The influence of single and compound dispersant on the sedimentation performance of modifiedultrafine Al(OH)3powder aqueous suspension was studied by the determination of the settlement rate and the Zeta potential.The...The influence of single and compound dispersant on the sedimentation performance of modifiedultrafine Al(OH)3powder aqueous suspension was studied by the determination of the settlement rate and the Zeta potential.The results showed that the type and dosage of the dispersant have remarkable impacts on the dispersion stability.Using the mixture of DP-270and Sodium C16alkylbenzenesulfonate(mass ratio=1∶1)in the Al(OH)3aqueous suspension,the dispersion stability was improved effectively.As for spherical partic...展开更多
Surface tension of sodium aluminate solution and the contact angle between Al（OH）3 particles and aluminate solution were measured, then the dependence of Al（OH）3 solubility on its particle size was calculated and ...Surface tension of sodium aluminate solution and the contact angle between Al（OH）3 particles and aluminate solution were measured, then the dependence of Al（OH）3 solubility on its particle size was calculated and thus the variation of the critical nucleus sizes was determined based on the Ostwald ripening formula. The results show that the Al（OH）3 solubility in sodium aluminate solution decreases with the increment of particle size, and the critical nucleus sizes increase with the rise of alkali concentration, caustic ratio and precipitation temperature. The results also imply that the presence of small particles in seeded precipitation system is an important factor to limit the depth of precipitation.展开更多
文摘The influence of single and compound dispersant on the sedimentation performance of modifiedultrafine Al(OH)3powder aqueous suspension was studied by the determination of the settlement rate and the Zeta potential.The results showed that the type and dosage of the dispersant have remarkable impacts on the dispersion stability.Using the mixture of DP-270and Sodium C16alkylbenzenesulfonate(mass ratio=1∶1)in the Al(OH)3aqueous suspension,the dispersion stability was improved effectively.As for spherical partic...
基金Project(51274242)supported by the National Natural Science Foundation of China
文摘Surface tension of sodium aluminate solution and the contact angle between Al（OH）3 particles and aluminate solution were measured, then the dependence of Al（OH）3 solubility on its particle size was calculated and thus the variation of the critical nucleus sizes was determined based on the Ostwald ripening formula. The results show that the Al（OH）3 solubility in sodium aluminate solution decreases with the increment of particle size, and the critical nucleus sizes increase with the rise of alkali concentration, caustic ratio and precipitation temperature. The results also imply that the presence of small particles in seeded precipitation system is an important factor to limit the depth of precipitation.
