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Cr-Ni不锈钢冶炼过程中每吨不锈钢产生30～40 kg的除尘灰,其中含有大量氧化铬、氧化镍、氧化铁等金属氧化物,研究回收除尘灰中金属元素的技术具有重要意义。在分析研究国内外除尘灰回收利用技术的基础上,通过热力学计算分析,提出将除尘灰压球后,直接装入电炉,利用碳硅还原除尘灰中的金属元素。对此技术在160 t电炉内进行前期试验研究,由试验结果可知,铁的回收率与试验熔清碳含量、硅铁加入量、渣碱度、温度等没有直接的关系,铬、镍的还原率受上述因素影响较大。
Cr-Ni stainless steel smelting process per ton of stainless steel produced 30 ~ 40 kg of dust, which contains a lot of chromium oxide, nickel oxide, iron oxide and other metal oxides, the study of dust removal ash metal elements of great significance. Based on the analysis of domestic and foreign research and development of dust removal and recycling technology, the calculation and analysis of thermodynamic calculation are put forward. After the dust is pressed into the furnace, it is directly loaded into the electric furnace and the metal elements in the dust are reduced by silicon carbide. According to the experimental results, the recovery rate of iron has no direct relation with the content of molten carbon, the amount of ferrosilicon added, slag alkalinity and temperature, and the reduction of chromium and nickel Rate by the above factors.