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介绍碱法草浆黑液采用膜技术处理的各种方案,着重介绍了碱法草浆黑液资源化全回收技术并提出了新的技术方案,该方案是先用硫酸中和酸析黑液中的木质素,或用纳滤方案回收木质素,然后采用双极膜电渗析法回收已去除木质素的黑液中的酸和碱,最后经蒸发和喷雾干燥回收其中的糖、其他营养成分及大部分水,达到无污染排放的目的。该方案碱回收率在50%~80%,取决于黑液中碱的浓度,回收1 t碱的耗电量低于2 500 kW.h。该法的基本投资比同规模碱回收法节省60%以上,具有较好的经济效益。 相似文献
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-In order to reduce the increasingly serious environmental impact caused by wastewater from the paper industry, the municipality of Jinan plans to adopt a specialized production technology. The new technology will centralize pulp production and decentralize paper production. It is predicted that the new technology will greatly reduce the environmental effects of the paper industry. Perhaps it is a new direction for the development of the paper industry in China. 相似文献
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采用真空吸滤和挤压过滤两段组合式提取装置两次提取麦草浆黑液,能获得高且稳定的黑液提取率。探讨了黑液提取率与浆料洗涤时间、水量的关系及洗后浆所达到的洗净程度等。 相似文献
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在碱法制浆过程中同步除硅──中型试验 总被引:2,自引:0,他引:2
在制备高硅含量原料的碱法蒸煮液时,把一种主要成份为氧化铝的除硅剂加到配碱槽内(或直接加到蒸煮锅内),通过蒸煮,该除硅剂能与原料中硅生成不溶物附着在浆料上,达到降低黑液硅含量的目的。此方法适用于各种碱法制浆过程,对于麦草硫酸盐法,除硅剂用量为原料的2.5%时,黑液除硅率可达到90%以上。通过18×40m3蒸球的中型试验证实,本方法不仅能有效地除硅;还能显著地改善黑液有关蒸发、燃烧的粘度和膨润容积系数(VIE)等理化性质,且对浆料质量及后续制浆、造纸操作无不良影响,对实现稻、麦草碱回收有十分重要的现实意义。 相似文献
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The principle and technique were reported here to produce lignin-based sand stabilizing material (LSSM) using extracted lignin fromblack liquor of straw paper mills. Field tests using LSSM to stabilize and green sand dunes were started in 2002. The field experimentwas carried out in August 2005 when the newly formed plant community was 3 years old. The results from the comprehensive fieldexperiment demonstrated that unlike polyvinyl acetate or foamed asphalt commonly used for dune stabilization, LSSM was plantfriendlymaterial and could be used in combination with seeding and planting of desert species. With the help of LSSM, the desertspecies (i.e., Agriophyllum squarrosum (L.) Moq. and Artemisia desertorum Spreng. etc.) could be used to form community in 2–3yeas and to stabilize sand dune e ectively. The newly formed community was sustainable under an extremely dry climate condition.The organic matter and total nitrogen in the soil increased significantly as the community were formed, while the change in P and Kcontents in the soil was negligible. 相似文献
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通过热重分析实验和固定床热解实验研究了麦草碱性亚硫酸钠-蒽醌法制纸桨黑液固形物的热解特性和热解产物分布。结果表明:黑液固形物热解过程分为干燥脱水、有机物热解和无机物转化三个阶段,主要失重发生在200~550℃间;在热重分析基础上按一级反应动力学模型得到了黑液固形物热解各阶段的动力学参数;实验条件下,麦草浆黑液固形物固定床热解后约三分之一转化为挥发分,余下为固体残渣。 相似文献
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用3,5-二水杨酸法测黑液里还原糖含量。通过正交试验法,探讨了黑液质量分数、反应温度、硫酸质量分数及搅拌时间对黑液酸析前后还原糖去除率的影响,得出的最佳工艺条件是:黑液质量分数为10%.反应温度为700℃,硫酸质量分数为10%,搅拌时间35min。 相似文献
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采用不同的吸附剂对木浆造纸黑液酸析木质素后的滤液进行吸附处理研究,并测定其CODcr去除率和脱色率。对滤液原料(2#)的吸附工艺条件进行了考察。结果表明,在四种吸附剂中,粉末活性炭的吸附性能最好。采用粉末活性炭作为吸附剂处理滤液原料(2#)较好工艺条件为:用量为6 g,吸附时间为2.5 h~3 h,吸附温度为60℃。 相似文献