Surface Chemistry of Deinking Flotation for Improved Wastepaper Recycling

CTS-9215421犹他州大学Jan D.Miller摘要本项目的目的是了解废纸回收用脱墨浮选过程的表面化学，为提高充气水力旋流器在这一应用中的性能奠定基础。脱墨浮选的主要问题，如制浆过程中油墨与纤维表面的分离，油墨因氧化而产生的疏水性差异，油墨颗粒与纤维的互凝，以及油墨颗粒因纤维素纤维的缠绕而被缠绕。在灰渣浮选的最佳操作条件下，再生纸的产量和白度有望增加。有很大的激励措施来增加国内纸张回收的努力。在美国，高达50%的垃圾填埋要求来自纸张和纸制品。除了废物处理问题外，纸张回收还将节约树木、水和能源。

CTS-9215421 University of Utah Jan D. Miller ABSTRACT The objective of this project is to understand the surface chemistry of deinking flotation process for wastepaper recycling as a basis for improving the performance of air-sparged hydrocyclone (ASH) units in this application. Major problems in deinking floatation such as separation of ink from the fiber surface during pulping, differences in hydrophobicity of ink due to oxidation, heterocoagulation of ink particles with fibers, and entrapment of ink particles by entanglement of cellulose fibers will be addressed. Increased yields and greater brightness of recycled paper are expected with optimal operating conditions for ASH flotation. There are significant incentives to increase domestic paper recycling efforts. As much as 50% of the landfill requirement in the United States derives from paper and paper products. Aside from the waste disposal problem, paper recycling will conserve trees, water and energy.