 meq/g. In the range of pH value 4~10, P200 and P'200 represent negative charge state. At pH neutral condition, the maximum CTR values of P200 and P'200 are respectively 0.4 and 0.2. The effect of pH value on beating degree of P200 is higher than that of P'200, and the effect of pH value on WRV of P200 is less, than that of P'200, P'200 has greater beginning beating degree and WRV.

Key words: fines, pH value, surface chemistry characteristics

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