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Zinc Regarding the Utilization of Waste Tires by Pyrolysis

机译：关于热解利用废轮胎的锌

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The major goal of our study was to demonstrate how to eliminate zinc from the products of waste tire pyrolysis and avoid its environmental circulation. The new tire utilization manner consists of a separate combustion of the pyrolytic char containing 5.1 wt. % zinc and a collection of such obtained ash (10.4% yield) that contains 42 wt. % of zinc. The ash is a good candidate for metallurgical recovery of metallic zinc. The study demonstrates that pyrolytic char, because of its very low BET surface area of 43-60 m(2)/g, should not be transformed into activated carbon. High surface areas reported in literature (800-910 m(2)/g) for some pyrolytic chars were achieved after a complex and expensive activation process. Moreover, the study proved that zinc derivatives in tire-driven pyrolytic chars could be released to the environment since they were partly leached in H2O and etched in 0.1 M HCl solution. The study demonstrates that zinc can be eliminated from environmental circulation during tire pyrolysis and proposed an alternative solution to the transformation of pyrolytic char into activated carbon.
机译：我们研究的主要目的是证明如何消除废轮胎热解产物中的锌并避免其环境循环。新的轮胎利用方式包括单独燃烧含有5.1 wt。％的热解炭。 ％的锌和收集到的这样的灰分（10.4％收率），其包含42wt。％的锌。锌的百分比。灰分是金属锌的冶金回收的良好选择。研究表明，热解炭由于其非常低的BET表面积为43-60 m（2）/ g，因此不应转化为活性炭。在复杂而昂贵的活化过程之后，获得了一些热解炭的文献报道的高表面积（800-910 m（2）/ g）。此外，研究证明，轮胎驱动的热解炭中的锌衍生物可以部分释放到水中，并在0.1 M HCl溶液中蚀刻，因此可以释放到环境中。研究表明，在轮胎热解过程中可以从环境循环中消除锌，并提出了将热解炭转化为活性炭的替代解决方案。

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