Sintering Regeneration of MSWI Cyclone Ash by Phosphoric Acid Stabilization Accompany with Clay Blending

• Main Authors: Yi-Ting Yeh, 葉依婷
• Other Authors: 高思懷
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/95214526519640304260

碩士 === 淡江大學 === 水資源及環境工程學系碩士班 === 93 === Incineration has become the main way for disposing urban garbage in Taiwan. Till 2006, there will be 27 large municipal solid waste incineration plants in Taiwan, and more than 30, 0000 tons incinerator fly ash will produced which need to be treated and disposed each year. Solidification is used to apply in the fly ashes handling, but the product is still unstable. This study investigated the fly ash stabilizing and sintering to reach the goal that increases the great value of reuse. The cyclone ash used in this study was collected from the municipal solid waste incineration in north Taiwan. In order to decrease solubility salts, the cyclone ash was treated by water-extraction. Mix clay and cyclone ash which stabilizing with phosphoric acid, and sintering. To find the optimum conditions though discuss the sample variation of source quality. Moreover, interpret the effect of add phosphoric acid to the sample by the evaporation experiment. The results showed that, stabilizing with phosphoric acid has well effect especially to lead. The sample which pre-washed cyclone ashes possibility of recovery has promoted before water-extraction and sample was conform to the Toxicity characteristic leaching procedure (TCLP) standard. In the evaporation experiment, and sintering at 1100 °C, adding clay and 0 mole/kg phosphoric acid stabilization increases to 1.5 mole/kg, the evaporation ratio of Pb drop 21.7 % to 1.2 %. Add phosphoric acid solution could reduce the heave metal evaporation during the sintering process. By sintering, sample could attend to compressive strength (100 kgf/cm2) and durability standard (weight loss under 12 %).