CN116463874A - 一种废纸表面油墨纤维分离工艺 - Google Patents
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Abstract
本发明公开了一种废纸表面油墨纤维分离工艺,包括:碎浆,将废纸、水混合成纸浆进行粉碎制成高浓浆体;熟化,在高浓浆体加入生物酶与表面活性剂后置于熟化池进行熟化,得到熟化后浆体;浮选,将熟化后浆体置于浮选槽内进行浮选,得到浮选后浆体;成浆,将浮选后浆体洗涤浓缩后得到脱墨浆。本发明采用酶加表面活性剂的复配脱墨体系,辅以高浓水力碎浆机,高效削弱油墨与纤维间的结合力,提高二者分离效率,提高纸浆得率和白度,同时降低脱墨废水中的COD含量,废水处理负荷小,更加环保。
Description
技术领域
本发明涉及造纸工艺技术领域,尤其涉及一种废纸表面油墨纤维分离工艺。
背景技术
废纸回收利用作为二次纤维,它的经济意义将在世界上越来越受到重视,废纸脱墨技术的研究和应用工作的重要性也日益突出。废纸脱墨就是采用高效的脱墨剂和有效的脱墨设备,在适当温度和机械作用下破坏印刷油墨对纤维的吸附,将其与杂质和废纸进行分离。
现在世界上绝大多数工厂都采用碱性法脱墨,碱性法脱墨是在氢氧化钠、过氧化氢、硅酸钠等无机化学品和以表面活性剂为主要成分的脱墨剂的化学作用下,并在机械作用的协作下使油墨从纤维上游离出来而除去。这种方法遇到的难题是必须加入大量的化学品,脱墨成本高,很难进一步降低生产成本;由于NaOH的存在,会从废纸浆中抽提出木素和其他有色物质,使含机械木浆的废纸变黄发黑,易产生“碱性发黑”现象,同时在高PH值下易引起纤维的进一步损伤,从而导致纸张强度的进一步降低,同时会使废水的COD(化学需氧量)增高,污染环境。
发明内容
本发明的目的在于克服现有技术中的不足,提供一种废纸表面油墨纤维分离工艺,采用生物酶与表面活性剂进行废纸脱墨,
为解决上述技术问题,本发明是采用下述方案实现的:
本发明提供了一种废纸表面油墨纤维分离工艺,包括:
碎浆,将废纸、水混合成纸浆进行粉碎制成高浓浆体;
熟化,在高浓浆体加入生物酶与表面活性剂后置于熟化池进行熟化,得到熟化后浆体;
浮选,将熟化后浆体置于浮选槽内进行浮选,得到浮选后浆体;
成浆,将浮选后浆体洗涤浓缩后得到脱墨浆。
优选的,碎浆采用立式高浓水力碎浆机,转速250~350r/min,碎浆时浆体浓度控制为13~17wt%,碎浆时间为40~55min,碎浆温度为40~55℃。
优选的,生物酶为脂肪酶,用量为占绝干浆质量的0.5~0.8u/g;表面活性剂由乙二醇单硬脂酸酯、三乙撑乙二醇单硬脂酸酯与二乙二醇单硬脂酸酯混合而成,乙二醇单硬脂酸酯、三乙撑乙二醇单硬脂酸酯与二乙二醇单硬脂酸酯的质量比为(1~3):(1~3):(1~3),表面活性剂用量为占绝干浆质量的 0.6~1%。
优选的,熟化温度为30~45℃,熟化时间为30~45min,熟化时浆体浓度控制为7~10wt%。
优选的,浮选温度为40~55℃,浮选时间为20~30min。
优选的,还包括稀释,稀释包括:
将熟化后浆体的浓度稀释至1~1.5wt%;
将浮选后浆体的浓度稀释至0.8~1wt%。
与现有技术相比,本发明所达到的有益效果:采用酶加表面活性剂的复配脱墨体系,辅以高浓水力碎浆机,高效削弱油墨与纤维间的结合力,提高二者分离效率,提高纸浆得率和白度,同时降低脱墨废水中的COD含量,废水处理负荷小,更加环保。
附图说明
图1是本发明实施例提供的一种废纸表面油墨纤维分离工艺的流程图;
实施方式
下面结合附图对本发明作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案,而不能以此来限制本发明的保护范围。
如图1所示,本发明实施例提供的一种废纸表面油墨纤维分离工艺,包括如下步骤:
步骤一:碎浆
将废纸、水混合成纸浆装入立式高浓水力碎浆机粉碎,制成高浓浆体。
立式高浓水力碎浆机的转速250~350r/min,碎浆时浆体浓度控制为13~17wt%,碎浆时间为40~55min,碎浆温度为40~55℃。
