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Separation and Recovery of Heavy Metals in Incinerator Fly Ash by Chloride Volatilization

Research Project

Project/Area Number 07555464
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section試験
Research Field Civil and environmental engineering
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

TAKEDA Nobuo  Kyoto University, Graduate School of Engineering, Professor, 工学研究科, 教授 (20026256)

Co-Investigator(Kenkyū-buntansha) TAKAOKA Masaki  Kyoto University, Graduate School of Engineering, Instructor, 工学研究科, 助手 (80252485)
岡島 重伸  京都大学, 工学部, 助手 (60233318)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1996: ¥700,000 (Direct Cost: ¥700,000)
KeywordsChloride Volatilization / Fly Ash / Heavy Metals / Detoxification treatment / Recycling / ごみ焼却飛灰 / 揮発法 / 熱分析 / 金属リサイクル / 化学平衡計算
Research Abstract

The concentrated heavy metals in the fly ash from municipal solid wasete incinerators were recovered and separated from that by chloride volatilization. The volatility of heavy metals was improved by forming chloride complex using NH_4Cl. Two types of fly ash in this experiment were sampled from electrostatic precipitator with or without lime injection for acid gas, The volatilization of heavy metals in fly ash was tested in N_2 or air atmosphere using both batch type and continuous type electric furnaces. The behavior of heavy metals in this experiment can be characterized as follows :
1) According to the results of metal volatilization for both types of fly ash, the remaining ratios of metals in treated fly ash were 5% for Cd, 10% for Pb, and 20% for Zn at the temperature of 900゚C using a batch type electric furmace.
2) The volatilization of Cu was facilitated more easily in air than in N_2
3) Heavy metal volatilization was not so much in a contimuous type furnance, but most of heavy metals remaining in ash became soluble in water.
4) The vaporized part was treated by Na_2S to precipitate heavy metals, and the precipitate contained high concentration of Pb at 28.3%
5) The validity of chloride volatilization in this experiments was confirmed by thermochemical data.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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