Leaching of the residue from the dry off-gas de-dusting and desulfurization process of an iron ore sinter plant  

作　　者：Christof Lanzerstorfer Qi Xu Robert Neuhold 

机构地区：[1]School of Engineering/Environmental Sciences, University of Applied Sciences Upper Austria [2]Siemens VAI Metals Technologies GmbH

出　　处：《International Journal of Minerals,Metallurgy and Materials》2015年第2期116-121,共6页矿物冶金与材料学报（英文版）

基　　金：financially supported by the research program of K1-MET;financially supported within the Austrian competence centre program COMET by the Federal Ministry of Economy,Family and Youth;by the Federal Ministry for Transport,Innovation and Technology;by the federal states of Upper Austria,Styria,and Tyrol;by the Styrian Business Promotion Agency;by the Tiroler Zukunftsstiftung

摘　　要：The residue from a second-stage dry sinter plant off-gas cleaning process contains both the fine dust from the sinter plant and the sorbent used. Recycling of the material that is usually handled by landfills to the sinter plant feed is not possible because of its chloride con- tent. Leaching of the chlorides allow the recycling of remaining solids. The saline leachate produced contains some heavy metals and must be treated before it is discharged into the sea. In laboratory experiments, leaching tests with the subsequent treatment of the leachate were con- ducted. After the process was optimized, all heavy-metal concentrations were below the permissible values. The optimum treatment condi- tions for heavy-metal precipitation were observed to be the filtration of the suspended solids followed by the dosing of liquid with lime milk （pH 10） and the subsequent precipitation using sodium sulfide.The residue from a second-stage dry sinter plant off-gas cleaning process contains both the fine dust from the sinter plant and the sorbent used. Recycling of the material that is usually handled by landfills to the sinter plant feed is not possible because of its chloride con- tent. Leaching of the chlorides allow the recycling of remaining solids. The saline leachate produced contains some heavy metals and must be treated before it is discharged into the sea. In laboratory experiments, leaching tests with the subsequent treatment of the leachate were con- ducted. After the process was optimized, all heavy-metal concentrations were below the permissible values. The optimum treatment condi- tions for heavy-metal precipitation were observed to be the filtration of the suspended solids followed by the dosing of liquid with lime milk （pH 10） and the subsequent precipitation using sodium sulfide.

关 键 词：heavy metals off-gas cleaning recycling RESIDUES LEACHING sinter plants 

分 类 号：X757[环境科学与工程—环境工程]