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电炉渣相对于转炉渣具有更多的高温余热和更低的含铁组分回收率,但目前还没有合适的处理方法利用其余热回收更多的含铁物质。试验以河沙为改质剂,采用熔态改质方法处理电炉渣,研究在不同改质剂掺量下电炉渣碱度变化对其含铁组分回收率的影响规律,并进一步采用XRD、SEM-EDS等手段分析其中的矿相和结构变化。研究表明,采用熔态改质方法,在电炉熔渣排渣过程中加入改质剂降低其碱度,不仅能够充分利用其余热,还能够提高熔渣固化后的铁质组分回收率和胶凝活性,是电炉渣排渣处理的一条新途径。当改质电炉渣碱度下降到1.6时,随着SiO_2的增加,以三价铁形式存在的Ca_2Fe_2O_5和以二价铁形式存在的RO相减少并消失,活性矿物Ca_2SiO_4和强磁性的MgFe_2O_4、Fe_3O_4、FeCr_2O_4等形成并增加,这有利于铁及铬、锰重金属的回收以及尾渣胶凝活性的提高。在碱度为1.3时,强磁性矿物数量和磁选物质含铁组分回收率达到最大值69.71%,铁品位提高了43.74%。当改质电炉渣碱度小于1.3时,磁性矿相逐渐转变为弱磁性的含铝尖晶石,铁组分回收率下降。
Electric furnace slag has more high-temperature waste heat and lower iron-containing component recovery rate than converter slag, but no suitable treatment method is yet available to utilize the remaining heat to recover more iron-containing material. In the experiment, river sand was used as modifier, and molten slag was treated by melt modification method. The influence of basicity of EAF slag on the recovery of iron-bearing components was studied under different modifiers. SEM-EDS and other means of analysis of the changes in the mining phase and structure. The results show that by using the method of molten state modification, adding the modifier to reduce the alkalinity during slag discharge can not only make full use of the remaining heat, but also increase the recovery rate of iron components Condensation activity, is a new way of slag treatment. When the alkalinity of the modified EAF decreased to 1.6, with the increase of SiO 2, the existing Ca 2 Fe 2 O 5 in the form of ferric iron and the RO phase in the form of ferrous reduced and disappeared. The active minerals Ca 2 SiO 4 and ferromagnetism MgFe 2 O 4 and Fe 3 O 4 , FeCr_2O_4 and so form and increase, which is conducive to the recovery of iron and chromium, manganese heavy metals and tailings gel activity. When the basicity is 1.3, the amount of ferromagnetic minerals and iron-bearing components of magnetic separation material reaches the maximum of 69.71% and the grade of iron increases by 43.74%. When the alkalinity of the modified EAF is less than 1.3, the magnetic mineral phase gradually changes into the weakly magnetic aluminum-containing spinel, and the recovery rate of the iron component decreases.