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由氢氧化钠+过氧化氢+硅酸钠转变成氢氧化镁+过氧化氢漂白机械浆具有明显的经济效益。采用氢氧化镁+过氧化氢漂白预热木片磨木浆产生废水COD/BOD负荷较低、纸浆得率较高和解决了草酸盐结垢等等。North pacific造纸公司研制出这种漂白新技术已用于生产预热木片磨木浆工厂。由于在磨浆过程中添加氢氧化镁+过氧化氢,在高温和高浓度下使浆料和漂白化学品很好混和,提供过氧化氢极佳的漂白反应,添加氢氧化镁+过氧化氢到磨浆系统,使磨浆所需能量降低100~200kW.h/t浆,并可提高纸浆强度5%~10%。 相似文献
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使用内蒙小美旱杨进行了过氧化氢漂白化机浆两段浸渍制浆研究。碱性H2O2两段浸渍工艺可以大幅度降低磨浆能耗,提高浆料强度性能,实现制浆与漂白同步完成并达到高白度;纸浆的强度指标与浸渍处理的用碱量有关。适宜浸渍工艺条件(H2O26%,NaOH 6.4%)纸浆质量可以达到如下质量指标:抗张指数为7.24 N·m2/g,耐破指数为4.19 kPa·m2/g,撕裂指数为4.60 mN·m2/g以上,白度83.8%ISO,不透明度76.1%。磨浆能耗仅1130kWh/t。后续补充2%H2O2常规漂白,可使纸浆白度达到87%ISO以上。H2O2用量与纸浆白度之间存在线性相关,回归方程为:Y=6.55X+45.5(R=0.99,SD=1.52,P=0.01)。 相似文献
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对木聚糖酶预处理麦草碱法化学机械制浆进行了研究。结果表明,在适宜的条件下,木聚糖酶预处理可以降低磨浆能耗,提高麦草碱法化机浆的抗张强度和撕裂强度,增加纸浆的白度。 相似文献
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研究了碱性过氧化氢预处理热磨机械浆(TMP)浆渣的效果。结果表明,当总碱为5.2%时,碱性过氧化氢预处理使磨浆的单位能耗降低了20%,并符合所要求的游离度,还提高了纸张的紧度和抗张强度;预处理的不利方面是光散射系数和纸浆得率有所下降。 相似文献
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桉木碱性过氧化氢机械浆的研究 总被引:1,自引:0,他引:1
本文对雷林一号桉和巨尾桉碱性过氧化氢机械浆(APMP)的预处理工艺条件及制浆过程中各种主要化学组份的变化进行了研究。在本论文实验条件下,用20%的巨尾桉APMP与60%的马尾松磨木浆、5%的马尾松亚硫酸盐化学浆以及15%的脱墨废纸浆配抄的新闻纸的白度、裂断长、撕裂指数及不透明度可符合GB1910-89B级新闻纸的要求。 相似文献
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对中浓打浆技术及设备在国内研究及生产应用的发展史进行了叙述,探讨中浓液压单盘磨和中浓液压双盘磨的研发背景、设备特点、配套中浓打浆工艺及生产应用效果。结合国内造纸行业的发展趋势,对中浓打浆的应用前景进行了评估。 相似文献
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针对目前广泛使用的力学式纸浆浓度传感器测量精度较低的问题,通过研究纸浆纤维结构和力学式纸浆浓度传感器测量原理,发现了这种传感器测量精度较低的原因:第一,纸浆浓度测量信号中噪声信号难以滤除;第二,纸浆流速对纸浆浓度测量影响较大。为此,在研究纸浆浓度测量信号中噪声信号及其性质并建立纸浆浓度传感器测量模型的基础上,提出了利用稀疏分解消除纸浆浓度测量信号中各种噪声信号,同时利用纸浆浓度传感器测量模型对纸浆浓度测量值进行流速补偿。结果表明,该方法能够显著提高纸浆浓度传感器的测量精度。 相似文献
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Pasting characteristics of native as well as of physically and chemically modified rye starches have been characterized and compared with the other triticeae starches and starches from maize and potatoes. Normal and pressure viscograph techniques were applied. Additional, ridgelimetry investigation were performed with the gels formed from the viscographically prepared pastes. Rye as well as wheat and triticale starches exhibit unique, typical gelatinization behaviour, late onset of consistency gain, low but highly stable cooking consistency, consistency gain of the two-threefold on cooling. Gels are of statistically lower firmness as those of maize starch. Higher degrees of consitency, good cooking stability and high consistency gain on cooling were achieved after treatment in the pressure viscograph (max. temp. 120°C). Physical treatment like annealing, heat-moisture treatment, extraction by aqueous solvents, drying procedures result in different but in each case typical change of properties: shift of onset consistency gain, lower maximum consistency values, lower consistency gain on cooling. Gelfirmness will be enhanced in every case. The pasting characteristics of heat-moisture treated wheat starch differ from this by remarkably higher consistency values. Possible reasons for this are discussed. Succination (0.7-2.1%) changes the pasting characteristics towards the potato starch type, lower onset temperatures of consistency gain, very high values in maximum consistency, diminished cooking stability. The gels formed are smooth and turbid. Acetylation (0.7-2.3%) changes the pasting characteristics towards the maize starch type, maximum consistencies are lower compared with succinated triticeae starches. Ac contents of 0.7% inhibit the formation of rigid gels. 相似文献
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The effect of three independent fermentation variables: demineralized whey powder (0.0; 1.5 and 3.0%), lactic culture concentration (1.0; 2.0 and 3.0%) and mix treatment temperature (85; 90 and 95°C) was studied. Fermentation time to reach pH 4.3, instrumental consistency and appearance, visual consistency and taste of the product were evaluated. Product consistency increased as mix treatment temperature increased and demineralized whey powder decreased. The powder had a stronger influence on instrumental consistency than did temperature. Appearance was better when whey powder was used at 1.4 to 1.6%. Visual consistency decreased as whey powder increased but addition of demineralized whey powder did not negatively affect yogurt flavor. 相似文献