三产品旋流器瓦斯泥集铁降锌试验研究

Experimental study on iron collection and zinc decrease from blast furnace sludge with three-product hydrocyclones

针对瓦斯泥中细泥和细粒级锌含量高、分选效果差的问题,提出了在流化分选前采用三产品旋流器对瓦斯泥集铁降锌的处理工艺,选用φ100 mm平底旋流器与φ75 mm柱锥旋流器串联,并采用控制变量的方法,改变二段旋流器底流口直径和锥角角度,得到瓦斯泥在底流和溢流中的不同粒度分布,研究各变量对分级性能的影响规律。结果表明:采用21 mm底流口和90°锥角时,底流中-20μm颗粒含量由27.83%降低到0.97%,有效脱锌的同时实现粗粒级铁的高效富集,可直接作为铁精矿;二段溢流产品达到流化分选的入料要求;一段溢流中铁的品位低,流化分选性能差,直接排入尾矿。三产品旋流器瓦斯泥集铁降锌工艺有助于减少流化分选能量损耗,提高分选指标,可为工业生产实践提供一定的理论依据。

In view of high content of fine particles and zinc in blast furnace sludge and poor separation efficiency,a treatment process was proposed for iron collection and zinc reduction from blast furnace sludge before fluidization separation using threeproduct hydrocyclones.A φ100 mm flat-bottom hydrocyclone and a φ75 mm cylindrical-conical hydrocyclone were selected and connected in series.The method for controlling the variables was adopted to change the apex diameter and cone angle of the second-stage hydrocyclone,and the distribution of different particle sizes in the overflow and underflow of the blast furnace sludge was obtained to study the influencing law of the variables on the separation performance.The results show that,with the 21 mm apex diameter and 90°cone angle,the content of -20μm particles in the underflow is reduced from 27.83% to 0.97%.While zinc content is effectively removed,high-efficiency enrichment of coarse-grained iron is achieved,which can be directly used as iron concentrate.The second-stage overflow product meets the feeding requirement for fluidization separation.The iron grade in the firststage overflow is low,since its fluidization separation is poor,it can be discharged directly into the tailing.The iron collection and zinc reduction process from blast furnace sludge in three-product hydrocyclone is helpful to reduce the energy loss of fluidization separation and improve the separation index,which can provide certain theoretical basis for the industrial application.