利用转炉烟尘铁粒制造粉末冶金用铁粉

Fabricating Iron Powder for Powder Metallurgical from Iron Particles of Rotary Furnace Soot

转炉在吹炼过程中形成的铁粒 ,经过表面除杂和表面粗糙化处理后 ,其化学成分和粉末工艺性能符合粉末冶金用铁粉的要求。研究发现 ,铁粉松装密度由原始的 3.82 g/cm3 可降低到 2 .72 g/cm3 。当铁粉松装密度为 2 .72 g/cm3 时 ,粉末流速为 2 9.3s/ 5 0 g。该粉末在压力为 4 2 0MPa的条件下压制 ,压坯密度达 6 .6 8g/cm3 ,压坯强度高达 12 .6 8MPa ,比具有相近松装密度的还原铁粉在相同压制条件制的压坯强度提高 4 0 %。铁粉的应用试验结果表明 ,该铁粉的压制和烧结性能良好。

The chemical and processing properties of iron powder, which is formed during steel refining by oxygen blasting, can meet the requirements of metallurgical applications after particle surface modification. It is found that the apparent density of the iron powder can be reduced to 2.72 g/cm3 from its original density of 3.82 g/cm3. The flow rate is 29.3 s/50 g as its apparent density is 2.72 g/cm3, and its compressibility and green strength are 6.68 g/cm3 and 12.68 MPa respectively as it is compacted at 412 MPa. The application tests show that the iron powder particles after the surface modification treatment can be used as a new iron powder source for powder metallurgical applications at a relative low cost. The Fe-Cu-C powder system and the Fe-Ni-Cu-C powder system are taken as examples in the research and analysis.