【作者】 吕岩； 杨立彬； 那贤昭； 曾加庆；

【Author】 LV Yan;YANG Li-bing;NA Xian-zhao;ZENG Jia-qing;Department of Metallurgical Technology,Central Iron and Steel Research Institute;State Key Laboratory of Advanced Steel Processes and Products,Central Iron and Steel Research Institute;

【机构】 钢铁研究总院冶金工艺研究所； 钢铁研究总院先进钢铁流程及材料国家重点实验室；

【摘要】 由于冶炼工序特点,不锈钢渣作为含Cr特殊钢渣,其中的铬含量较高,存在Cr6+浸出风险。本研究利用硅热法,在含Cr特殊钢电炉冶炼末期对渣液层进行在线还原,可有效降低渣中重金属氧化物含量,渣中Cr2O3含量从6.10%降至0.79%,还原率最大可达到87.1%。解毒后电炉渣中作为Cr6+主要赋存相的钙铬石(CaCrO4)消失。经毒性浸出检测铬及六价铬浸出分别为Cr≤0.08mg/L,Cr6+≤0.01mg/L,均明显低于国家堆存限值和利用限值,符合环保及利用标准。更多还原

【Abstract】 As chromium content in special steel slag is very high,there is a certain leaching risk of Cr6+ from the slag.In this study,silicothermic reduction process was adopted for reducing and detoxifying of liquid layer of the slag during the end of stainless steel smelting.It is found that heavy metal oxide contents of the slag can be effectively reduced,of which Cr203 content is reduced from6.10%to 0.79%,and the maximum detoxification rate can be upto 87.1%.After detoxification,the phase of CaCr04,which is the main phase containing Cr6+,was disappeared.According to the leaching toxicity test,the leaching of total Cr was reduced to0.08mg/L,while the leaching of Cr6+ was reduced to below 0.01mg/L,and both of them were obviously far below the national standard’s value.Thus,safe discharging and resource utilization of the treated the special steel slag can be realized.更多还原