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|Other Titles: ||A study on the regeneration of municipal solid waste incinerator fly ash as the feedstock in the brick manufacturing|
|Authors: ||黃承鈞;Huang, Cheng-chun|
|Keywords: ||都市垃圾焚化飛灰;紅磚;燒結;磷酸穩定重金屬;MSWI fly ash;Brick;H3PO4 stablize heavy metal release;sinter;water-extraction ash|
|Issue Date: ||2010-09-23 17:55:57 (UTC+8)|
Municipal solid waste incinerator (MSWI) ashes have been regarded as a resource to be recycled; however, MSWI fly ash (FA) usually has the high probability of heavy metals and salts releasing, therefore, stabilizing the heavy metal is the necessary pretreatment on the recovery process of FA. One of the feasible processes to recovery the FA is applying it as a part of the feedstock during the brick manufacturing.
In this study, the pretreatment process includes water-washing, ball-milling, phosphoric acid stabilizing, and component adjusting following the sintering operation. Most of soluble materials of FA were eliminated during the water-washing, which will increase the stability in the following processes. Wet-ball-milling with phosphoric acid solution will increase the effectiveness of heavy metals stabilizing, while adjusting the component with cullet during the milling operation will enhance the property of sintering product.
The results showed that, washed FA (WFA) milling with phosphoric acid, sintered with clay by 4% substitution, the compression strength of sintered specimen could met thestandards of CNS ordinary brick 1, and percentage of heavy metal volatilization during brick sintering were less than that the phosphoric acid dosage without milling with the WFA. In the composition adjusting with cullet experiment, with WFA 60% cullet 40%, the sintered specimen presented the best compressing strength. When substituted the clay with 20% of pretreated and adjusted matrix during the brick sintering, the compression strength of sintered specimen reached 408 kg/cm2 which was higher than the standards of CNS ordinary brick 1. Through the conversion to the actual weight, the WFA occupied 12% of the total feedstock, it reveals that wet-ball-milling of cullet with WFA and phosphoric acid greatly increasing the amount of WFA substitution during the sintering process.
|Appears in Collections:||[水資源及環境工程學系暨研究所] 學位論文|
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