碱性过氧化物盘磨机械法制浆新工艺

论述了最近开发的，建立在大规模中间试验基础上的碱性过氧化物盘磨机械法制浆工艺、这一新工艺是在过氧化物漂白、木化纤维素的化学性质及磨浆机理的基础上开发出来的。主要包括木片的预处理（P）、盘磨化学处理（RC）及木片经预浸后漂白反应在两者之间的合理分配等。为达到最佳的漂白效率，这一新工艺（P-RC）需要一个比较缓和的预处理，在磨浆化学预处理条件下完成大部分的漂白反应。因为浆料在盘磨机中的停留时间较短，磨浆后需要有高浓停留反应过程，这对盘磨化学法处理非常必要，中间试验的研究结果基本再现了工艺路线的设想：（1）与相对剧烈的预汽蒸相比，缓和的预处理条件有利于提高浆的漂白效率和光学性能。（2）磨浆后高浓反应过程可使浆的亮度提高2-3个百分点。（3）在盘磨法漂白工艺中，缓和的预处理与无预处理相比，具有较好的漂白效果。

A New Concept in Alkaline Peroxide Refiner Mechanical Pulping

A new process concept for alkaline peroxide refiner mechanicalpulping has been developed and investigated in large-scale pilot trial studies. The new process is based on peroxide bleaching chemistry, lignocellulose chemistry and refiner mechanism. It emphasizes preconditioning (P), refiner chemical treatment(RC), and proper distribution of bleaching reactions between the two after the chips being chemically impregnated. To reach an optimum bleaching efficiency, the new process, P- RC, requires a mild preconditioning and completes the majority of the bleaching reactions in the refiner chemical treatment. Because of the very short residence time in the refiner, a certain amount of high consistency retention after refining is required and is a necessary part of the refiner chemical treatment. Pilot trial results were in general consistent with the new concept, and demonstrated: 1) a mild preconditioning gave a higher bleaching efficiency and optical properties compared to a more aggressive thermal treatment; 2)there was a considerable brightness development, 2 ～ 3 points gain, during an interstage high consistency retention; and 3) a mild preconditioning was better than no precondition at all, as in a refiner bleaching process