不锈钢渣资源利用特性与重金属污染风险  

Beneficial Reuse of Stainless Steel Slag and Its Heavy Metals Pollution Risk

作　　者：张翔宇[1] 章骅[1] 何品晶[1] 邵立明[1] 王如意[2] 陈荣欢[2] 

机构地区：[1]同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室,上海200092 [2]宝山钢铁股份有限公司研究院环境与资源研究所,上海201900

出　　处：《环境科学研究》2008年第4期33-37,共5页Research of Environmental Sciences

基　　金：国家高技术研究发展计划(863)重点项目(2007AA061304);宝山钢铁股份有限公司委托项目

摘　　要：研究了2种不锈钢渣——电炉(EAF)钢渣和转炉(AOD)钢渣可资源化利用和重金属污染特性.结果表明:2种钢渣的粒径主要分布于小于5 mm的范围内;EAF钢渣的主要元素(w>1%)为Ca,Si,Mg,Al,Fe,O和Cr,主要矿物质为Ca2SiO4和Ca3Mg(SiO4)2;而AOD钢渣主要由Ca,Si,Mg,C和O等元素组成,主要矿物质为Ca2SiO4,资源化利用潜力大.不锈钢渣浸出毒性测试结果表明:除Cr外,所有重金属浸出质量浓度均低于或接近于检测限,Cr浸出质量浓度小于0.2 mg/L,远低于危险废物鉴别标准(GB5085.3-1996)相应限值,且重金属主要以稳定的化学形态存在;根据有效浸出测试结果,不锈钢渣中的Cr在最不利条件下存在溶出风险,但以毒性较低的Cr(Ⅲ)为主,与X射线衍射测试结果一致.因此,不锈钢渣中的重金属浸出污染风险低.The feasibility of beneficial reuse of two kinds of stainless steel slag, electric arc furnace （EAF） slag and argon oxygen decarburization furnace （AOD） slag, and their pollution properties of heavy metals were studied. The resuhs indicate that the majority of the slags were sized 〈 5 mm. The main elements （mass content 〉 1%） in the EAF slag were Ca, Si, Mg, Al, Fe, O, and Cr, existing as Ca2 SiO4 and Ca3 Mg（ SiO4 ）2, while the AOD slag was mainly composed of Ca, Si, Mg, C, and O, and the main minerals were Ca2 SiO4. The slags were suitable for beneficial reuse. The leaching mass concentrations of all heavy metals except Cr by the leaching test were lower than or close to the detection limit. The leaching mass concentration of Cr was 〈 0.2 mg/L, far lower than the limit values of Identification Standards for Hazardous Wastes （GB5085.3-1996）. Most of the heavy metals existed as stable speciation. The availability leaching test results show that Cr could be leached out at the ＂worst scenario＂, but mainly as the less hazardous Cr（ Ⅲ ）, which was confirmed by the XRD analysis results. Therefore, the pollution risks of the heavy metals in the stainless steel slags were low.

关 键 词：不锈钢渣 资源化利用 矿物组成 浸出毒性 重金属 污染特性 

分 类 号：X705[环境科学与工程—环境工程]