摘要
从厌氧燃烧、富氧燃烧、金属催化剂和飞灰触媒、温度等角度讨论铸造对二恶英循环和生成的影响,分析铸造过程二恶英生成机理及防止措施,提出控制砂中含盐量,可减少生成二恶英的必要条件氯的参与,通过钝化铸造飞灰的活性、控制型砂及旧砂中的残碳量、缩短铸造冷却过程在300～500℃温度段的逗留时间可大幅度减少二恶英重新合成的数量。统计表明铸造过程微粒释放数量与型砂所含苯 碳量呈正相关。
There is much emission of dioxins,furan and benzopyrene,etc.,while they are in hot conditions or not burning enough like that benzene ring or carbon.Its misfortune,there are large numbers of multi-benzene ring materials,mucilage glue,and etc.in foundry.It is commented that the influence to produce dioxins and their recycles with metal activator,dust accelerant,burning with full or lack oxide in foundry process.It is analyzed how dioxins produced in foundry and which way to prevent it.It is the most important that chloride is the key factor about dioxins.The sands from fresh water can decrease salt or chloride especially at high temperature.It is less compounds for dioxins newly,with short time staying at 300℃ to 500℃,to become unactivated state to mote by foundry,control remnants carbon in sand mold.It is pertinence to amounts of mote and remnants carbon by statistics.
出处
《铸造》
CAS
CSCD
北大核心
2004年第12期1035-1039,共5页
Foundry
基金
浙江省教育厅科研计划(20020202)
关键词
持久性有机污染物
铸造
二恶英
呋喃
氯化物
有机氯化物
环境污染
Persistent organic pollutants (POPs)
foundry
dioxins (PCDDs)
PCDFs
chloride
Organo-chloride pesticide
environment pollution
