生物质热解产物强化海砂矿选择性还原-磁选分离

Biomass pyrolysis product-enhanced selective reduction-magnetic separation of iron sand

以清洁、碳中性、高活性、可再生的生物质作为还原剂,通过密封性气塞限制热解产物的逃逸,对海砂矿内配生物质直接还原行为进行了研究,研究表明,限制生物质热解产生热解产物(CO、H_(2)、CO_(2)、H_(2)O、Cx Hy Oz)的逃逸,在反应罐内迅速形成了60 kPa的压力,有利于H_(2)、CO的参与还原。其中焦油具有更高的活性,且保障了后期H_(2)的来源,促进了海砂矿的低温快速还原。在还原温度1 120℃、还原80 min的条件下,可获得金属化率为97.81%、铁回收率为97.81%的铁粉,以及TiO_(2)回收率为69.98%和V_(2)O_(5)回收率59.93%的富钛渣。

Using clean,carbon neutral,highly reactive and renewable biomass as a reducing agent,limiting the escape of pyrolysis products by hermetic gas plugs,the direct reduction behavior of the biomass allotted within the iron sand was studied.The results show that a pressure of 60 kPa is rapidly developed in the reaction tank as a result of limiting the escape of pyrolysis products(CO、H_(2)、CO_(2)、H_(2O) 、Cx Hy Oz) from biomass pyrolysis,which facilitates the participation of H_(2),CO in the reduction.The tar has higher activity and guarantees the source of H_(2) in the later stage,which promotes the rapid reduction of iron sand at low temperature.Under the conditions of reduction temperature of 1 120 °C and reduction for 80 min,the iron powder with 97.81% metallization and 97.81% Fe recovery can be obtained,as well as the titanium-rich slag with a TiO_(2) recovery of 69.98% and a V_(2)O_(5) recovery of 59.93%.