转炉炼钢用球团复合结合剂的开发  

DEVELOPMENT OF PELLET BINDING AGENT FOR CONVERTER STEELMAKING

作　　者：姚增远 Yao Zengyuan(Panzhihua Gangcheng Co.,Ltd.,Panzhihua 617000,Sichuan)

机构地区：[1]攀枝花钢城集团有限公司,四川攀枝花617000

出　　处：《河北冶金》2024年第7期61-65,共5页Hebei Metallurgy

摘　　要：为对钢厂除尘灰等二次资源进行绿色、循环再利用,根据转炉炼钢工艺要求,需将炼钢除尘灰等二次资源配加适量造渣材料制成转炉炼钢用冷固球团。采用传统工艺生产的结合剂制备球团,冷固球团强度约100 N、粉面率在20%以上,强度低,粉面率高,使用过程中利用效率较低。通过对结合剂机理进行系统分析,认为可以在复合剂中配加大量有机物的前提下,加入适量分散剂,提高其使用效果;并确定在工业淀粉50%、钠盐25%、硅微粉25%的配比下,固定混合料、结合剂添加比例不变,复合结合剂的成球效果最好。工业试验证明,结合剂添加比例1.5a%、搅拌时间210 s/缸、压球机压力4~8 MPa、辊坯线速度0.35~0.45 m/s时,制备的复合结合剂用于炼钢用球团,冷固球团的初始强度提高到200 N以上,最终强度达到800 N以上,粉面率降低至5%以下,可满足用户使用要求,提高使用效率。To promote the green and sustainable utilization of secondary resources such as dust ash,it is essential to produce cold solidified pellets for converter steelmaking by incorporating appropriate slag-making materials into the secondary resources.By utilizing the traditional process for producing pellet,the cold solidified pellet exhibits a strength of approximately 100 N and a powder surface rate exceeding 20%.However,it is characterized by low strength and high powder surface rate,resulting in low utilization efficiency during use.Through a systematic analysis of the binding agent mechanism,it is concluded that adding an appropriate amount of dispersant can enhance the application effect when a large amount of organic matter is present in the compound.It was determined that maintaining a fixed mixture and binding agent ratio at 50%industrial starch,25%sodium salt,and 25%silicon powder resulted in the best pellet forming effect for the composite binding agent.The industrial test proves that when the binding agent adding ratio is 1.5a%,the stirring time is 210 s/cylinder,the pressure of the ball press is 4~8 MPa,and the linear speed of the roll is 0.35~0.45 m/s,the prepared composite binding agent is used for steelmaking pellets,and the initial strength of the cold-set pellets is increased to more than 200 N,and the final strength is more than 800 N.The powder ratio can be reduced to less than 5%,which can meet the user's requirements and improve the use efficiency.

关 键 词：转炉 复合结合剂 冷固球团 搅拌时间 压球工艺 强度 

分 类 号：TF046.6[冶金工程—冶金物理化学]