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  4. Spinel Formation for Stabilization of Copper- and Aluminum- Containing Sludge by High Temperature Process
 
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Spinel Formation for Stabilization of Copper- and Aluminum- Containing Sludge by High Temperature Process

Date Issued
2009
Date
2009
Author(s)
Cheng, Yi-Ting
URI
http://ntur.lib.ntu.edu.tw//handle/246246/181605
Abstract
According to the declaring statistics of the Environmental Protection Administration in Taiwan, 185,172 tons heavy metal sludge were produced in 2007, and the copper-containing sludge were the main part of all. Without suitable treating, the heavy metal may pollute soil and groundwater, then lead to some damages to human and environment. Therefore, the aim of this study is to stabilize the simulated copper-containing sludge by transforming the sludge into spinel structure (CuAl2O4) through sintering process, and the optimum sintering conditions of the simulated sludge were applied to the field sludge to evaluate the feasibility of performing. he result indicated that the amount of salts in the sludge influenced the formation efficiency of CuAl2O4. Without desalinating, CuAl2O4 was not found by sintering. In contrast, the CuAl2O4 can be found after sintering at 800 - 1100oC for 3hr with proper desalinating procedure, and there was the best formation efficiency of CuAl2O4 at 1000oC. Similarly, increasing of desalinating led to the higher formation efficiency of CuAl2O4, but the different amount of salts led to different surface area of CuAl2O4 crystal. Therefore, the leaching concentration of copper was not only related to the formation of CuAl2O4 crystal, but also influenced by different surface area. Furthermore, there was better performance of leaching result and CuAl2O4 crystal formation with the mole ratio between copper and aluminum was 1:3.he sintering conditions including the temperature 1000℃, the isothermal time 3hr, and the conductivity range 451~800 μs/cm were used on field sludge. To compare the TCLP results between the samples before and after sintering, there was a great amount of decreasing leaching concentration that confirmed the spinel structure can effectively decrease the leaching concentration of copper by fixing the copper ion in the spinel structure.
Subjects
Copper
Sludge
Sinter
Spinel
CuAl2O4
Type
thesis
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ntu-98-R96541130-1.pdf

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