共查询到19条相似文献,搜索用时 156 毫秒
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当前我国电缆工业“废杂铜的直接再生制杆”和“以铝节铜”已成为关注的“热点”。整个行业铜线的质量在下降,致使线缆产品的合格率大幅下降。铜包铝线和铜包钢线的用量正在逐步攀升,但“以铝节铜”的产品方向和在技术经济上的可行性在某些领域供、需双方还未取得共识和可行的结论。文章就废杂铜直接再生制杆、以铝节铜的现状、问题和建议进行论述,以期这两大热点向良性循环的方向发展。 相似文献
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铜包铝线是线缆行业贯彻“以铝节铜”方针,创建资源节约型社会战略目标的重要材料。要使铜包铝线真正发挥“以铝节铜”的效果,首先必须生产出满足《铜包铝线》(GB/T29197—2012)国家标准中所规定的力学性能、电学性能及其他物理化学性能的产品。 相似文献
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在铜资源严重缺乏的情况下,电缆行业“以铝代铜”无异于一场材料革命。在欧美等发达地区,性价比更高、电气性能优越的铝合金电缆已被成功应用了40多年,国内的一些新建工程也开始尝试使用铝合金电缆。本文对铝芯电缆、铜电缆和铝合金电缆的性能进行了分析,并具体阐述了铝合金电缆在住宅配电系统中的适应性,指出了选用铝台金电缆需要注意的问题,客观地看待铝合金电缆的使用问题。 相似文献
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易拉罐是一种常用的消耗品,用过即废,循环周期很短。而易拉罐所用材料是一种档次较高的铝合金,回收价值高,可多次重复循环使用。同时,回收利用易拉罐可以节约大量电力,用废铝生产铝材所耗的电仅相当于从矿石中提炼铝耗电量的5%, 相似文献
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再生铝外延广泛,但狭意的再生铝通常指以废铝为原料生产的各种铸造铝合金产品,其原料、工艺、设备、产品及应用不同于电解铝,具有节能、环保等特点,受到了世界各国政府的普遍支持,国际再生铝在铝工业所占的比例达到50%以上。我国因电解铝扩张太快,再生铝所占比例反而有所回落,2006年仅为21%,再生铝在我国虽然还很年轻,但发展潜力巨大。 相似文献
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再生铝是铝工业可持续发展不可缺少的资源。与原铝生产相比,废铝再生利用可节省水电等能源达95%,对环境的污染也大大降低,而且还可以降低铝合金制品的生产成本,具有良好的社会效益和经济效益。因此,再生铝利用已成为世界各国重点发展的技术领域之一。全世界每年有近1200万t废杂铝被加工成再生铝合金, 相似文献
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Huang Chongqi 《中国工程科学》2008,10(3):2-11
The copper consumption by the Chinese Cable Industry amounted to 3.54 million tons in 2006, taking over 70% of the total copper consumption in China in that year. At present, making copper rod directly from recovered scrap copper and saving copper with aluminium have become topics of general interests in the Chinese Cable Industry. The quality of the copper conductors in the Industry is declining, resulting in sharp decrease in the rate of qualified wire and cable products. More and more copper wires are drawn from the rods made directly from scrap copper. The manufacturers know well some of the wires or rods are unqualified products though, they continue to use or produce products not complying with standards in order to make profits. Now the consumption of copper-clad-aluminum and copper-clad-steel is growing gradually. In 2006, the consumption of copper-clad-aluminum in China amounted to ca. 50 000 tons. But in some applications, neither the common understanding between buyer and supplier nor the results of feasibility study are achieved in the product orientation and technical/economic feasibility in terms of saving copper with aluminium. This paper presents the status-quo, problems arisen and suggestions in terms of making copper rod directly from recovered scrap copper and saving copper with aluminium, in a view to promote these two topics of general interests to go toward a virtuous circle. 相似文献
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V. V. Satya Prasad A. Sambasiva Rao Ujjwal Prakash 《Materials and Manufacturing Processes》2001,16(2):209-217
