Material Flow Analysis of Aluminum Dross and Environmental Assessment for Its Recycling Process
Material Flow Analysis of Aluminum Dross and Environmental Assessment for Its Recycling Process
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DOI：
10.2320/matertrans.mra2007070
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发表时间：
2007-08
影响因子：
1.2
通讯作者：
K. Nakajima;H. Osuga;K. Yokoyama;T. Nagasaka
中科院分区：
文献类型：
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作者：
K. Nakajima;H. Osuga;K. Yokoyama;T. Nagasaka
在日本，在铝金属的熔化过程中，每年产生大约40万吨铝浮渣。铝浮渣和铝渣中金属铝含量高，主要用作铝生产的铝源或钢铁工业中的脱氧剂。另一方面，铝含量低于20%的低品位残渣难以回收，因此被填埋。本文介绍了（1）对国内铝浮渣进行物质流分析（MFA），以实现铝浮渣和残渣回收利用的明确目标;（2）对其回收利用新技术（例如残渣制氢工艺）进行环境评价。对2003年国内铝浮渣进行了物流分析，结果表明，铝浮渣回收量为234.4 × 103 t，残渣生成量为215.0 × 103 t。残渣主要用于炼钢过程，而50.0 × 103吨残渣在最终处置场填埋。通过物质流的环境评估的结果，有可能通过使用残渣（Al含量：10%）作为氢资源来减少CO2排放和废物排放，该残渣目前被填埋。
Approximately 400,000 tons per year of aluminum dross are generated during a melting process of aluminum metal in Japan. The Al dross and the residue, which have high concentration of metallic Al, are mostly used as an Al resource for Al production or as a deoxidizer in the steel industry. On the other hand, the lower grade residue with the Al content less than 20%, is difficult to be recycled and is therefore landfilled. This paper deals with (1) a material flow analysis (MFA) of the domestic aluminum dross in order to achieve clear targets for recycling of aluminum dross and residue, and (2) an environmental assessment of newly developed technologies for its recycling, such as the process of hydrogen production from residue. The result of material flow analysis on the domestic aluminum dross in 2003 shows that 234.4 x 10 3 t of aluminum is recovered and 215.0 x 10 3 t of residue is generated from the dross. The residue is mostly used in the steelmaking process, whereas 50.0 x 10 3 t of residue is landfilled in the final disposal site. As the result of the environmental assessment through the material flow, there is a possibility of reduction of CO 2 emission and waste emissions by using residue (Al content: 10%) as a hydrogen resource, which is presently landfilled.