The rheological behavior of low consistency thermomechanical pulp of Chinese fir harvested by intermediate thinning was analyzed. The results show that the apparent viscosity of pulp changed along with the beating deg...The rheological behavior of low consistency thermomechanical pulp of Chinese fir harvested by intermediate thinning was analyzed. The results show that the apparent viscosity of pulp changed along with the beating degree, pulp consistency and shearing velocity. With the increasing of pulp consistency, the apparent viscosity of pulp increased gradually. Beating degree of pulp had an effect on microstructure of pulp. The apparent viscosity of pulp declined as beating degree of pulp increased, and the apparent viscosity of pulp fell along with the shearing velocity increasing. Based on the results, the rheological models are set up. The models showed that the fluid types of the low consistency pulp could be described as pseudoplastics fluids （non-Newtonian fluids）.展开更多
Fly ash is considered as an under-utilized product of pulp and paper industry and is mainly land-filled.However,it can be repurposed as an adsorbent for organics of wastewater effluents.Despite efficient adsorption ca...Fly ash is considered as an under-utilized product of pulp and paper industry and is mainly land-filled.However,it can be repurposed as an adsorbent for organics of wastewater effluents.Despite efficient adsorption capability,its metal components may dissolve in wastewater and harm the environment.This investigation focused on the leaching behavior of metals from biomass-based fly ash in water at pH 6 and 12.5.A similar investigation was performed in the spent liquor of a pulping process to evaluate the extraction of metals from fly ash in such an environment that fly ash could be used as an adsorbent.The results revealed that the predominant metals leached from fly ash in water and the spent liquor were Ca,K,Mg,Mn,Na,and Si.The trace metals including Al,Ba,Sr,and Zn were also detected to a significant extent.Interestingly,the extraction of metals from fly ash in spent liquor was more limited than in water,which is beneficial for the application of fly ash in spent liquors.展开更多
基金This study was sponsored by the Research Funding for Outstanding Young University Faculty of China Ministry of Education (No. 2001-39), Fujian Provincial Innovation Fundation for Young Science and Technology Talents (No. 2004J012), and the National Natural Science Funda-tion of China (No. 30571461)
文摘The rheological behavior of low consistency thermomechanical pulp of Chinese fir harvested by intermediate thinning was analyzed. The results show that the apparent viscosity of pulp changed along with the beating degree, pulp consistency and shearing velocity. With the increasing of pulp consistency, the apparent viscosity of pulp increased gradually. Beating degree of pulp had an effect on microstructure of pulp. The apparent viscosity of pulp declined as beating degree of pulp increased, and the apparent viscosity of pulp fell along with the shearing velocity increasing. Based on the results, the rheological models are set up. The models showed that the fluid types of the low consistency pulp could be described as pseudoplastics fluids （non-Newtonian fluids）.
文摘Fly ash is considered as an under-utilized product of pulp and paper industry and is mainly land-filled.However,it can be repurposed as an adsorbent for organics of wastewater effluents.Despite efficient adsorption capability,its metal components may dissolve in wastewater and harm the environment.This investigation focused on the leaching behavior of metals from biomass-based fly ash in water at pH 6 and 12.5.A similar investigation was performed in the spent liquor of a pulping process to evaluate the extraction of metals from fly ash in such an environment that fly ash could be used as an adsorbent.The results revealed that the predominant metals leached from fly ash in water and the spent liquor were Ca,K,Mg,Mn,Na,and Si.The trace metals including Al,Ba,Sr,and Zn were also detected to a significant extent.Interestingly,the extraction of metals from fly ash in spent liquor was more limited than in water,which is beneficial for the application of fly ash in spent liquors.
