Sodium Hydroxide Dosage Optimization for Chemi-mechanical Pulp Bleaching Process
The optimum dosage of sodium hydroxide in bleaching section of poplar chemi-mechanical pulp was studied.When the mass ratio of hydro-gen peroxide and sodium hydroxide was 1∶1,the whiteness of pulp was the highest.To improve the strength index of chemi-mechanical pulp,the dos-age of sodium hydroxide should be appropriately increased.To improve the bulk and opacity,the dosage of sodium hydroxide should be reduced,in order to prevent the chemi-mechanical pulp from yellowing after a period of time in the pulp storage tower,the residual hydrogen peroxide in the chemi-mechanical pulp should be more than 10％total usage of the hydrogen peroxide in the bleaching section.According to the test results,the bleaching process of chemi-mechanical pulp production line was adjusted and optimized,and the pulp quality reached the expected effect.
chemi-mechanical pulpbleachingpulp qualitiesdosage optimization of sodium hydroxide
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