Abstract: The stainless steel pickling sludge was calcined with graphite powder as the reducing agent, and then separated by magnetic treatment for recovery of metals. The results showed that under the optimal conditions of reduction temperature 1350℃, holding time 300 min, and atomic ratio of C to O 1.2 (mass ratio of carbon to the sludge at 11.8:100), the recovery rates of Fe, Cr and Ni were 92.7%, 86.7% and 93.6%, respectively. After reduction-magnetic separation, the content of Cr and Ni was decreased down to 0.07% and 0.04%, respectively, which meets the national discharge standard.

Key words: stainless steel pickling sludge, reduction, magnetic separation, ratio of C to O, metal, recovery

摘要： 以石墨粉为还原剂，与不锈钢酸洗污泥混合煅烧，再进行磁选，回收酸洗污泥中的金属. 结果表明，在还原温度1350℃、保温时间300 min、配碳比为1.2(碳与污泥质量比为11.8:100)时，酸洗污泥中Fe, Cr和Ni的回收率分别为92.7%, 86.7%和93.6%；酸洗污泥经还原-磁选后Cr和Ni含量分别降到0.07%和0.04%，达到了国家排放标准.

关键词: 不锈钢酸洗污泥, 还原, 磁选, 配碳比, 金属, 回收