An electro slag crucible melting process for production of copper-chromium alloys is described. The process uses fine copper scrap as a raw material. After the copper scrap is melted, chromium is alloyed with copper by direct reduction of chromium oxide added to the slag. Carbon and aluminum can be used as reductants and the reduction is carried out in situ in the molten slag. Copper chromium ingots containing up to ∼1 wt % chromium were produced by this process. The process serves the dual purpose of recycling copper scrap and alloying remelted copper by chromium. This is the first time that direct reduction has been employed during an electro slag melting process. The in situ reduction technique described has the potential of being a production route for a variety of alloys. It is particularly suitable for production of difficult-to-melt alloys such as copper-chromium. 相似文献
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提出采用一种铜铝复合管,用来替代传统的空调室外机换热器用铜管,可降低成本27.8%。首先通过数值模拟研究了Φ7管径的铜铝复合管与铜管翅片管换热器空气侧的传热与流动性能,计算结果表明,在入口风速为2.5m/s的情况下,与采用铜管的换热器相比,采用铜铝复合管的换热器空气侧的压力分布几乎不变,换热量降低3.12%,对性能影响较小。另一方面,对采用该模型的铜铝复合管换热器进行了性能测试,实验结果表明:铜铝复合管换热器换热量为8775W,与铜管换热器9101W相比降低3.58%,满足换热器标准要求。实验结果与数值模拟结果基本吻合,均证明这种新型铜铝复合管对换热器性能的影响不大,可用于空调的制造中。 相似文献
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根据理论分析和计算,讨论了包覆拉拔法铜包铝、铜包钢双金属线材固相结合的物理和化学原理;根据实验结果和分析,讨论了包覆拉拔法铜包铝、铜包钢双金属线材固相结合的金属学机理;有利于完整地认识在压力作用下双金属的固相结合理论。 相似文献
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S. Tzamtzis H. ZhangM. Xia N. Hari BabuZ. Fan 《Materials Science and Engineering: A》2011,528(6):2664-2669
Strict government regulations and environmental concerns are the driving forces behind the increased use of magnesium alloys aimed at weight reductions. This however inevitably leads to increased magnesium alloy scrap and calls for effective recycling processes. In this paper, the melt conditioned high pressure die casting (MC-HPDC) process has been investigated as a physical approach for the recycling of AM series magnesium alloy die casting scrap. Process optimization was required to eliminate hot cracking phenomena. The experimental results showed that intensive melt shearing alters the size and morphology of MgO present in the scrap melt, leading to an effective grain refinement that was reflected in the mechanical properties of the recycled alloy. The MC-HPDC process showed excellent potential as a physical recycling approach for Mg alloy scrap, producing casting with properties comparable to those of fresh Mg alloys. 相似文献
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Hong Tao Gao Guo Hua Wu Wen Jiang Ding Yan Ping Zhu 《Journal of Materials Science》2004,39(21):6449-6456
A new flux was developed specially for recycling of scrap magnesium alloy AZ91 with high iron content. JDMJ in the flux could effectively remove inclusions from the recycled magnesium alloy and its proper addition was about 2.0 wt%. Excessive addition of the flux would result in flux inclusion in the recycled magnesium alloy. B2O3 in the flux made the iron concentration in the scrap magnesium alloy decrease from 0.044 wt% to about 0.002 wt% during recycling and its optimal addition was 0.3 wt% by Gaussian Fitting. The tensile properties of the recycled magnesium alloy were greatly improved by about 35%. Weight loss measurement, potentiodynamic study and pitting morphology examination revealed that the corrosion resistance of the recycled magnesium alloy was also greatly improved. The mechanisms of inclusion removing and iron reducing in the scrap magnesium alloy during recycling were discussed thermodynamically and formation of FeB was confirmed as the main reason for iron reducing in the recycled magnesium alloy AZ91 by XRD analysis. 相似文献
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