采用高浓碎浆,增加纤维间的摩擦力、剪切力和揉搓力,使油墨粒子更容易分散游离出来,适当的增加碎浆时间,使废纸疏解和油墨分散的效果更好。
步骤二:熟化
在高浓浆体加入生物酶与表面活性剂后置于熟化池进行熟化,得到熟化后浆体,熟化后浆体的浓度需稀释至1~1.5wt%待浮选。
生物酶为脂肪酶,用量为占绝干浆质量的0.5~0.8u/g;表面活性剂由乙二醇单硬脂酸酯、三乙撑乙二醇单硬脂酸酯与二乙二醇单硬脂酸酯混合而成,乙二醇单硬脂酸酯、三乙撑乙二醇单硬脂酸酯与二乙二醇单硬脂酸酯的质量比为(1~3):(1~3):(1~3),表面活性剂用量为占绝干浆质量的 0.6~1%;熟化温度为30~45℃,熟化时间为30~45min,熟化时浆体浓度控制为7~10wt%。
脂肪酶可以直接攻击(打散)油墨团使之脱离纤维,对纤维损伤小,提高了油墨的去除率,摒弃了碱性法脱墨,增加成浆的得率和白度,强度也较高;表面活性剂的复配体系,用于捕集从纤维上脱离的油墨粒子,并促使油墨进一步脱离纤维获得更好的脱墨效果。
步骤三:浮选
将熟化后浆体置于浮选槽内进行浮选,得到浮选后浆体,浮选后浆体的浓度稀释至0.8~1wt%待成浆。
浮选温度为40~55℃,浮选时间为20~30min。
步骤四:成浆
将浮选后浆体洗涤浓缩后得到脱墨浆,脱墨浆在密封中平衡水分后可抄造成纸页。
综上所述,本发明采用酶加表面活性剂的复配脱墨体系,辅以高浓水力碎浆机,高效削弱油墨与纤维间的结合力,提高二者分离效率,提高纸浆得率和白度,同时降低脱墨废水中的COD含量(约5%),废水处理负荷小,更加环保。
上述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明技术原理的前提下,还可以做出若干改进和变形,这些改进和变形也应视为本发明的保护范围。
Claims (6)
1.一种废纸表面油墨纤维分离工艺,其特征在于,包括:
碎浆,将废纸、水混合成纸浆进行粉碎制成高浓浆体;
熟化,在高浓浆体加入生物酶与表面活性剂后置于熟化池进行熟化,得到熟化后浆体;
浮选,将熟化后浆体置于浮选槽内进行浮选,得到浮选后浆体;
成浆,将浮选后浆体洗涤浓缩后得到脱墨浆。
2.根据权利要求1所述的废纸表面油墨纤维分离工艺,其特征在于,碎浆采用立式高浓水力碎浆机,转速250~350r/min,碎浆时浆体浓度控制为13~17wt%,碎浆时间为40~55min,碎浆温度为40~55℃。
3.根据权利要求1所述的废纸表面油墨纤维分离工艺,其特征在于,生物酶为脂肪酶,用量为占绝干浆质量的0.5~0.8u/g;表面活性剂由乙二醇单硬脂酸酯、三乙撑乙二醇单硬脂酸酯与二乙二醇单硬脂酸酯混合而成,乙二醇单硬脂酸酯、三乙撑乙二醇单硬脂酸酯与二乙二醇单硬脂酸酯的质量比为(1~3):(1~3):(1~3),表面活性剂用量为占绝干浆质量的 0.6~1%。
4.根据权利要求1所述的废纸表面油墨纤维分离工艺,其特征在于,熟化温度为30~45℃,熟化时间为30~45min,熟化时浆体浓度控制为7~10wt%。
5.根据权利要求1所述的废纸表面油墨纤维分离工艺,其特征在于,浮选温度为40~55℃,浮选时间为20~30min。
6.根据权利要求1所述的废纸表面油墨纤维分离工艺,其特征在于,还包括稀释,稀释包括:
将熟化后浆体的浓度稀释至1~1.5wt%;
将浮选后浆体的浓度稀释至0.8~1wt%。
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KR101547509B1 (ko) * | 2014-08-20 | 2015-08-27 | 청운대학교산학협력단 | 복합계면활성제를 이용하여 탈묵 효율을 높인 탈묵제 |
CN107419576A (zh) * | 2017-08-08 | 2017-12-01 | 邓州市华鑫纸业有限公司 | 废纸脱墨再生纸的生产方法 |
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