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Recuperação de compostos clorados e energia a partir de resíduos contendo PVC

Os resíduos são considerados uma fonte atrativa para a produção de energia, principalmente os de base polimérica. Várias são as técnicas de valorização térmica e energética, como a pirólise, que constituem alternativas com elevado potencial no que concerne à produção de combustíveis alternativos e energia. Estas técnicas, quando aplicadas a resíduos, favorecem a formação de produtos com valor acrescentado. A ut...

Energetic valorisation of PVC-containing waste

Wastes are increasingly regarded as important sources of energy, particularly their polymeric component. However, most of these wastes contain polyvinyl chloride (PVC) in their composition, constraining the use of a thermal valorization process in their treatment [1]. This work aims the development of a process for the material and energetic valorization of the PVC-containing wastes. A two-step process was firs...

Projecto PVC4GAS : valorização material e energética de resíduos com PVC

Study of a two steps process for the valorization of PVC-containing wastes

Published online 27 November 2012 ; The presence of organic compounds in wastes, namely polymer based compounds, is considered a potential relevant source of energy. However, the presence of polyvinyl chloride (PVC) in their composition, causes recycling problems when a thermal process is considered for the wastes treatment [1] preventing its use on processes which the main goal is the energy recovery (Zevenho...

Kinetics of thermal de-chlorination of PVC under pyrolytic conditions

Although PVC-containing wastes are an important potential source of energy they are frequently disposed in landfill. In thermal treatment processes such as pyrolysis and gasification, the presence of poly(- vinyl chloride) (PVC), a compound with 56.7% of chlorine, may cause problems concerned with environmental protection, as consequence of the formation of hydrochloric acid, chlorine gas and dioxins, as well a...

Desenvolvimento e caracterização de latões ecológicos

O chumbo é um elemento de liga normalmente presente na composição química dos latões conferindo-lhes boa maquinabilidade. Todavia, sendo um elemento tóxico, a sua presença é possível fonte de contaminação de águas, com eventuais danos para a saúde pública e para o ambiente. Por essa razão, a legislação publicada em vários Países tem vindo a demonstrar a sua preocupação neste domínio, restringindo ou eliminando ...

Production of metallic nanoparticles, from industrial residues, by the use of d...

The need to enhance and reuse existing materials on secondary sources of metals has had quite an impact in recent times. Several processes and technologies had being studied for recovery of raw materials from industrial waste generated. This study focuses on the possibility of waste reducing, from the galvanic floor covering industry, with the aim of obtaining micro or nano-particles of nickel or a nickel based...

Comparative study of the tarnishing resistance of several coloured base gold al...

The stability of coloured gold alloys may be dependent on the environment that involves them. This paper is concerned with the effect of an artificial sweat solution in the stability of several gold base alloys with different colours. The changes in the samples physical properties, colour, brightness, and reflectance were measured for several periods of immersion. Two types of alloys (purple and blue coloured a...

Kinetic study of thermal de-chlorination of PVC containing waste

With the increasing of plastics content in solid waste, both municipal and industrial, also increases the interest in its use as an energy source. Some of these wastes are an important potential source of energy and might be valorized using the pyrolysis or gasification processes. However, the presence of high chlorine contents in its composition prevents its management by a thermal process, as consequence of t...

Recycling of aluminium swarf by direct incorporation in aluminium melts

The purpose of this work was to recover a standard AlSi12Cu1 alloy from machining chips inside the foundry plant, by using an environmentally friend technique to produce cast ingots with characteristics similar to those of the commercially available 2nd melt raw material. The recyclability of aluminium swarf using different melting techniques and the influence of chips preparation in the aluminium alloy recover...