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以转炉除尘灰、高炉瓦斯灰和硫酸渣为含铁原料,制成CaO/SiO2值为2.0、C/O摩尔比为1.1～1.2的高碱度内配煤含铁团块,在1330～1380℃下进行自还原,研究这一过程的脱硫和脱磷规律.结果表明:(1)高碱度内配煤含铁团块自还原过程中,通过还原气化脱硫可去除20%～40%的硫,其余的硫绝大部分存在于渣中,并通过渣铁分离被去除,总脱硫率高于97%.(2)过量的CaO可以抑制脉石中的P2O5被碳还原,已被还原的磷一部分被新生态的金属铁吸收,另一部分从团块内部逸出而去除.脉石中未被还原的P2O5最终可通过渣铁分离被去除,总脱磷率达到50%～60%.(3)高碱度内配煤含铁团块高温自还原法可制备出低硫、低磷的“纯净”金属铁粒.
In the converter dust ash, blast furnace gas ash and sulfuric acid slag as the iron-containing raw materials, made with high CaO / SiO2 value of 2.0, C / O molar ratio of 1.1 ~ 1.2 within the high alkalinity with coal briquettes in the 1330 ~ 1380 The results show that: (1) In the process of self-reduction of iron-bearing briquette with high alkalinity, 20% -40% can be removed by reduction gasification desulfurization, Sulfur, most of the rest of the sulfur exists in the slag, and was removed by the separation of slag and iron, the total desulfurization rate higher than 97%. (2) excessive CaO can inhibit gangue P2O5 carbon reduction has been reduced Of phosphorus is partly absorbed by neo-ecological metal iron, while the other part is removed from the inside of the briquette.The unreduced P2O5 in the gangue can finally be removed by slag-iron separation, and the total dephosphorization rate reaches 50% -60%. (3) High-alkalinity coal-bearing iron lumps self-reduction method can be prepared low-sulfur, low-phosphorus “pure ” metal iron particles.