Harmless Treatment of Stainless Steel EAF Slag and Its Engineering Performance for Using as Cement-Base Materials
LU Yan1,NA Xian-zhao1,QI Yuan-hong1,ZHEN Chang-liang2
1.State Key Laboratory of Advanced Steel Processes and Products, Central Iron and Steel Research Institute, Beijing 100081, China 2. Tangshan Iron and Steel Group Co., Ltd., Tangshan 063016, Hebei, China
Abstract:Stainless steel slag can be used as a kind of cementing matrix material, of which the component and phase structure is similar to cement clinker. Cr6+ exists in stainless steel EAF slag as CaCrO4 phase, and there is a certain leaching risk from the slag. The harmless treatment was investigated by the method of carbothermal dry detoxification. The results were indicated that, the chromium oxides of EAF slag were reduced effectively in the suitable conditions of reducing temperature, carbon amount and basicity. After reduction, the phase of CaCrO4 was disappeared and the leaching of total Cr and Cr6+ were far below the standard’s value. According to the text of cementitious property on the EAF slag treated by harmless disposal, it was found that both the activity index and the setting time of the EAF slag can reach the requirement of the specifications in GB/T 20491-2006. Therefore, the treated stainless steel EAF slag can be used as cementing matrix material to realize its safe discharging and resource utilization.
收稿日期: 2013-07-22
出版日期: 2014-04-28
引用本文:
吕岩,那贤昭,齐渊洪,甄常亮. 不锈钢EAF渣无害化处置及作为水泥基材料的工程性能[J]. 钢铁, 2014, 49(4): 90-95.
LU Yan,NA Xian-zhao,QI Yuan-hong,ZHEN Chang-liang. Harmless Treatment of Stainless Steel EAF Slag and Its Engineering Performance for Using as Cement-Base Materials. Iron and Steel, 2014, 49(4): 90-95.