煤炭转化2024，Vol.47Issue(1)：81-90,10.DOI:10.19726/j.cnki.ebcc.202401009
基于响应面法的煤矸石氯化焙烧除铁工艺参数优化
Optimization of process parameters for iron removal by chlorination roasting of coal gangue based on response surface methodology
摘要
Abstract
To address issues such as excessive chlorinating agent consumption,inaccurate roasting time and unsatisfactory iron removal ratios,CaCl2 was used as chlorinating agent to re-move iron from coal gangue in this paper.The single-factor experiments were conducted at vari-ous conditions,involving the chlorination roasting process at 600℃,700℃,800℃,900℃ and 1000℃,CaCl2 added amount(mass fraction)ranging from 5％,10％,15％,20％,to 25％,and roasting time ranging from 90 min,120 min,150 min,180 min,to 210 min,respectively.De-sign and optimization of all iron removal experiments using chlorination roasting of coal gangue were conducted with the assistance of Design-Expert 13.0.6 software.The reliability of the mod-el was validated through analysis of variance,contour analysis and response surface analysis,and the interaction relationships among various variables were also analyzed.The process parameters were optimized using the response surface optimization method,with the iron removal ratio ser-ving as the index.The results show that the interaction between roasting temperature and roast-ing time has the most pronounced effect,while the interaction between CaCl2 added amount and roasting time has the least significant impact.The order of significance for the influence factors from large to small is as follows:roasting temperature,CaCl2 added amount,roasting time.The iron removal ratio continues to increase with an increase in the roasting temperature.Given the product transforms into mullite when the roasting temperature surpasses 1000℃,it is required to keep the roasting temperature below 950℃.When the addition of CaCl2 reaches 15％,the best iron removal ratio is achieved.Exceeding this amount will reduce the iron removal ratio.When the roasting time reaches 180 min,the iron removal ratio approaches its peak value.Fur-ther extending the roasting time has little effect on the iron removal ratio.The process condi-tions,determined through the prediction and optimization of the response surface model,are as follows:roasting temperature at 915℃,CaCl2 added amount at 15％,and roasting time at 175 min.Under these conditions,the iron removal ratio reaches 95.23％,the actual experimental re-sults closely align with the predicted values.关键词
煤矸石/氯化焙烧/除铁率/响应曲面法/高岭土Key words
coal gangue/chlorination roasting/iron removal ratio/response surface method/kaolin分类
矿业与冶金引用本文复制引用
张雨涵,赵雪淞,李婷婷,王雪松,张婷..基于响应面法的煤矸石氯化焙烧除铁工艺参数优化[J].煤炭转化,2024,47(1):81-90,10.基金项目
2021年度辽宁省教育厅科学研究经费项目(LJKZ0328). （LJKZ0328）
