纸基复合包装中铝塑分离的湿法工艺条件研究  被引量:12

Research on the Wet Process Conditions of the Separation of Aluminum and Plastic in Post-Consumer Aseptic Packages

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作  者:张冀飞[1,2] 闫大海[1] 黄泽春[1] 李丽[1] 李中和[2] 

机构地区:[1]中国环境科学研究院固体废物污染控制技术研究所,北京100012 [2]中国矿业大学(北京)化学与环境工程学院,北京100083

出  处:《环境科学研究》2008年第6期99-104,共6页Research of Environmental Sciences

基  金:国家“十一五”科技支撑计划项目(2006BACO2A13)

摘  要:纸基复合包装中的纸基部分通过水力碎浆分离后可直接用于生产再生纸.其铝塑部分由1层0.02~0.03mm厚的铝箔和2层0.03~0.08mm厚的低密度聚乙烯膜层压复合而成,主要对铝塑的湿法分离进行研究.比较了甲酸、乙酸、盐酸3种剥离剂的分离效果;用甲酸作为铝塑剥离剂时,考察了剥离剂的浓度、反应温度、液固比及破碎尺寸对铝塑分离的影响;根据铝塑分离时间、分离率、铝的损失率等指标,通过正交试验及方差分析优化铝塑分离的工艺条件.结果表明,甲酸分离铝塑的最优条件:剥离剂浓度为4mol/L,反应温度为60℃,液固比为60L/kg,破碎尺寸为5cm×5cm.在该条件下,铝塑的分离率达到100%.The paper part of post-consumer aseptic packaging can be used to produce recycled paper, while the aluminium and plastic parts are composed of low-density polyethylene (LDPE, 0.03-0.08 mm) and aluminum foil (0.02-0.03 Into). This study focused on the separation of aluminum and plastic in post-consumer aseptic packages using a wet process, and compared the different separation degree by methanoic acid, acetic acid and hydrochloric acid. The major variables when methanoic acid was used as the Al-PE separation reagent, such as the separation reagent concentration, reaction temperature, liquid to solid ratio and solid size, were studied. Separation conditions were optimized by experimenting with orthogonal design and variance analysis based on evaluating indicators of separation time, separation rate and mass loss rate of Al. The results showed that the optimum separation conditions of aluminum and LDPE using methanoic acid as a separation reagent were : 4 mol/L of methanoic acid concentration, 60 ℃ of reaction temperature, 60 L/kg of liquid to solid ratio and 5 cm × 5 cm of solid size. The separation rate reached 100% under these conditions.

关 键 词:纸基复合包装 铝塑分离 湿法工艺 正交试验 方差分析 

分 类 号:X79[环境科学与工程—环境工程]

 

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