Drizo Aleksandra, Cummings John, Weber David, Twohig Eamon, Druschel Greg, Bourke Bill
Department of Plant and Soil Science, Hills Agricultural Building, 105 Carrigan Drive, University of Vermont, Burlington, Vermont 05405, USA.
Environ Sci Technol. 2008 Aug 15;42(16):6191-7. doi: 10.1021/es800232r.
The purpose of this research was to investigate phosphorus (P) retention capacity and rejuvenation potential of electric arc furnace (EAF) steel slag from Quebec and New Zealand (NZ) iron melter slag (IMS). Columns filled with slag materials were fed with dairy effluent and subjected to two feeding and one resting cycle(s). P retention capacities and rejuvenation potentials were determined after each feeding cycle. Elemental composition and mineralogical analysis were performed on IMS samples. Finally, chemical fractionation analysis was conducted on both NZ IMS and Quebec EAF steel slags. The results revealed that initiating a resting period in EAF steel slag filters prior to reaching their P saturation point increased the overall filter P retention capacity by 49.5 and 42.4% compared to 28% in a filter which had its resting period initiated after reaching P saturation. The rejuvenation property could play a significant role in full-scale applications by prolonging life expectancy and increasing cost efficiency. P retention and rejuvenation by NZ slag materials was negligible relative to EAF steel slag material from Quebec. Chemical fractionation analysis revealed differences between materials, indicating that the highest quantities of P were bound to Ca and Fe in EAF steel slag and to Ca and Al fractions in iron melter slag. This study also demonstrates that slag's performance is dependent on the source of the material and the steel making practices. Therefore, testing of the P adsorptive capability and, if relevant, the rejuvenation potential of individual steel mill slags, should be a prerequisite prior to their use in field applications.
本研究的目的是调查魁北克电弧炉（EAF）钢渣以及新西兰（NZ）铁熔炉渣（IMS）的磷（P）保留能力和再生潜力。向填充有炉渣材料的柱体中加入奶牛场废水，并使其经历两个进料和一个静置循环。在每个进料循环后测定磷保留能力和再生潜力。对IMS样品进行了元素组成和矿物学分析。最后，对NZ IMS和魁北克EAF钢渣进行了化学分级分析。结果表明，在电弧炉钢渣过滤器达到磷饱和点之前开始静置期，与在达到磷饱和后开始静置期的过滤器相比，整体过滤器的磷保留能力提高了49.5%和42.4%，而后者仅提高了28%。再生特性通过延长预期寿命和提高成本效率，可能在大规模应用中发挥重要作用。相对于魁北克的电弧炉钢渣材料，NZ炉渣材料的磷保留和再生能力可忽略不计。化学分级分析揭示了材料之间的差异，表明电弧炉钢渣中与钙和铁结合的磷含量最高，而铁熔炉渣中与钙和铝组分结合的磷含量最高。本研究还表明，炉渣的性能取决于材料来源和炼钢工艺。因此，在将各个钢厂的炉渣用于现场应用之前，测试其磷吸附能力以及（如相关）再生潜力应是一项先决条件。
