| 摘要 |
<p>It is the objective of the present invention to provide a method for recovering metal and/or metal compounds which are bound in polymer materials, such as in the polymer materials of a PEM fuel cell, which can be processed at rather low cost and at volume scale. This objective is achieved by a method for recovering metal and/or metal compounds which are bound in polymer materials, such as PTFE, Nafion®, gas diffusion layers, electrodes, polymer electrolyte membranes, comprising the steps of:
a) irradiating the polymer material with ionizing radiation, under determined conditions with respect to an irratiating profile which defines at least one of irradiation pattern, irradiation energy, irradiation intensity;
b) soaking of the irradiated polymer material in a liquid solving agent;
c) filtering the solid non-polymeric contents from the liquid solving agent; and
d) recuperating by appropriate chemical and/or physical processes the metal and/or metal compounds from the filtered non-polymeric solids. The irradiation therefore yields to significant break of the strength of the polymer materials. This decomposition releases the metal and/or metal compounds from their strong embedding in the polymer The strong attachment between the polymer and the catalyst does not exist any longer or which exist only to a very limited extent after the irradiation step. By soaking and leaching the irradiated metal and/or metal compounds polymer specimen in a liquid solvent it is possible to free the metal and/or metal compounds from the polymer structure and recuperate the metal and/or metal compounds.</p> |
