Abstract: Main analysis of stainless-steel dust with intermediate size 1. 78μm is (% ：) 41.0Fe, 3.3Ni, 24.80, 2. 6Cr, 4.1Ca, 3. 6Zn, of which the main mineralogy is Fe₃O₄, FeO • Cr₂O₃and CrO. The effect of gas-solid ratio (1.6- 4. 0 L/g), reduction time (50 ~300 s), CO fraction in H₂-CO mix gas (20% ~60%) and temperature (500 〜700 ℃) on reduction rate of stainless-steel oxides has been studied. Orthogonal test results show that the gas-solid ratio has most obvious effect in four factors, following in sequence being reduction mix gas ingredient, reduction time and reaction temperature. The reduction rate of stainless-steel dust is up to 50% in 5 min with gas-solid ration 4. 0 L/g, CO fraction 15% - 25% at 600 - 700℃.

摘要： 中位粒径1.78μm的不锈钢粉尘的成分为(%):41.0Fe、3.3Ni、24.8O、2.6Cr、4.1Ca、3.6Zn,其主要相组成为Fe₃O₄、FeO·Cr₂O₃、CrO。研究了气固比(1.6～4.0 L/g) 、还原时间(50～300 s) 、H₂-CO混合气体中CO的含量(20%～60%)和温度(500～700℃)对不锈钢粉尘还原的影响。正交试验结果表明,四个因素中气固比影响最为显著,其余依次为还原混合气体成分、还原时间和反应温度。气固比4.0 L/g,600～700℃, CO含量15%～25%,5 min内不锈钢粉尘的还原率可达50%。