涡流贫化法回收铜渣中的金、银、铜

Recovery of Au, Ag and Cu from Copper Slag by Vortex Dilution Method

摘要:

在火法炼铜过程中产生大量的含铜废渣，伴随铜渣排放的还有金和银。为了合理回收铜渣中的金、银、铜，提出了涡流贫化法回收铜渣中的金、银、铜的新工艺。采用熔融铜渣为原料，经过涡流贫化过程，回收铜渣中的金、银、铜，贫化渣进一步升温还原得到含铜铁水，最终可制备成耐磨铸铁。结果表明，通过涡流贫化，铜渣中的Fe3O4被还原为FeO，然后FeO与SiO2结合，生成Fe2SiO4。经过涡流贫化后，金、银、铜的回收率分别达到了99.44%，93.97%，和93.14%。贫化渣中Fe3O4和铜的含量分别为1.53%和0.61%。贫化渣涡流还原后得到的含铜铁水制备的耐磨铸铁成分满足高铬耐磨铸铁国标要求。

Abstract:

In the process of copper smelting, a large amount of copper slag is produced and gold and silver are discharged along with copper slag. In order to reasonably recover gold, silver and copper from copper slag, a vortex dilution method was proposed. The molten copper slag was used as raw material, the gold, silver and copper in copper slag were recovered through the vortex dilution process, and the diluted slag was further reduced to produce copper-containing molten iron, which could finally be prepared into wear-resistant cast iron or copper-containing antimicrobial stainless steel. The results showed that Fe3O4 in copper slag was reduced to FeO by FeS and then FeO combined with SiO2 to form Fe2SiO4. After vortex dilution, the recovery rates of gold, silver and copper reached 99.44%, 93.97% and 93.14%, respectively. The content of Fe3O4 and Cu in diluted slag were 1.53% and 0.61%, respectively. The copper-containing molten iron was obtained from the diluted copper slag by vortex reduction and then used to produce the wear-resistant cast iron, the element composition of which could meet the requirements of national standard of high chromium wear-resistant cast iron.