摘要
基于中国非焦煤资源丰富及天然气缺乏的国情和迫切发展绿色冶炼的现状,开发了煤基回转窑直接还原法的含锌渣尘协同处置新工艺研究。结果表明:在水分为14%,压力为20 MPa,内配无烟煤用量为9%,膨润土用量为1%时,生球块的成球率为83.4%,落下强度为6.00次/(0.5 m),抗压强度为32.6 N/个,爆裂指数为0.3%;干球块的干燥脱粉率为0.5%,落下强度为19次/(0.5 m),抗压强度为131.8 N/个。在马弗炉小试中,当还原温度1 200℃、还原时间100 min、内配煤用量9%、煤矿比2∶1、还原煤选用神府煤时,还原后球块的锌质量分数、铅质量分数和脱锌率、脱铅率分别为0.033%、0.016%和99.5%、90.2%。在回转窑扩大试验中,当还原温度1 150℃、还原时间100 min、内配煤用量9%、煤矿比1∶1、还原煤选用神府煤,还原后球块的锌质量分数、铅质量分数和脱锌率、脱铅率分别为0.049%、0.004%和99.8%、99.2%。
Based on the national conditions of abundant non-coking coal resources and lack of natural gas in China and the urgent development of green smelting, a new process of the direct reduction method of coal-based rotary kiln for the co-disposal of zinc-containing slag and dust was developed. The results show that: at the moisture of 14%, pressure of 20 MPa, the dosage of internal anthracite coal is 9% and the dosage of bentonite is 1%, the ball formation rate of raw ball lumps is 83.4%, the falling strength is 6.00 times/(0.5 m), the compressive strength is 32.6 N/pellet, and the bursting index is 0.3%;the dry de-dusting rate of dry lumps is 0.5%, the falling strength is 19 times/(0.5 m) with a compressive strength of 131.8 N/pellet. In the small test of muffle furnace, when the reduction temperature was 1 200 ℃, the reduction time was 100 min, the amount of internal coal was 9%, the coal mine ratio was 2∶1, and the reduction coal was selected from Shenfu coal, the zinc content, lead content and dezincification rate and lead removal rate of the reduced agglomerates were 0.033%, 0.016% and 99.5% and 90.2%, respectively. In the expanded test of rotary kiln, when the reduction temperature was 1 150 ℃, the reduction time was 100 min, the amount of internal coal was 9%, the coal ratio was 1∶1, and the reduction coal was Shenfu coal, the zinc content, lead content, dezincification rate and lead removal rate of the reduced lumps were 0.049%, 0.004%, 99.8% and 99.2%, respectively.
作者
詹若宁
郭正启
朱德庆
潘建
杨聪聪
黄学忠
ZHAN Ruoning;GUO Zhengqi;ZHU Deqing;PAN Jian;YANG Congcong;HUANG Xuezhong(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China;Guangxi Beigang New Material Co.,Ltd.,Beihai 536000,Guangxi,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2023年第2期219-231,共13页
Journal of Iron and Steel Research
基金
湖南省青年自然科学基金资助项目(2020JJ5726)。
关键词
含锌渣尘
回转窑
直接还原法
协同处置
zinc-containing slag and dust
rotary kiln
direct reduction
co-disposal
