Method for preparing papermaking sludge recycling agent

Abstract

The invention discloses a method for preparing a papermaking sludge recycling agent. The method comprises the following steps: carrying out an esterification reaction on polyvinyl alcohol and methacrylic acid to form an ester polymer, polymerizing the ester polymer, a cationic monomer DMC and acrylamide under the action of an initiator ammonium persulfate to obtain a high-molecular polymer, and grafting the surface of the high-molecular polymer with chitosan to obtain the recycling agent. The recycling agent can efficiently recover fine fibers, calcium carbonate, talcum powder, starch, a sizing agent and other papermaking raw materials in the papermaking sludge, lost with circulating water, so the papermaking pulp is saved, the retention rate and the utilization rate of the raw materials are increased, the quality of obtained paper products is improved, and the generation amount of the sludge is reduced, thereby the energy consumption and the cost for sludge treatment are saved, and industrial production is facilitated.

Description

technical field [0001] The invention relates to the technical field of clean production and waste treatment, in particular to a preparation method of a papermaking sludge recycling agent. Background technique [0002] During the papermaking process, with the flow of sewage circulating water, a large amount of fine fibers, calcium carbonate, talcum powder, starch, sizing agent, etc. are lost with the water, and the lost materials will be polluted by anaerobic bacteria in the water body for a long time and become sludge , the formation of solid waste not only wastes a lot of raw materials, but also seriously pollutes the environment. [0003] For the treatment of existing papermaking sludge, most of them adopt filter press landfill incineration or use papermaking sludge to prepare other low-interest sludge boards, etc. The treatment method of filter press landfill cannot essentially eliminate pollution, and incineration will produce A large amount of flue gas causes new pollu...

AI Technical Summary

Problems solved by technology

[0002] During the papermaking process, with the flow of sewage circulating water, a large amount of fine fibers, calcium carbonate, talcum powder, starch, sizing agent, etc. are lost with the water, and the lost materials will be polluted by anaerobic bacteria in the water body for a long time and become sludge , the formation of solid waste not only wastes a lot of raw materials, but also seriously pollutes the environment.

[0003] For the treatment of existing papermaking sludge, most of them adopt filter press landfill incineration or use papermaking sludge to prepare other low-interest sludge boards, etc. The treatment method of filter press landfill cannot essentially eliminate pollution, and incineration will produce A large amount of flue gas causes new pollution. The interest rate of preparing sludge plates is low and sludge cannot be used efficiently, which affects economic benefits and is not suitable for industrial production. What is more important is that the above treatment methods cannot make full use of raw materials for The purpose of making paper, saving costs and improving paper quality

Images