DETERMINATION OF METAL BEHAVIOR DURING THE INCINERATION OF A CONTAMINATED MONTMORILLONITE CLAY

被引:31
作者
EDDINGS, EG [1 ]
LIGHTY, JAS [1 ]
KOZINSKI, JA [1 ]
机构
[1] UNIV UTAH,DEPT CHEM & FUELS ENGN,SALT LAKE CITY,UT 84112
关键词
D O I
10.1021/es00060a007
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The goal of this study was to develop an understanding of metals behavior during thermal treatment. Clay samples, contaminated with metals to obtain a surrogate waste, were analyzed prior-to and following thermal treatment using nitric acid and/or hydrogen fluoride digestion, followed-by inductively coupled plasma emission spectrophotometry analysis. Techniques were used to examine particle surface and metal distribution within cross sections. Lead, cadmium, and chromium results are discussed. With hydrogen fluoride-digested samples, the results indicated that vaporization increased slightly with increasing temperature for cadmium and lead. Chromium did not show increased vaporization. At higher temperatures, the nitric acid digestions did not completely remove the metals. Scanning electron microscope pictures showed that, at higher temperatures, the particle structure became compact and glassy; the electron microprobe results indicated that lead and cadmium were located in regions with high silicon, suggesting reactions with the silicon. Chromium distribution remained uniform, suggesting that chromium was immobilized due to structural changes not reactions.
引用
收藏
页码:1791 / 1800
页数:10
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