A sustainable technique for conversion of end-of-life tyres (ELTs) to products with added value is of a great importance for resource-efficient circular economy. However, obtaining products with added value often requires multi-stage procedures, which include traditional and emerging technological approaches. In current paper, the authors suggest an efficient approach for recycling of ELT tyres, obtaining products which can be subsequently used for environmental applications. This approach introduces a synthesis path for new material by transformation of industrial wastes i.e. ELT rubber wastes to crumb rubber and further mixing with iron powder. Particular attention is driven to perspective processing of obtained crumb rubber-iron powder mixture by means of microwave pyrolysis for synthesis of carbon-iron powder mixture and its use as a composite absorbent material along with emerging application for electromagnetic and microwave irradiation protection.