高效排杂熔剂过滤净化工业纯铝

Purification of commercial aluminum by filtrating with high-efficient flux for removing inclusions

探讨了熔剂过滤净化工业纯铝的效果及其净化机理。结果表明 :合适的熔剂组成及处理工艺是保证其具有高效排杂作用的关键 ;采用特定的熔剂 (CJ 5 )和过滤工艺 ,在适当的加入量 (3% )和熔炼温度 (72 0℃ )条件下 ,对不同品位纯铝的除杂率和针孔率降低幅度分别可达 70 %～ 82 %和 6 0 %～ 88% ,显著提高了材料的强度和塑性 ,尤其是塑性可提高约 70 % ;其高效排杂作用的关键在于该方法具有将铝的熔化—熔剂过滤—熔剂吸杂溶杂三个过程实现于熔炼全过程中的独特性 ,符合以排杂为主的净化原则 ,充分发挥了熔剂排杂净化效率。

The purification of commercial aluminum by filtrating with high efficient flux for removing inclusions and its mechanism were studied. It is found that combining reasonable flux components with purification technology is the key to ensuring its effect of removing inclusions high efficiently from molten aluminum. With special flux (CJ 5) and filtration technology, and proper addition amount (3%) and melting temperature (720?℃), the rate of removing inclusions and the extent of lowering porosity for different grades commercial aluminum could amount to about 70%～82% and 60%～88% respectively, and the mechanical properties of this material were improved remarkably, especially the relative increase of elongation ( δ ) was about 70% in comparison to that of no filtration. The main reason of removing inclusions high efficiently for this method is that it can make three processes—melting, flux filtration and adsorbing inclusions with activated flux be fulfilled simultaneously in the whole course of melting of aluminum, which accords with the purification principle that more attention should be firstly paid on removing inclusions, thus giving full play to the purification efficiency of the flux.[