Bidirectional Magnetic Projection: One-Step Separation for Recycling Mixed Wastes,ACS Sustainable Chemistry & Engineering

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Bidirectional Magnetic Projection: One-Step Separation for Recycling Mixed Wastes
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-06-29 , DOI: 10.1021/acssuschemeng.0c02461
Peng Zhao _{1,

2} , Xuechun Zhang _{1,

2} , Fu Gu _{1,

3} , Hao Hu ₄ , Chengqian Zhang _{1,

2} , Jianzhong Fu _{1,

2}

Affiliation

Separating multiple mixed wastes in one step remains a serious challenge because mixtures often have to be separated using a stepwise approach. Bidirectional magnetic projection was thereby developed; the process separates mixed materials simultaneously in a container full of paramagnetic medium by sending the materials from the releasing position to their corresponding landing zones upwardly or downwardly, with the aid of the resultant force of buoyance and gravity and the magnetic force provided by a permanent magnet placed beside the container. A mathematic model of this process was proposed, with drag considered. The validity of the model was experimentally proven, as the calculated trajectories and landing zones are well correlated with the experimental outcomes. The process can separate particles with minor density differences, and a stronger magnetic force increases separation distances. Further, the method was applied to separate simulated plastic wastes and real plastic wastes and to extract aluminum from mixed construction materials. The results show that, in the separation tests, the recovery rates for all materials exceeded 95 wt % with impurities of no more than 5.6 wt %. This approach, which has superior maneuverability and requires no external energy input, achieves the efficient and effective one-step separation of mixed wastes.

中文翻译：

双向磁投影：一步骤分离回收混合废物

在一个步骤中分离多种混合废物仍然是一个严峻的挑战，因为通常必须使用逐步方法来分离混合物。从而开发了双向磁性投影。该过程借助浮力和重力的合力以及永磁体提供的磁力，通过将物料从释放位置向上或向下发送至相应的着陆区，从而同时在充满顺磁性介质的容器中同时分离混合物料放在容器旁边。提出了该过程的数学模型，并考虑了阻力。该模型的有效性已通过实验证明，因为计算出的轨迹和着陆区与实验结果紧密相关。该工艺可以分离出密度差异较小的颗粒，更大的磁力会增加分离距离。此外，该方法还用于分离模拟塑料废物和真实塑料废物，并从混合建筑材料中提取铝。结果表明，在分离试验中，所有材料的回收率均超过95 wt％，杂质含量不超过5.6 wt％。这种方法具有出色的可操作性，并且不需要外部能量输入，可以实现混合废料的高效一步一步分离。6重量％。这种方法具有出色的可操作性，并且不需要外部能量输入，可以实现混合废料的高效一步一步分离。6重量％。这种方法具有出色的可操作性，并且不需要外部能量输入，可以实现混合废料的高效一步一步分离。

更新日期：2020-07-27

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