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Making ash slag harmless and metal recovery from secondary volatilized fly ash

灰渣无害化及二次挥发粉煤灰金属回收

基本信息

批准号：
14550727
负责人：
KAWAHARA Masayasu
金额：
$ 1.86万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550727/
关键词：
Fly ash Melting treatment Slag Secondary fly ash Lead Heavy metal Hydrochloric acid leaching Sulfuric acid leaching 砒素

项目摘要

Elution property of heavy metal from fly ash molten slag and synthesized slag containing heavy metals were investigated. Some of results are follows.Melting treatment and vitrification of fly ash was effective for prevention of dissolution of heavy metals but with minor exception. Adding silica to fly ash and holding high temperature was valid with prevention of dissolution of heavy metals. Elution pH changes after elution test that affect elution property. Alkali metal rich fly ash rises elution pH. Heat treatment of slag had an effect for improve the elution of heavy metals.The leaching of secondary volatilized fly ash with sulfuric acid and hydrochloric acid has been conducted, and leaching properties of ash were investigated. Some of results are follows.Zn, Pb, Cu and Fe were leached from secondary volatilized fly ash by hydrochloric acid solution, but Pb was not leached from the ash by sulfuric acid solution. For leaching the ash containing high amount of alkali content, a large quantity of acid was needed.Cu was recovered from the leaching solution after sulfuric acid leaching by cementation. Fe and Zn were recovered from the solution after cementation by pH control. Pb was leached from the residue after sulfuric acid leaching by sodium acetate solution.

研究了粉煤灰熔渣和含重金属合成渣中重金属的溶出特性。一些结果如下。飞灰的熔化处理和玻璃化对于防止重金属的溶解是有效的，但也有少数例外。在粉煤灰中添加二氧化硅并保持高温可有效防止重金属溶解。洗脱测试后洗脱pH值发生变化，影响洗脱性能。富含碱金属的粉煤灰会升高洗脱 pH 值。炉渣的热处理对改善重金属的溶出有一定作用。对二次挥发粉煤灰进行了硫酸和盐酸浸出，并考察了灰的浸出性能。部分研究结果如下：二次挥发飞灰中的盐酸溶液浸出Zn、Pb、Cu、Fe，而硫酸溶液未浸出飞灰中的Pb。浸出含碱量较高的灰分，需要大量的酸。硫酸浸出后的浸出液通过胶结法回收铜。胶结后通过pH控制从溶液中回收Fe和Zn。硫酸浸出后的残渣用乙酸钠溶液浸出Pb。