生活垃圾焚烧炉渣中有价金属的形态与可回收特征

基于生活垃圾焚烧炉渣金属形态实验室分析与中试回收生产线的磁性分选和涡电流分选试验，对生活垃圾焚烧炉渣中有价金属铁（Fe）、铝（Al）和铜（Cu）的可回收特征进行了研究.结果表明:生活垃圾焚烧炉渣中有价金属磁选和涡电流分选回收产率分别为12.3%和1.14%，Fe的磁选回收率为14.8%，Al、Cu的涡电流回收率分别为73.1%和52.7%.生活垃圾焚烧炉渣中Cu和Fe的回收效率分别受其含量分布和赋存形态的影响，其中Cu的回收产率和回收率受Cu的含量与分布的影响，而Fe的回收率与产率则受炉渣中Fe的含量与形态的限制.在实践中，可通过调整涡电流运行参数、增大磁场强度、降低炉渣含水率等方式提高炉渣中金属的回收效率. 

Speciation and Recoverability of Valuable Metals in Municipal Solid Waste Incineration Bottom Ash

Abstract:The recoverability of ferrous(Fe)and non-ferrous(Al and Cu)metals from municipal solid waste incineration bottom ash(MSWIBA)was investigated based on speciation analysis of metals in MSWIBA,and metal recovery was tested using a pilot production line equipped with magnetic and eddy current separators.The results showed that the productivities of ferrous and non-ferrous metal products were 12.3% and 1.14% respectively.Moreover,the recovery ratio of Fe was 14.8% on a basis of the total MSWIBA,and the recovery ratios of Al and Cu were 73.1% and 52.7% respectively on a basis of >5 mm MSWIBA.Fe recovery from MSWIBA was limited by its speciation,while Cu recovery was limited by its distribution characteristics.It was suggested that the metal recovery could be improved by several methods,such as the adjustment of the mechanical parameters,enlargement of magnetic density,decrease of moisture content in MSWIBA,and so on.