铁釜 汉代 （公元前202年—220年） 河南 Iron Boiler Han Dynasty(202 B.C.–220 A.D.) Henan
墓中用铜釜或铁釜或铜鼓套在死者头部，个别还同时在死者足部套一件铁釜。
In such graves, copper axes, iron axes or copper drums were put round the heads of the dead. Some of the dead were even put an iron axes round feet simultaneously.
利用硫酸酸洗废液作为原料，经浓缩后在反应釜内生产聚合硫酸铁。
Waste sulphuric acid liquor is used as raw material to produce polymer iron sulfate in a reaction vessel after concentration.
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