| 摘要 |
<p>863,846. Recovering metal from rubberbonded metal articles. HOLMES & CO. Ltd.. W. C.. ANDRE RUBBER CO. Ltd., BROOMHEAD, F., and PRIESTLEY, J. J. April 26, 1957 [April 28, 1956]. No. 13111/56. Class 82(1) [Also in Group XII] Rubber is debonded from metal articles, such as insulated copper cables, by heating the articles in the absence of oxygen to a moderate temperature, for example 445-455‹C. to decompose the rubber into gaseous products and a carbon residue which is subsequently removed by mechanical agitation from the surface of the articles. As shown, the rubber-bonded metal parts are loaded into bucket 12, at ground level, and placed inside the gas fired furnace 13 by means of the block 11 and gantry 11a. The cover 13a is clamped to the furnace which is heated to about 450‹C. in the absence of air (an inert atmosphere such as nitrogen or steam may be used) and the rubber is carbonized evolving gases from which tar is condensed at 15 and collected at 16, the gaseous products being burnt in the flue 17. After heating, the basket 12 is removed from the furnace and the metal parts are treated on the screen 20 to remove most of the surface carbon, withdrawn at 22 and cleaned by abrasion in a rotary barrel containing a liquid and soft stone chips. In a modification a gas holder is arranged in the system to receive all or part of the gas evolved during carbonization, a by-pass being provided around the holder and means for passing the carbonization gas to a burner or to the fuel gas system for the furnace to provide at least part of the heat requirements of the process. In a further modification a motor driven fan circulates gaseous carbonization products within the furnace to facilitate heat transfer between the furnace walls and the metal parts in the basket 12.</p> |
