Abstract:

A series of high- efficiency bamboo lignin- based dispersants for the pulping of coal phenol- water slurrywere prepared by using bamboo black liquor as the main raw material. Then,the influences of relative molecularmass and sulfonation degree of the dispersant on the slurry fluidity were investigated. Furthermore, the effects of thetype and dosage of additive,the dispersant do- sage and the pulping temperature on the pulping performance and thestability properties of coal phenol- water slurry were discussed.The results indicate that (1) as compared withFDN,the dispersant with moderate sulfonation degree and medium relative molecular mass possesses better pulpingperformance in reducing the viscosity of coal phenol- water slurry; (2) the combination of sodium tripolyphosphateand the dispersant may reduce the apparent viscosity of the slurry and 15% is a suitable dosage of sodium tri-polyphosphate; (3) the apparent viscosity of the slurry continuously decreases with the increase of dispersant do-sage; (4) with the increase of pulping temperature,the apparent viscosity of the slurry first decreases and then in-creases,with its minimum occurring at 55℃; and (5) coal phenol- water slurry shows best stability properties atthe optimal dispersant dosage of 0.75%.

Key words: bamboo black liquor, bamboo lignin- based dispersant, coal phenol- water slurry, sulfonation degree, relative molecular mass, stability property, fluidity