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Environmental and technological assessment of recycling exchanged zeolithic tuff

机译：回收交换沸石凝灰岩的环境和技术评估

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摘要

In this paper Cd~(2+), Cr~(3+) and Pb~(2+) exchanged tuff has been used in mixtures with lime and gypsum in order to assess the potentiality of this type of binding system for the manufacture of pre-formed building elements. Exchanged zeolitic tuff can be obtained as a solid waste from ionic exchange processes of industrial acid wastewaters containing heavy metals. This type of treatment can be a cheaper alternative to traditional precipitation processes and this work has the scope to assess the feasibility of recycling the exchanged tuff from both the technological and environment al pints of view. Experiments were carried out to study the effect of the above hcavy metals on the hydration behaviour and mechanical strength of the hardned products.
机译：在本文中，将Cd〜（2 +），Cr〜（3+）和Pb〜（2+）交换凝灰岩与石灰和石膏的混合物一起使用，以评估这种类型的结合系统在制造胶束中的潜力。预成型的建筑元素。可以从含有重金属的工业酸性废水的离子交换过程中，以固体废物的形式获得交换的沸石凝灰岩。这种处理方式可以比传统的沉淀方法便宜，并且这项工作的范围是从技术和环境角度评估回收交换凝灰岩的可行性。进行实验以研究上述卵形金属对硬化产物的水合行为和机械强度的影响。

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