Study On Deinking Of Office Waste Paper And Magazine Paper

With the development of technology and economic, it is short of forest resources and the environment is polluted. People have a high demand on the quality and quantity of papers, which improve the technology of deinking. By deinking, raw material and pollution can be saved, and it is significant in reducing costs and energy consumption .The paper focuses on the deinking of office waste paper and magazine paper.It was researched of deinking of office wastepaper and magazine paper. The best formula of office wastepaper is: non-ionic surfactant: AOS = 4:6, the whiteness value is 88.64%, the whiteness of the import agent value of deinking agent 79.23%. The best formula of magazine paper is: non-ionic surfactant: AOS = 1:1, brightness value is 80.4%, the whiteness value of the import agent is76.83%.In deinking of office wastepaper and magazine paper the contact angle and surface tension showed the same trend in deinking slurry of a single-component surfactant or two. And if contact angle and surface tension were small, the whiteness will small too.The best deinking conditions of office wastepaper: Deinking dosage: 0.3%; pulp concentration: 3%; pulping time: 2min; pulping temperature: 60℃; aging time: 60min; flotation concentration: 1%; flotation time: 10min; flotation temperature: 60℃; Sodium: 3%; sodium hydroxide: 1.5%; hydrogen peroxide: 2%; EDTA: 0.2%.The best deinking conditions of magazine paper is: Deinking dosage: 0.3%; pulp concentration: 3%; pulping time: 0.5min; pulping temperature: 60℃; aging time: 50min; flotation concentration: 1%; flotation time: 10min; flotation temperature: 60℃; Sodium: 3%; sodium hydroxide: 1%; hydrogen peroxide: 1%; EDTA: 0.4%.The best formula of mixed waste paper was received and the whiteness value can reach 48.44%, improved 11.75%; the whiteness value of import deinking Agent is 36.57%, increased 5.55% in value. Before and after deinking fiber morphology can be showed by scanning electron microscope.