燃煤锅炉粉煤灰中典型痕量金属元素淋滤特性研究  

LEACHING CHARACTERISTICS OF HEAVY METALS IN FLY ASH FROM DIFFERENT ESPs OF COAL-FIRED POWER PLANT

作　　者：龚勋[1] 郝炜[1] 张丹[1] 李琳[1] 乔瑜[1] 姚洪[1] 徐明厚[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《工程热物理学报》2009年第1期156-160,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.90610017;No.50721005);教育部博士点基金(No.20050487014)

摘　　要：本文通过批淋滤实验研究了某电厂2号炉三个静电除尘器下粉煤灰中Cd、Cr、Pb、V的淋滤特性。淋滤液选择pH=4的HCl和pH=10的NaOH溶液,液固比为4:1;批淋滤选取从15分钟到7天的14个时间进行。实验结果显示,在实验条件下,Cr在酸性条件下淋出滤较高,而Ph在碱性条件下淋出滤较高;其中Cr随着淋滤时间的增加,淋出滤有显著增加,且三种粉煤灰中淋出滤大小为L_(Cr3)>L_(Cr2)>L_(Cr1)。Batch leaching tests have been performed on fly ashes collected from three electrostatic precipitators（ESP） of 2# furnace in a coal-fired power plant in order to study the leaching characteristics of Cd, Cr , Pb, V in fly ashes. Leaching solutions are chosen with HCl solution of initial pH=4 and NaOH solution of pH=10, liquid/solid=4：1, forteen leaching times are chosen, different from 15 minutes to 7 days. The results show that under the experimental conditions, Cr has a relatively high leachability in acid leaching solution, while Pb has a high leachability in alkaline solution. Besides, with the accumulating of leaching time, the leachability of Cr has obviously increased, and the leachability in three coal ashes shows a tendency as follows： LCr3 〉 LCr2 ：〉 LCr1.

关 键 词：粉煤灰 淋滤 痕量元素 

分 类 号：TK16[动力工程及工程热物理—热能工程]