Desulfurization and dephosphorization during self-reduction of high-basicity coal-bearing iron oxide briquettes
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摘要: 以轉爐除塵灰、高爐瓦斯灰和硫酸渣為含鐵原料,制成CaO/SiO2值為2.0、C/O摩爾比為1.1～1.2的高堿度內配煤含鐵團塊,在1330～1380℃下進行自還原,研究這一過程的脫硫和脫磷規律.結果表明:(1)高堿度內配煤含鐵團塊自還原過程中,通過還原氣化脫硫可去除20%～40%的硫,其余的硫絕大部分存在于渣中,并通過渣鐵分離被去除,總脫硫率高于97%.(2)過量的CaO可以抑制脈石中的P2O5被碳還原,已被還原的磷一部分被新生態的金屬鐵吸收,另一部分從團塊內部逸出而去除.脈石中未被還原的P2O5最終可通過渣鐵分離被去除,總脫磷率達到50%～60%.(3)高堿度內配煤含鐵團塊高溫自還原法可制備出低硫、低磷的"純凈"金屬鐵粒.Abstract: High-basicity coal-bearing iron oxide briquettes with a CaO/SiO2 of 2.0 and a C/O molar ratio of 1.1 to 1.2, which were produced by BOF steelmaking sludge, BF dedusting ash and pyrite cinder, were self-reduced at temperatures from 1 330 ℃ to 1 380 ℃ to study the phenomena of desulfurization and dephosphorization.During the self-reduction, the desulfurization ratio by evaporating as COS is 20% to 40%.Residual sulphur is attached in slag and it can be separated from iron nuggets.The total desulfurization ratio is more than 97%.Excessive CaO in high-basicity coal-bearing iron oxide briquettes can restrain the reaction of phosphorous pentoxide reduced by carbon.The reduced phosphorous is partially absorbed by nascent metallic iron, and the other escapes from the briquettes.Phosphorous pentoxide attached in gangue which is not yet reduced can be separated from iron nuggets.The total dephosphorization ratio can reach up to 50% to 60%.It is indicated that clean iron nuggets with low sulphur and low phosphorous can be produced by self-reduction of high-basicity coal-bearing iron oxide briquettes
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Key words:
- iron /
- direct reduction /
- desulfurization /
- dephosphorization
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