| Our country has great consumption capacity in Al, Cu and other nonferrous metals. We have to import large amount of ore for smelting production of Al and Cu every year in order to meet resource requirements of national economy. Related companies form large amounts of Al, Cu and other alloy scrap every year, its purification and regeneration have very important significance. Therefore, this paper carried out the research about purifying technology of Al-Cu alloy scrap.The content of Al and Cu in Al-Cu alloy scrap for experiment is up to 80%, and the alloy contains large amounts of Fe, Si, V and other impurities. The presence of impurities greatly worsen the performance of Al-Cu alloy. Because of still no effective means to handle this part of the alloy scrap, enterprises can only use it as waste. This situation not only greatly increases production costs and reduce the economic efficiency of enterprises, which is not conducive to long-term development, but also causes the profligacy of Al, Cu and other non-ferrous metal resources. This profligacy becomes more prominent especially at the background of China’s energy and resource shortage. Therefore, by using a reasonable method to reduce impurities in Al-Cu alloy waste and make that Al-Cu alloy can be recycled,it has a very important practical significance.In this thesis, we studied factors such as the filter plate material, temperature, shielding gas type and flow rate, and discoverred optimum conditions by using experimental device which was designed by ourselives. We want to reduce impurities in the alloy by studying, so that it can be recycled. This method is green, simple, obvious effective, and applicable to industrial large-scale production.We developed a kind of Al2O3-based ceramic foam and studied influences of different MgO doping and sintering temperature on the properties of ceramic foam. Their strength and porosity are higher than those of the commercially available products.We get the following conclusions through experimental study:1. Density of the experimental Al-Cu alloy at 750℃,800℃and 850℃ has been obtained by experiment. Its density is 3.8g/cm3 at 750℃,3.27 g/cm3 at 800℃, and 3.04 g/cm3 at 850 ℃. The corresponding static head is 37.60cm,30.52cm and 23.23cm.2. Through experiments we get filtering capability of Al2O3 foam ceramic filter plate with a thickness of 20mm and 10 ppi porosities is 3821.65 kg/m2.3. The optimum conditions for filtration experiments of Al-Cu alloy is getten. Using Al2O3 ceramic foam filter plate of 20mm thick and 10 ppi porosities, and using 2 L/min Ar flow protection at the same time, we can get the best result at x2℃.4. After the experiment using 20 kg raw materials, the first proportion of removal of Fe, Si, V is 75%,34%,41% respectively, and recovery is 74.1%. The secondary proportion of removal of Fe, Si, V is 83%,40%,55% respectively, and recovery is 59%.5. Al2O3 ceramic foam filter plate with x7% MgO doped, which is sinterred at x9℃, has high intensity and large porosity. Its intensity, which is 0.89MPa, is 2.34 times more than the products of market. And its porosity, which is 87.49%, is 1.02 times more than the products of market. The number of thermal vibration reaches 17 cycles from 800 ℃ to room temperature. |
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