不锈钢EAF渣无害化处置及作为水泥基材料的工程性能

 不锈钢电弧炉(EAF)渣具有胶凝活性，其主要化学成分及矿物组成与水泥材料相似，可作为水泥基材料加以利用。但不锈钢EAF渣中含有一定量的CaCrO4使其存在六价铬浸出风险。利用碳热还原干式解毒法对EAF渣进行无害化处理，对还原温度、配碳量及碱度进行控制，可有效将电炉渣中铬氧化物还原。还原后渣中CaCrO4相消失，总铬及六价铬浸出值明显低于标准限值。对解毒后EAF渣进行胶凝性能测试，其活性指数、凝结时间均符合GB/T 20491—2006规范要求，可应用于建材领域以达到安全排放及资源化利用目的。

Harmless Treatment of Stainless Steel EAF Slag and Its Engineering Performance for Using as Cement-Base Materials

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.