强化制粒对高铁低硅混合料烧结的影响  

THE EFFECT OF ENHANCES GRANULATING ON HIGH Fe AND LOW SiO_2 SINTER

作　　者：朱德庆[1] 张克诚 何奥平[1] 范晓慧[1] 曾新中 肖力华 

机构地区：[1]中南大学钢铁系烧结球团研究所,湖南长沙410083 [2]涟源钢铁集团公司烧结厂

出　　处：《烧结球团》2003年第1期9-13,共5页Sintering and Pelletizing

摘　　要：在试验室利用 30 0mm烧结杯试验装置 ,考查了高生石灰配比 ,生石灰消化时间、混合料水分、制粒时间及焦粉分加等对高铁低硅混合料烧结产质量的影响 ,并采用光学显微镜和扫描电镜 (SEM )对烧结矿的矿物组成和微观结构进行了研究。研究结果表明 ,通过采取强化制粒措施 ,高铁低硅烧结矿 (烧结矿TFe 5 8 8%SiO2 4 38% )产质量得到了明显的提高。在生石灰配比 5 %、生石灰消化 8～ 10min、混合料制粒 5min的条件下 ,烧结矿转鼓强度由 6 3 43%提高到 6 5 2 3 % ,利用系数由 1 6 71t/ (m2 ·h)提高到 1 894t/ (m2 ·h)。通过高配比生石灰及采取相应强化措施实现强化制粒 ,提高烧结料层氧位 ,促进铁酸钙的形成 ,烧结矿中铁酸钙含量提高了 2 73 % ,且铁酸钙呈针状。从而有利于提高烧结矿强度 ,改善烧结矿还原性。The effect of many parameters,including higher burnt lime addition,digestion of burnt lime,mix moisture and granulation time,on the sintering of high iron and low silica mix was performed,and the sinter minerology was determined by using microscopy and SEM.It is shown that properties and productivity of sinter with 58.5% iron and 4.38% SiO 2 content were improved by using burnt lime and corresponding measures to enhance granulation process.Under the conditions of 5% burnt lime addition,digestion of burnt lime for 10 mins and granulation for 5 mins,the tumble index was increased from 63.43% to 65.23%,productivity from 1.671 t/(m2·h) to 1.894 t/(m2·h).The amount of calcuim ferrite was increased by 2.73% and the main occurrence of CF is acicular,which is achieved by improving the oxygen poential in the bed with a higher permeability,resulting in higher strength and better reducibility of finished sinter.

关 键 词：强化制粒 高铁低硅混合料 烧结 生石灰 透气性 铁酸钙 

分 类 号：TF046.4[冶金工程—冶金物理化学]