铁尾矿掺加量及烧成制度对烧结砖性能的影响  

Study on Influence of Iron Tailing Content and Firing System on Performance of Fired Bricks

作　　者：刘连花[1] 左然芳[1] 索也兵 杜高翔[1] 

机构地区：[1]中国地质大学(北京)材料科学与工程学院,北京100083 [2]中国建筑材料工业规划研究院,北京100025

出　　处：《非金属矿》2013年第5期4-6,共3页Non-Metallic Mines

基　　金：国家863计划项目(2012AA062403)

摘　　要：在对铁尾矿、黏土、煤矸石等原料性质进行分析的基础上,按照一定配比制备烧结砖,考察了铁尾矿掺加量及烧成制度对烧结砖性能的影响。结果表明,铁尾矿掺加量、烧成温度、保温时间均对烧结砖性能有较大影响。随着铁尾矿掺加量从20%增加到55%,烧结砖体积密度变化不大,吸水率和抗压强度逐渐减小;随着烧成温度的升高,烧结砖试样体积密度、吸水率逐渐减小,抗压强度逐渐增大;随着保温时间的延长,烧结砖试样抗压强度逐渐增大,体积密度和吸水率变化不大。烧结砖试样有轻微泛霜现象和一定的石灰爆裂现象,当烧成温度低于900℃时,石灰爆裂现象更严重。制备烧结砖的最优条件为:铁尾矿掺加量45%、烧成温度1000℃、保温时间120 min;烧结砖强度达到GB5101-2003强度等级MU20要求。Fired bricks were prepared with iron tailings, clay and coal gangue based on analysis of the basic characterizations. The test investigated the influence of iron tailings content and firing system on the performance of fired bricks. The results showed that the content of iron tailings and temperature had important influence on the performance of fired bricks. The water absorption and compressive strength were reduced when the content of iron tailings increased from 20% to 55%, while the volume density had a little change. The volume density and water absorption were decreased; the compressive strength was increased with the rise of firing temperature. When the holding time was prolonged, the compressive strength was gradually increased and the volume density and water absorption had a little change. When the firing temperature was below 900 ℃, the fired bricks produced many fractures and it is known as ＂lime blowing＂. The optimal condition of fired brick preparation was： the content of iron tailings 45%, firing temperature 1000 ℃, the holding time 120 min. The compressive strength of fired brick reached the requirements of GB5101-2003 strength grade MU20.

关 键 词：铁尾矿 烧结砖 掺加量 烧成制度 

分 类 号：TU522.19[建筑科学—建筑技术科学] TD926.42[矿业工程—选矿]