Abstract: A new technology for recycling EAF dust and removal of sulfur from coking oven gas was investigated. The new technology does not need to set up special equipment to treat COG (coke oven gas), and it is only acquired by mixing the ZnO-base additive into the coke coal. In the stage of pyrolysis of the coal volatile, ZnO of the additive combines with H₂S, CS₂, COS and C₂H₂SH of coal gas, forming ZnS in coal char. In the stage of coking of the coal char, Zn is gasified with S, then the gas Zn react with H₂S, CS₂, COS and C₂H₂SH, forming ZnS in coal gas and depositing as dust. After the collected ZnS dust was regenerated, it can be recycling as the additive again. The sulfur in coal gas can be completely removed if the mole ratio of the added Zn to the volatilized S is more than 1, and the sulfur in coke is also slightly decreased comparing with the coke without the additive.  The EAF dust containing ZnO and Fe₂O₃can be the base material of the desulfurizing additive.

Key words:  sulfur removal; coal gas; coking; sulfur sorbent; EAF dust