温度对铁矾渣内配煤球团抗压强度及其物相变化的影响  

Effect of temperature on the compressive strength and phase change of pellets with coaland jarosite slag

作　　者：杨慧芬[1] 李真 王亚运[1] 侯小强 桂海平 刘倩 Yang Huifen;Li Zhen;Wang Yayun;Hou Xiaoqiang;Gui Haiping;Liu qian(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083;Hanzhong Zinc Industry Co.,Lid.,Hanzhong 723000,Shanxi)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]汉中锌业有限责任公司,陕西汉中723000

出　　处：《烧结球团》2020年第3期61-66,共6页Sintering and Pelletizing

摘　　要：在铁矾渣、还原煤、水质量比为100∶25∶35条件下,进行了温度对铁矾渣内配煤球团抗压强度及其物相变化的影响研究。结果表明:温度对铁矾渣内配煤球团抗压强度、物相变化具有重要影响。当温度<700℃时,球团的抗压强度较低,球团中挥发性物相分解生成了Fe2O3、PbSO4及6MgO·Al2O3等中间物相;而当温度>700℃时,球团的抗压强度迅速增大,球团中新生成的中间物相Fe2O3、PbSO4及原有物相ZnFe2O4、CaSO4发生还原反应,生成挥发性的Pb、Zn、S和FeS、MFe、CaS等最终物相;球团物相变化的过程伴随着球团抗压强度和外观颜色的变化、球团体积的收缩;在温度为1200℃(恒温90 min)时,球团中Pb、Zn、S的挥发率分别为95.84%、98.83%和70.04%,借此可实现铁矾渣中有价金属Pb、Zn的回收。Effect of temperature on the compressive strength and phase change of pellets with coal and jarosite slag is studied under the mass ratio of jarosite slag,restoring coal and water of 100∶25∶35.The results show that the temperature has an important influence on the compressive strength and phase change of pellets with coal and jarosite slag.When the temperature is less than 700℃,the compressive strength of the pellet is comparatively low,and the volatile phase in it is decomposed to form intermediate phases of Fe2O3,PbSO4 and 6 MgO·Al2O3.When the temperature is over 700℃,the compressive strength of the pellet increases rapidly,and the volatile Pb,Zn,S and stable FeS,Mfe,CaS are produced by the reduction of new Fe2O3,PbSO4 and initial ZnFe2O4,CaSO4.The change of the pellet phase is accompanied by the change of its compressive strength and appearance color,as well as the shrinkage of its volume.The volatilization rate of Pb,Zn and S in pellets is 95.84%,98.83%and 70.04%respectively at 1200℃for 90 min under a constant temperature.By this way,the valuable metals Pb and Zn in the jarosite slag can be recovered.

关 键 词：温度 铁矾渣 内配煤球团 物相 回收 

分 类 号：X758[环境科学与工程—环境工程]