中低温碳氢还原-磁选不锈钢渣的实验研究

Experimental Study on Reduction of Stainless Steel-making Slag with CO and H_2 at Intermediate-low Temperatures and Its Magnetic Separation

以铁浴终还原炉产生并重整的含H2和CO混合气体为还原气,采用自主设计的间歇振动式斜直管移动床反应器对不锈钢渣进行预还原,探索了不锈钢渣在中低温条件下进行固态还原磁选以初步分离不锈钢渣中有用金属的可能性,对处理后的不锈钢渣进行了毒性浸出.结果表明,在磁场强度200mT、振动/间歇比1:2、炉温700～750℃、CO/H2体积比1:4的条件下,可同时获得较高的磁性物产率、TFe品位和Fe回收率,分别为10.53%,49.33%和98.2%.处理后所得磁性物质中CaO,MgO,Al2O3,SiO2等杂质氧化物的总含量从80%降到40%以下,尾渣达到国家排放标准.

Pre-reduction of stainless steel-making slag was studied in a newly designed moving bed reactor with inclined tube and intermittent vibrators. The mixed gas of H2 and CO was used to simulate the exhaust gas produced and reformed in iron bath end reduction furnace to explore the possibility of preliminary separation of useful metals from stainless steel slag at intermediate and low temperatures by solid state reduction-magnetic separation. And the toxicity leaching experiment of stainless steel slag after treatment was carried out. The results show that higher productivity of magnetic product （10.53%）, total iron grade （49.33%） and recovery rate of Fe （98.2%） can be obtained under the conditions of magnetic field strength at 200 mT, vibration intermittent 1：2, temperature 700-750℃ and CO/H2 volume ratio 1：4. The total amount of oxide impurities in the magnetic material after the treatment, such as CaO, MgO, Al2O3, SIO2, decreases significantly, from 80% to below 40%. And the tailings can meet the national emission standards.