Study On Optimized Process Of Paper Sludge Fiberboard

With the development of paper industry, production of paper sludge has been increasing rapidly, and the pollution of papermaking sludge has been increased seriously. Therefore, the properly scientific treatment and utilization of paper sludge have become the most important subjects at home and abroad. This study used paper mill to manufacture sludge fiberboard which solved the problem of dealing with a lot of sludge, reduced the environmental pollution, at the same time opened up a new raw material source for the production of wood-based panels, protected the ecological environment, and utilized wood economically. The primary property of the paper sludge, the effect of urea-formaldehyde resin (UF) and phenolic resin (PF) on sludge fiberboard, wood fiber-reinforced paper sludge fiberboard, bamboo paper sludge-bark fiberboard, and bamboo paper sludge fiberboard-veneer composite particleboard were studied. The main research findings are summarized as follows:(1) Used Optical Microscope, Elemental Analysis, XRD, Contact Angle Tester, and so on to study physical and chemical properties of paper sludge:the moisture content of wet paper sludge was72.10%; the organic material content was49.85%; pH was6.60; fiber content of dry content sludge was39%; the length of most fiber (about80.64%) was in the range of50to230pm; C, H, N, S element of wet paper sludge was9.93%,1.44%,0.35%,0.39%, responsibility. The moisture content of wet bamboo paper sludge was79.90%; pH was6.62; the holocellulose content was16.52%; the lignin content was0.0025%; the length of most fiber was in the range of1600to1800μm; the relative crystallinity was61.48%.(2) Used Fourier Transform Infrared Spectrometer (FT-IR) and Synchronization Thermal Analyzer to study the bonding mechanism with UF, PF and paper sludge. The results of FTIR showed:Si, in the surface layers of sludge, was detected in kinds of forms silicon dioxide. After glue application, compared to adhesive joint of PF and sludge, the layer of resin was thicker than urea formaldehyde (UF) and sludge. And much active was detected by phenol-formaldehyde (PF). And the study of TG-DSC showed that there were no phenomena of absorbing and putting hot when the paper mill sludge was heated. And there were certain obvious phenomena of absorbing and putting hot when UF and paper mill sludge were heated. Compared to UF and sludge the hot-reaction was clearer by paper mill sludge and PF. (3) In this study, manufacture board by paper mill sludge solely also indicated that the density was the most important effect to the bending properties of sludge board. And for the temperature and time of hot press which was not the most important. For needs of the Program, the better appropriate technical conditions were as follows:thickness-10mm, density-0.8g/cm3, hot press temperature-160℃, hot press time-30sec/mm, the resin content for the paper mill sludge-13%.(4) Techniques of paper mill sludge and wood fiber composite boards also indicated that wood fiber to paper mill sludge ratio had great influence on the properties of board. And the effect of mixing methods on the mechanical properties was not obvious. With the adding of wood fiber, the physical and mechanical of board increased evidently. The optimal parameter composite of board as follows:the density-0.8g/cm3, the PF resin content for the paper mill sludge-13%, for wood fiber-10%, hot press temperature-160℃, hot press time-30sec/mm. And the spreading raw materials were separated. With30%Non-classification sludge-grain, the experiment results of MOR, MOE, IB, after boiling IB, TS were27.08MPa,2.82GPa,1.035MPa,0.225MPa, and6.46%.(5) All the products were produced in the lab, most of the bamboo paper mill sludge fiberboard can not satisfy the requirements, because personal factors played a great role on these. The use of advanced equipment was expected to significantly improve product performance.(6) The results showed that the ratio of bamboo paper mill sludge had great affected on the properties of board, the mixing methods on the mechanical properties was not obvious. The mechanical properties of plywood was good not only than both bamboo paper mill sludge solely but also with the bark.