不同窑型的水泥生产中重金属的逸放与污染

Emission and Pollution of Heavy Metal during Cement Production in Different Kilns

文章利用原子吸收分光光度法等方法,研究了不同窑型水泥生产中重金属的逸放污染。无论何种水泥窑,Hg逸放率高达89%～96%。Pb、Cd在不同类型水泥窑中其逸放率有明显差别,立窑的逸放率较高,Pb和Cd为84%～90%;湿法回转窑次之;新型干法窑的逸放率最低,Pb和Cd为39%～57%。随水泥窑烟气逸放的Pb等重金属不仅会对周围环境造成污染,还会对人体健康造成危害。

Emission pollution of heavy metals during cement calcinations was investigated by means of atomic absorption spectroscopy （AAS）. The emission rate of Hg during cement calcinations was very high, in the range from 89% to 96%. But the emission rates of Pb and Cd were different in different kinds of kilns. The emission rates in shaft kiln were higher than in wet process rotary kiln and suspension preheater kiln. Those of Pb and Cd were in the range from 84 % to 90 %. The emission rates of Pb and Cd in suspension preheater kiln were in the range from 39 % to 57 %, they were the lowest in these different kinds of kilns. The emitted Pb, Cd and Hg pollute the soil nearby during the cement production by utilizing the waste materials with high contents of heavy metals, and it is harmful to people＇s health.